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In the run up to the 2015 Portuguese legislative election, various organisations carried out opinion polling to gauge voting intention in Portugal. Results of such polls are displayed in this article.
The date range for these opinion polls are from the previous general election, held on 5 June 2011, to the day the next election was held, on 4 October 2015.
 | Graphs are unavailable due to technical issues. There is more info on Phabricator and on MediaWiki.org. |
Poll results are listed in the table below in reverse chronological order, showing the most recent first. The highest percentage figure in each polling survey is displayed in bold, and the background shaded in the leading party's colour. In the instance that there is a tie, then no figure is shaded but both are displayed in bold. The lead column on the right shows the percentage-point difference between the two parties with the highest figures. Poll results use the date the survey's fieldwork was done, as opposed to the date of publication.
| Date | Polling Firm | Sample size |  [lower-alpha 1] |  |  |  |  |  |  | Others | Lead | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
 |  | |||||||||||
| 4 Oct 2015 | 2015 legislative election | 55.9% | 38.6 | 32.3 | 8.3 | 10.2 | 0.4 | 0.7 | 1.1 | 8.4 | 6.3 | |
| 4 Oct | Aximage [lower-alpha 2] | 40.2 | 32.3 | 8.9 | 9.4 | 9.2 | 7.9 | |||||
| 4 Oct | Eurosondagem [lower-alpha 2] | 46,626 | 38.3 | 31.3 | 7.9 | 9.3 | 13.2 | 7.0 | ||||
| 4 Oct | Intercampus [lower-alpha 2] | 17,726 | 39.2 | 31.7 | 8.5 | 10.2 | 10.4 | 7.5 | ||||
| 4 Oct | UCP–CESOP [lower-alpha 2] | 25,898 | 40.5 | 32.5 | 8.0 | 9.5 | 1.0 | 8.5 | 8.0 | |||
| Exit polls | ||||||||||||
| 26 Sep–1 Oct | Aximage | 1,387 | 39.1 | 32.5 | 9.2 | 9.0 | 10.2 | 6.6 | ||||
| 26–30 Sep | UCP–CESOP [lower-alpha 3] | 1,070 | 39.0 | 34.0 | 10.0 | 8.0 | 9.0 | 5.0 | ||||
| 22–30 Sep | Intercampus | 1,013 | 37.2 | 32.9 | 8.8 | 7.9 | 0.5 | 0.5 | 1.7 | 10.5 | 4.3 | |
| 29 Sep | Aximage [lower-alpha 3] | 200 | 40.3 | 31.8 | 8.1 | 7.1 | 12.7 | 8.5 | ||||
| 26–29 Sep | Intercampus [lower-alpha 3] | 1,008 | 38.4 | 32.1 | 8.4 | 7.9 | 13.2 | 6.3 | ||||
| 25–29 Sep | UCP–CESOP [lower-alpha 3] | 1,010 | 39.0 | 33.0 | 11.0 | 8.0 | 9.0 | 6.0 | ||||
| 24–29 Sep | Eurosondagem | 2,067 | 37.7 | 32.7 | 9.4 | 6.7 | 13.5 | 5.0 | ||||
| 22–29 Sep | Marktest | 1,607 | 41.0 | 28.6 | 9.3 | 8.7 | 0.8 | 0.7 | 10.9 | 12.4 | ||
| 28 Sep | Aximage [lower-alpha 3] | 200 | 39.0 | 32.1 | 8.2 | 7.1 | 13.6 | 6.9 | ||||
| 25–28 Sep | Intercampus [lower-alpha 3] | 1,008 | 38.8 | 31.6 | 8.2 | 7.9 | 13.5 | 7.2 | ||||
| 24–28 Sep | UCP–CESOP [lower-alpha 3] | 1,071 | 40.0 | 34.0 | 10.0 | 7.0 | 9.0 | 6.0 | ||||
| 27 Sep | Aximage [lower-alpha 3] | 199 | 38.4 | 31.8 | 8.4 | 7.1 | 14.3 | 6.6 | ||||
| 26–27 Sep | UCP–CESOP | 3,302 | 38.0 | 32.0 | 9.0 | 9.0 | 1.0 | 1.0 | 10.0 | 6.0 | ||
| 24–27 Sep | Intercampus [lower-alpha 3] | 1,025 | 37.9 | 32.1 | 9.1 | 7.5 | 13.4 | 5.8 | ||||
| 23–27 Sep | UCP–CESOP [lower-alpha 3] | 1,075 | 41.0 | 34.0 | 9.0 | 7.0 | 9.0 | 7.0 | ||||
| 26 Sep | Aximage [lower-alpha 3] | 200 | 37.9 | 32.3 | 8.6 | 7.0 | 14.2 | 5.6 | ||||
| 23–26 Sep | Intercampus [lower-alpha 3] | 1,025 | 38.1 | 33.0 | 9.0 | 6.7 | 13.2 | 5.1 | ||||
| 22–26 Sep | UCP–CESOP [lower-alpha 3] | 936 | 43.0 | 33.0 | 8.0 | 7.0 | 9.0 | 10.0 | ||||
| 25 Sep | Aximage [lower-alpha 3] | 37.7 | 32.3 | 30.0 | 5.4 | |||||||
| 22–25 Sep | Intercampus [lower-alpha 3] | 1,025 | 37.5 | 32.8 | 8.9 | 6.7 | 0.3 | 1.1 | 12.7 | 4.7 | ||
| 21–25 Sep | UCP–CESOP [lower-alpha 3] | 1,027 | 42.0 | 35.0 | 8.0 | 7.0 | 8.0 | 7.0 | ||||
| 24 Sep | Aximage [lower-alpha 3] | 37.7 | 32.6 | 29.7 | 5.1 | |||||||
| 21–24 Sep | Intercampus [lower-alpha 3] | 1,024 | 37.0 | 32.3 | 9.2 | 6.1 | 1.1 | 14.3 | 4.7 | |||
| 20–24 Sep | UCP–CESOP [lower-alpha 3] | 1,046 | 41.0 | 34.0 | 9.0 | 7.0 | 9.0 | 7.0 | ||||
| 18–24 Sep | Aximage | 710 | 37.9 | 32.0 | 9.0 | 7.1 | 14.0 | 5.9 | ||||
| 23 Sep | Aximage [lower-alpha 3] | 100 | 37.0 | 33.4 | 7.6 | 6.5 | 15.5 | 3.6 | ||||
| 20–23 Sep | Intercampus [lower-alpha 3] | 1,017 | 37.9 | 32.9 | 7.8 | 6.0 | 15.4 | 5.0 | ||||
| 19–23 Sep | UCP–CESOP [lower-alpha 3] | 891 | 40.0 | 35.0 | 9.0 | 8.0 | 8.0 | 5.0 | ||||
| 17–23 Sep | Eurosondagem | 1,548 | 35.5 | 36.0 | 10.1 | 5.0 | 1.5 | 1.9 | 10.0 | 0.5 | ||
| 22 Sep | Aximage [lower-alpha 3] | 103 | 36.3 | 34.3 | 7.9 | 6.2 | 15.3 | 2.0 | ||||
| 19–22 Sep | Intercampus [lower-alpha 3] | 1,007 | 38.9 | 34.1 | 8.3 | 4.8 | 13.9 | 4.8 | ||||
| 18–22 Sep | UCP–CESOP [lower-alpha 3] | 828 | 40.0 | 34.0 | 10.0 | 8.0 | 8.0 | 6.0 | ||||
| 21 Sep | Aximage [lower-alpha 3] | 35.9 | 34.7 | 29.4 | 1.2 | |||||||
| 18–21 Sep | Intercampus [lower-alpha 3] | 1,005 | 38.9 | 35.7 | 7.3 | 4.4 | 13.7 | 3.2 | ||||
| 17–21 Sep | UCP–CESOP [lower-alpha 3] | 738 | 40.0 | 35.0 | 8.0 | 7.0 | 10.0 | 5.0 | ||||
| 20 Sep | Aximage [lower-alpha 3] | 35.6 | 34.8 | 29.6 | 0.8 | |||||||
| 18–20 Sep | Intercampus [lower-alpha 3] | 733 | 40.1 | 37.1 | 6.3 | 4.0 | 12.5 | 3.0 | ||||
| 19 Sep | Aximage [lower-alpha 3] | 35.6 | 34.9 | 29.5 | 0.7 | |||||||
| 16–19 Sep | UCP–CESOP [lower-alpha 3] | 613 | 40.0 | 35.0 | 8.0 | 7.0 | 10.0 | 5.0 | ||||
| 18 Sep | Aximage [lower-alpha 3] | 35.5 | 35.1 | 8.4 | 5.7 | 15.3 | 0.4 | |||||
| 15–18 Sep | UCP–CESOP [lower-alpha 3] | 678 | 40.0 | 34.0 | 8.0 | 8.0 | 10.0 | 6.0 | ||||
| 14–17 Sep | UCP–CESOP [lower-alpha 3] | 647 | 41.0 | 34.0 | 7.0 | 8.0 | 10.0 | 7.0 | ||||
| 13–17 Sep | Aximage | 704 | 35.3 | 34.7 | 8.3 | 5.8 | 16.0 | 0.6 | ||||
| 11–16 Sep | Eurosondagem | 1,867 | 34.0 | 35.5 | 10.3 | 5.2 | 1.8 | 2.2 | 11.0 | 1.5 | ||
| 4–7 Sep | Aximage | 602 | 38.9 | 33.3 | 8.5 | 4.6 | 1.6 | 1.8 | 11.3 | 5.6 | ||
| 27 Aug–2 Sep | Eurosondagem | 1,040 | 35.0 | 36.0 | 10.4 | 4.6 | 1.7 | 2.3 | 10.0 | 1.0 | ||
| 29 Jul–4 Aug | Eurosondagem | 1,030 | 34.8 | 36.3 | 10.0 | 5.0 | 1.7 | 2.3 | 9.9 | 1.5 | ||
| 12–16 Jul | Aximage | 607 | 37.8 | 38.0 | 7.5 | 4.0 | 1.3 | 1.4 | 10.0 | 0.2 | ||
| 2–7 Jul | Eurosondagem | 1,025 | 34.6 | 36.7 | 10.2 | 4.8 | 1.9 | 2.5 | 9.3 | 2.1 | ||
| 26 Jun–4 Jul | Intercampus | 1,014 | 32.7 | 37.6 | 11.0 | 6.0 | 0.9 | 0.6 | 0.8 | 10.4 | 4.9 | |
| 15–21 Jun | Pitagórica | 523 | 36.4 | 33.5 | 10.1 | 3.6 | 1.3 | 1.6 | 13.5 | 2.9 | ||
| 13–16 Jun | UCP–CESOP | 1,048 | 38.0 | 37.0 | 10.0 | 8.0 | 7.0 | 1.0 | ||||
| 4–9 Jun | Eurosondagem | 1,030 | 33.3 | 36.9 | 10.5 | 4.5 | 2.0 | 2.7 | 10.1 | 3.6 | ||
| 31 May–4 Jun | Aximage | 598 | 37.2 | 38.0 | 7.5 | 4.0 | 1.2 | 2.1 | 10.0 | 0.8 | ||
| 7–12 May | Eurosondagem | 1,021 | 33.6 | 38.1 | 10.3 | 4.8 | 1.8 | 2.5 | 8.9 | 4.5 | ||
| 7–10 May | Aximage | 605 | 37.2 | 37.3 | 7.7 | 4.2 | 2.0 | 2.6 | 9.0 | 0.1 | ||
| 9–15 Apr | Eurosondagem | 1,025 | 26.7 | 8.0 | 37.5 | 10.2 | 4.3 | 2.0 | 2.8 | 8.5 | 10.8 | |
| 4–8 Apr | Aximage | 602 | 30.5 | 6.0 | 36.9 | 9.2 | 3.5 | 1.7 | 3.8 | 8.4 | 6.4 | |
| 5–10 Mar | Eurosondagem | 1,005 | 25.2 | 8.1 | 38.1 | 9.6 | 4.4 | 2.1 | 3.0 | 9.5 | 12.9 | |
| 3–6 Mar | Aximage | 600 | 28.9 | 6.1 | 36.1 | 10.7 | 4.0 | 1.6 | 4.4 | 8.2 | 7.2 | |
| 18–25 Feb | Eurosondagem [1] | 1,515 | 35.0 | 37.5 | 9.6 | 4.2 | 2.1 | 2.5 | 9.1 | 2.5 | ||
| 18–25 Feb | Eurosondagem [2] | 1,515 | 27.8 | 7.7 | 36.5 | 10.0 | 4.4 | 2.3 | 2.7 | 8.6 | 8.7 | |
| 5–11 Feb | Eurosondagem | 1,015 | 26.7 | 6.9 | 38.1 | 9.0 | 4.0 | 2.2 | 3.0 | 10.1 | 11.4 | |
| 4–8 Feb | Aximage | 608 | 30.2 | 5.3 | 36.7 | 9.2 | 3.8 | 2.5 | 5.2 | 7.1 | 6.5 | |
| 8–14 Jan | Eurosondagem | 1,010 | 26.9 | 7.9 | 37.9 | 9.3 | 3.5 | 2.0 | 2.5 | 10.0 | 11.0 | |
| 9–12 Jan | Aximage | 601 | 30.9 | 4.7 | 36.9 | 7.7 | 3.5 | 3.0 | 5.2 | 8.1 | 6.0 | |
| 2015 | ||||||||||||
| 4–10 Dec | Eurosondagem | 1,036 | 25.2 | 7.3 | 37.5 | 10.1 | 3.3 | 1.7 | 2.2 | 12.7 | 12.3 | |
| 1–4 Dec | Aximage | 607 | 31.0 | 5.1 | 37.4 | 7.6 | 5.2 | 2.9 | 4.1 | 6.7 | 6.4 | |
| 6–11 Nov | Eurosondagem | 1,022 | 25.3 | 7.7 | 36.9 | 10.4 | 3.6 | 1.0 | 1.5 | 13.6 | 10.6 | |
| 7–10 Nov | Aximage | 603 | 31.1 | 5.2 | 38.5 | 7.9 | 6.0 | 2.1 | 2.1 | 7.1 | 7.4 | |
| 11–13 Oct | UCP–CESOP | 1,064 | 28.0 | 4.0 | 45.0 | 10.0 | 4.0 | 9.0 | 17.0 | |||
| 2–7 Oct | Eurosondagem | 1,021 | 26.2 | 8.0 | 34.8 | 10.5 | 4.0 | 2.1 | 1.6 | 12.8 | 8.6 | |
| 1–4 Oct | Aximage | 609 | 27.4 | 6.1 | 40.2 | 9.2 | 7.7 | 1.1 | 8.3 | 12.8 | ||
| 4–9 Sep | Eurosondagem | 1,011 | 28.0 | 7.5 | 33.0 | 10.7 | 4.3 | 3.3 | 1.7 | Did not exist | 11.5 | 5.0 |
| 31 Aug–3 Sep | Aximage | 602 | 28.6 | 8.4 | 30.9 | 11.9 | 5.7 | 14.5 | 2.3 | |||
| 31 Jul–6 Aug | Eurosondagem | 1,033 | 27.8 | 7.0 | 32.1 | 11.0 | 4.5 | 3.6 | 1.9 | 12.1 | 4.3 | |
| 25–31 Jul | Pitagórica [lower-alpha 4] | 504 | 26.8 | 5.1 | 33.9 | 13.0 | 3.1 | 3.1 | 15.0 | 7.1 | ||
| 25–31 Jul | Pitagórica [lower-alpha 5] | 504 | 28.1 | 6.9 | 30.0 | 12.7 | 4.2 | 3.5 | 14.6 | 1.9 | ||
| 3–9 Jul | Eurosondagem | 1,014 | 27.5 | 6.6 | 32.5 | 11.1 | 4.9 | 4.0 | 2.0 | 11.4 | 5.0 | |
| 4–7 Jul | Aximage | 593 | 27.2 | 8.3 | 31.0 | 10.7 | 6.9 | 15.9 | 3.8 | |||
| 2–5 Jun | Eurosondagem | 1,025 | 26.1 | 6.9 | 33.0 | 11.8 | 4.8 | 4.6 | 2.0 | 10.8 | 6.9 | |
| 1–4 Jun | Aximage | 608 | 24.9 | 7.8 | 32.0 | 13.0 | 6.0 | 12.7 | 7.1 | |||
| 30 May–1 Jun | Pitagórica [lower-alpha 4] | 506 | 27.5 | 6.2 | 35.2 | 13.6 | 4.4 | 3.3 | 9.8 | 7.7 | ||
| 30 May–1 Jun | Pitagórica [lower-alpha 5] | 506 | 28.0 | 6.3 | 30.6 | 14.4 | 4.8 | 3.7 | 12.2 | 2.6 | ||
| 25 May 2014 | 2014 EP elections | 33.8% | 27.7 | 31.5 | 12.7 | 4.6 | 7.1 | 2.2 | 14.3 | 3.8 | ||
| 19–24 May | Intercampus | 4,004 | 28.7 | 2.4 | 29.1 | 11.4 | 5.4 | 23.0 | 0.4 | |||
| 14–22 May | Aximage | 1,507 | 29.0 | 7.3 | 36.2 | 10.3 | 6.5 | 10.7 | 7.2 | |||
| 1–7 May | Eurosondagem | 1,005 | 26.9 | 8.1 | 38.0 | 10.4 | 6.6 | 10.0 | 11.1 | |||
| 2–5 May | Aximage | 605 | 30.5 | 6.8 | 36.2 | 10.5 | 6.6 | 9.4 | 5.7 | |||
| 12–14 Apr | UCP–CESOP | 1,117 | 30.0 | 4.0 | 36.0 | 12.0 | 7.0 | 11.0 | 6.0 | |||
| 9–12 Apr | Aximage | 613 | 31.5 | 6.1 | 36.1 | 11.8 | 6.4 | 8.1 | 4.6 | |||
| 3–9 Apr | Eurosondagem | 1,011 | 25.2 | 8.1 | 37.3 | 10.9 | 7.5 | 11.0 | 12.1 | |||
| 25–29 Mar | Pitagórica | 506 | 27.6 | 7.6 | 39.0 | 10.3 | 6.9 | 8.6 | 11.4 | |||
| 6–12 Mar | Eurosondagem | 1,021 | 26.6 | 8.4 | 36.6 | 11.1 | 6.9 | 10.4 | 10.0 | |||
| 8–11 Mar | Aximage | 587 | 33.3 | 5.7 | 36.8 | 11.7 | 5.4 | 7.1 | 3.5 | |||
| 24 Feb–1 Mar | Pitagórica | 506 | 28.4 | 8.7 | 37.2 | 10.5 | 4.9 | 10.2 | 8.8 | |||
| 9–12 Feb | Aximage | 604 | 31.4 | 5.4 | 38.1 | 9.7 | 5.7 | 9.7 | 6.7 | |||
| 6–12 Feb | Eurosondagem | 1,025 | 25.6 | 7.7 | 36.9 | 10.5 | 7.0 | 12.3 | 11.3 | |||
| 20–24 Jan | Pitagórica | 506 | 25.8 | 7.8 | 37.8 | 11.4 | 6.6 | Did not exist | 10.6 | 12.0 | ||
| 9–15 Jan | Eurosondagem | 1,010 | 25.0 | 8.0 | 37.5 | 10.4 | 6.6 | 12.5 | 12.5 | |||
| 7–10 Jan | Aximage | 601 | 30.6 | 5.8 | 38.5 | 9.2 | 6.3 | 9.6 | 7.9 | |||
| 2014 | ||||||||||||
| 10–15 Dec | Pitagórica | 503 | 25.7 | 9.0 | 36.7 | 11.2 | 6.7 | Was not polled | Did not exist | Did not exist | 10.7 | 11.0 |
| 5–10 Dec | Eurosondagem | 1,035 | 26.5 | 8.5 | 36.5 | 10.0 | 6.5 | 12.0 | 10.0 | |||
| 6–9 Dec | Aximage | 609 | 29.6 | 8.3 | 36.4 | 9.7 | 6.3 | 9.7 | 6.8 | |||
| 19–21 Nov | Marktest | 800 | 25.6 | 1.5 | 35.6 | 17.2 | 6.5 | 13.6 | 10.0 | |||
| 6–9 Nov | Aximage | 602 | 28.4 | 9.4 | 36.9 | 10.3 | 6.8 | 8.2 | 8.5 | |||
| 30 Oct–5 Nov | Eurosondagem | 1,005 | 25.6 | 8.4 | 37.3 | 11.1 | 5.9 | 11.7 | 11.7 | |||
| 22–25 Oct | Marktest | 803 | 26.2 | 2.3 | 35.8 | 16.6 | 5.5 | 13.6 | 9.6 | |||
| 19–22 Oct | Aximage | 607 | 26.9 | 12.1 | 30.2 | 12.4 | 7.2 | 11.2 | 3.3 | |||
| 14–19 Oct | Pitagórica | 506 | 23.7 | 8.6 | 36.7 | 13.2 | 6.6 | 11.2 | 13.0 | |||
| 2–8 Oct | Eurosondagem | 1,010 | 26.9 | 8.6 | 36.5 | 12.1 | 5.9 | 10.0 | 9.6 | |||
| 29 Sep 2013 | 2013 local elections | 52.6% | 31.4 | 3.4 | 36.7 | 11.1 | 2.4 | 0.1 | 14.8 | 5.3 | ||
| 28–29 Sep | Intercampus | 1,000 | 27.0 | 4.0 | 39.0 | 11.0 | 7.0 | Was not polled | 12.0 | 12.0 | ||
| 26–29 Sep | Aximage | 609 | 30.2 | 10.3 | 34.5 | 10.4 | 5.6 | 9.0 | 4.3 | |||
| 17–19 Sep | Marktest | 801 | 28.5 | 2.5 | 36.6 | 11.5 | 7.3 | 13.6 | 8.1 | |||
| 5–11 Sep | Eurosondagem | 1,038 | 26.5 | 6.5 | 38.0 | 12.5 | 6.5 | 10.0 | 11.5 | |||
| 1–3 Sep | Aximage | 609 | 28.0 | 7.6 | 35.3 | 11.8 | 6.6 | 10.7 | 7.3 | |||
| 25–31 Jul | Eurosondagem | 1,020 | 24.4 | 7.7 | 37.4 | 12.5 | 7.5 | 10.5 | 13.0 | |||
| 27–29 Jul | Universidade Católica | 1,096 | 32.0 | 3.0 | 35.0 | 11.0 | 7.0 | 12.0 | 3.0 | |||
| 24–28 Jul | Pitagórica | 507 | 24.1 | 8.1 | 34.6 | 13.1 | 8.7 | 11.4 | 10.5 | |||
| 16–18 Jul | Marktest | 804 | 27.6 | 5.2 | 34.2 | 10.8 | 8.6 | 13.6 | 6.6 | |||
| 8–11 Jul | Aximage | 603 | 28.0 | 5.8 | 37.4 | 10.5 | 6.7 | 11.6 | 9.4 | |||
| 5–10 Jul | Eurosondagem | 1,007 | 25.0 | 8.0 | 37.0 | 12.0 | 8.0 | 10.0 | 12.0 | |||
| 28 Jun–2 Jul | Pitagórica | 503 | 23.7 | 9.1 | 33.9 | 13.2 | 8.9 | 11.2 | 10.2 | |||
| 4–7 Jun | Aximage | 599 | 23.2 | 9.4 | 35.5 | 11.5 | 8.4 | 12.0 | 12.3 | |||
| 30 May–4 Jun | Eurosondagem | 1,028 | 24.8 | 7.7 | 36.9 | 13.0 | 8.0 | 9.6 | 12.1 | |||
| 27–30 May | Marktest | 802 | 25.0 | 5.6 | 34.6 | 13.1 | 8.2 | 13.5 | 9.6 | |||
| 23–28 May | Pitagórica | 506 | 25.4 | 9.5 | 32.7 | 12.6 | 9.4 | 10.4 | 7.3 | |||
| 7–10 May | Aximage | 604 | 26.2 | 9.5 | 35.5 | 9.4 | 6.9 | 12.5 | 9.3 | |||
| 2–8 May | Eurosondagem | 1,009 | 25.9 | 8.4 | 36.0 | 12.1 | 8.8 | 8.8 | 10.1 | |||
| 17–20 Apr | Pitagórica | 503 | 26.9 | 12.0 | 28.6 | 12.8 | 8.7 | 11.0 | 1.7 | |||
| 5–10 Apr | Eurosondagem | 1,025 | 26.5 | 8.5 | 35.0 | 12.5 | 8.5 | 9.0 | 8.5 | |||
| 1–4 Apr | Aximage | 601 | 25.3 | 9.4 | 32.6 | 12.0 | 7.8 | 12.9 | 7.3 | |||
| 19–24 Mar | Pitagórica | 503 | 25.7 | 10.6 | 36.7 | 11.2 | 7.9 | 7.9 | 11.0 | |||
| 9–11 Mar | Universidade Católica | 949 | 28.0 | 5.0 | 31.0 | 12.0 | 8.0 | 16.0 | 3.0 | |||
| 4–6 Mar | Aximage | 607 | 25.1 | 12.1 | 31.6 | 12.2 | 7.1 | 11.9 | 6.5 | |||
| 28 Feb–5 Mar | Eurosondagem | 1,022 | 27.0 | 9.0 | 35.2 | 12.1 | 8.0 | 8.7 | 8.2 | |||
| 20–24 Feb | Pitagórica | 503 | 26.4 | 10.7 | 35.1 | 10.7 | 8.6 | 8.5 | 8.7 | |||
| 5–8 Feb | Aximage | 602 | 29.1 | 8.7 | 32.0 | 11.5 | 6.3 | 12.4 | 2.9 | |||
| 30 Jan–5 Feb | Eurosondagem | 1,011 | 27.6 | 9.5 | 34.1 | 11.6 | 8.4 | 8.8 | 6.5 | |||
| 22–25 Jan | Pitagórica | 504 | 28.6 | 10.2 | 33.8 | 12.0 | 8.0 | 7.4 | 5.2 | |||
| 15–21 Jan | Marktest | 803 | 27.9 | 5.2 | 32.6 | 12.4 | 13.3 | 8.6 | 4.7 | |||
| 6–9 Jan | Aximage | 603 | 26.3 | 10.3 | 32.9 | 11.8 | 7.4 | 11.3 | 6.6 | |||
| 3–8 Jan | Eurosondagem | 1,010 | 26.9 | 9.6 | 34.3 | 10.3 | 8.8 | 10.1 | 7.4 | |||
| 2013 | ||||||||||||
| 13–18 Dec | Pitagórica | 511 | 29.0 | 11.4 | 34.6 | 11.2 | 8.4 | Was not polled | Did not exist | Did not exist | 5.4 | 5.6 |
| 5–11 Dec | Eurosondagem | 1,034 | 26.4 | 10.0 | 34.0 | 11.0 | 9.0 | 9.6 | 7.6 | |||
| 4–7 Dec | Aximage | 609 | 26.8 | 8.0 | 32.9 | 11.0 | 7.6 | 13.7 | 6.1 | |||
| 9–16 Nov | Pitagórica | 505 | 26.4 | 9.8 | 36.2 | 9.8 | 7.5 | 10.2 | 9.8 | |||
| 7–13 Nov | Eurosondagem | 1,033 | 26.9 | 10.1 | 35.0 | 10.0 | 9.5 | 8.5 | 8.1 | |||
| 30 Oct–6 Nov | Aximage | 602 | 26.3 | 7.9 | 32.1 | 9.6 | 7.5 | 16.6 | 5.8 | |||
| 8–13 Oct | Pitagórica | 503 | 29.5 | 8.3 | 34.1 | 9.1 | 7.2 | 11.8 | 4.6 | |||
| 4–9 Oct | Eurosondagem | 1,021 | 30.0 | 10.0 | 34.8 | 9.5 | 7.7 | 8.0 | 4.8 | |||
| 1–4 Oct | Aximage | 604 | 24.9 | 7.9 | 33.7 | 9.5 | 7.0 | 17.0 | 8.8 | |||
| 17–20 Sep | Marktest | 805 | 20.2 | 5.2 | 29.6 | 10.1 | 8.6 | 26.3 | 9.4 | |||
| 15–17 Sep | UCP–CESOP | 1,132 | 24.0 | 7.0 | 31.0 | 13.0 | 11.0 | 14.0 | 7.0 | |||
| 10–13 Sep | Eurosondagem | 1,037 | 33.0 | 10.3 | 33.7 | 9.3 | 7.0 | 6.7 | 0.7 | |||
| 3–6 Sep | Aximage | 600 | 33.3 | 7.1 | 35.4 | 7.7 | 5.3 | 11.2 | 2.1 | |||
| 9–14 Aug | Eurosondagem | 1,011 | 34.1 | 10.1 | 33.0 | 8.8 | 6.6 | 7.4 | 1.1 | |||
| 17–20 Jul | Marktest | 803 | 26.7 | 4.4 | 25.8 | 9.9 | 6.9 | 26.3 | 0.9 | |||
| 5–10 Jul | Eurosondagem | 1,036 | 34.6 | 10.1 | 32.5 | 8.7 | 6.9 | 7.2 | 2.1 | |||
| 2–4 Jul | Aximage | 600 | 35.0 | 7.9 | 30.8 | 7.8 | 5.3 | 13.2 | 4.2 | |||
| 19–22 Jun | Marktest | 800 | 31.3 | 2.8 | 29.2 | 9.5 | 5.4 | 21.8 | 2.1 | |||
| 7–12 Jun | Eurosondagem | 1,022 | 34.3 | 11.6 | 32.1 | 9.0 | 6.9 | 6.1 | 2.2 | |||
| 4–6 Jun | Aximage | 600 | 36.6 | 7.5 | 28.2 | 10.1 | 5.0 | 12.6 | 8.4 | |||
| 26–28 May | UCP–CESOP | 1,366 | 36.0 | 6.0 | 33.0 | 9.0 | 9.0 | 7.0 | 3.0 | |||
| 22–24 May | Marktest | 807 | 30.4 | 3.5 | 29.1 | 9.6 | 8.5 | 18.9 | 1.3 | |||
| 10–15 May | Eurosondagem | 1,011 | 34.8 | 11.6 | 31.2 | 8.8 | 6.0 | 7.6 | 3.6 | |||
| 2–5 May | Aximage | 600 | 36.3 | 6.2 | 28.9 | 9.7 | 4.3 | 14.6 | 7.4 | |||
| 17–21 Apr | Marktest | 810 | 31.4 | 3.6 | 25.4 | 10.2 | 7.8 | 21.6 | 6.0 | |||
| 11–17 Apr | Eurosondagem | 1,036 | 35.3 | 10.7 | 30.5 | 9.1 | 6.4 | 8.0 | 4.8 | |||
| 3–5 Apr | Aximage | 600 | 35.0 | 8.7 | 27.8 | 10.1 | 4.0 | 14.4 | 7.2 | |||
| 19–23 Mar | Marktest | 802 | 36.5 | 5.2 | 20.5 | 7.6 | 6.3 | 23.9 | 16.0 | |||
| 8–13 Mar | Eurosondagem | 1,021 | 36.0 | 12.0 | 29.6 | 8.5 | 6.9 | 7.0 | 6.4 | |||
| 5–7 Mar | Aximage | 600 | 36.2 | 6.5 | 31.4 | 9.2 | 2.9 | 13.8 | 4.8 | |||
| 14–22 Feb | Marktest | 800 | 30.2 | 3.9 | 25.9 | 9.3 | 6.0 | 24.7 | 4.3 | |||
| 2–7 Feb | Eurosondagem | 1,010 | 35.0 | 11.7 | 30.0 | 8.5 | 6.5 | 8.3 | 5.0 | |||
| 1–4 Feb | Aximage | 600 | 37.5 | 8.9 | 30.3 | 8.8 | 2.8 | 11.7 | 7.2 | |||
| 17–22 Jan | Marktest | 800 | 37.6 | 4.0 | 25.2 | 6.1 | 7.7 | 19.4 | 12.4 | |||
| 5–10 Jan | Eurosondagem | 1,064 | 36.4 | 12.1 | 30.3 | 7.7 | 6.4 | 7.1 | 6.1 | |||
| 3–6 Jan | Aximage | 600 | 37.9 | 9.3 | 30.0 | 10.7 | 2.5 | 9.6 | 7.9 | |||
| 2012 | ||||||||||||
| 7–13 Dec | Eurosondagem | 1,033 | 36.0 | 12.5 | 30.0 | 8.8 | 6.4 | Was not polled | Did not exist | Did not exist | 6.3 | 6.0 |
| 5–8 Dec | Aximage | 600 | 39.5 | 9.1 | 27.7 | 11.3 | 3.3 | 9.1 | 11.8 | |||
| 15–19 Nov | Marktest | 804 | 45.4 | 5.0 | 19.7 | 7.9 | 4.1 | 17.9 | 25.7 | |||
| 10–15 Nov | Eurosondagem | 1,025 | 36.3 | 12.1 | 29.6 | 9.0 | 6.1 | 6.9 | 6.7 | |||
| 7–10 Nov | Aximage | 600 | 41.2 | 9.5 | 26.8 | 10.6 | 3.5 | 8.4 | 14.4 | |||
| 20–25 Oct | Eurosondagem | 1,032 | 36.9 | 12.5 | 29.2 | 8.8 | 6.3 | 6.3 | 7.7 | |||
| 18–22 Oct | Marktest | 809 | 41.6 | 5.3 | 19.7 | 10.5 | 4.2 | 18.7 | 21.9 | |||
| 3–5 Oct | Aximage | 600 | 41.1 | 10.2 | 26.0 | 7.6 | 5.0 | 10.1 | 15.1 | |||
| 22–27 Sep | Eurosondagem | 1,036 | 39.3 | 12.1 | 28.2 | 8.2 | 5.3 | 6.9 | 11.1 | |||
| 20–23 Sep | Marktest | 804 | 47.1 | 6.8 | 23.3 | 4.0 | 2.7 | 16.1 | 23.8 | |||
| 10–11 Sep | UCP–CESOP | 1,457 | 43.0 | 6.0 | 33.0 | 7.0 | 6.0 | 5.0 | 10.0 | |||
| 7–10 Sep | Aximage | 600 | 40.9 | 7.1 | 25.1 | 9.0 | 3.2 | 14.7 | 15.8 | |||
| 26–30 Aug | Eurosondagem | 1,025 | 39.6 | 12.5 | 26.9 | 8.4 | 5.5 | 7.1 | 12.7 | |||
| 14–19 Jul | Eurosondagem | 1,022 | 40.0 | 13.1 | 26.3 | 8.0 | 5.1 | 7.5 | 13.7 | |||
| 5–8 Jul | Aximage | 600 | 42.0 | 10.3 | 24.0 | 7.5 | 5.9 | 10.3 | 18.0 | |||
| 26–28 Jun | Eurosondagem | 1,010 | 40.8 | 13.6 | 25.0 | 7.7 | 4.8 | 8.1 | 15.8 | |||
| 5 Jun 2011 | 2011 legislative election | 58.0% | 38.7 | 11.7 | 28.0 | 7.9 | 5.2 | 0.4 | 7.7 | 10.6 | ||
Opinion polls showing seat projections are displayed in the table below. The highest seat figures in each polling survey have their background shaded in the leading party's colour. In the instance that there is a tie, then no figure is shaded. 116 seats are required for an absolute majority in the Assembly of the Republic.
| Date | Polling Firm | [lower-alpha 1] | | | | | | | Others | |
|---|---|---|---|---|---|---|---|---|---|---|
| | | |||||||||
| 4 Oct 2015 | 2015 legislative election | 107 | 86 | 17 | 19 | 0 | 0 | 0 | 1 | |
| 4 Oct | Eurosondagem | 100−108 | 84−90 | 15−18 | 16−19 | 0 | 0−1 | 0−1 | 0 | |
| 4 Oct | Intercampus | 106−118 | 77−89 | 12−20 | 15−23 | 0 | 0−1 | 0 | 0−2 | |
| 4 Oct | UCP–CESOP | 108−116 | 80−88 | 13−17 | 16−20 | 0 | 0−1 | 0 | 0 | |
| Exit polls | ||||||||||
| 24–29 Sep | Eurosondagem | 102−108 | 89−95 | 19−21 | 10−15 | 0 | 0 | 0 | 0−1 | |
| 26–27 Sep | UCP–CESOP | 99−114 | 78−95 | 15−20 | 12−17 | 0 | 0−1 | 0 | 0−1 | |
| 22–26 Sep | UCP–CESOP | 117 | 89 | 16 | 8 | 0 | 0 | 1 | 0 | |
| 21–25 Sep | UCP–CESOP | 113 | 91 | 16 | 8 | 0 | 1 | 1 | 0 | |
| 17–23 Sep | Eurosondagem | 100−103 | 97−102 | 20−22 | 5−7 | 0 | 1 | 0−2 | 0 | |
| 11–16 Sep | Eurosondagem | 99−102 | 95−101 | 20−22 | 6−9 | 0 | 1 | 2 | 0 | |
| 7–12 May | Eurosondagem | 97 | 103 | 21 | 6 | 0 | 1 | 2 | 0 | |
| 18–25 Feb | Eurosondagem [1] | 98−103 | 100−105 | 18−21 | 4 | 0 | 1−2 | 2 | 0 | |
| 18–25 Feb | Eurosondagem [2] | 78−87 | 13−17 | 99−105 | 20−21 | 4−6 | 0 | 2−3 | 2−3 | 0 |
| 2015 | ||||||||||
| 5 Jun 2011 | 2011 legislative election | 108 | 24 | 74 | 16 | 8 | 0 | 0 | ||
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