Opinion polling for the 2019 Portuguese legislative election

In the run up to the 2019 Portuguese legislative election (to be held on 6 October 2019), various organisations carry 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 legislative election, held on 4 October 2015, to the present day.

Nationwide polling[]

Graphical summary[]

Polling[]

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.

  Exit poll

Polling firm/Link	Fieldwork date	Sample size	Turnout											O	Lead
2019 Legislative Election	6 Oct 2019	N/A	48.6	27.8 79	36.4 108	9.5 19	4.2 5	6.3 12	3.3 4	1.1 1	1.3 1	0.8 0	1.3 1	8.0	8.6
UCP–CESOP	6 Oct 2019	20,532	51–56	27–31 74/82	34–39 104/112	9–12 19/23	3–5 4/6	6–8 9/14	3–5 4/6	1–2 1	1–2 1/2	0–1 0/1	1–2 0/1	–	7–8
ICS/ISCTE	6 Oct 2019	15,051	48.5– 52.5	24.2– 28.2 72/82	36.0– 40.0 105/117	8.9– 11.9 17/24	2.4– 5.0 2/8	4.7– 7.3 5/13	2.5– 4.5 2/6	0.5– 2.5 1/2	0.6– 2.6 1/3	–	0.4– 2.4 0/1	–	11.8
Intercampus	6 Oct 2019	22,303	52–56	24–30 75/85	33–39 102/114	7–11 16/22	2–5 3/7	4–8 8/14	2–5 4/8	? 1	? 2	–	? 1	–	9
Pitagórica	6 Oct 2019	26,422	52.5– 56.6	24.6– 28.6 68/78	34.5– 38.5 100/112	7.7– 11.7 20/26	2.9– 4.9 3/7	6.0– 8.0 10/14	2.7– 4.7 3/5	0.1– 2.1 0/1	0.9– 2.9 0/2	–	0.6– 2.6 0/1	–	9.9
Pitagórica[a]	30 Sep–3 Oct 2019	600	?	27.8	37.2	9.2	4.6	6.6	4.8	0.9	0.9	1.1	1.8	5.3	9.4
Aximage	26 Sep–2 Oct 2019	2,171	?	26.8 72	36.5 102	10.7 25	4.9 9	6.6 14	3.8 6	1.3 1	1.1 0	–	1.3 1	7.0 0	9.7
Pitagórica	17 Sep–2 Oct 2019	2,400	?	28.8 79/83	37.3 101/104	9.2 17/20	3.9 7/10	6.6 9/12	4.4 4/5	0.9 0/1	0.9 0/1	1.5 0	1.5 0	5.0 0	8.5
Pitagórica[a]	28 Sep–1 Oct 2019	600	?	28.5	37.4	8.9	4.0	7.4	3.8	0.8	0.4	1.1	1.5	6.2	8.9
Intercampus	26 Sep–1 Oct 2019	1,000	?	26.1 77	35.0 104	8.7 17	4.5 7	8.0 16	5.6 9	–	–	–	–	12.1 0	8.9
Eurosondagem	25 Sep–1 Oct 2019	2,071	?	25.5 68/76	38.8 109/117	9.6 17/19	5.0 6/8	7.1 13/14	4.0 5/6	–	–	–	–	10.0 0/2	13.3
Pitagórica[a]	27–30 Sep 2019	600	?	28.6	35.6	9.5	4.2	7.8	2.9	1.5	1.1	1.1	1.3	6.5	7.0
UCP–CESOP	26–29 Sep 2019	3,226	?	30 79/87	37 97/107	10 18/24	5 7/11	6 8/13	3 2/4	1 0/1	1 0/1	1 0	1 0	6 0	7
Pitagórica[a]	26–29 Sep 2019	600	?	28.9	35.3	9.1	4.5	7.8	3.2	1.5	1.3	0.6	1.1	6.7	6.4
ICS/ISCTE	23–29 Sep 2019	1,330	?	28 73/83	38 104/114	10 16/24	5 5/10	6 9/15	3 2/5	0.5 0	0.2 0	0.3 0	0.4 0	7 0	10
Pitagórica[a]	25–28 Sep 2019	600	?	27.7	37.7	10.0	4.4	6.3	3.1	1.3	1.1	0.7	1.1	6.8	10.0
Pitagórica[a]	24–27 Sep 2019	600	?	26.4	37.1	10.4	3.6	6.4	3.1	1.3	2.0	0.7	1.1	7.8	10.7
Pitagórica[a]	23–26 Sep 2019	600	?	26.6	37.8	10.1	4.0	5.1	3.6	1.1	1.6	0.7	1.1	8.3	11.2
Pitagórica[a]	22–25 Sep 2019	600	?	26.8	38.3	10.6	4.4	5.3	3.3	1.1	1.3	0.7	0.7	7.5	11.5
Aximage	21–25 Sep 2019	?	?	25.2	37.4	11.0	5.1	6.8	3.6	1.6	1.2	–	1.5	6.6	12.2
Pitagórica[a]	21–24 Sep 2019	600	?	27.0	36.4	10.6	4.4	6.9	3.0	1.2	1.8	0.5	0.7	7.6	9.4
Pitagórica[a]	20–23 Sep 2019	600	?	28.5	36.0	10.5	4.4	6.8	3.7	0.9	1.2	0.5	0.5	7.0	7.5
Pitagórica[a]	19–22 Sep 2019	600	?	27.7	37.6	10.4	4.7	7.6	3.3	0.5	0.9	0.7	0.2	6.3	9.9
Pitagórica[a]	18–21 Sep 2019	600	?	26.8	38.7	9.7	5.5	6.9	3.1	0.2	1.0	1.0	0.5	6.7	11.9
Pitagórica[a]	17–20 Sep 2019	600	?	26.6	40.6	8.8	5.2	6.8	3.6	0.2	0.5	1.1	0.5	6.1	14.0
Multidados	9–13 Sep 2019	800	?	25.1	37.7	12.5	5.2	5.9	5.0	–	–	–	–	9.0	12.6
Pitagórica	9–12 Sep 2019	605	?	23.3	39.2	10.0	5.6	7.7	3.2	0.9	–	1.5	–	8.6	15.9
Eurosondagem	7–12 Sep 2019	2,048	?	23.3 64/70	38.3 112/118	9.5 17/19	5.5 8	7.1 13/15	4.5 6	–	–	–	–	11.8 1/3	15.0
Intercampus	2–11 Sep 2019	801	?	23.6 67	37.9 114	9.8 18	6.3 9	8.6 16	5.2 6	–	–	–	–	8.6 0	14.3
Aximage	1–8 Sep 2019	985	65.5	20.6	38.4	10.2	4.6	5.4	4.9	–	–	–	–	15.9	17.8
Eurosondagem	1–5 Sep 2019	1,022	?	23.3	38.1	9.0	6.0	6.9	4.4	–	–	1.7	–	10.6	14.8
ICS/ISCTE	24 Aug–5 Sep 2019	801	?	23	42	9	5	6	4	0	0	0	0	11.0	19
Pitagórica	12–24 Aug 2019	1,525	?	20.4	43.6	10.0	4.9	6.6	3.2	0.6	1.3	1.5	–	7.9	23.2
Multidados	18–28 Jul 2019	800	?	20.3	35.5	14.7	3.3	5.6	7.9	–	–	–	–	12.7	15.2
Aximage	20–27 Jul 2019	1,385	61.7	20.7	38.1	10.0	5.0	6.7	5.0	–	–	–	–	14.5	17.4
Aximage	12–15 Jul 2019	601	?	23.6	37.5	9.4	4.9	6.8	4.0	–	–	–	–	13.8	13.9
Pitagórica	8–14 Jul 2019	800	?	21.6	43.2	9.2	6.0	6.8	3.6	–	–	1.2	0.8	7.6	21.6
Eurosondagem	7–11 Jul 2019	1,011	?	23.6	37.3	9.0	6.4	6.8	4.3	–	–	1.5	–	11.1	13.7
ICS/ISCTE	15–27 Jun 2019	801	?	23	38	11	5	8	4	0	0	0	1	10	15
Aximage	13–19 Jun 2019	605	64.1	23.1	35.6	9.0	6.6	7.0	4.2	–	–	0.8	–	13.7	12.5
Eurosondagem	2–6 Jun 2019	1,008	?	24.0	37.1	9.1	6.0	6.3	4.8	–	–	1.9	–	10.8	13.1
2019 EP Elections	26 May 2019	N/A	30.7	21.9	33.4	9.8	6.2	6.9	5.1	1.8	0.9	1.9	1.5	10.6	11.5
UCP–CESOP	26 May 2019	4,589	?	25	39	9	6	8	4	–	–	1	–	8	14
Aximage	16–20 May 2019	622	63.7	25.7	36.5	9.1	6.9	7.3	1.5	–	–	1.3	–	11.7	10.8
UCP–CESOP	16–19 May 2019	1,882	?	28	39	9	7	8	3	–	–	1	–	5	11
Pitagórica	10–19 May 2019	605	?	22.5	40.4	8.2	6.1	6.5	3.6	–	–	1.5	–	11.1	17.9
Aximage	3–8 May 2019	601	63.3	27.6	35.4	7.9	7.4	7.2	1.6	–	–	1.4	–	11.5	7.8
Pitagórica	3–13 Apr 2019	605	?	25.6	37.2	8.3	6.5	6.5	2.8	–	–	1.8	–	11.4	11.6
Eurosondagem	7–11 Apr 2019	1,019	?	25.0	36.9	7.8	8.4	7.3	2.5	–	–	3.5	[b]	8.6	11.9
Aximage	30 Mar–1 Apr 2019	602	63.6	27.3	34.6	8.5	8.5	7.0	2.2	–	–	1.6		10.3	7.3
Eurosondagem	10–14 Mar 2019	1,020	?	25.2	37.3	8.1	8.5	7.1	2.4	–	–	3.3		8.1	12.1
Aximage	9–13 Mar 2019	600	?	23.9	36.3	9.2	9.7	6.8	2.2	–	–	1.8		10.1	12.4
ICS/ISCTE	9–21 Feb 2019	801	?	25	37	8	8	8	3	1	0	2		8	12
Aximage	5–10 Feb 2019	602	66.3	24.4	36.4	8.9	9.3	6.3	2.5	–	–	1.6		10.6	12.0
Eurosondagem	2–9 Jan 2019	1,010	?	24.8	40.0	7.6	7.1	7.1	1.9	–	–	4.0		7.5	15.2
Aximage	4–7 Jan 2019	608	65.4	24.1	37.7	8.8	9.4	7.2	3.5	–	–	1.2		8.1	13.6
Aximage	7–11 Dec 2018	602	66.6	24.7	37.0	10.0	8.7	6.3	–	–	–	–		13.3	12.3
Eurosondagem	7–14 Nov 2018	1,018	?	26.8	41.8	7.7	7.0	7.0	1.8	–	–	–		7.9	15.0
Aximage	9–12 Nov 2018	603	67.0	26.4	37.8	9.1	7.7	6.2	–	–	–	–		12.8	11.4
Aximage	1–3 Oct 2018	601	67.0	24.0	38.9	9.1	9.2	7.4	–	–	–	[b]		11.4	14.9
Eurosondagem	5–12 Sep 2018	1,008	?	27.5	41.4	8.0	7.7	6.9	1.1	–	–			7.4	13.9
Aximage	1–2 Sep 2018	603	66.5	24.1	39.9	7.8	9.2	7.1	–	–	–			11.9	15.8
Aximage	13–16 Jul 2018	600	64.6	27.2	39.0	9.5	7.4	7.0	–	–	–			9.9	11.8
Eurosondagem	4–11 Jul 2018	1,011	?	27.3	42.0	7.9	7.5	7.3	1.1	–	–			6.9	14.7
Aximage	9–12 Jun 2018	602	67.2	27.8	37.0	10.3	6.3	7.2	–	–	–			11.4	9.2
Aximage	5–9 May 2018	600	67.2	27.6	37.7	10.0	6.7	7.7	–	–	–			10.3	10.1
Eurosondagem	3–9 May 2018	1,008	?	28.0	41.0	8.0	7.0	7.5	1.4	–	–			7.1	13.0
Aximage	8–12 Apr 2018	601	68.7	26.7	38.0	10.0	7.0	7.7	–	–	–			10.6	11.3
Eurosondagem	8–14 Mar 2018	1,010	?	28.4	41.5	7.7	6.6	7.3	1.5	–	–			7.0	13.1
Aximage	2–5 Mar 2018	605	67.3	27.0	39.2	10.0	5.4	7.4	–	–	–			11.0	12.2
Aximage	3–6 Feb 2018	603	66.4	26.4	40.6	8.8	6.2	7.7	–	–	–			10.3	14.2
Eurosondagem	14–17 Jan 2018	1,018	?	26.9	41.3	8.5	7.0	6.9	1.8	–	–			7.6	14.4
Aximage	6–9 Jan 2018	600	65.8	26.2	40.2	9.2	6.2	6.8	–	–	–			11.4	14.0
Eurosondagem	6–12 Dec 2017	1,017	?	27.9	40.2	8.6	6.9	7.0	1.7	–	[b]			7.7	12.3
Aximage	1–4 Dec 2017	603	67.4	26.1	39.9	9.3	6.5	7.5	–	–				10.7	13.8
Eurosondagem	8–15 Nov 2017	1,010	?	28.4	40.0	8.7	6.6	6.9	1.7	–				7.7	11.6
Aximage	4–6 Nov 2017	600	67.4	25.5	39.1	8.7	6.7	8.6	–	–				11.4	13.6
Aximage	14–17 Oct 2017	603	64.5	23.8	41.9	9.0	5.9	7.7	–	–				11.7	18.1
Eurosondagem	4–11 Oct 2017	1,011	?	28.0	41.0	9.0	6.0	7.5	1.4	–				7.1	13.0
2017 Local Elections	1 Oct 2017	N/A	55.0	30.3	38.7	3.3	4.1	9.5	1.1	0.3				12.7	8.4
Aximage	26–28 Sep 2017	600	65.3	25.8	43.7	7.8	4.1	7.8	–	–				10.8	17.9
Eurosondagem	31 Aug–6 Sep 2017	1,007	?	28.7	40.3	8.4	6.8	7.3	1.5	–				7.0	11.6
Aximage	29–30 Aug 2017	597	65.0	22.9	43.0	9.1	5.2	7.8	–	–				12.0	20.1
Eurosondagem	27 Jul–2 Aug 2017	1,011	?	28.1	40.8	8.4	6.9	7.6	1.1	–				7.1	12.7
Aximage	6–11 Jul 2017	604	66.4	22.9	44.0	10.1	5.3	7.8	–	–				9.9	21.1
Eurosondagem	28 Jun–5 Jul 2017	1,008	?	28.6	40.4	8.5	6.2	7.8	1.3	–				7.2	11.8
Aximage	7–11 Jun 2017	601	66.4	24.6	43.7	9.7	4.6	7.8	–	–				9.6	19.1
Eurosondagem	1–7 Jun 2017	1,010	?	29.0	40.0	8.6	6.4	7.5	1.7	–				6.8	11.0
Eurosondagem	3–10 May 2017	1,005	?	29.0	39.0	9.0	6.9	7.6	1.2	–				7.3	10.0
Aximage	5–8 May 2017	603	64.7	24.5	42.4	10.0	5.4	7.7	–	–				10.0	17.9
Eurosondagem	30 Mar–5 Apr 2017	1,003	?	29.3	39.3	9.0	6.4	7.5	1.4	–				7.1	10.0
Aximage	2–4 Apr 2017	600	?	24.6	42.0	9.5	4.8	7.6	–	–				11.5	17.4
Eurosondagem	1–8 Mar 2017	1,011	?	28.8	38.3	9.2	7.2	8.0	1.8	–				6.7	9.5
Aximage	4–6 Mar 2017	608	65.5	26.0	41.7	9.2	5.3	6.8	–	–				11.0	15.7
Aximage	5–8 Feb 2017	601	65.4	26.4	42.0	8.4	5.0	7.9	–	–				10.3	15.6
Eurosondagem	1–8 Feb 2017	1,017	?	29.2	37.8	9.2	7.0	8.3	1.1	–				7.4	8.6
Eurosondagem	5–11 Jan 2017	1,010	?	30.0	37.3	9.5	6.9	7.8	1.6	–				6.9	7.3
Aximage	6–9 Jan 2017	603	66.5	25.1	41.7	9.1	6.8	6.9	–	–				10.4	16.6
Eurosondagem	7–14 Dec 2016	1,016	?	30.0	38.0	9.1	6.8	7.7	1.6	–				6.8	8.0
Aximage	2–4 Dec 2016	605	64.3	27.4	40.1	8.3	6.7	7.5	–	–				10.0	12.7
UCP–CESOP	19–22 Nov 2016	977	?	30	43	8	6	6	2	–				5	13
Eurosondagem	2–9 Nov 2016	1,011	?	30.4	37.0	9.7	6.6	8.2	1.1	–				7.0	6.6
Aximage	31 Oct–1 Nov 2016	601	63.4	28.7	38.3	9.0	6.4	7.3	–	–				10.3	9.6
Eurosondagem	6–12 Oct 2016	1,010	?	30.7	36.3	9.5	7.0	8.3	1.3	–				6.9	5.6
Aximage	1–3 Oct 2016	608	?	30.6	37.7	8.7	6.1	7.5	–	–				9.4	7.1
Eurosondagem	7–14 Sep 2016	1,009	?	32.1	36.0	8.9	6.9	8.1	1.4	–				6.5	3.9
Aximage	2–5 Sep 2016	603	65.3	30.1	39.8	10.6	4.6	6.6	–	–				8.3	9.7
Eurosondagem	26 Jul–2 Aug 2016	1,005	?	32.5	35.5	9.7	6.0	7.8	1.4	–				7.1	3.0
Aximage	15–17 Jul 2016	606	65.0	30.5	39.0	10.0	4.9	6.8	–	–				8.8	8.5
Eurosondagem	30 Jun–6 Jul 2016	1,023	?	32.5	35.0	9.5	6.5	8.0	1.6	–				6.9	2.5
Eurosondagem	1–7 Jun 2016	1,025	?	31.9	35.3	9.9	6.8	8.1	1.5	–				6.5	3.4
Aximage	30 May–1 Jun 2016	603	65.5	32.1	38.5	10.2	4.2	6.7	–	–				8.3	6.4
Eurosondagem	5–11 May 2016	1,031	?	31.7	34.8	9.6	7.0	8.4	1.7	–			6.8	3.1
Aximage	7–9 May 2016	600	63.7	32.3	38.5	9.7	4.0	6.6	–	–			8.9	6.2
Eurosondagem	7–13 Apr 2016	1,026	?	32.0	34.3	9.7	7.7	8.3	1.3	–			6.7	2.3
Aximage	2–3 Apr 2016	601	63.9	33.5	35.6	10.0	4.2	6.2	–	–			10.5	2.1
Eurosondagem	3–9 Mar 2016	1,005	?	32.0	35.0	9.2	8.0	7.8	1.4	–			6.6	3.0
Aximage	1–4 Mar 2016	609	64.4	36.1	33.8	11.3	2.2	6.6	–	–			10.0	2.3
Eurosondagem	4–10 Feb 2016	1,010	?	32.5	33.6	10.0	7.5	8.4	1.2	–			6.8	1.1
Aximage	30–31 Jan 2016	606	67.0	36.1	34.8	10.9	2.7	6.6	–	–			8.9	1.3
Aximage	16–20 Jan 2016	1,301	65.4	35.7	35.3	10.0	3.3	6.8	–	–			8.9	0.4
Eurosondagem	1–6 Jan 2016	1,016	?	32.1	33.3	10.1	7.5	8.5	1.5	–			7.0	1.2
Aximage	2–5 Jan 2016	602	64.1	36.2	35.5	9.8	3.6	5.6	–	–			9.3	0.7
Eurosondagem	3–9 Dec 2015	1,015	?	33.0	33.7	9.5	8.0	7.8	1.3	–		6.7	0.7
Aximage	28 Nov–2 Dec 2015	605	64.8	35.3	34.0	12.1	4.1	7.4	–	–		7.1	1.3
Polling firm/Link	Fieldwork date	Sample size	Turnout									O	Lead
UCP–CESOP	5–6 Dec 2015	1,183	64	41	34	11	[c]	7	2	–		5	7
Aximage	31 Oct–4 Nov 2015	603	63.3	40.1	32.9	10.5	[c]	8.0	2.0	–		6.5	7.2
Eurosondagem	29 Oct–3 Nov 2015	1,036	?	40.8	32.5	10.0	[c]	8.0	1.5	–		7.2	8.3
Intercampus	14–17 Oct 2015	807	?	41.3	32.7	11.0	[c]	7.7	–	–		7.3	8.6
2015 Legislative Election	4 Oct 2015	N/A	55.8	38.6 107	32.3 86	10.2 19	[c]	8.3 17	1.4 1	0.7 0		9.5 0	6.3

Constituency polling[]

Lisbon district[]

Polling firm/Link	Fieldwork date	Sample size	Turnout											O	Lead
2019 Legislative Election	6 Oct 2019	N/A	57.3	22.6 12	36.7 20	9.7 5	7.8 4	4.4 2	4.4 2	2.1 1	2.5 1	1.3 0	2.0 1	6.5 0	14.1
Eurosondagem	28 Sep–1 Oct 2019	710	?	20.5 11	40.8 22/23	9.8 5	7.7 4	5.2 2/3	4.0 2	1.2 0	1.7 0/1	1.7 0/1	1.9 1	5.5 1	20.3
Eurosondagem	18–19 Sep 2019	719	?	19.1 10	40.0 22	10.1 5	7.7 4	6.6 3	4.5 2	–	–	–	2.2 1	9.8 1	20.9
Polling firm/Link	Fieldwork date	Sample size	Turnout								[b]	[b]	[b]	O	Lead
2015 Legislative Election	4 Oct 2015	N/A	60.3	34.7 18	33.5 18	10.9 5	9.8 5	[c]	2.0 1	1.3 0				9.1 0	1.2

Madeira[]

Polling firm/Link	Fieldwork date	Sample size	Turnout				JPP				O	Lead
2019 Legislative Election	6 Oct 2019	N/A	50.3	37.2 3	33.4 3	5.2 0	5.5 0	6.1 0	2.1 0	1.8 0	8.8 0	3.8
UCP–CESOP	14–15 Sep 2019	1,375	?	41	31	8	5	5	4	2	5	10
2015 Legislative Election	4 Oct 2015	N/A	48.9	37.8 3	20.9 2	10.7 1	6.9 0	6.0 0	3.6 0	1.8 0	12.4 0	16.9

Porto district[]

Polling firm/Link	Fieldwork date	Sample size	Turnout							O	Lead
2019 Legislative Election	6 Oct 2019	N/A	58.6	31.2 15	36.7 17	10.1 4	3.3 1	4.8 2	3.5 1	10.5 0	5.5
Eurosondagem	29 Sep–1 Oct 2019	771	?	26.9 12/13	40.0 17/18	10.0 4	4.8 2	5.0 2	4.4 2	8.9 0	13.1
Eurosondagem	2–4 Jul 2019	1,005	?	25.0 11/12	38.7 17/18	8.9 4	5.5 2	5.4 2	5.0 2	11.5 0	13.7
Polling firm/Link	Fieldwork date	Sample size	Turnout							O	Lead
2015 Legislative Election	4 Oct 2015	N/A	60.3	39.6 17	32.7 14	11.1 5	[c]	6.8 3	1.6 0	8.2 0	6.9

Leadership polls[]

Preferred Prime Minister[]

Poll results showing public opinion on who would make the best Prime Minister are shown in the table below in reverse chronological order, showing the most recent first.

António Costa vs Rui Rio[]

Polling firm/Link	Fieldwork date			N	Both/ O	NO	Lead
Aximage	1–8 Sep 2019	48.0	19.5	–	–	–	28.5
Aximage	12–15 Jul 2019	55.3	27.2	–	–	–	28.1
Aximage	13–19 Jun 2019	54.0	25.7	–	–	–	28.3
Aximage	3–8 May 2019	52.8	29.5	–	–	–	23.3
Aximage	30 Mar–1 Apr 2019	51.0	30.5	–	–	–	20.5
Aximage	9–13 Mar 2019	53.8	27.7	–	–	–	26.1
Aximage	5–10 Feb 2019	52.7	31.4	–	–	–	21.3
Aximage	4–7 Jan 2019	55.4	26.9	–	–	–	28.5
Aximage	7–11 Dec 2018	55.3	28.1	15.3	0.6	0.7	27.2
Aximage	9–12 Nov 2018	53.5	30.3	–	–	–	23.2
Aximage	1–3 Oct 2018	55.3	30.1	–	–	–	25.2
Aximage	1–2 Sep 2018	57.6	28.0	–	–	–	29.6
Aximage	13–16 Jul 2018	57.0	30.1	–	–	–	26.9
Aximage	9–12 Jun 2018	57.3	31.2	–	–	–	26.1
Aximage	5–9 May 2018	59.8	29.0	–	–	–	30.8
Aximage	8–12 Apr 2018	61.8	26.4	–	–	–	35.4
Aximage	2–5 Mar 2018	62.9	27.8	–	–	–	35.1
Aximage	3–6 Feb 2018	64.1	22.0	–	–	–	42.1
Eurosondagem	8–10 Jan 2018	51.3	25.1	–	–	23.6	26.2
Aximage	6–9 Jan 2018	55.7	33.0	8.1	1.2	2.0	22.7
Eurosondagem	4–6 Dec 2017	51.9	26.9	–	–	21.2	25.0
Aximage	1–4 Dec 2017	60.1	32.8	4.1	0.6	2.4	27.3
Eurosondagem	6–8 Nov 2017	52.0	25.0	–	–	23.0	27.0
Aximage	4–6 Nov 2017	56.2	34.1	6.4	0.7	2.6	22.1
Aximage	31 Oct–1 Nov 2016	48.1	43.0	2.6	1.3	5.0	5.1

António Costa vs Passos Coelho[]

Polling firm/Link	Fieldwork date			N	Both/ O	NO	Lead
Aximage	14–17 Oct 2017	67.6	20.8	10.1	0.4	1.1	46.8
Aximage	26–28 Sep 2017	64.0	24.4	–	–	–	39.6
Aximage	29–30 Aug 2017	65.8	23.4	9.2	0.9	0.9	42.4
Aximage	6–11 Jul 2017	66.3	23.2	–	–	–	43.1
Aximage	7–11 Jun 2017	69.1	22.2	6.8	0.7	1.2	46.9
Aximage	5–8 May 2017	66.2	23.3	8.4	0.7	1.4	42.9
Aximage	2–4 Apr 2017	67.5	24.1	–	–	–	43.4
Aximage	4–6 Mar 2017	63.6	26.2	8.8	0.6	0.8	37.4
Aximage	5–8 Feb 2017	66.1	25.0	7.5	0.7	0.7	41.1
Aximage	6–9 Jan 2017	64.3	23.7	–	–	–	40.6
Aximage	2–4 Dec 2016	61.6	26.5	10.5	0.6	0.8	35.1
Aximage	31 Oct–1 Nov 2016	55.4	30.8	0.4	12.5	0.9	24.6
Aximage	1–3 Oct 2016	54.0	32.8	0.4	12.1	0.7	21.2
Aximage	2–5 Sep 2016	57.3	31.2	0.4	10.3	0.8	26.1
Aximage	15–17 Jul 2016	56.8	31.6	0.8	9.5	1.3	25.2
Aximage	30 May–1 Jun 2016	55.2	35.2	7.4	1.4	0.8	20.0
Aximage	7–9 May 2016	54.5	36.1	4.9	3.5	1.0	18.4
Aximage	2–3 Apr 2016	50.8	38.8	8.4	0.5	1.5	12.0
Aximage	1–4 Mar 2016	47.8	41.6	8.4	0.5	1.7	6.2
Aximage	30–31 Jan 2016	48.1	41.9	7.6	0.7	1.7	6.2
Aximage	2–5 Jan 2016	48.3	38.9	9.5	1.1	2.2	9.4
Aximage	28 Nov–2 Dec 2015	43.2	44.3	10.5	0.6	1.4	1.1
Aximage	31 Oct–4 Nov 2015	39.6	45.5	13.7	0.2	1.0	5.9

António Costa vs Santana Lopes[]

Polling firm/Link	Fieldwork date			N	Both/ O	NO	Lead
Eurosondagem	8–10 Jan 2018	51.7	29.6	–	–	23.6	22.1
Aximage	6–9 Jan 2018	71.0	19.0	8.5	0.1	1.4	52.0
Eurosondagem	4–6 Dec 2017	52.7	30.2	–	–	17.1	22.5
Aximage	1–4 Dec 2017	71.7	19.7	6.6	0.0	2.0	52.0
Eurosondagem	6–8 Nov 2017	52.5	27.5	–	–	20.0	25.0
Aximage	4–6 Nov 2017	68.4	21.9	7.0	0.0	2.7	46.5

Notes[]

External links[]

• Marktest Opinion Poll Tracker
• ERC - Official publication of polls
• Average of polls and seat simulator