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Each poll as published, with its pollster, fieldwork dates, sample size and a link to the source.

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Sample size is how many people were asked. More people means less random error, never none.
±3 is the margin of error: the real figure is likely within 3 points either way of the one shown.
Two polls can differ because they were taken on different dates, with different methods and different samples.
est. means the institute did not publish a margin of error, so it is estimated from the sample size.
The average smooths this out: it combines recent polls, so one unusual poll cannot swing the picture.

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44 polls · page 1 of 3 · Clear filters

Polls with institute, dates, sample, margin of error, methodology and results
Institute	Date	Fieldwork	Sample	MoE	Method	Voting intention	Source
ICS/ISCTE 🇵🇹 Portugal · Next Portuguese Legislative Election	25 Oct 2026*	16 Oct 2026 – 25 Oct 2026	808	±3.4 est. (Not published: estimated from sample size (95%, simple random sample))	—	PS 30.0% CH 26.0% AD 26.0% IL 4.0% L 4.0% CDU 3.0% BE 2.0% PAN 0.0% JPP 0.0%	Source for ICS/ISCTE poll (opens in a new tab)
Pitagórica 🇵🇹 Portugal · Next Portuguese Legislative Election	16 Oct 2026*	21 Sept 2026 – 16 Oct 2026	804	±3.5 est. (Not published: estimated from sample size (95%, simple random sample))	—	PS 28.6% CH 27.9% AD 22.8% IL 7.0% CDU 3.2% L 2.8% BE 1.8% PAN 1.3%	Source for Pitagórica poll (opens in a new tab)
Intercampus 🇵🇹 Portugal · Next Portuguese Legislative Election	12 Oct 2026*	6 Oct 2026 – 12 Oct 2026	615	±4.0 est. (Not published: estimated from sample size (95%, simple random sample))	—	PS 24.4% CH 24.0% AD 21.7% IL 8.0% L 5.5% CDU 4.7% PAN 4.1% BE 2.8%	Source for Intercampus poll (opens in a new tab)
Pitagórica 🇵🇹 Portugal · Next Portuguese Legislative Election	10 Oct 2026*	14 Sept 2026 – 10 Oct 2026	804	±3.5 est. (Not published: estimated from sample size (95%, simple random sample))	—	PS 28.3% CH 27.9% AD 22.9% IL 6.8% L 3.1% CDU 2.6% BE 1.7% PAN 1.0%	Source for Pitagórica poll (opens in a new tab)
Aximage 🇵🇹 Portugal · Next Portuguese Legislative Election	7 Oct 2026*	6 Oct 2026 – 7 Oct 2026	501	±4.4 est. (Not published: estimated from sample size (95%, simple random sample))	—	CH 30.7% PS 28.9% AD 21.7% IL 5.6% L 3.3% PAN 2.0% CDU 1.8% BE 1.7%	Source for Aximage poll (opens in a new tab)
Pitagórica 🇵🇹 Portugal · Next Portuguese Legislative Election	3 Oct 2026*	7 Sept 2026 – 3 Oct 2026	804	±3.5 est. (Not published: estimated from sample size (95%, simple random sample))	—	PS 27.5% CH 27.3% AD 23.9% IL 6.7% CDU 2.8% L 2.7% BE 1.7% PAN 1.0%	Source for Pitagórica poll (opens in a new tab)
Pitagórica 🇵🇹 Portugal · Next Portuguese Legislative Election	26 Sept 2026*	31 Aug 2026 – 26 Sept 2026	804	±3.5 est. (Not published: estimated from sample size (95%, simple random sample))	—	PS 27.7% CH 27.4% AD 24.8% IL 6.3% L 3.3% CDU 2.4% BE 1.6% PAN 1.1%	Source for Pitagórica poll (opens in a new tab)
Pitagórica 🇵🇹 Portugal · Next Portuguese Legislative Election	18 Sept 2026*	24 Aug 2026 – 18 Sept 2026	804	±3.5 est. (Not published: estimated from sample size (95%, simple random sample))	—	PS 27.9% CH 27.3% AD 25.1% IL 6.5% L 3.9% CDU 2.0% BE 1.6% PAN 0.7%	Source for Pitagórica poll (opens in a new tab)
Aximage 🇵🇹 Portugal · Next Portuguese Legislative Election	15 Sept 2026*	14 Sept 2026 – 15 Sept 2026	500	±4.4 est. (Not published: estimated from sample size (95%, simple random sample))	—	PS 29.1% CH 28.6% AD 21.9% IL 6.3% L 3.1% PAN 2.5% CDU 1.7% BE 0.9%	Source for Aximage poll (opens in a new tab)
Pitagórica 🇵🇹 Portugal · Next Portuguese Legislative Election	14 Sept 2026*	24 Aug 2026 – 14 Sept 2026	804	±3.5 est. (Not published: estimated from sample size (95%, simple random sample))	—	PS 27.9% CH 27.3% AD 25.1% IL 6.5% L 3.9% CDU 2.0% BE 1.6% PAN 0.7%	Source for Pitagórica poll (opens in a new tab)
Intercampus 🇵🇹 Portugal · Next Portuguese Legislative Election	14 Sept 2026*	7 Sept 2026 – 14 Sept 2026	609	±4.0 est. (Not published: estimated from sample size (95%, simple random sample))	—	PS 27.5% CH 23.9% AD 23.4% IL 9.9% L 4.0% BE 2.8% CDU 2.2% PAN 2.0%	Source for Intercampus poll (opens in a new tab)
Pitagórica 🇵🇹 Portugal · Next Portuguese Legislative Election	12 Sept 2026*	18 Aug 2026 – 12 Sept 2026	804	±3.5 est. (Not published: estimated from sample size (95%, simple random sample))	—	PS 28.6% CH 27.6% AD 24.3% IL 6.7% L 4.2% CDU 2.3% BE 1.4% PAN 1.3%	Source for Pitagórica poll (opens in a new tab)
Pitagórica 🇵🇹 Portugal · Next Portuguese Legislative Election	7 Sept 2026*	17 Aug 2026 – 7 Sept 2026	804	±3.5 est. (Not published: estimated from sample size (95%, simple random sample))	—	PS 28.6% CH 27.6% AD 24.3% IL 6.7% L 4.2% CDU 2.3% BE 1.4% PAN 1.3%	Source for Pitagórica poll (opens in a new tab)
Aximage 🇵🇹 Portugal · Next Portuguese Legislative Election	7 Sept 2026*	1 Sept 2026 – 7 Sept 2026	1,109	±2.9 est. (Not published: estimated from sample size (95%, simple random sample))	—	PS 29.7% CH 25.4% AD 20.9% IL 7.9% L 3.4% CDU 3.0% PAN 2.4% BE 1.6%	Source for Aximage poll (opens in a new tab)
Pitagórica 🇵🇹 Portugal · Next Portuguese Legislative Election	4 Sept 2026*	10 Aug 2026 – 4 Sept 2026	804	±3.5 est. (Not published: estimated from sample size (95%, simple random sample))	—	PS 27.9% CH 27.1% AD 25.7% IL 6.1% L 4.0% CDU 2.4% BE 2.2% PAN 1.3%	Source for Pitagórica poll (opens in a new tab)
Pitagórica 🇵🇹 Portugal · Next Portuguese Legislative Election	31 Aug 2026*	10 Aug 2026 – 31 Aug 2026	804	±3.5 est. (Not published: estimated from sample size (95%, simple random sample))	—	PS 27.9% CH 27.1% AD 25.7% IL 6.1% L 4.0% CDU 2.4% BE 2.2% PAN 1.3%	Source for Pitagórica poll (opens in a new tab)
Intercampus 🇵🇹 Portugal · Next Portuguese Legislative Election	31 Jul 2026*	10 Jul 2026 – 31 Jul 2026	803	±3.5 est. (Not published: estimated from sample size (95%, simple random sample))	—	PS 26.9% CH 24.4% AD 22.2% IL 8.1% L 6.9% PAN 3.2% BE 3.0% CDU 3.0%	Source for Intercampus poll (opens in a new tab)
Aximage 🇵🇹 Portugal · Next Portuguese Legislative Election	27 Jul 2026*	22 Jul 2026 – 27 Jul 2026	802	±3.5 est. (Not published: estimated from sample size (95%, simple random sample))	—	PS 28.7% CH 26.2% AD 25.0% IL 7.4% L 3.3% CDU 2.3% BE 1.8% PAN 1.0%	Source for Aximage poll (opens in a new tab)
Aximage 🇵🇹 Portugal · Next Portuguese Legislative Election	21 Jul 2026*	20 Jul 2026 – 21 Jul 2026	501	±4.4 est. (Not published: estimated from sample size (95%, simple random sample))	—	PS 29.2% CH 26.4% AD 23.2% IL 7.4% L 4.6% PAN 2.1% CDU 1.8% BE 1.3%	Source for Aximage poll (opens in a new tab)
Intercampus 🇵🇹 Portugal · Next Portuguese Legislative Election	14 Jul 2026*	9 Jul 2026 – 14 Jul 2026	604	±4.0 est. (Not published: estimated from sample size (95%, simple random sample))	—	PS 26.6% AD 22.8% CH 22.1% IL 8.7% L 7.8% CDU 4.7% PAN 2.9% BE 2.1%	Source for Intercampus poll (opens in a new tab)

* End of fieldwork: the source states no publication date.

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