Portugal weather in September
In September, Portugal averages 26 to 28°C by day across Madeira, the Algarve and Lisbon. Algarve is the warmest at 28°C, Madeira the coolest at 26°C. The sea is 17 to 24°C.
Portugal in September, place by place
Warmest first. Anywhere at 24°C or more is proper beach weather. Tap a place for its full September detail.
Heading to Portugal in September?
Share the places you've saved on TikTok and Instagram for Portugal to Dream Trip. It pins them on a map and builds your days around them.
Portugal in September: quick answers
Is Portugal hot in September?
In September, Portugal averages 26 to 28°C by day across Madeira, the Algarve and Lisbon. Algarve is the warmest at 28°C, Madeira the coolest at 26°C. The sea is 17 to 24°C. September is hot in Algarve: proper beach weather.
Where is warmest in Portugal in September?
Algarve, at an average high of 28°C. The driest is Algarve, with about 16 mm of rain.
Can you swim in the sea in Portugal in September?
Yes: Madeira (24°C) has sea temperatures of 21°C or more, comfortable without a wetsuit.
How we measured this
Portugal here means Madeira, the Algarve and Lisbon: the places we measure. Figures are averages of every day from 2016 to 2025 from the Open-Meteo historical weather archive (ECMWF ERA5); sea temperatures are 2023 to 2025 averages. Rain is the average monthly total, and 150 mm or more counts as rainy season.
Planning Portugal in September?
Save the places you find on TikTok and Instagram for Portugal to one map, and Dream Trip turns them into a day-by-day plan.
