Portugal weather in May
In May, Portugal averages 22 to 24°C by day across Madeira, the Algarve and Lisbon. Algarve is the warmest at 24°C, Madeira the coolest at 22°C. The sea is 17 to 21°C.
Portugal in May, place by place
Warmest first. Anywhere at 24°C or more is proper beach weather. Tap a place for its full May detail.
Heading to Portugal in May?
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 May: quick answers
Is Portugal hot in May?
In May, Portugal averages 22 to 24°C by day across Madeira, the Algarve and Lisbon. Algarve is the warmest at 24°C, Madeira the coolest at 22°C. The sea is 17 to 21°C. May is hot in Algarve: proper beach weather.
Where is warmest in Portugal in May?
Algarve, at an average high of 24°C. The driest is Algarve, with about 30 mm of rain.
Can you swim in the sea in Portugal in May?
Portugal's sea averages below 21°C in May, so most people will find it chilly.
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 May?
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.
