Porto weather in May 2025

Expect 20°C daytime maximum temperatures in the shade with on average 9 hours of sunshine per day in Porto in May. Check more long-term weather averages for Porto in May before you book your next holiday to Portugal in 2025/2026.

  • 20°C maximum daytime temperature in May in Porto20
    20°C max day temperature
  • 9 hours of sunshine per day
  • 13 days with some rainfall in May in Porto13
    13 days with some rainfall
  • 11°C minimum night-time temperature in May in Porto11
    11°C min night temperature
  • 15 hours of daylight per day in May in Porto15
    15 hours of daylight per day
  • No heat & humidity in May in Porto0
    No heat & humidity
  • 86 mm monthly rainfall in May in Porto86
    86 mm of monthly rainfall
  • UV (maximum) index 7 (High) in May in Porto7
    7 (High) UV index
  • 15°C sea temperature in May in Porto15
    15°C sea temperature

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The May weather guide for Portugal (Porto) shows long term weather averages processed from data supplied by CRU (University of East Anglia), the Met Office & the Netherlands Meteorological Institute. Find out more about our data sources.

Metric (°C / mm)  |  Imperial (°F / inches)

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More about Portugal

How hot is it in Porto in May?

Daytime temperatures usually reach 20°C in Porto in May, falling to 11°C at night.

How sunny is it in Porto in May?

There are normally 9 hours of bright sunshine each day in Porto in May - that's 59% of daylight hours.

How warm is the sea around Porto in May?

The average sea temperature around Porto in May is 15°C.

Does it rain in Porto in May?

There are usually 13 days with some rain in Porto in May and the average monthly rainfall is 86mm.

Porto May sunrise & sunset times

Browse the sunrise and sunset times for Porto in May 2025. Select a month to view Porto sunrise and sunset times for the next 12 months.

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Thursday, 1st May 2025 05:32 19:32
Friday, 16th May 2025 05:15 19:47
Saturday, 31st May 2025 05:05 20:00

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