Cascais weather in May 2025

Expect daytime maximum temperatures of 21°C in Cascais, Portugal in May based on long-term weather averages. There are 9 hours of sunshine per day on average with typically 46 mm of rainfall in the month.

  • 21°C maximum daytime temperature in May in Cascais21
    21°C max day temperature
  • 9 hours of sunshine per day
  • 9 days with some rainfall in May in Cascais9
    9 days with some rainfall
  • 13°C minimum night-time temperature in May in Cascais13
    13°C min night temperature
  • 14 hours of daylight per day in May in Cascais14
    14 hours of daylight per day
  • No heat & humidity in May in Cascais0
    No heat & humidity
  • 46 mm monthly rainfall in May in Cascais46
    46 mm of monthly rainfall
  • UV (maximum) index 8 (Very High) in May in Cascais8
    8 (Very High) UV index
  • 16°C sea temperature in May in Cascais16
    16°C sea temperature

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The May weather guide for Portugal (Cascais) 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 Cascais in May?

Daytime temperatures usually reach 21°C in Cascais in May, falling to 13°C at night.

How sunny is it in Cascais in May?

There are normally 9 hours of bright sunshine each day in Cascais in May - that's 65% of daylight hours.

How warm is the sea around Cascais in May?

The average sea temperature around Cascais in May is 16°C.

Does it rain in Cascais in May?

There are usually 9 days with some rain in Cascais in May and the average monthly rainfall is 46mm.

Cascais May sunrise & sunset times

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

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Thursday, 1st May 2025 05:40 19:30
Friday, 16th May 2025 05:25 19:44
Saturday, 31st May 2025 05:15 19:56

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