Cascais weather in August 2025

Expect 27°C daytime maximum temperatures in the shade with on average 11 hours of sunshine per day in Cascais in August. Check more long-term weather averages for Cascais in August before you book your next holiday to Portugal in 2025/2026.

  • 27°C maximum daytime temperature in August in Cascais27
    27°C max day temperature
  • 11 hours of sunshine per day
  • 2 days with some rainfall in August in Cascais2
    2 days with some rainfall
  • 17°C minimum night-time temperature in August in Cascais17
    17°C min night temperature
  • 14 hours of daylight per day in August in Cascais14
    14 hours of daylight per day
  • No heat & humidity in August in Cascais0
    No heat & humidity
  • 8 mm monthly rainfall in August in Cascais8
    8 mm of monthly rainfall
  • UV (maximum) index 8 (Very High) in August in Cascais8
    8 (Very High) UV index
  • 19°C sea temperature in August in Cascais19
    19°C sea temperature

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The August 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 August?

Daytime temperatures usually reach 27°C in Cascais in August with no heat and humidity, falling to 17°C at night.

How sunny is it in Cascais in August?

There are normally 11 hours of bright sunshine each day in Cascais in August - that's 79% of daylight hours.

How warm is the sea around Cascais in August?

The average sea temperature around Cascais in August is 19°C.

Does it ever rain in Cascais in August?

There are usually 2 days with some rain in Cascais in August and the average monthly rainfall is 8mm.

Cascais August sunrise & sunset times

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

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Friday, 1st August 2025 05:39 19:48
Saturday, 16th August 2025 05:53 19:31
Sunday, 31st August 2025 06:06 19:09

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