Lisbon weather in August 2025

Expect 82°F daytime maximum temperatures in the shade with on average 11 hours of sunshine per day in Lisbon in August. Check more long-term weather averages for Lisbon in August before you book your next holiday to Portugal in 2025/2026.

  • 82°F maximum daytime temperature in August in Lisbon82
    82°F max day temperature
  • 11 hours of sunshine per day
  • 2 days with some rainfall in August in Lisbon2
    2 days with some rainfall
  • 64°F minimum night-time temperature in August in Lisbon64
    64°F min night temperature
  • 14 hours of daylight per day in August in Lisbon14
    14 hours of daylight per day
  • Moderate heat & humidity in August in LisbonM
    Moderate heat & humidity
  • 0.2 inches monthly rainfall in August in Lisbon0.2
    0.2 inches of monthly rainfall
  • UV (maximum) index 8 (Very High) in August in Lisbon8
    8 (Very High) UV index
  • 66°F sea temperature in August in Lisbon66
    66°F sea temperature

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The August weather guide for Portugal (Lisbon) 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)  |  Imperial (°F)

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More about Portugal

How hot is it in Lisbon in August?

Daytime temperatures usually reach 82°F in Lisbon in August with moderate heat and humidity, falling to 64°F at night.

How sunny is it in Lisbon in August?

There are normally 11 hours of bright sunshine each day in Lisbon in August - that's 80% of daylight hours.

How warm is the sea around Lisbon in August?

The average sea temperature around Lisbon in August is 66°F.

Does it ever rain in Lisbon in August?

There are usually 2 days with some rain in Lisbon in August and the average monthly rainfall is 0.2 inches.

Lisbon August sunrise & sunset times

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

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Friday, 1st August 2025 05:38 19:47
Saturday, 16th August 2025 05:52 19:29
Sunday, 31st August 2025 06:05 19:08

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