Lisbon weather in August 2025

Expect 28°C 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.

  • 28°C maximum daytime temperature in August in Lisbon28
    28°C max day temperature
  • 11 hours of sunshine per day
  • 2 days with some rainfall in August in Lisbon2
    2 days with some rainfall
  • 18°C minimum night-time temperature in August in Lisbon18
    18°C 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
  • 5 mm monthly rainfall in August in Lisbon5
    5 mm of monthly rainfall
  • UV (maximum) index 8 (Very High) in August in Lisbon8
    8 (Very High) UV index
  • 19°C sea temperature in August in Lisbon19
    19°C 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 / mm)  |  Imperial (°F / inches)

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How hot is it in Lisbon in August?

Daytime temperatures usually reach 28°C in Lisbon in August with moderate heat and humidity, falling to 18°C 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 19°C.

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 5mm.

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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