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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 max day temperature
28 - 11 hours of sunshine per day
- 2 days with some rainfall
2 - 18°C min night temperature
18 - 14 hours of daylight per day
14 - Moderate heat & humidity
M - 5 mm of monthly rainfall
5 - 8 (Very High) UV index
8 - 19°C sea temperature
19
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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)
More about Portugal
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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