Porto weather in August 2026

Q: How hot is it in Porto in August?

Daytime temperatures usually reach 28°C in Porto in August with moderate heat and humidity, falling to 18°C at night.

Q: How sunny is it in Porto in August?

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

Q: How warm is the sea around Porto in August?

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

Q: Does it ever rain in Porto in August?

There are usually 2 days with some rain in Porto in August and the average monthly rainfall is 5mm.

Expect daytime maximum temperatures of 25°C in Porto, Portugal in August based on long-term weather averages. There are 10 hours of sunshine per day on average.

25
25°C max day temperature
10
10 hours of sunshine per day
5
5 days with some rainfall
15
15°C min night temperature
14
14 hours of daylight per day
0
No heat & humidity
20
20 mm of monthly rainfall
8
8 (Very High) UV index
18
18°C sea temperature

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The August weather guide for Portugal (Porto) 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)