Lisbon Weather in August

The climate in Lisbon during August can be summarized as warm and reasonably dry.

August is in the summer in Lisbon and is typically the 2nd warmest month of the year. Daytime maximum temperatures average around a comfortable 28°C (82°F), whilst at night 12°C (54°F) is normal.

On average August is the 4th wettest month of the year in Lisbon with around 66mm 2.6 inches of rain making it a reasonably dry time to visit. This rainfall is typically spread over 9 days, although this may vary considerably.

On the flip side this corresponds to an average of 10.9 hours of sunshine per day.

The data used in these monthly averages covers a period of over 100 years right up until last year. As such they are a valid prediction of what to expect for the weather in Lisbon in August 2025.