Lisbon weather in September 2026

Q: How hot is it in Lisbon in September?

Daytime temperatures usually reach 27°C in Lisbon in September with low heat and humidity, falling to 17°C at night.

Q: How sunny is it in Lisbon in September?

There are normally 9 hours of bright sunshine each day in Lisbon in September - that's 68% of daylight hours.

Q: How warm is the sea around Lisbon in September?

The average sea temperature around Lisbon in September is 19°C.

Q: Does it rain in Lisbon in September?

There are usually 6 days with some rain in Lisbon in September and the average monthly rainfall is 26mm.

Expect daytime maximum temperatures of 27°C in Lisbon, Portugal in September based on long-term weather averages. There are 9 hours of sunshine per day on average.

27
27°C max day temperature
9
9 hours of sunshine per day
6
6 days with some rainfall
17
17°C min night temperature
12
12 hours of daylight per day
L
Low heat & humidity
26
26 mm of monthly rainfall
6
6 (High) UV index
19
19°C sea temperature

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The September 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)