Lisbon weather in September 2025

Expect 27°C daytime maximum temperatures in the shade with on average 9 hours of sunshine per day in Lisbon in September. Check more long-term weather averages for Lisbon in September before you book your next holiday to Portugal in 2025/2026.

  • 27°C maximum daytime temperature in September in Lisbon27
    27°C max day temperature
  • 9 hours of sunshine per day
  • 6 days with some rainfall in September in Lisbon6
    6 days with some rainfall
  • 17°C minimum night-time temperature in September in Lisbon17
    17°C min night temperature
  • 12 hours of daylight per day in September in Lisbon12
    12 hours of daylight per day
  • Low heat & humidity in September in LisbonL
    Low heat & humidity
  • 26 mm monthly rainfall in September in Lisbon26
    26 mm of monthly rainfall
  • UV (maximum) index 6 (High) in September in Lisbon6
    6 (High) UV index
  • 19°C sea temperature in September in Lisbon19
    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)

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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.

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.

How warm is the sea around Lisbon in September?

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

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.

Lisbon September sunrise & sunset times

Browse the sunrise and sunset times for Lisbon in September 2025. Select a month to view Lisbon sunrise and sunset times for the next 12 months.

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Monday, 1st September 2025 06:06 19:07
Monday, 15th September 2025 06:18 18:45
Tuesday, 30th September 2025 06:32 18:21

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