Sao Tome weather in September 2025

Expect 27°C daytime maximum temperatures in the shade with on average 2 hours of sunshine per day in Sao Tome in September. Check more long-term weather averages for Sao Tome in September before you book your next holiday to Sao Tome & Principe in 2025/2026.

  • 27°C maximum daytime temperature in September in Sao Tome27
    27°C max day temperature
  • 2 hours of sunshine per day
  • 14 days with some rainfall in September in Sao Tome14
    14 days with some rainfall
  • 20°C minimum night-time temperature in September in Sao Tome20
    20°C min night temperature
  • 12 hours of daylight per day in September in Sao Tome12
    12 hours of daylight per day
  • Moderate heat & humidity in September in Sao TomeM
    Moderate heat & humidity
  • 79 mm monthly rainfall in September in Sao Tome79
    79 mm of monthly rainfall
  • UV (maximum) index 11+ (Extreme) in September in Sao Tome11
    11+ (Extreme) UV index
  • 26°C sea temperature in September in Sao Tome26
    26°C sea temperature

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The September weather guide for Sao Tome & Principe (Sao Tome) 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 Sao Tome in September?

Daytime temperatures usually reach 27°C in Sao Tome in September with moderate heat and humidity, falling to 20°C at night.

How sunny is it in Sao Tome in September?

There are normally 2 hours of bright sunshine each day in Sao Tome in September - that's 18% of daylight hours.

How warm is the sea around Sao Tome in September?

The average sea temperature around Sao Tome in September is 26°C.

Does it rain in Sao Tome in September?

There are usually 14 days with some rain in Sao Tome in September and the average monthly rainfall is 79mm.

Sao Tome September sunrise & sunset times

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

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Monday, 1st September 2025 05:30 17:37
Monday, 15th September 2025 05:25 17:32
Tuesday, 30th September 2025 05:20 17:26

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