Sao Tome & Principe 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 & Principe in September. Check more long-term weather averages for Sao Tome & Principe in September before you book your next holiday to Sao Tome & Principe in 2025/2026.

  • 27°C maximum daytime temperature in September in Sao Tome & Principe (Sao Tome)27
    27°C max day temperature
  • 2 hours of sunshine per day
  • 14 days with some rainfall in September in Sao Tome & Principe (Sao Tome)14
    14 days with some rainfall
  • 20°C minimum night-time temperature in September in Sao Tome & Principe (Sao Tome)20
    20°C min night temperature
  • 12 hours of daylight per day in September in Sao Tome & Principe (Sao Tome)12
    12 hours of daylight per day
  • Moderate heat & humidity in September in Sao Tome & Principe (Sao Tome)M
    Moderate heat & humidity
  • 79 mm monthly rainfall in September in Sao Tome & Principe (Sao Tome)79
    79 mm of monthly rainfall
  • UV (maximum) index 11+ (Extreme) in September in Sao Tome & Principe (Sao Tome)11
    11+ (Extreme) UV index
  • 26°C sea temperature in September in Sao Tome & Principe (Sao Tome)26
    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.

Top Sao Tome & Principe destinations

Below are average maximum temperatures at popular countries, regions and places in Sao Tome & Principe in September. Select a holiday destination to see more weather parameters.

All Sao Tome & Principe destinations

Metric (°C / mm)  |  Imperial (°F / inches)

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How hot is it in Sao Tome & Principe in September?

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

How sunny is it in Sao Tome & Principe in September?

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

How warm is the sea around Sao Tome & Principe in September?

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

Does it rain in Sao Tome & Principe in September?

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

Sao Tome & Principe September sunrise & sunset times

Browse the sunrise and sunset times for Sao Tome & Principe in September 2025. Select a month to view Sao Tome & Principe sunrise and sunset times for the next 12 months. The Sao Tome & Principe sunrise and sunset times shown below are for Sao Tome.

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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