Sao Tome weather in September 2025

Expect daytime maximum temperatures of 81°F in Sao Tome, Sao Tome & Principe in September based on long-term weather averages. There are 2 hours of sunshine per day on average with 14 days with some rainfall and typically 3.1 inches of rainfall in the month.

  • 81°F maximum daytime temperature in September in Sao Tome81
    81°F max day temperature
  • 2 hours of sunshine per day
  • 14 days with some rainfall in September in Sao Tome14
    14 days with some rainfall
  • 68°F minimum night-time temperature in September in Sao Tome68
    68°F 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
  • 3.1 inches monthly rainfall in September in Sao Tome3.1
    3.1 inches of monthly rainfall
  • UV (maximum) index 11+ (Extreme) in September in Sao Tome11
    11+ (Extreme) UV index
  • 79°F sea temperature in September in Sao Tome79
    79°F 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)  |  Imperial (°F)

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How hot is it in Sao Tome in September?

Daytime temperatures usually reach 81°F in Sao Tome in September with moderate heat and humidity, falling to 68°F 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 79°F.

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 3.1 inches.

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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