Santo Antonio weather in September 2025

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

  • 27°C maximum daytime temperature in September in Santo Antonio27
    27°C max day temperature
  • 2 hours of sunshine per day
  • 18 days with some rainfall in September in Santo Antonio18
    18 days with some rainfall
  • 21°C minimum night-time temperature in September in Santo Antonio21
    21°C min night temperature
  • 12 hours of daylight per day in September in Santo Antonio12
    12 hours of daylight per day
  • Moderate heat & humidity in September in Santo AntonioM
    Moderate heat & humidity
  • 251 mm monthly rainfall in September in Santo Antonio251
    251 mm of monthly rainfall
  • UV (maximum) index 11+ (Extreme) in September in Santo Antonio11
    11+ (Extreme) UV index
  • 26°C sea temperature in September in Santo Antonio26
    26°C sea temperature

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

Daytime temperatures usually reach 27°C in Santo Antonio in September with moderate heat and humidity, falling to 21°C at night.

How sunny is it in Santo Antonio in September?

There are normally 2 hours of bright sunshine each day in Santo Antonio in September - that's 20% of daylight hours.

How warm is the sea around Santo Antonio in September?

The average sea temperature around Santo Antonio in September is 26°C.

Does it rain in Santo Antonio in September?

There are usually 18 days with some rain in Santo Antonio in September and the average monthly rainfall is 251mm.

Santo Antonio September sunrise & sunset times

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

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Monday, 1st September 2025 05:26 17:34
Monday, 15th September 2025 05:22 17:29
Tuesday, 30th September 2025 05:17 17:23

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