Diego Garcia weather in September 2025

Expect 29°C daytime maximum temperatures in the shade with on average -9999 hours of sunshine per day in Diego Garcia in September. Check more long-term weather averages for Diego Garcia in September before you book your next holiday to British Indian Ocean Territory in 2025/2026.

  • 29°C maximum daytime temperature in September in Diego Garcia29
    29°C max day temperature
  • 16 days with some rainfall in September in Diego Garcia16
    16 days with some rainfall
  • 24°C minimum night-time temperature in September in Diego Garcia24
    24°C min night temperature
  • 12 hours of daylight per day in September in Diego Garcia12
    12 hours of daylight per day
  • High heat & humidity in September in Diego GarciaH
    High heat & humidity
  • 228 mm monthly rainfall in September in Diego Garcia228
    228 mm of monthly rainfall
  • UV (maximum) index 11+ (Extreme) in September in Diego Garcia11
    11+ (Extreme) UV index
  • 27°C sea temperature in September in Diego Garcia27
    27°C sea temperature

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The September weather guide for British Indian Ocean Territory, represented by Diego Garcia, (Diego Garcia) 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 Diego Garcia in September?

Daytime temperatures usually reach 29°C in Diego Garcia in September with high heat and humidity, falling to 24°C at night.

How warm is the sea around Diego Garcia in September?

The average sea temperature around Diego Garcia in September is 27°C.

Does it rain in Diego Garcia in September?

There are usually 16 days with some rain in Diego Garcia in September and the average monthly rainfall is 228mm.

What is the chance of a cyclone in Diego Garcia in September?

On average less than 1 day in September in Diego Garcia is likely to be affected by the passage of one or more tropical storms.

Diego Garcia September sunrise & sunset times

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

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Monday, 1st September 2025 07:11 19:10
Monday, 15th September 2025 07:04 19:07
Tuesday, 30th September 2025 06:56 19:05

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