Koh Chang weather in September 2025

Expect 30°C daytime maximum temperatures in the shade with on average 5 hours of sunshine per day in Koh Chang in September. Check more long-term weather averages for Koh Chang in September before you book your next holiday to Thailand in 2025/2026.

  • 30°C maximum daytime temperature in September in Koh Chang30
    30°C max day temperature
  • 5 hours of sunshine per day
  • 23 days with some rainfall in September in Koh Chang23
    23 days with some rainfall
  • 23°C minimum night-time temperature in September in Koh Chang23
    23°C min night temperature
  • 12 hours of daylight per day in September in Koh Chang12
    12 hours of daylight per day
  • High heat & humidity in September in Koh ChangH
    High heat & humidity
  • 523 mm monthly rainfall in September in Koh Chang523
    523 mm of monthly rainfall
  • UV (maximum) index 11+ (Extreme) in September in Koh Chang11
    11+ (Extreme) UV index
  • 28°C sea temperature in September in Koh Chang28
    28°C sea temperature

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The September weather guide for Thailand (Koh Chang) 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 Koh Chang in September?

Daytime temperatures usually reach 30°C in Koh Chang in September with high heat and humidity, falling to 23°C at night.

How sunny is it in Koh Chang in September?

There are normally 5 hours of bright sunshine each day in Koh Chang in September - that's 39% of daylight hours.

How warm is the sea around Koh Chang in September?

The average sea temperature around Koh Chang in September is 28°C.

Does it rain in Koh Chang in September?

There are usually 23 days with some rain in Koh Chang in September and the average monthly rainfall is 523mm.

Koh Chang September sunrise & sunset times

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

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Monday, 1st September 2025 06:00 18:21
Monday, 15th September 2025 06:00 18:12
Tuesday, 30th September 2025 06:00 18:02

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