Chiang Rai weather in September 2025

Expect 30°C daytime maximum temperatures in the shade with on average 6 hours of sunshine per day in Chiang Rai in September. Check more long-term weather averages for Chiang Rai in September before you book your next holiday to Thailand in 2025/2026.

  • 30°C maximum daytime temperature in September in Chiang Rai30
    30°C max day temperature
  • 6 hours of sunshine per day
  • 18 days with some rainfall in September in Chiang Rai18
    18 days with some rainfall
  • 22°C minimum night-time temperature in September in Chiang Rai22
    22°C min night temperature
  • 12 hours of daylight per day in September in Chiang Rai12
    12 hours of daylight per day
  • High heat & humidity in September in Chiang RaiH
    High heat & humidity
  • 258 mm monthly rainfall in September in Chiang Rai258
    258 mm of monthly rainfall
  • UV (maximum) index 11+ (Extreme) in September in Chiang Rai11
    11+ (Extreme) UV index

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The September weather guide for Thailand (Chiang Rai) 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 Chiang Rai in September?

Daytime temperatures usually reach 30°C in Chiang Rai in September with high heat and humidity, falling to 22°C at night.

How sunny is it in Chiang Rai in September?

There are normally 6 hours of bright sunshine each day in Chiang Rai in September - that's 46% of daylight hours.

Does it rain in Chiang Rai in September?

There are usually 18 days with some rain in Chiang Rai in September and the average monthly rainfall is 258mm.

What is the chance of a typhoon in Chiang Rai in September?

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

Chiang Rai September sunrise & sunset times

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

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Monday, 1st September 2025 06:05 18:36
Monday, 15th September 2025 06:08 18:23
Tuesday, 30th September 2025 06:11 18:10

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