Weather in Ko Samui in September 2017

Check the weather in Ko Samui in September before you book your next holiday in Thailand. Long-term weather averages give the best indication of the weather in September 2017 and include figures for temperature, sunshine and rainfall plus sunrise & sunset times for Ko Samui, Thailand.

Weather in Ko Samui in September

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec All months

  • 31°C maximum daytime temperature in September in Ko Samui31
    31°C max day temperature
  • 6 hours of sunshine per day (47% of daylight hours) in September in Ko Samui6
    6 hours of sunshine per day
  • 17 days with some rainfall in September in Ko Samui17
    17 days with some rainfall
  • 24°C minimum night-time temperature in September in Ko Samui24
    24°C min night temperature
  • 12 hours of daylight per day in September in Ko Samui12
    12 hours of daylight per day
  • Very high heat & humidity in September in Ko SamuiVH
    Very High heat & humidity
  • 141 mm monthly rainfall in September in Ko Samui141
    141 mm of monthly rainfall
  • UV (maximum) index 11+ (Extreme) in September in Ko Samui11
    11+ (Extreme) UV index
  • 29°C sea temperature in September in Ko Samui29
    29°C sea temperature

The average maximum daytime temperature in Ko Samui in September is a hot 31°C (88°F) with very high heat & humidity. There are usually 6 hours of bright sunshine each day, which represents 47% of the 12 hours of daylight. The average sea temperature in and around Ko Samui in September is 29°C (84°F).

Expect 141mm (5.6 inches) of rainfall across the whole of September with 17 days with some rain falling. Maximum UV levels will be extreme (11+ UV index) at midday when the skies are clear. The average night-time temperature is usually a warm 24°C (75°F).

Metric (°C / mm)  |  Imperial (°F / inches)

More about Ko Samui weather

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Ko Samui sunrise & sunset times for September 2017

Browse the sunrise & sunset times for Ko Samui in September 2017. Select a month to view Ko Samui sunrise & sunset times for the next twelve months.

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Friday, 1st September 2017 06:11 18:29
Saturday, 2nd September 2017 06:11 18:28
Sunday, 3rd September 2017 06:11 18:27
Monday, 4th September 2017 06:11 18:27
Tuesday, 5th September 2017 06:10 18:26
Wednesday, 6th September 2017 06:10 18:26
Thursday, 7th September 2017 06:10 18:25
Friday, 8th September 2017 06:10 18:24
Saturday, 9th September 2017 06:10 18:24
Sunday, 10th September 2017 06:10 18:23
Monday, 11th September 2017 06:10 18:23
Tuesday, 12th September 2017 06:10 18:22
Wednesday, 13th September 2017 06:10 18:21
Thursday, 14th September 2017 06:10 18:21
Friday, 15th September 2017 06:10 18:20
Saturday, 16th September 2017 06:09 18:20
Sunday, 17th September 2017 06:09 18:19
Monday, 18th September 2017 06:09 18:18
Tuesday, 19th September 2017 06:09 18:18
Wednesday, 20th September 2017 06:09 18:17
Thursday, 21st September 2017 06:09 18:16
Friday, 22nd September 2017 06:09 18:16
Saturday, 23rd September 2017 06:09 18:15
Sunday, 24th September 2017 06:09 18:15
Monday, 25th September 2017 06:09 18:14
Tuesday, 26th September 2017 06:09 18:13
Wednesday, 27th September 2017 06:08 18:13
Thursday, 28th September 2017 06:08 18:12
Friday, 29th September 2017 06:08 18:12
Saturday, 30th September 2017 06:08 18:11
  • Save up to £300 on summer 2017 holidays to Thailand
  • FREE kids places available + low deposits
  • Get EXTRA £100 off with discount code - min spend £1,000
  • Travel between 1st May & 31st Oct 2017 (inclusive)

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Ko Samui weather by month

Check Ko Samui weather for a particular month by selecting from the list below. Monthly weather guides include figures for temperature, rainfall, sunshine hours and sea temperature plus daily sunrise & sunset times.

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