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Climate · Koh Samui

Koh Samui in August

Warm and wet, as the days shorten.

Typical weather, averaged over 30 years

August in Koh Samui is warm: highs near 83°F, lows near 77°F. Rain falls on about four days a week, and the days shorten by 13 minutes from the first week to the last.August in Koh Samui is warm: highs near 28°C, lows near 25°C. Rain falls on about four days a week, and the days shorten by 13 minutes from the first week to the last.

High
83°F28°Caverage
Low
77°F25°Caverage
Wet days
4a week · 64% of days
Daylight
12h 25mon average

Is August a good time to visit Koh Samui?

August sits outside Koh Samui's best months, which run from January to March. Expect warm days and rain on about four days a week.

How we judge it: every month is scored on how close its typical high comes to the range from 70°F to 80°F, how mild its nights are, and how rarely it rains. The best months are the run of months that scores best.How we judge it: every month is scored on how close its typical high comes to the range from 21°C to 27°C, how mild its nights are, and how rarely it rains. The best months are the run of months that scores best.

How August sits in the year

week by week

Temperature

Highs near 83°F in August, against 80°F to 84°F through the year.Highs near 28°C in August, against 27°C to 29°C through the year.

Chance of a wet day

64% of days in August, against 30% to 89% through the year.

Cloud cover

79% cover in August, against 59% to 80% through the year.

Daylight

12h 25m in August, against 11h 35m to 12h 40m through the year.

Week by week, lightly smoothed, with August shaded. The olive line marks the best months. Hover or tap a week for its figures.

Either side

  1. July84°29°low 78°low 26°5 wet days a weekRain on about five days a week.
  2. August83°28°low 77°low 25°4 wet days a weekRain on about four days a week.
  3. September82°28°low 77°low 25°6 wet days a weekRain on about six days a week.

Where Koh Samui sits, in August

Asia/Bangkok
this place
typical high in August 40°F4°C95°F35°C
Sunrise, mid-August
6:12 AMsets 6:38 PM
Above the sea
420 mlow-lying
Latitude
9.5°Nnorthern hemisphere
Nearest of ours
Krabi183 km south-west

The land around Koh Samui, shaded by its typical high in August, the planning map's own layer. Hover the map for the figure at that spot; tap it on a phone. Clock times are local, for the 15th.

Elsewhere in Thailand in August

high · low · wet days
See August on the planning mapThe whole year in Koh Samui

Typical weather, averaged over 30 years (1995–2024), from the 11 km grid square nearest Koh Samui. Temperatures are adjusted against 66 weather stations: daytime highs read about 3.1°F cold in the source data and are raised to match, and both highs and lows are adjusted for the town's height (420 m) against the climate model's (71 m).Temperatures are adjusted against 66 weather stations: daytime highs read about 1.7°C cold in the source data and are raised to match, and both highs and lows are adjusted for the town's height (420 m) against the climate model's (71 m). Daylight is calculated from latitude. Charts are lightly smoothed week to week; the figures in the table are not. Source: Copernicus ERA5-Land reanalysis; cloud cover from NASA's MERRA-2 reanalysis, on a coarser grid of about 50 km. Contains modified Copernicus Climate Change Service information 2026; neither the European Commission nor ECMWF is responsible for any use of it. These are averages, not a forecast.

Daylight is calculated from latitude. Charts are lightly smoothed week to week; the figures in the table are not.

Source: Copernicus ERA5-Land reanalysis; cloud cover from NASA's MERRA-2 reanalysis, on a coarser grid of about 50 km. Contains modified Copernicus Climate Change Service information 2026; neither the European Commission nor ECMWF is responsible for any use of it. These are averages, not a forecast.