Best year time to visit Ko Samui

General weather information about Ko Samui

Average annual temperature is 27.9 °C

Absolute maximum temperature: 35.3 °C

Absolute minimum temperature: 22.1 °C

Number of sunny days: 39

Number of rainy days: 326

Number of snow days:

Average annual precipitation: 1550 mm

Look at detailed online map of Ko Samui

* Weather data for Ko Samui Thailand is based on climate observations for 2023 year

Ko Samui air temperature forecast for each month

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Absolute maximum temperature (°C) 30 30.6 32.5 34.6 35.3 32.7 33.6 33.4 31.4 31.1 30.8 30.2
Average daytime temperature (°C) 28.4 29.2 30.3 32.8 32.5 31.1 30.4 31.7 29.7 29.8 29.1 29
Average temperature (°C) 26.3 26.9 27.5 29.8 29.7 28.7 28.1 28.7 27.5 27.6 26.9 27.1
Average night temperature (°C) 24.2 24.7 25.4 27.5 27.4 26.8 26.3 26.6 25.8 25.5 25.1 25.4
Absolute minimum temperature (°C) 22.1 23.2 24 25.9 25.5 24.9 24 25.8 25 24.1 23.7 23.7

Ko Samui monthly weather indicators

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Daylight maximum duration (h) 11.7 11.9 12.2 12.5 12.6 12.7 12.7 12.5 12.3 12 11.8 11.6
Daylight mean duration (h) 11.6 11.8 12.1 12.3 12.6 12.7 12.6 12.4 12.2 11.9 11.7 11.6
Daylight minimum duration (h) 11.6 11.7 12 12.2 12.5 12.7 12.5 12.3 12.1 11.8 11.6 11.6
Sunshine mean duration (h) 9.6 10.5 10.8 11.1 10.9 9.7 8.2 10.7 8.4 9.6 8.1 9.9
Precipitation (mm) 68 65 31 34 91 127 173 111 253 207 311 80
Sunny days 4 4 16 4 3 3 3 1 1
Rainy days 27 24 15 26 28 27 28 30 30 31 29 31

Ko Samui - weather forecast by months

January February March April May June July August September October November December

Best time to visit Ko Samui:

The largest precipitation sum in Ko Samui is at

  • July — 173(mm)
  • September — 253(mm)
  • October — 207(mm)
  • November — 311(mm)

Weather forecast in the closest to Ko Samui admin centers