Ko Samui monthly weather averages

  • Average daytime temperature

    The bar chart below shows the average monthly peak daytime temperatures at Ko Samui

    Ko Samui average temperature chart
    Average monthly temperatures in Ko Samui (degrees centigrade and fahrenheit)
      Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
    °C 28.4 29.1 30.2 31.6 31.8 31.3 31 30.9 30.6 29.9 28.7 28.4
    °F 83.2 84.3 86.4 88.8 89.2 88.3 87.8 87.6 87.1 85.8 83.7 83

    Please note: these are the average peak daytime temperatures (usually around mid-afternoon) so do not show daytime / night highs and lows. To see the daily range of temperatures have a look at the temperature max / min chart below.

  • Average rainfall & rainy days

    The graph below shows the average rainfall and number of rainy days per month.

    Average monthly rainfall in Ko Samui (mm and inches)
      Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
    mm 123 39 54 85 172 118 146 137 141 275 463 188
    inches 4.8 1.5 2.1 3.3 6.8 4.6 5.7 5.4 5.5 10.8 18.2 7.4
    Rainy days 10 5 5 8 17 16 17 17 17 20 19 13
  • Average daily sunshine

    The bar chart below shows the average daily sunshine hours in Ko Samui

    Average daily sunshine Ko Samui
      Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
    Hrs sunshine 7.6 8.7 8.7 8.3 6.7 6 6.2 5.9 5.9 6.2 6.2 7
  • Day / night temperatures

    The graph below shows the daily range of temperatures for each month.

    Maximum and minimum daily temperatures in Ko Samui (degrees centigrade and fahrenheit)
      Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
    Min °C 22.2 23.4 24 24.7 24.5 24.4 23.9 24 23.6 23.4 22.8 22.3
    Max °C 28.6 29.2 30.4 31.8 32 31.5 31.2 31.1 30.8 30.1 28.9 28.5
    Min °F 72 74.1 75.2 76.4 76 75.8 74.9 75.1 74.5 74 73 72.1
    Max °F 77.7 79.3 81 82.8 82.8 82.2 81.5 81.5 81 80.1 78.4 77.7
  • Sea temperature

    The graph below shows the average sea temperature.

    Average sea temperature around Ko Samui in degrees centigrade and fahrenheit
      Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
    °C 28 28.4 29.1 30 30.2 29.8 29.5 29.3 29.1 29.1 28.9 28.3
    °F 82.4 83.1 84.3 85.9 86.4 85.7 85.1 84.7 84.4 84.3 84.1 83
  • Wind speed

    The graph below shows the average wind speed.

    Average wind speed in Ko Samui (mph and kmh)
      Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
    km/h 10 10 9 7 7 9 9 9 7 5 7 9
    mph 6 7 6 5 4 6 5 6 5 3 5 6

    A monthly average windspeed of over 16km/h or 10mph suggests a location is fairly windy.

  • Relative humidity

    The graph below shows the average relative humidity.

    Average relative humidity in Ko Samui
    Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
    79% 79% 78% 78% 78% 77% 77% 78% 78% 83% 83% 80%
Ko Samui

Other monthly averages

Ko Samui weather stats

Ko Samui weather statistics
Hottest month: April 31.6°C 88.9°F
Driest month: February 39mm 1.5ins
Sunniest month: February 8.7hrs
Coldest month: January 28.4°C 83.1°F
Wettest month: November 463mm 18.2ins
Warmest sea: May 30.2°C 86.4°F
Map showing location of Ko Samui (9.53567, 99.93567)

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