Warm
Average highs sit around 31°C, giving warm days by monthly-average standards.
August verdict
Koh Samui, Thailand in August
Weather score60Good
Good for holiday weather
Average highs sit around 31°C, giving warm days by monthly-average standards. Sunshine averages 5.5h per day, enough for a balanced month. Rainfall averages 137mm, so some wet days are possible.
August weather
Monthly averages
Temp
31°C
Rain
137mm
Sun
5.5h
Sea
29°C
Weather score
60
Good
Seasonal climate calendar
TemperatureTemp
RainRain
SunSun
SwimSwim
Weather scoreWeather score
Trip feel
Showers
Rainfall averages 137mm, so some wet days are possible.
Some sun
Sunshine averages 5.5h per day, enough for a balanced month.
Warm sea
Sea temperatures average 29°C, so swimming is usually comfortable by monthly-average standards.
Map
Weather map
Compare Koh Samui, Thailand with nearby places by weather score, rain, sun, temperature, and swim conditions.
Temperature
August31°C average high
August sits in the warmer part of the year, so midday sightseeing can feel heavier than in cooler months.
Warmest monthsApril to September
This stretch sets the upper range for average daytime heat.
Rain
August137mm average rain
August sits on the drier side of Koh Samui's year, which helps with sightseeing and transfers.
Driest monthsJanuary to September
This is the drier part of the year, when outdoor plans usually need less weather flexibility.
Sun
August5.5 hours average sun
August is one of Koh Samui's cloudier months, so sunshine-led plans are less reliable.
Brightest monthsFebruary to April
This stretch has the strongest sunshine in the monthly averages.
Sea temperature
August29°C average sea
August is close to Koh Samui's yearly sea-temperature average, so swimming comfort is fairly typical.
Warmest seaApril to September
Sea temperatures are usually near 30°C in this stretch, so swimming comfort is at its strongest.
Weather score
August60 weather score
August scores below Koh Samui's yearly average, so the weather trade-offs are more noticeable.
Best weather monthsFebruary to March
These months have the strongest weather score in the monthly averages.
