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Best
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Best
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Best
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Tan
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Tan
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Tan
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Tan
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Sea
27°
Swim
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Sea
28°
Swim
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Sea
28°
Swim
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Sea
30°
Swim
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30°
Swim
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Sea
30°
Swim
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Sea
30°
Swim
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Sea
30°
Swim
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Sea
29°
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Sea
29°
Swim
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Sea
29°
Swim
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Sea
27°
Swim
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The annual average maximum daily temperature is 31.5°C (88.6°F) which is very hot and perfect for sunbathing on clear days. The annual average water temperature is typically 28.9°C (84.1°F) which is very warm and ideal for relaxing and swimming for the whole day. Annually there are on average 14.5 days of rain per month and 6.1 hours of sun per day.
The best months to visit Ko Samui are January, February, March, April, for the best beach weather, the most sunshine and optimal sunbathing and swimming conditions with the least chance of rain.
The sea is best for swimming between December and October when the sea temperature is above the average 29°C (84°F) which is very warm and ideal for relaxing and swimming for the whole day.
Yes, you can sunbathe in Ko Samui all year round.
The coolest month in Ko Samui is January when the average maximum temperature is 30°C (86°F), average temperature is 28°C (82°F) and average minimum temperature is 25°C (78°F).
More info about the annual temperatures and sunshine.
Yes, you can swim in Ko Samui all year round.
The warmest sea water temperatures in Ko Samui are found in June when they peak at 30°C (86°F) and lowest in December when they dip to 27°C (80°F).
The sea is excellent for swimming all year round as the water temperature is very warm and ideal for relaxing and swimming for the whole day.
More info about the annual sea temperatures
The hottest month in Ko Samui is May when the average maximum temperature is very hot and perfect for sunbathing on clear days 33°C (91°F), average temperature is 30°C (86°F) and average minimum temperature is 27°C (81°F).
More info about the annual temperatures and sunshine.
The coolest month in Ko Samui is January when the average maximum temperature is 30°C (86°F), average temperature is 28°C (82°F) and average minimum temperature is 25°C (78°F).
More info about the annual temperatures and sunshine
The driest month in Ko Samui is February with 1.3cm (0.5inches) of rain and the least days of rain with 3 days with some rain, a very dry time to visit the beach.
More info about the annual rainfall
The coldest sea water temperatures in Ko Samui are found in December when they dip to 27°C (80°F) which is very warm and ideal for relaxing and swimming for the whole day.
More info about the annual sea temperatures.
The warmest sea water temperatures in Ko Samui are found in June when they peak at 30°C (86°F) which is very warm and ideal for relaxing and swimming for the whole day.
More info about the annual sea temperatures.
The most humid month in Ko Samui is April with a dew point (an indicator of humidity) of 26°C (79°F) which is very uncomfortable and fairly oppressive unless you are on a beach. At night you would most likely require airconditioning.
More info about the annual humidity.
The least humid month in Ko Samui is January with a dew point of 24°C (75°F) which is very uncomfortable and fairly oppressive unless you are on a beach. At night you would most likely require airconditioning.
More info about the annual humidity.
The most windy month in Ko Samui is July when the average maximum windspeed is 25KM/H (16MPH) and the average wind speed is 11KM/H (7MPH).
More info about the annual wind conditions.
The hottest month in Ko Samui is May when the average maximum temperature is 33°C (91°F), average temperature is 30°C (86°F) and average minimum temperature is 27°C (81°F).
The coolest month in Ko Samui is January when the average maximum temperature is 30°C (30°F), average temperature is 28°C (82°F) and average minimum temperature is 25°C (78°F).
The longest days in Ko Samui are in June, with an average of 12.7 hours of daylight per day. January has the shortest days with an average of 11.6 hours of daylight per day.
The sunniest days in Ko Samui are in July which has the most hours of sunshine per day. The sunshine percentage is 57.1% making it quite sunny but with occasional periods of cloudy and overcast skies. There are 7.2 hours of sunshine per day.
January has the least sunshine. The sunshine percentage is 42.8% making it quite sunny but with regular periods of cloudy and overcast skies. There are 5.0 hours of sunshine per day.
The ultraviolet index is the highest in March when it reaches 14.8 and lowest in December when it reaches 10.5.
An ultraviolet index reading above 11 indicates an extreme risk of harm from unprotected sun exposure. Unprotected skin risks burning in less than 10 minutes. Take all precautions because unprotected skin and eyes can burn in minutes. Tanning will be safest before 10am and after 4pm but only with a good application of sun screen. For those with sensitive skin stay in the shade and wear protective clothing, a wide-brimmed hat, and UV-blocking sunglasses. Generously apply broad spectrum SPF 30+ sunscreen every 2 hours, even on cloudy days. Watch out for relections from water that may increase ultraviolet exposure.
The wettest month in Ko Samui is November with 26.5cm (10.4inches) of rain and October has the most days of rain with 23 days with some rain, a very wet time to visit the beach.
The driest month in Ko Samui is February with 1.3cm (0.5inches) of rain and the least days of rain with 3 days with some rain, a very dry time to visit the beach.
The most humid month in Ko Samui is April with a dew point (an indicator of humidity) of 26°C (79°F) which is very uncomfortable and fairly oppressive unless you are on a beach. At night you would most likely require airconditioning.
The least humid month in Ko Samui is January with a dew point of 24°C (75°F) which is very uncomfortable and fairly oppressive unless you are on a beach. At night you would most likely require airconditioning.
Beaches recommended for you today, this weekend, in the next 2 weeks or in any month of the year.
Beaches recommended for you today, this weekend, in the next 2 weeks or in any month of the year.
