Weather in Ko Samui, Thailand in September

So you're interested in going to Ko Samui, Thailand in September

September is a hot and very rainy time for sunbathing in Ko Samui. September is an excellent month for swimming in Ko Samui with very warm sea temperatures. Consider visiting Ko Samui in the months of January, February, March, April, for the best beach weather. Also consider one of our other suggestions for September.

Temperature in Ko Samui in September

The average maximum temperature in Ko Samui in September is 32°. The average maximum temperature is 32° in the previous month and 31° in the next month.

The average temperature in Ko Samui in September is 29°. The average temperature ranges is 29° in the previous month and 28° in the next month.

The average minimum temperature in Ko Samui in September is 27°. The minimum temperature is 27° in the previous month and 26° in the next month.

Sunshine in Ko Samui in September

The average day light hours per day in Ko Samui in September are 12.2 and there are 5.8 hours of sunshine per day on average during September making it a sunny month that is overcast at times.

The ultraviolet index in Ko Samui in September is typically 13.9 during September. 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.

Sea Temperature in Ko Samui in September

The average sea water temperature in Ko Samui in September is 29.1° which is very warm and ideal for relaxing and swimming for the whole day.

Rainfall in Ko Samui in September

The average total rainfall in Ko Samui in September is 18.8cm and on average there are 21 rainy days in September making it a very wet time to visit the beach.

Humidity in Ko Samui in September

The maximum dew point (an indicator of humidity) in Ko Samui in September is 25° which is very uncomfortable and fairly oppressive unless you are on a beach. At night you would most likely require airconditioning. The dew point is 25° in the previous month and 25° in the next month.

The average maximum relative humidity in Ko Samui in September is typically 86.4%. The maximum relative humidity is 85.2% in the previous month and 90.4% in the next month.

The average relative humidity in Ko Samui in September is typically 73.3%. The average relative humidity is 71.5% in the previous month and 78.1% in the next month.

Wind Speed in Ko Samui in September

The average maximum wind speed in Ko Samui in September is typically 24kmh. The average maximum wind speed is 24kmh in the previous month and 22kmh in the next month.

The average wind speed in Ko Samui in September is typically 12kmh. The average wind speed is 12kmh in the previous month and 10kmh in the next month.

The average wind direction in Ko Samui in September is from the West-Northwest.

Monthly Averages

Suggested Beaches in September

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