Koh Samui weather in May 2025

The temperatures in Koh Samui during May are extremely high, between 28°C and hot as 30°C, drinking water regularly is advisable.

You can expect about 3 to 8 days of rain in Koh Samui during the month of May. It’s a good idea to bring along your umbrella so that you don’t get caught in poor weather.

Our weather forecast can give you a great sense of what weather to expect in Koh Samui in May 2025.

If you’re planning to visit Koh Samui in the near future, we highly recommend that you review the 14 day weather forecast for Koh Samui before you arrive.

Temperatures

30° / 28°

Rainy Days

Snowy Days

Dry Days

Rainfall

155

Sun Hours

11.3

Hrs

Sun	Mon	Tue	Wed	Thu	Fri	Sat
				1 34° /27°	2 33° /28°	3 33° /28°
4 34° /28°	5 34° /28°	6 34° /28°	7 33° /28°	8 34° /28°	9 33° /28°	10 33° /28°
11 34° /28°	12 34° /28°	13 34° /28°	14 34° /28°	15 33° /28°	16 33° /28°	17 34° /28°
18 34° /28°	19 34° /28°	20 34° /28°	21 33° /29°	22 33° /28°	23 33° /27°	24 33° /27°
25 33° /27°	26 34° /28°	27 33° /28°	28 32° /28°	29 32° /27°	30 32° /27°	31 32° /26°

Explore the weather in Koh Samui in other months

Koh Samui annual weather

Month	Temperatures	Rainy Days	Dry Days	Rainfall	Weather	More details
January	27° / 26°	8	23	326 mm	Good	Koh Samui in January
February	28° / 26°	3	25	87 mm	Perfect	Koh Samui in February
March	28° / 27°	5	26	178 mm	Perfect	Koh Samui in March
April	29° / 28°	7	23	171 mm	Ok	Koh Samui in April
May	30° / 28°	7	24	155 mm	Ok	Koh Samui in May
June	30° / 28°	9	21	184 mm	Ok	Koh Samui in June
July	29° / 27°	8	23	163 mm	Ok	Koh Samui in July
August	29° / 27°	8	23	150 mm	Ok	Koh Samui in August
September	29° / 27°	10	20	188 mm	Ok	Koh Samui in September
October	29° / 27°	14	17	368 mm	Ok	Koh Samui in October
November	29° / 27°	17	13	565 mm	Ok	Koh Samui in November
December	28° / 27°	11	20	368 mm	Good	Koh Samui in December

Temperatures in Koh Samui in May

Rain in Koh Samui in May

Weather in Koh Samui in May - FAQ

What is the average temperature in Koh Samui in May?

The average temperature in Koh Samui in May is 28/30° C.

What is the chance of rain in Koh Samui in May?

On average, there are 7 rainy days in Koh Samui during May.

Weather wise, is May a good time to visit Koh Samui?

The weather in Koh Samui in May is ok.

Can it snow in Koh Samui in May?

On average, there are 0 snowy days in Koh Samui in May.

More about the weather in Koh Samui