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Heavy drizzle

Koh Samui

Thailand

29°C

Tomorrow's high

23°C Tomorrow night's low

Drizzle

It is currently night time there

Sunrise: 06:11Sunset: 18:269pm: 24°C

Sea temperature: 30.7°C

Humidity: 96%Rain: 5.9mm

We Say

Picture yourself surrendering to the golden embrace of Koh Samui's endless sunshine, where crystalline waters and swaying palms conspire to melt away every worry. This island sanctuary doesn't just welcome you—it wraps you in its radiant warmth like an old friend you've been aching to see again.

16-Day Forecast

Tue

8 Sept

Rain showers

30°C

Daytime High

30.7°C sea

23°C

Overnight Low

☀☀☀☀☀

11h sun

7.8mm rain

Wed

9 Sept

Thunderstorm

29°C

Daytime High

30.7°C sea

23°C

Overnight Low

☀☀☀☀☀

10.7h sun

5.9mm rain

Thu

10 Sept

Thunderstorm

26°C

Daytime High

30.6°C sea

22°C

Overnight Low

☀☀☀○○

5.6h sun

29mm rain

Fri

11 Sept

Rain showers

25°C

Daytime High

30.3°C sea

22°C

Overnight Low

☀☀○○○

3h sun

28mm rain

Sat

12 Sept

Thunderstorm

24°C

Daytime High

29.9°C sea

22°C

Overnight Low

○○○○

1.3h sun

22.4mm rain

Sun

13 Sept

Rain showers

27°C

Daytime High

29.6°C sea

22°C

Overnight Low

☀☀☀○○

5.7h sun

25.9mm rain

Mon

14 Sept

Heavy drizzle

27°C

Daytime High

29.4°C sea

23°C

Overnight Low

☀☀☀☀☀

11.8h sun

7.8mm rain

Tue

15 Sept

Thunderstorm

27°C

Daytime High

29.2°C sea

23°C

Overnight Low

☀☀☀☀☀

11.3h sun

15.4mm rain

Wed

16 Sept

Rain showers

24°C

Daytime High

~30.3°C sea

22°C

Overnight Low

○○○○

0.4h sun

25.6mm rain

Thu

17 Sept

Rain showers

23°C

Daytime High

~30.3°C sea

23°C

Overnight Low

○○○○○

17.8mm rain

Fri

18 Sept

Heavy drizzle

26°C

Daytime High

~30.3°C sea

22°C

Overnight Low

☀☀☀○○

5.8h sun

10.4mm rain

Sat

19 Sept

Heavy drizzle

27°C

Daytime High

~30.3°C sea

23°C

Overnight Low

☀☀☀☀☀

11.8h sun

8mm rain

Sun

20 Sept

Light drizzle

26°C

Daytime High

~30.3°C sea

22°C

Overnight Low

☀☀☀☀☀

11.8h sun

13mm rain

Mon

21 Sept

Light drizzle

26°C

Daytime High

~30.3°C sea

23°C

Overnight Low

☀☀☀☀☀

11.4h sun

12.4mm rain

Tue

22 Sept

Light drizzle

26°C

Daytime High

~30.3°C sea

23°C

Overnight Low

☀☀☀☀☀

9.7h sun

0.9mm rain

Wed

23 Sept

Mainly clear

~27.7°C

Daytime High

~30.3°C sea

~23°C

Overnight Low

☀☀☀☀

8.7h sun

hist. avg

☀ = sunshine score · °C high / low · hours of sunshine shown below

About Koh Samui

Koh Samui in Thailand stands out as one of Southeast Asia's most captivating tropical destinations, offering the perfect blend of pristine beaches, vibrant culture, and reliable sunshine that keeps holidaymakers returning year after year. This crescent-shaped island delivers the kind of immersive tropical experience that appeals equally to couples seeking romantic getaways, families looking for diverse activities, and solo travellers eager to explore everything from serene temples to bustling night markets. With crystal-clear waters meeting powder-soft sand and lush coconut palms creating postcard-perfect scenery, Koh Samui weather ensures you'll spend more time enjoying outdoor adventures than sheltering from the elements.

The climate in Koh Samui, Thailand maintains warm, inviting conditions throughout most of the year, with average summer temperatures reaching around 30°C during the peak season, while winters offer pleasantly mild conditions averaging around 24°C. The sea temperature peaks at approximately 32°C, making for gloriously refreshing swims and exceptional conditions for water sports enthusiasts. To put this in perspective, Koh Samui's weather rivals the Mediterranean heat of southern Europe but with the added benefit of reliably tropical waters and year-round greenery, as the island rarely experiences the cool, dry winters of European destinations.

The best time to visit Koh Samui spans from December through April, when the island experiences its warmest and sunniest conditions with minimal rainfall and calm seas. This period coincides with the Northern Hemisphere winter, making it an ideal escape route for those seeking reliable sunshine and perfect beach conditions. During these months, holidays in Koh Samui offer consistently beautiful weather that supports everything from snorkelling and diving expeditions to leisurely beach days.

Activities across Koh Samui cater to every interest, whether you're temple hopping at the iconic Big Buddha statue, indulging in world-class Thai cuisine at beachfront restaurants, enjoying water sports like paddleboarding and jet skiing, or exploring the island's natural attractions including scenic waterfalls and jungle trails. The vibrant nightlife, wellness retreats, and thriving food scene ensure your Koh Samui holiday remains engaging beyond beach hours.

Getting to Koh Samui is remarkably convenient with direct flights available from Singapore, the UAE, and Australia. Travellers from Europe, North America, and beyond can connect easily through major hubs, with one-stop connections available from the United Kingdom, Ireland, Germany, Netherlands, France, and numerous other countries worldwide, making this Thailand destination accessible from virtually anywhere globally.

Typical rainfall & humidity in Koh Samui

Jan

66.8mm · 77%

Feb

83.5mm · 77%

Mar

40mm · 76%

Apr

56.1mm · 74%

May

119.4mm · 78%

Jun

77.6mm · 75%

Jul

124.6mm · 77%

Aug

125.8mm · 77%

Sep

127.2mm · 79%

Oct

234.8mm · 83%

Nov

301.5mm · 84%

Dec

182.5mm · 81%

Average monthly rainfall and relative humidity, based on the last 3 years of historical data.

Koh Samui Weather & Holidays — Sunshine Holiday