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Mainly clear

Koh Samui

Thailand

27.7°C

Avg 8.7 hrs sunshine/day

Sea temperature: 30.5°C

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.

Live forecast temporarily unavailable.

Showing historical averages for this time of year while we reconnect to the weather service.

16-Day Forecast

Today

4 Sept

Mainly clear

~27.7°C

Daytime High

30.5°C sea

~23°C

Overnight Low

☀☀☀☀

8.7h sun

hist. avg

Sat

5 Sept

Mainly clear

~27.7°C

Daytime High

30.5°C sea

~23°C

Overnight Low

☀☀☀☀

8.7h sun

hist. avg

Sun

6 Sept

Mainly clear

~27.7°C

Daytime High

30.4°C sea

~23°C

Overnight Low

☀☀☀☀

8.7h sun

hist. avg

Mon

7 Sept

Mainly clear

~27.7°C

Daytime High

30.4°C sea

~23°C

Overnight Low

☀☀☀☀

8.7h sun

hist. avg

Tue

8 Sept

Mainly clear

~27.7°C

Daytime High

30.4°C sea

~23°C

Overnight Low

☀☀☀☀

8.7h sun

hist. avg

Wed

9 Sept

Mainly clear

~27.7°C

Daytime High

30.3°C sea

~23°C

Overnight Low

☀☀☀☀

8.7h sun

hist. avg

Thu

10 Sept

Mainly clear

~27.7°C

Daytime High

30.1°C sea

~23°C

Overnight Low

☀☀☀☀

8.7h sun

hist. avg

Fri

11 Sept

Mainly clear

~27.7°C

Daytime High

29.9°C sea

~23°C

Overnight Low

☀☀☀☀

8.7h sun

hist. avg

Sat

12 Sept

Mainly clear

~27.7°C

Daytime High

29.7°C sea

~23°C

Overnight Low

☀☀☀☀

8.7h sun

hist. avg

Sun

13 Sept

Mainly clear

~27.7°C

Daytime High

~30.3°C sea

~23°C

Overnight Low

☀☀☀☀

8.7h sun

hist. avg

Mon

14 Sept

Mainly clear

~27.7°C

Daytime High

~30.3°C sea

~23°C

Overnight Low

☀☀☀☀

8.7h sun

hist. avg

Tue

15 Sept

Mainly clear

~27.7°C

Daytime High

~30.3°C sea

~23°C

Overnight Low

☀☀☀☀

8.7h sun

hist. avg

Wed

16 Sept

Mainly clear

~27.7°C

Daytime High

~30.3°C sea

~23°C

Overnight Low

☀☀☀☀

8.7h sun

hist. avg

Thu

17 Sept

Mainly clear

~27.7°C

Daytime High

~30.3°C sea

~23°C

Overnight Low

☀☀☀☀

8.7h sun

hist. avg

Fri

18 Sept

Mainly clear

~27.7°C

Daytime High

~30.3°C sea

~23°C

Overnight Low

☀☀☀☀

8.7h sun

hist. avg

Sat

19 Sept

Mainly clear

~27.7°C

Daytime High

~30.3°C sea

~23°C

Overnight Low

☀☀☀☀

8.7h sun

hist. avg

Sun

20 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.