Showing historical averages for this time of year while we reconnect to the weather service.
16-Day Forecast
Today
4 Sept
~27.7°C
Daytime High
30.5°C sea
~23°C
Overnight Low
☀☀☀☀○
8.7h sun
hist. avg
Sat
5 Sept
~27.7°C
Daytime High
30.5°C sea
~23°C
Overnight Low
☀☀☀☀○
8.7h sun
hist. avg
Sun
6 Sept
~27.7°C
Daytime High
30.4°C sea
~23°C
Overnight Low
☀☀☀☀○
8.7h sun
hist. avg
Mon
7 Sept
~27.7°C
Daytime High
30.4°C sea
~23°C
Overnight Low
☀☀☀☀○
8.7h sun
hist. avg
Tue
8 Sept
~27.7°C
Daytime High
30.4°C sea
~23°C
Overnight Low
☀☀☀☀○
8.7h sun
hist. avg
Wed
9 Sept
~27.7°C
Daytime High
30.3°C sea
~23°C
Overnight Low
☀☀☀☀○
8.7h sun
hist. avg
Thu
10 Sept
~27.7°C
Daytime High
30.1°C sea
~23°C
Overnight Low
☀☀☀☀○
8.7h sun
hist. avg
Fri
11 Sept
~27.7°C
Daytime High
29.9°C sea
~23°C
Overnight Low
☀☀☀☀○
8.7h sun
hist. avg
Sat
12 Sept
~27.7°C
Daytime High
29.7°C sea
~23°C
Overnight Low
☀☀☀☀○
8.7h sun
hist. avg
Sun
13 Sept
~27.7°C
Daytime High
~30.3°C sea
~23°C
Overnight Low
☀☀☀☀○
8.7h sun
hist. avg
Mon
14 Sept
~27.7°C
Daytime High
~30.3°C sea
~23°C
Overnight Low
☀☀☀☀○
8.7h sun
hist. avg
Tue
15 Sept
~27.7°C
Daytime High
~30.3°C sea
~23°C
Overnight Low
☀☀☀☀○
8.7h sun
hist. avg
Wed
16 Sept
~27.7°C
Daytime High
~30.3°C sea
~23°C
Overnight Low
☀☀☀☀○
8.7h sun
hist. avg
Thu
17 Sept
~27.7°C
Daytime High
~30.3°C sea
~23°C
Overnight Low
☀☀☀☀○
8.7h sun
hist. avg
Fri
18 Sept
~27.7°C
Daytime High
~30.3°C sea
~23°C
Overnight Low
☀☀☀☀○
8.7h sun
hist. avg
Sat
19 Sept
~27.7°C
Daytime High
~30.3°C sea
~23°C
Overnight Low
☀☀☀☀○
8.7h sun
hist. avg
Sun
20 Sept
~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.
