16-Day Forecast
Today
21 Oct
27°C
Daytime High
31°C sea
24°C
Overnight Low
☀☀☀○○
6h sun
1.7mm rain
Thu
22 Oct
28°C
Daytime High
31.1°C sea
24°C
Overnight Low
☀☀☀☀☀
11.7h sun
1.1mm rain
Fri
23 Oct
28°C
Daytime High
30.9°C sea
24°C
Overnight Low
☀☀☀☀☀
11.7h sun
1mm rain
Sat
24 Oct
27°C
Daytime High
30.7°C sea
21°C
Overnight Low
☀☀☀☀☀
11.3h sun
12.4mm rain
Sun
25 Oct
28°C
Daytime High
30.5°C sea
22°C
Overnight Low
☀☀☀☀☀
11.5h sun
9.5mm rain
Mon
26 Oct
26°C
Daytime High
30.4°C sea
21°C
Overnight Low
☀☀☀☀○
7.8h sun
3.6mm rain
Tue
27 Oct
26°C
Daytime High
30.6°C sea
21°C
Overnight Low
☀☀☀○○
5.8h sun
2.5mm rain
Wed
28 Oct
27°C
Daytime High
30.7°C sea
24°C
Overnight Low
☀☀☀☀☀
11.7h sun
2.8mm rain
Thu
29 Oct
26°C
Daytime High
30.9°C sea
22°C
Overnight Low
☀☀☀☀☀
10.4h sun
12.7mm rain
Fri
30 Oct
25°C
Daytime High
~30.5°C sea
22°C
Overnight Low
☀☀☀☀☀
10.4h sun
10.3mm rain
Sat
31 Oct
27°C
Daytime High
~30.5°C sea
24°C
Overnight Low
☀☀☀☀☀
11.7h sun
3mm rain
Sun
1 Nov
26°C
Daytime High
~29.7°C sea
22°C
Overnight Low
☀☀☀☀☀
11.4h sun
8.4mm rain
Mon
2 Nov
26°C
Daytime High
~29.7°C sea
23°C
Overnight Low
☀☀☀☀☀
11.4h sun
7.6mm rain
Tue
3 Nov
25°C
Daytime High
~29.7°C sea
22°C
Overnight Low
☀☀☀☀○
8.8h sun
10.4mm rain
Wed
4 Nov
26°C
Daytime High
~29.7°C sea
22°C
Overnight Low
☀☀☀☀☀
11.6h sun
6.3mm rain
Thu
5 Nov
26°C
Daytime High
~29.7°C sea
23°C
Overnight Low
☀☀☀☀☀
11.5h sun
0.8mm rain
☀ = 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.
