16-Day Forecast
Today
10 Jul
31°C
Daytime High
31.3°C sea
26°C
Overnight Low
☀☀☀☀☀
12.3h sun
Sat
11 Jul
31°C
Daytime High
31.2°C sea
25°C
Overnight Low
☀☀☀☀☀
11.8h sun
Sun
12 Jul
29°C
Daytime High
31°C sea
24°C
Overnight Low
☀☀☀☀☀
9.5h sun
Mon
13 Jul
26°C
Daytime High
30.7°C sea
23°C
Overnight Low
☀○○○○
1h sun
Tue
14 Jul
28°C
Daytime High
30.4°C sea
22°C
Overnight Low
☀☀☀☀○
8.3h sun
Wed
15 Jul
29°C
Daytime High
30.8°C sea
24°C
Overnight Low
☀☀☀☀☀
11.4h sun
Thu
16 Jul
28°C
Daytime High
30.8°C sea
24°C
Overnight Low
☀☀☀☀☀
10.1h sun
Fri
17 Jul
28°C
Daytime High
31°C sea
24°C
Overnight Low
☀☀☀☀○
8.9h sun
Sat
18 Jul
29°C
Daytime High
~30.7°C sea
24°C
Overnight Low
☀☀☀☀☀
12.5h sun
Sun
19 Jul
27°C
Daytime High
~30.7°C sea
24°C
Overnight Low
☀☀☀☀☀
12.5h sun
Mon
20 Jul
29°C
Daytime High
~30.7°C sea
24°C
Overnight Low
☀☀☀☀☀
9.7h sun
Tue
21 Jul
28°C
Daytime High
~30.7°C sea
24°C
Overnight Low
☀☀☀☀☀
10h sun
Wed
22 Jul
28°C
Daytime High
~30.7°C sea
23°C
Overnight Low
☀☀☀☀☀
10.4h sun
Thu
23 Jul
28°C
Daytime High
~30.7°C sea
23°C
Overnight Low
☀☀☀☀☀
10.9h sun
Fri
24 Jul
29°C
Daytime High
~30.7°C sea
23°C
Overnight Low
☀☀☀☀☀
11.7h sun
Sat
25 Jul
~28.7°C
Daytime High
~30.7°C sea
~23.6°C
Overnight Low
☀☀☀☀○
8.6h sun
hist. avg
☀ = sunshine score · °C high / low · hours of sunshine shown below
About Koh Samui
Koh Samui in Thailand stands as one of Southeast Asia's most captivating tropical island destinations, offering the perfect blend of pristine beaches, vibrant culture, and year-round sunshine that makes it an ideal choice for anyone seeking an unforgettable holiday. This crescent-shaped island, nestled in the Gulf of Thailand, has earned its reputation as a premier vacation spot thanks to its stunning natural beauty, world-class hospitality, and the kind of warm, welcoming atmosphere that keeps travelers returning year after year. Whether you're dreaming of lazy beach days, underwater adventures, or immersive cultural experiences, Koh Samui delivers the quintessential tropical holiday that many people envision when planning their escape from colder climates.
The climate in Koh Samui is consistently warm throughout the year, with summer temperatures averaging around 30°C during peak season and winter months settling at a pleasant 24°C. The sea temperature peaks at approximately 32°C, creating swimming conditions comparable to the warmest Mediterranean spots like southern Spain or the Canary Islands, yet with the added tropical character that makes Thailand truly special. The island experiences three distinct seasons, though even during the cooler months, temperatures remain warm enough for beach activities and water sports. Humidity is typically high year-round, characteristic of tropical climates, and brief afternoon showers are common though rarely spoil extended periods of sunshine. The consistent warmth means that holidays in Koh Samui suit everyone from families seeking reliable weather for children to couples desiring romantic beachside evenings, and solo travelers eager to enjoy water-based adventures.
The best time to visit Koh Samui weather-wise falls between December and September, when the island enjoys its warmest and sunniest conditions, making these months ideal for maximizing your beach time and outdoor activities. If planning holidays in Koh Samui specifically for the absolute peak sunshine and warmth, aim for the months between May and October when temperatures are at their highest. Getting to Koh Samui in Thailand is remarkably convenient, with direct flights available from Singapore, the United Arab Emirates, and Australia. Travelers from further afield will find efficient one-stop connections available from the United Kingdom, Ireland, Germany, Netherlands, France, New Zealand, South Africa, United States, Canada, and various Northern European destinations including Sweden, Denmark, Finland, Norway, and others. Once on the island, visitors can explore spectacular attractions including the iconic Big Buddha temple, relax at some of Asia's most beautiful beaches, indulge in authentic Thai cuisine at beachfront restaurants, and experience vibrant night markets. Adventure seekers can enjoy snorkeling, diving, kayaking, and jungle trekking, ensuring that Koh Samui offers something memorable for every type of traveler.
