Island in Rayong, Thailand
Koh Samet weather by month and the best time to visit
When to go to Koh Samet
Nov–Mar is dry and sunny; Apr–May is hot. Samet gets less rain than most Thai islands, but Jun–Oct is still wet; weekends and holidays fill with Bangkokians.
Koh Samet weather by month
Average daily high, rainfall and conditions.
- Jan28°35 mm
- Feb29°25 mm
- Mar29°64 mm
- Apr30°91 mm
- May30°224 mm
- Jun29°290 mm
- Jul29°324 mm
- Aug29°293 mm
- Sep29°360 mm
- Oct29°252 mm
- Nov29°80 mm
- Dec29°27 mm
Monthly averages
| Month | High | Low | Rain | Humidity | Conditions |
|---|---|---|---|---|---|
| January | 28°C83°F | 25°C77°F | 35 mm | 72% | Pleasant |
| February | 29°C84°F | 26°C79°F | 25 mm | 75% | Pleasant |
| March | 29°C85°F | 27°C81°F | 64 mm | 77% | Pleasant |
| April | 30°C86°F | 28°C83°F | 91 mm | 77% | Pleasant |
| May | 30°C86°F | 29°C84°F | 224 mm | 79% | Rainy |
| June | 29°C85°F | 28°C83°F | 290 mm | 81% | Rainy |
| July | 29°C84°F | 28°C82°F | 324 mm | 82% | Very wet |
| August | 29°C84°F | 28°C82°F | 293 mm | 82% | Rainy |
| September | 29°C83°F | 27°C81°F | 360 mm | 82% | Very wet |
| October | 29°C84°F | 27°C81°F | 252 mm | 81% | Rainy |
| November | 29°C84°F | 26°C79°F | 80 mm | 77% | Pleasant |
| December | 29°C83°F | 25°C77°F | 27 mm | 73% | Pleasant |
Best months across Thailand
| Place | Best months | Warmest month |
|---|---|---|
| Bangkok | Nov–Feb | Mar (36°C) |
| Phuket | Nov–Mar | Mar (30°C) |
| Chiang Mai | Nov–Jan | Apr (37°C) |
| Koh Samui | Jan–Apr, Jul–Aug | May (30°C) |
| Krabi | Nov–Mar | Mar (31°C) |
| Koh Phi Phi | Nov–Mar | Apr (30°C) |
| Koh Phangan | Jan–Apr, Jul–Aug | May (27°C) |
| Pai | Nov–Feb | Apr (35°C) |
| Pattaya | Nov–Feb | Apr (31°C) |
| Koh Tao | Feb–Aug | May (29°C) |
| Patong | Nov–Apr | Mar (30°C) |
| Hua Hin | Nov–Mar | Apr (33°C) |
| Chiang Rai | Nov–Feb | Apr (35°C) |
| Ayutthaya | Nov–Feb | Mar (37°C) |
| Koh Lanta | Nov–Apr | Apr (29°C) |
| Railay | Nov–Mar | Mar (31°C) |
| Kanchanaburi | Nov–Feb | Apr (37°C) |
| Koh Chang | Nov–Feb | Apr (30°C) |
| Khao Lak | Nov–Mar | Mar (31°C) |
| Koh Samet | Nov–Mar | Apr (30°C) |
| Koh Lipe | Nov–Mar | Apr (30°C) |
| Khao Yai | Nov–Feb | Apr (34°C) |
| Khao Sok | Dec–Apr | Apr (32°C) |
| Sukhothai | Nov–Feb | Apr (38°C) |
| Hat Yai | Jan–Apr | Apr (31°C) |
| Kata Beach | Nov–Mar | Mar (30°C) |
| Jomtien | Nov–Feb | Apr (31°C) |
| Rawai | Nov–Mar | Mar (30°C) |
| Udon Thani | Nov–Feb | Apr (37°C) |
| Koh Kood | Nov–Mar | May (30°C) |
Quick answers
What is the best month to visit Koh Samet?
Nov–Mar. Nov–Mar is dry and sunny; Apr–May is hot. Samet gets less rain than most Thai islands, but Jun–Oct is still wet; weekends and holidays fill with Bangkokians.
When is the rainy season in Koh Samet?
Rain peaks in September with about 360 mm. Months with 150 mm or more: May–Oct.
What is the hottest month in Koh Samet?
April, with average highs of 30°C (86°F).
How cold does Koh Samet get?
The coolest nights are in December, averaging 25°C (77°F).
More about Koh Samet
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Sources
- NASA POWER climatology (2001–2020)
- Tourism Authority of Thailand: Rayong
- Thai National Parks (Khao Laem Ya–Mu Ko Samet)
- Bangkok Hospital Rayong
Climate averages are modelled from NASA POWER (MERRA-2) for 2001–2020 at about 50 km resolution, so coasts and valleys can differ a little. Compiled and reviewed by SoloSquare. How we compile and score this. Spotted something out of date? Tell us.