Best Time to Visit Ko Samui
Thailand · weather by month, temperature and rainfall
Weather-wise, February is the best time to visit Ko Samui. Temperatures barely change through the year: highs stay between 28°C and 30°C, so rainfall matters far more than heat when choosing when to go. The rainy season runs over October to December; November is the wettest month with about 424 mm (16.7 in) of rain. June is the least comfortable month, mainly because of the rain.
Ko Samui weather by month
Monthly climate table
| Month | High | Low | Rain | Rainy days | Humidity | Sun hrs/day | Rating |
|---|---|---|---|---|---|---|---|
| January | 28°C 82°F | 26°C 79°F | 136 mm | 14 | 79% | 4.7 | Fair 5.8 |
| February | 28°C 82°F | 27°C 80°F | 55 mm | 7 | 79% | 6.9 | Excellent 8.9 |
| March | 29°C 84°F | 27°C 81°F | 97 mm | 9 | 78% | 6.7 | Good 7.3 |
| April | 30°C 86°F | 28°C 83°F | 101 mm | 14 | 76% | 4.4 | Fair 5.7 |
| May | 30°C 86°F | 29°C 83°F | 181 mm | 27 | 77% | 1.8 | Poor 2.8 |
| June | 30°C 85°F | 28°C 82°F | 164 mm | 25 | 79% | 1.7 | Poor 2.7 |
| July | 29°C 85°F | 28°C 82°F | 183 mm | 27 | 80% | 1.2 | Poor 2.7 |
| August | 29°C 84°F | 27°C 81°F | 154 mm | 26 | 80% | 1.5 | Poor 2.9 |
| September | 29°C 84°F | 27°C 81°F | 183 mm | 27 | 80% | 1.2 | Poor 3 |
| October | 29°C 83°F | 27°C 81°F | 252 mm | 28 | 81% | 1.6 | Poor 3.2 |
| November | 28°C 83°F | 27°C 81°F | 424 mm | 26 | 81% | 2 | Poor 3.4 |
| December | 28°C 82°F | 27°C 80°F | 286 mm | 19 | 80% | 2.8 | Poor 4.1 |
Frequently asked questions
When is the best time to visit Ko Samui?
The best time to visit Ko Samui is February, based on comfortable temperatures, low rainfall and plenty of sunshine.
What is the hottest month in Ko Samui?
May is the hottest month in Ko Samui, with an average high of 30°C (86°F).
What is the coldest month in Ko Samui?
January is the coldest month in Ko Samui, with an average low of 26°C (79°F).
What is the rainiest month in Ko Samui?
November is the wettest month, with about 424 mm (16.7 in) of rain. February is the driest, with 55 mm (2.2 in).
When is the rainy season in Ko Samui?
The rainy season in Ko Samui is October to December.
Nearby destinations
- Krabi198 km · best February
- Phuket249 km · best February
- Hua Hin337 km · best December and January
- Pattaya392 km · best December to February
- George Town461 km · best February
- Bangkok473 km · best December
- Phnom Penh589 km · best December
- Siem Reap603 km · best December
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