Ko Samui, Thailand: Annual Weather Averages
May is the hottest month in Ko Samui with an average temperature of 29.5°C (85°F) and the coldest is January at 26°C (79°F) with the most daily sunshine hours at 8 in April. The wettest month is November with an average of 430mm of rain. The best month to swim in the sea is in April when the average sea temperature is 28°C (82°F).
Average Temperature: Ko Samui
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| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| °C | 26 | 27 | 29 | 29 | 30 | 29 | 29 | 29 | 28 | 27 | 27 | 27 |
| °F | 79 | 81 | 83 | 84 | 85 | 84 | 83 | 83 | 82 | 81 | 80 | 80 |
Average High/Low Temperature: Ko Samui
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| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| High °C | 28 | 29 | 31 | 32 | 33 | 32 | 32 | 32 | 31 | 30 | 29 | 29 |
| Low °C | 24 | 25 | 26 | 26 | 26 | 26 | 25 | 25 | 25 | 24 | 24 | 24 |
| High °F | 82 | 84 | 88 | 90 | 91 | 90 | 90 | 90 | 88 | 86 | 84 | 84 |
| Low °F | 75 | 77 | 79 | 79 | 79 | 79 | 77 | 77 | 77 | 75 | 75 | 75 |
Average Day/Night Temperature: Ko Samui
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| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Day °C | 28 | 28 | 30 | 30 | 30 | 30 | 29 | 29 | 29 | 28 | 28 | 28 |
| Night °C | 26 | 27 | 28 | 29 | 28 | 28 | 28 | 27 | 27 | 27 | 27 | 26 |
| Day °F | 82 | 83 | 85 | 86 | 86 | 85 | 84 | 84 | 83 | 83 | 82 | 82 |
| Night °F | 79 | 80 | 83 | 83 | 83 | 82 | 82 | 81 | 81 | 81 | 80 | 79 |
Average Rainfall: Ko Samui
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| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| mm | 90 | 30 | 30 | 80 | 160 | 100 | 120 | 100 | 130 | 290 | 430 | 150 |
| Days | 7 | 5 | 4 | 5 | 9 | 9 | 9 | 10 | 11 | 16 | 15 | 9 |
Average Daily Sunshine Hours: Ko Samui
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| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Hours | 7 | 8 | 8 | 8 | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 7 |
Average Sea Temperature: Ko Samui
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| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| °C | 26 | 27 | 27 | 28 | 28 | 28 | 28 | 28 | 28 | 27 | 27 | 27 |
| °F | 79 | 81 | 81 | 82 | 82 | 82 | 82 | 82 | 82 | 81 | 81 | 81 |
