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Climate month by month
Official 30-year averages (1991–2020) measured by the Thai Meteorological Department at its Ko Samui station, 73 km from Koh Tao. Source (TMD, PDF)
| Month | Day / Night | Rainfall | Rainy days | Humidity | Years of data |
|---|---|---|---|---|---|
| January | 29.0°C / 24.2°C | 127 mm | 11 | 83% | 30 |
| February | 29.4°C / 24.9°C | 64 mm | 6 | 81% | 30 |
| March | 30.4°C / 25.4°C | 116 mm | 6 | 81% | 30 |
| April | 31.8°C / 26.0°C | 83 mm | 8 | 81% | 30 |
| May | 32.9°C / 25.7°C | 132 mm | 14 | 80% | 30 |
| June | 32.7°C / 25.3°C | 134 mm | 13 | 78% | 30 |
| July | 32.3°C / 25.1°C | 117 mm | 14 | 78% | 30 |
| August | 32.4°C / 25.1°C | 102 mm | 15 | 78% | 30 |
| September | 31.9°C / 24.8°C | 118 mm | 15 | 80% | 30 |
| October | 30.6°C / 24.3°C | 295 mm | 19 | 85% | 30 |
| November | 29.7°C / 24.1°C | 445 mm | 19 | 86% | 30 |
| December | 29.3°C / 24.0°C | 263 mm | 14 | 83% | 30 |
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