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Climate month by month
Official 30-year averages (1991–2020) measured by the Thai Meteorological Department at its Surat Thani station, 20 km from Surat Thani. Source (TMD, PDF)
| Month | Day / Night | Rainfall | Rainy days | Humidity | Years of data |
|---|---|---|---|---|---|
| January | 31.0°C / 22.1°C | 75 mm | 7 | 83% | 30 |
| February | 32.7°C / 21.8°C | 24 mm | 3 | 79% | 30 |
| March | 34.5°C / 22.8°C | 84 mm | 5 | 78% | 30 |
| April | 35.4°C / 23.9°C | 73 mm | 8 | 78% | 30 |
| May | 34.5°C / 24.3°C | 151 mm | 16 | 83% | 30 |
| June | 33.6°C / 23.9°C | 133 mm | 16 | 83% | 30 |
| July | 33.3°C / 23.7°C | 134 mm | 17 | 83% | 30 |
| August | 33.3°C / 23.6°C | 127 mm | 16 | 83% | 30 |
| September | 32.9°C / 23.6°C | 172 mm | 19 | 85% | 30 |
| October | 32.1°C / 23.6°C | 202 mm | 20 | 87% | 30 |
| November | 30.8°C / 23.4°C | 255 mm | 17 | 88% | 30 |
| December | 30.1°C / 22.7°C | 170 mm | 13 | 86% | 30 |
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