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Climate month by month
Official 30-year averages (1991–2020) measured by the Thai Meteorological Department at its Rayong station, 14 km from Koh Samet. Source (TMD, PDF)
| Month | Day / Night | Rainfall | Rainy days | Humidity | Years of data |
|---|---|---|---|---|---|
| January | 31.9°C / 22.2°C | 29 mm | 3 | 75% | 30 |
| February | 32.4°C / 24.5°C | 32 mm | 4 | 76% | 30 |
| March | 33.0°C / 26.4°C | 71 mm | 6 | 78% | 30 |
| April | 34.0°C / 27.3°C | 85 mm | 7 | 77% | 30 |
| May | 33.5°C / 27.3°C | 191 mm | 14 | 79% | 30 |
| June | 32.7°C / 27.0°C | 178 mm | 15 | 79% | 30 |
| July | 32.2°C / 26.8°C | 177 mm | 15 | 80% | 30 |
| August | 32.0°C / 26.6°C | 128 mm | 14 | 80% | 30 |
| September | 31.8°C / 25.7°C | 269 mm | 18 | 82% | 30 |
| October | 32.3°C / 24.7°C | 196 mm | 17 | 82% | 30 |
| November | 32.8°C / 23.7°C | 44 mm | 6 | 75% | 30 |
| December | 32.2°C / 22.1°C | 8 mm | 2 | 71% | 30 |
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