Last updated: March 2, 2024
The weather in Ko Samui, Thailand, during September is characterized by an average temperature of 28°C (82°F). Highs can soar to 30°C (86°F), while lows may dip to 26°C (79°F). Typically, the humidity level in Ko Samui throughout September hovers around 87%.
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Average temperature
Maximum temperature
Humidity
In September, Ko Samui averages 151 mm (5.9 inches) of rainfall, typically over the course of 21 rainy days. The month enjoys an average of 12 hours 9 minutes of daylight, with the sun shining for approximately 9 hours 31 minutes each day. Additionally, there is a 11% probability of sunny days during this period.
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Rainy days
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Chance of sun
In September, the UV Index in Ko Samui reaches a maximum of 14, indicating a level of Extreme exposure. The most intense UV radiation typically occurs between 12:00 and 14:00, during which unprotected skin may burn in as little as 10 minutes.
| 07:00 | 08:00 | 09:00 | 10:00 | 11:00 | 12:00 | 13:00 | 14:00 | 15:00 | 16:00 | 17:00 | 18:00 | 19:00 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| UVI | 1 | 3 | 6 | 9 | 12 | 14 | 13 | 10 | 7 | 3 | 1 | 1 | 0 |
| Exposure | Low | Moderate | High | VeryHigh | Extreme | VeryHigh | High | Moderate | Low | ||||
| Time to burn | 45 min | 30 min | 25 min | 15 min | 10 min | 15 min | 25 min | 30 min | 45 min | ||||