Last updated: March 2, 2024
The weather in St Martin, Guernsey, during September is characterized by an average temperature of 17°C (62°F). Highs can soar to 20°C (69°F), while lows may dip to 13°C (56°F). Typically, the humidity level in St Martin throughout September hovers around 76%.
Minimum temperature
Average temperature
Maximum temperature
Humidity
In September, St Martin averages 63 mm (2.5 inches) of rainfall, typically over the course of 9 rainy days. The month enjoys an average of 12 hours 32 minutes of daylight, with the sun shining for approximately 11 hours 16 minutes each day. Additionally, there is a 43% probability of sunny days during this period.
Precipitation
Rainy days
Sunshine hours
Chance of sun
In September, the UV Index in St Martin reaches a maximum of 6, indicating a level of Moderate exposure. The most intense UV radiation typically occurs between 12:00 and 14:00, during which unprotected skin may burn in as little as 30 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 | 1 | 2 | 3 | 4 | 5 | 5 | 5 | 4 | 3 | 2 | 1 | 1 |
| Exposure | Low | Moderate | Low | ||||||||||
| Time to burn | 45 min | 30 min | 45 min | ||||||||||