Last updated: March 2, 2024
The weather in Castlewellan, United Kingdom, during September is characterized by an average temperature of 13°C (56°F). Highs can soar to 19°C (66°F), while lows may dip to 7°C (45°F). Typically, the humidity level in Castlewellan throughout September hovers around 88%.
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Average temperature
Maximum temperature
Humidity
In September, Castlewellan averages 83 mm (3.3 inches) of rainfall, typically over the course of 16 rainy days. The month enjoys an average of 12 hours 38 minutes of daylight, with the sun shining for approximately 9 hours 49 minutes each day. Additionally, there is a 21% probability of sunny days during this period.
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Chance of sun
In September, the UV Index in Castlewellan reaches a maximum of 5, indicating a level of Moderate exposure. The most intense UV radiation typically occurs between 13:00 and 15:00, 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 | 1 | 2 | 3 | 4 | 5 | 5 | 4 | 3 | 2 | 1 | 1 |
| Exposure | Low | Moderate | Low | ||||||||||
| Time to burn | 45 min | 30 min | 45 min | ||||||||||