Last updated: March 2, 2024
The weather in Porthleven, United Kingdom, during September is characterized by an average temperature of 16°C (60°F). Highs can soar to 20°C (68°F), while lows may dip to 11°C (52°F). Typically, the humidity level in Porthleven throughout September hovers around 84%.
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Average temperature
Maximum temperature
Humidity
In September, Porthleven averages 64 mm (2.5 inches) of rainfall, typically over the course of 12 rainy days. The month enjoys an average of 12 hours 33 minutes of daylight, with the sun shining for approximately 11 hours 0 minutes each day. Additionally, there is a 33% probability of sunny days during this period.
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In September, the UV Index in Porthleven 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 | ||||||||||