Last updated: March 2, 2024
The weather in Swansea, United Kingdom, during September is characterized by an average temperature of 15°C (60°F). Highs can soar to 21°C (71°F), while lows may dip to 10°C (50°F). Typically, the humidity level in Swansea throughout September hovers around 79%.
Minimum temperature
Average temperature
Maximum temperature
Humidity
In September, Swansea averages 120 mm (4.7 inches) of rainfall, typically over the course of 15 rainy days. The month enjoys an average of 12 hours 35 minutes of daylight, with the sun shining for approximately 10 hours 17 minutes each day. Additionally, there is a 28% probability of sunny days during this period.
Precipitation
Rainy days
Sunshine hours
Chance of sun
In September, the UV Index in Swansea 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 | ||||||||||