Last updated: March 2, 2024
The weather in Derry, United Kingdom, during September is characterized by an average temperature of 13°C (55°F). Highs can soar to 20°C (69°F), while lows may dip to 5°C (42°F). Typically, the humidity level in Derry throughout September hovers around 88%.
Minimum temperature
Average temperature
Maximum temperature
Humidity
In September, Derry averages 85 mm (3.4 inches) of rainfall, typically over the course of 17 rainy days. The month enjoys an average of 12 hours 39 minutes of daylight, with the sun shining for approximately 9 hours 14 minutes each day. Additionally, there is a 17% probability of sunny days during this period.
Precipitation
Rainy days
Sunshine hours
Chance of sun
In September, the UV Index in Derry 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 | ||||||||||