Last updated: March 2, 2024
The weather in Somerville, United States, during September is characterized by an average temperature of 27°C (81°F). Highs can soar to 37°C (98°F), while lows may dip to 16°C (61°F). Typically, the humidity level in Somerville throughout September hovers around 69%.
Minimum temperature
Average temperature
Maximum temperature
Humidity
In September, Somerville averages 125 mm (4.9 inches) of rainfall, typically over the course of 12 rainy days. The month enjoys an average of 12 hours 17 minutes of daylight, with the sun shining for approximately 9 hours 24 minutes each day. Additionally, there is a 53% probability of sunny days during this period.
Precipitation
Rainy days
Sunshine hours
Chance of sun
In September, the UV Index in Somerville reaches a maximum of 11, indicating a level of VeryHigh exposure. The most intense UV radiation typically occurs between 13:00 and 15:00, during which unprotected skin may burn in as little as 15 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 | 0 | 1 | 2 | 4 | 7 | 9 | 10 | 10 | 8 | 6 | 3 | 1 | 1 |
| Exposure | Low | Moderate | High | VeryHigh | High | Moderate | Low | ||||||
| Time to burn | 45 min | 30 min | 25 min | 15 min | 25 min | 30 min | 45 min | ||||||