September Weather in Somerville

Last updated: March 2, 2024

The weather in Somerville, United States, during September is characterized by an average temperature of 24°C (76°F). Highs can soar to 33°C (92°F), while lows may dip to 14°C (57°F). Typically, the humidity level in Somerville throughout September hovers around 64%.

14°C (57°F)

Minimum temperature

24°C (76°F)

Average temperature

33°C (92°F)

Maximum temperature

64%

Humidity

Precipitation and Sunshine hours

In September, Somerville averages 115 mm (4.5 inches) of rainfall, typically over the course of 9 rainy days. The month enjoys an average of 12 hours 20 minutes of daylight, with the sun shining for approximately 9 hours 25 minutes each day. Additionally, there is a 47% probability of sunny days during this period.

115 mm (4.5 inches)

Precipitation

9 rainy days

Rainy days

9 hours 25 minutes

Sunshine hours

47%

Chance of sun

UV Index

In September, the UV Index in Somerville reaches a maximum of 9, indicating a level of VeryHigh exposure. The most intense UV radiation typically occurs between 12:00 and 14:00, during which unprotected skin may burn in as little as 15 minutes.

Average solar exposure data for the current time of the year. Actual values may vary and depend on many factors, such as cloud cover, vegetation cover, surface type, etc.
  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 3 5 8 9 9 8 6 4 2 1 1
Exposure Low Moderate VeryHigh High Moderate Low
Time to burn 45 min 30 min 15 min 25 min 30 min 45 min

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