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August Weather in Somerville, United States

Last updated: June 24, 2025

In August, the average temperature in Somerville, United States hovers around 21°C (70°F). You can expect a minimum of 8°C (46°F) and a maximum reaching as high as 34°C (94°F). With an average humidity of 74%, prepare for a notably humid atmosphere. Additionally, anticipate approximately 77 mm (3.0 in) of precipitation over 9 days throughout the month.

August Temperature in Somerville

In August in Somerville, the average temperature is 21°C (70°F). Maximums can reach 34°C (94°F) and minimums can be as low as 8°C (46°F). This variation in weather makes it essential for travelers to pack both light clothing for the warmth and layers for cooler evenings.

August Weather in Somerville: Daily Temperature Highs, Lows, and Averages

The chart illustrates August temperature patterns in Somerville, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Somerville, August typically has an average temperature of 21°C (70°F), with highs reaching up to 34°C (94°F) and lows dropping to around 8°C (46°F).
JanFebMarAprMayJunJulAugSepOctNovDec242632445465707062513828
Data source: Temperature data for Somerville generated using information from the Copernicus Climate Change Service.
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The average of daily temperatures (24 hours) calculated across all days in the month.

August Precipitation in Somerville

In Somerville in August, the precipitation amount is 77 mm (3.0 in) over the course of 9 days.

August Precipitation Trends in Somerville

The chart displays monthly precipitation patterns in Somerville, with values for each month alongside August’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how August’s conditions compare to those of other months. In Somerville, August typically receives around 77 mm (3.0 inches) of precipitation spread over approximately 9 days.
JanFebMarAprMayJunJulAugSepOctNovDec88877212481641057773129109121
Data source: Precipitation data for August generated using information from the Copernicus Climate Change Service.
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August Humidity in Somerville

In Somerville in August humidity is 74%. With an average temperature of 21°C (70°F), this humidity feels like a warm, moist embrace, making outdoor activities both invigorating and slightly draining, so travelers should stay hydrated and take breaks often.

August Average Humidity in Somerville

This chart illustrates the average monthly humidity levels in Somerville, with August’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In August, average humidity in Somerville is approximately 74%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec88%88%85%81%76%74%74%74%77%82%85%84%
Data source: Humidity data for August generated using information from the Copernicus Climate Change Service.

August UV Index in Somerville

In Somerville in August, the maximum UV index is 8, which corresponds to a very high Exposure Category. This means that the time to burn is only 15 minutes. For more detailed information, you can refer to the Hourly UV Index in Somerville.

Maximum UV Index Levels in Somerville for August

The chart shows the monthly maximum UV Index (UVI) for Somerville in August, representing the highest UV radiation level. The UVI measures the intensity of ultraviolet radiation from the sun, indicating the potential risk of sunburn and UV-related health issues. In August, the maximum UV index in Somerville typically reaches 8, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec2457910987532
Data source: Somerville August UVI data generated using information from the Copernicus Climate Change Service.

UV Risk Categories

  •  Extreme (11+): Avoid the sun, stay in shade.
  •  Very High (8-10): Limit sun exposure.
  •  High (6-7): Use SPF 30+ and protective clothing.
  •  Moderate (3-5): Midday shade recommended.
  •  Low (0-2): No protection needed.

How August Weather in Somerville Compares to Other Months

Weather in Somerville varies notably across the year, with each month offering distinct climate conditions. This page compares August’s weather to other months in Somerville, focusing on differences in temperature, rainfall, humidity, and UV levels.

This table compares monthly weather conditions in Somerville, showing how August’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-4°C (25°F)88 mm (3.5 inches)88%low
February Weather-3°C (26°F)86 mm (3.4 inches)88%moderate
March Weather0°C (33°F)72 mm (2.8 inches)85%moderate
April Weather7°C (44°F)124 mm (4.9 inches)81%high
May Weather12°C (55°F)80 mm (3.2 inches)76%very high
June Weather18°C (65°F)64 mm (2.5 inches)74%very high
July Weather21°C (71°F)105 mm (4.1 inches)74%very high
August Weather21°C (70°F)77 mm (3.0 inches)74%very high
September Weather17°C (63°F)73 mm (2.9 inches)77%high
October Weather11°C (52°F)129 mm (5.1 inches)82%moderate
November Weather3°C (38°F)109 mm (4.3 inches)85%moderate
December Weather-2°C (28°F)121 mm (4.8 inches)84%low

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