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August Weather in Somerville, United States

Last updated: June 24, 2025

In Somerville, United States, the average temperature in August is a warm 30°C (86°F), with temperatures ranging from a comfortable 21°C (70°F) to a scorching 40°C (104°F). Expect some rainfall, as 120 mm (4.7 in) of precipitation may occur over 9 days. Humidity hovers around 67%, adding to the tropical feel of the month.

August Temperature in Somerville

In August in Somerville, the average temperature is 30°C (86°F). Maximums can reach 40°C (104°F) and minimums can be as low as 21°C (70°F). Be prepared for warm weather and stay hydrated while exploring the area!

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 30°C (86°F), with highs reaching up to 40°C (104°F) and lows dropping to around 21°C (70°F).
JanFebMarAprMayJunJulAugSepOctNovDec535564697782848681726156
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 120 mm (4.7 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 120 mm (4.7 inches) of precipitation spread over approximately 9 days.
JanFebMarAprMayJunJulAugSepOctNovDec708170111166118961201259572103
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 67%. With an average temperature of 30°C (86°F), this humidity feels like a warm blanket enveloping you, making outdoor activities a bit sticky and challenging but still manageable with frequent breaks for hydration and shade.

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 67%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec80%80%78%79%81%77%71%67%69%73%82%87%
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 reaches 11, which corresponds to an extreme Exposure Category. With a time to burn of just 10 minutes, it's essential to take precautions. For more details, you can check 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 11, which falls under the extreme exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec589111112121111865
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 Weather12°C (53°F)70 mm (2.8 inches)79%moderate
February Weather13°C (55°F)81 mm (3.2 inches)80%very high
March Weather18°C (65°F)69 mm (2.7 inches)78%very high
April Weather20°C (69°F)111 mm (4.4 inches)79%extreme
May Weather25°C (77°F)166 mm (6.5 inches)81%extreme
June Weather28°C (83°F)118 mm (4.7 inches)77%extreme
July Weather29°C (85°F)96 mm (3.8 inches)71%extreme
August Weather30°C (86°F)120 mm (4.7 inches)67%extreme
September Weather27°C (81°F)125 mm (4.9 inches)69%extreme
October Weather22°C (72°F)95 mm (3.7 inches)73%very high
November Weather16°C (61°F)72 mm (2.8 inches)82%high
December Weather13°C (56°F)103 mm (4.0 inches)87%moderate

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