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May Weather in Somerville, United States

Last updated: June 24, 2025

In May, the average temperature in Somerville, United States is a pleasant 22°C (72°F). Temperatures can vary, with a minimum of 6°C (43°F) and a maximum soaring to 34°C (93°F). Expect 103 mm (4.0 in) of precipitation over 11 days, contributing to an average humidity of a steamy 83%.

May Temperature in Somerville

In May in Somerville, the average temperature is 22°C (72°F). Maximum temperatures can reach 34°C (93°F), while minimum temperatures can drop to as low as 6°C (43°F). This variety makes Somerville an ideal destination for travelers seeking both warm days and cooler evenings.

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

The chart illustrates May 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, May typically has an average temperature of 22°C (72°F), with highs reaching up to 34°C (93°F) and lows dropping to around 6°C (43°F).
JanFebMarAprMayJunJulAugSepOctNovDec444956627177807975665148
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.

May Precipitation in Somerville

In Somerville in May, the total precipitation amount is 103 mm (4.0 in), occurring over the course of 11 days.

May Precipitation Trends in Somerville

The chart displays monthly precipitation patterns in Somerville, with values for each month alongside May’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how May’s conditions compare to those of other months. In Somerville, May typically receives around 103 mm (4.0 inches) of precipitation spread over approximately 11 days.
JanFebMarAprMayJunJulAugSepOctNovDec11418019014810313811411411513075157
Data source: Precipitation data for May generated using information from the Copernicus Climate Change Service.
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May Humidity in Somerville

In Somerville in May humidity is 83%. With average temperature 22°C (72°F), this humidity feels like a heavy blanket wrapping around you, making outdoor activities challenging and prompting travelers to seek shade or frequent stops for hydration.

May Average Humidity in Somerville

This chart illustrates the average monthly humidity levels in Somerville, with May’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In May, average humidity in Somerville is approximately 83%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec87%87%85%82%83%82%78%67%64%75%87%89%
Data source: Humidity data for May generated using information from the Copernicus Climate Change Service.

May UV Index in Somerville

In Somerville in May, the maximum UV index reaches 10, which corresponds to a very high Exposure Category. With a time to burn of just 15 minutes, it's crucial to take precautions. For more detailed information, you can check the Hourly UV Index in Somerville.

Maximum UV Index Levels in Somerville for May

The chart shows the monthly maximum UV Index (UVI) for Somerville in May, 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 May, the maximum UV index in Somerville typically reaches 10, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec46810101111109764
Data source: Somerville May 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 May 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 May’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 May’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather7°C (44°F)114 mm (4.5 inches)87%moderate
February Weather10°C (50°F)180 mm (7.1 inches)87%high
March Weather13°C (56°F)190 mm (7.5 inches)85%very high
April Weather16°C (62°F)148 mm (5.8 inches)82%very high
May Weather22°C (72°F)103 mm (4.0 inches)83%very high
June Weather25°C (77°F)138 mm (5.4 inches)82%extreme
July Weather27°C (81°F)114 mm (4.5 inches)78%extreme
August Weather26°C (80°F)114 mm (4.5 inches)67%very high
September Weather24°C (76°F)115 mm (4.5 inches)64%very high
October Weather19°C (66°F)130 mm (5.1 inches)74%high
November Weather11°C (51°F)75 mm (2.9 inches)87%high
December Weather9°C (48°F)157 mm (6.2 inches)88%moderate

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