Somerville (MA) Weather & Climate: Best Time to Visit
Average temperatures, rainfall, sunshine and the best time to visit Somerville.
Climate overview of Somerville
The climate in Somerville, Massachusetts, United States of America, is marked by large temperature swings across the seasons, ranging from 29°C (84°F) in July to 3°C (37°F) in January.
The city has a wet climate, receiving around 1229 mm (48 in) of rain/snowfall per year. Despite the high annual total, it has warm summers and cold winters. December is the wettest month. The most sunshine falls in May, with an average of 10.0 hours of daily sunshine.
Somerville Weather by Month
Pick a month to see the average temperature, rainfall and sunshine in Somerville - and find the best time to visit.
Monthly Temperature in Somerville
In Somerville, temperatures differ significantly between summer and winter months. On average, daytime temperatures range from a comfortable 29°C (84°F) in July to a chilly 3°C (37°F) in January.
Nighttime temperatures range from 18°C (64°F) in July to -6°C (21°F) in January.
Check out our detailed temperature page for more information.
Temperature ranges by month
Rainfall in Somerville
Somerville experiences significant rain/snowfall throughout the year, averaging 1229 mm (48 in) of precipitation annually. The amount of precipitation varies moderately throughout the year. The wettest month, December, sees around 132 mm (5.2 in) of snow/rainfall, perfect for those who enjoy a bit of snow/rain now and then. The driest month, September, still receives a respectable 81 mm (3.2 in) of rainfall. For more details, please visit our Somerville Precipitation page.
The mean monthly precipitation over the year, including rain, hail, and snow
The average number of days each month with precipitation
Sunshine Hours in Somerville
In Somerville, summer days are longer and more sunny, with daily sunshine hours peaking at 10.0 hours in May. As the darker season arrives, the brightness of the sun becomes less. December sees a soft sun for only 4.7 hours per average day.
Visit our detailed sunshine hours page for more information.
Monthly hours of sunshine
Daily hours of sunshine
Daily percentage of sunshine
Water Temperature in Somerville
The mean water temperature over the year ranges from 4°C (39°F) in February to 20°C (68°F) in August.
Water temperature over the year
Humidity in Somerville by Month
The relative humidity is high throughout the year in Somerville.
The city experiences its highest humidity in August, reaching 72%. In February, the humidity drops to its lowest level at 62%. What does this mean? Read our detailed page on humidity levels for further details.
Relative humidity over the year
Wind Speed in Somerville
The mean wind speed over the year ranges from 5 m/s (10 knots) in June, July, August and September to 7 m/s (14 knots) in January, February, March and December. What does this mean?
The mean monthly wind speed over the year (meters per second)
Best Time to Visit Somerville
Monthly ratings reflect general weather comfort, based on daytime temperature and rainfall. Swimming and winter conditions are highlighted separately where relevant.
- Best overall: May, August and September
- Warmest weather: July and August
- Most sunshine: May and July
- Best for swimming: August, with water temperatures around 20°C (68°F).
- Seasonal pattern: Warm summers and cold winters
- Coldest conditions: January, with freezing nights around -6°C (21°F).
Frequently asked questions about the climate in Somerville
What is the best time to visit Somerville?
May, August and September typically offer the most optimal weather in Somerville. In contrast, January, February, March and December tend to have less optimal conditions. Somerville has warm summers and cold winters.
What temperatures can I expect in Somerville?
Daytime highs range from 3°C (37°F) in January to 29°C (84°F) in July. Nighttime lows range from -6°C (21°F) to 18°C (64°F). Temperatures vary considerably through the year.
How much rain does Somerville get?
Annual rainfall is around 1229 mm (48 in). December is the wettest month with 132 mm (5.2 in), while September is the driest with 81 mm (3.2 in). In the coldest months, precipitation may fall as snow/rain.
How sunny is Somerville?
Somerville receives around 2,665 hours of sunshine per year. May is the sunniest month with 301 hours, while December is the cloudiest with just 141 hours. Overall, Somerville enjoys abundant sunshine.
Somerville 3-Day Forecast
Somerville (MA) 3-Day Forecast
Somerville on the map
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