Somerville Weather in September

September in Somerville brings high temperatures, with highs of 24°C (75°F) and nights dropping to 13°C (55°F). It's also the driest month of the year, ideal for those who want to avoid rain.

Rainfall in Somerville in September

With the driest weather of the year, this month is ideal for outdoor fun. Records from the past 30 years suggest around 9 days of rain, with 81 mm (3.2 in) average for the month. Individual showers can be quite heavy this month. A proper umbrella or rain jacket is worth having.

Temperature in Somerville in September

September is a excellent month in Somerville, with 24°C (75°F) during the day and 13°C (55°F) at night. This kind of day-to-night contrast is typical for this time of year. With overnight lows of 13°C (55°F), evenings can feel noticeably cooler than the daytime. An extra layer is a good idea, though the cool air makes for a good night's sleep.

Sunshine in Somerville in September

The city usually sees around 238 hours of sunlight, indicating many sunny days — a great month for sightseeing.

Wind Speed in Somerville in September

Wind speeds average 5 m/s (10 knots) during September. At this speed, gentle to moderate breezes make small trees sway and the wind creates whitecaps on water bodies. Daily variations range from moderate winds to stronger breezes, creating excellent conditions for sailing, kite flying and wind sports.

Average water temperature in September

With water at 18°C (64°F), swimming is comfortable for most people. It feels refreshing rather than cold, though it depends a bit on personal preference.

If your ideal day consists of dry skies and pleasant temperatures, May, August and September typically offer the best circumstances for Somerville.

Select a Month

Check the conditions for any month of the year.

• January
• February
• March
• April

• May
• June
• July
• August

• September
• October
• November
• December

For a detailed overview over the year and the best time to visit the United States of America, check out our Somerville's climate page.

Somerville Temperature in September

Min Temperature 13°C (55°F)  

Max Temperature 24°C (75°F)  

Water Temperature 18°C (64°F) *  

Chance of Rain 30%  

Precipitation 81 mm (3.2 in)  

Rainy days 9 days  

Humidity 69% *  

Windspeed 5 m/s (10 knots) *  

Sunshine 238 hours *  

Percentage Sunshine 63% *  

* Data from: Boston, the United States of America (5 KM, 3 Miles).

What to Wear in Somerville in September

For Somerville in September, you'll want flexible clothing. It's wise to pack cotton shirts, comfortable shorts, and a pair of jeans for cooler evenings. A light sweater or jacket is useful for air-conditioned spaces (like buses) or unexpected cool moments. High rain levels are expected, so pack waterproof gear and an umbrella or poncho. With water temperatures around 18°C (64°F), the water is quite cold for swimming. You can skip the swimwear unless you're particularly tough. And with plenty of sunshine hours, don’t forget sunglasses, sunscreen, and maybe a sun hat.

What To Do in Somerville in September

We rated the following activities from 1 (least suitable) to 10 (best) to do.

Swimming

9/10

Cycling

9/10

Walking

9/10

Barbeque

8/10

Camping

8/10

Outdoor sports

9/10

Select a Month

Check the conditions for any month of the year.

• January
• February
• March
• April

• May
• June
• July
• August

• September
• October
• November
• December

For a detailed overview over the year and the best time to visit the United States of America, check out our Somerville's climate page.

More climate data for Somerville

Temperature Rainfall Sunshine Humidity Wind Speed Water Temp

See the full Somerville climate overview or explore weather in the United States of America.