National Weather Service Forecast for: Somerville MA
Issued by: National Weather Service Norton, MA
Updated: 2:31 am EDT Aug 20, 2026
 
Today

Today: Increasing clouds, with a high near 87. Northwest wind around 5 mph becoming calm in the morning.
Increasing
Clouds
 Tonight

Tonight: Showers likely, mainly between 10pm and 11pm. Mostly cloudy, with a low around 64. Northwest wind around 6 mph becoming calm after midnight. Chance of precipitation is 60%. New precipitation amounts between a tenth and quarter of an inch possible.
Showers
Likely
 Friday

Friday: A chance of showers, mainly after 5pm. Partly sunny, with a high near 79. Northeast wind 5 to 9 mph. Chance of precipitation is 30%. New precipitation amounts of less than a tenth of an inch possible.
Chance
Showers
 Friday
Night
Friday Night: A slight chance of showers before 9pm, then a chance of showers after 10pm. Mostly cloudy, with a low around 64. East wind around 5 mph becoming calm in the evening. Chance of precipitation is 40%. New precipitation amounts of less than a tenth of an inch possible.
Chance
Showers
 Saturday

Saturday: Showers, with thunderstorms also possible after 5pm. Some of the storms could produce heavy rainfall. High near 75. Northeast wind 7 to 10 mph. Chance of precipitation is 90%.
Heavy Rain

 Saturday
Night
Saturday Night: Showers and possibly a thunderstorm before 11pm, then a chance of showers. Low around 64. Northeast wind around 5 mph becoming calm in the evening. Chance of precipitation is 80%.
Showers then
Chance
Showers
 Sunday

Sunday: A chance of showers after 8am. Mostly cloudy, with a high near 82. Light and variable wind becoming south around 6 mph in the morning. Chance of precipitation is 50%.
Chance
Showers
 Sunday
Night
Sunday Night: A chance of showers before 11pm. Mostly cloudy, with a low around 66. Light south wind. Chance of precipitation is 40%.
Chance
Showers then
Mostly Cloudy
 Monday

Monday: Mostly sunny, with a high near 83. West wind 5 to 9 mph.
Mostly Sunny
Hi 87 °F Lo 64 °F Hi 79 °F Lo 64 °F Hi 75 °F Lo 64 °F Hi 82 °F Lo 66 °F Hi 83 °F

 

Today
 
 Increasing clouds, with a high near 87. Northwest wind around 5 mph becoming calm in the morning.
Tonight
 
 Showers likely, mainly between 10pm and 11pm. Mostly cloudy, with a low around 64. Northwest wind around 6 mph becoming calm after midnight. Chance of precipitation is 60%. New precipitation amounts between a tenth and quarter of an inch possible.
Friday
 
 A chance of showers, mainly after 5pm. Partly sunny, with a high near 79. Northeast wind 5 to 9 mph. Chance of precipitation is 30%. New precipitation amounts of less than a tenth of an inch possible.
Friday Night
 
 A slight chance of showers before 9pm, then a chance of showers after 10pm. Mostly cloudy, with a low around 64. East wind around 5 mph becoming calm in the evening. Chance of precipitation is 40%. New precipitation amounts of less than a tenth of an inch possible.
Saturday
 
 Showers, with thunderstorms also possible after 5pm. Some of the storms could produce heavy rainfall. High near 75. Northeast wind 7 to 10 mph. Chance of precipitation is 90%.
Saturday Night
 
 Showers and possibly a thunderstorm before 11pm, then a chance of showers. Low around 64. Northeast wind around 5 mph becoming calm in the evening. Chance of precipitation is 80%.
Sunday
 
 A chance of showers after 8am. Mostly cloudy, with a high near 82. Light and variable wind becoming south around 6 mph in the morning. Chance of precipitation is 50%.
Sunday Night
 
 A chance of showers before 11pm. Mostly cloudy, with a low around 66. Light south wind. Chance of precipitation is 40%.
Monday
 
 Mostly sunny, with a high near 83. West wind 5 to 9 mph.
Monday Night
 
 Mostly clear, with a low around 61. West wind around 6 mph.
Tuesday
 
 Sunny, with a high near 82. West wind 6 to 9 mph.
Tuesday Night
 
 Mostly clear, with a low around 61. West wind 3 to 5 mph.
Wednesday
 
 Sunny, with a high near 84. Southwest wind 5 to 7 mph.

 

Forecast from NOAA-NWS for Somerville MA.