National Weather Service Forecast for: Waltham MA
Issued by: National Weather Service Norton, MA
Updated: 2:35 pm EDT Sep 12, 2026
 
Tonight

Tonight: Mostly cloudy, with a low around 61. South wind 3 to 6 mph.
Mostly Cloudy
 Sunday

Sunday: Showers and thunderstorms, mainly before 4pm. Some of the storms could produce heavy rainfall. High near 73. South wind around 6 mph becoming east in the afternoon. Chance of precipitation is 80%. New rainfall amounts between 1 and 2 inches possible.
Heavy Rain
 Sunday
Night
Sunday Night: Patchy fog. Otherwise, cloudy, then gradually becoming partly cloudy, with a low around 63. Calm wind becoming west around 5 mph after midnight.
Patchy Fog
 Monday

Monday: Mostly cloudy, then gradually becoming sunny, with a high near 74. Northwest wind 7 to 10 mph, with gusts as high as 21 mph.
Decreasing
Clouds
 Monday
Night
Monday Night: Clear, with a low around 50. North wind 3 to 7 mph.
Clear
 Tuesday

Tuesday: Sunny, with a high near 70. North wind around 5 mph becoming east in the afternoon.
Sunny
 Tuesday
Night
Tuesday Night: Mostly clear, with a low around 54. Light and variable wind.
Mostly Clear
 Wednesday

Wednesday: Sunny, with a high near 78. Southwest wind 3 to 6 mph.
Sunny
 Wednesday
Night
Wednesday Night: Partly cloudy, with a low around 60. Light south wind.
Partly Cloudy
Lo 61 °F Hi 73 °F Lo 63 °F Hi 74 °F Lo 50 °F Hi 70 °F Lo 54 °F Hi 78 °F Lo 60 °F

 

Tonight
 
 Mostly cloudy, with a low around 61. South wind 3 to 6 mph.
Sunday
 
 Showers and thunderstorms, mainly before 4pm. Some of the storms could produce heavy rainfall. High near 73. South wind around 6 mph becoming east in the afternoon. Chance of precipitation is 80%. New rainfall amounts between 1 and 2 inches possible.
Sunday Night
 
 Patchy fog. Otherwise, cloudy, then gradually becoming partly cloudy, with a low around 63. Calm wind becoming west around 5 mph after midnight.
Monday
 
 Mostly cloudy, then gradually becoming sunny, with a high near 74. Northwest wind 7 to 10 mph, with gusts as high as 21 mph.
Monday Night
 
 Clear, with a low around 50. North wind 3 to 7 mph.
Tuesday
 
 Sunny, with a high near 70. North wind around 5 mph becoming east in the afternoon.
Tuesday Night
 
 Mostly clear, with a low around 54. Light and variable wind.
Wednesday
 
 Sunny, with a high near 78. Southwest wind 3 to 6 mph.
Wednesday Night
 
 Partly cloudy, with a low around 60. Light south wind.
Thursday
 
 Mostly sunny, with a high near 80. Light and variable wind becoming south 5 to 7 mph in the morning.
Thursday Night
 
 Partly cloudy, with a low around 63. South wind around 7 mph.
Friday
 
 A chance of showers. Partly sunny, with a high near 77. West wind around 8 mph becoming north in the afternoon. Chance of precipitation is 30%.
Friday Night
 
 Mostly cloudy, with a low around 57. North wind 3 to 5 mph.
Saturday
 
 Mostly sunny, with a high near 72. North wind around 7 mph becoming southeast in the afternoon.

 

Forecast from NOAA-NWS for Waltham MA.