National Weather Service Forecast for: Waltham MA
Issued by: National Weather Service Norton, MA
Updated: 12:47 am EDT Jul 6, 2025
 
Today

Today: Mostly sunny and hot, with a high near 93. Heat index values as high as 96. Southwest wind 7 to 10 mph, with gusts as high as 20 mph.
Hot

 Tonight

Tonight: Mostly clear, with a low around 71. Southwest wind 7 to 9 mph.
Mostly Clear

 Monday

Monday: A slight chance of showers and thunderstorms after 3pm. Partly sunny and hot, with a high near 93. Heat index values as high as 98. Southwest wind 7 to 10 mph, with gusts as high as 21 mph. Chance of precipitation is 20%.
Partly Sunny
then Slight
Chance
T-storms
 Monday
Night
Monday Night: A chance of showers and thunderstorms. Mostly cloudy, with a low around 74. Southwest wind 7 to 9 mph. Chance of precipitation is 40%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Chance
Showers

 Tuesday

Tuesday: A chance of showers before 8am, then a chance of showers and thunderstorms between 8am and 1pm, then showers likely and possibly a thunderstorm after 1pm. Mostly cloudy, with a high near 89. Southwest wind around 7 mph. Chance of precipitation is 60%.
Showers
Likely

 Tuesday
Night
Tuesday Night: A chance of showers and thunderstorms. Mostly cloudy, with a low around 70. Southwest wind around 5 mph becoming light and variable in the evening. Chance of precipitation is 50%.
Chance
T-storms then
Chance
Showers
 Wednesday

Wednesday: Mostly cloudy, with a high near 81. North wind around 6 mph becoming east in the afternoon.
Mostly Cloudy

 Wednesday
Night
Wednesday Night: Mostly cloudy, with a low around 66. East wind around 5 mph becoming calm in the evening.
Mostly Cloudy

 Thursday

Thursday: A chance of showers after 3pm. Mostly cloudy, with a high near 78. East wind 3 to 7 mph. Chance of precipitation is 30%.
Mostly Cloudy
then Chance
Showers
Hi 93 °F Lo 71 °F Hi 93 °F Lo 74 °F Hi 89 °F Lo 70 °F Hi 81 °F Lo 66 °F Hi 78 °F

Heat Advisory
 

Today
 
 Mostly sunny and hot, with a high near 93. Heat index values as high as 96. Southwest wind 7 to 10 mph, with gusts as high as 20 mph.
Tonight
 
 Mostly clear, with a low around 71. Southwest wind 7 to 9 mph.
Monday
 
 A slight chance of showers and thunderstorms after 3pm. Partly sunny and hot, with a high near 93. Heat index values as high as 98. Southwest wind 7 to 10 mph, with gusts as high as 21 mph. Chance of precipitation is 20%.
Monday Night
 
 A chance of showers and thunderstorms. Mostly cloudy, with a low around 74. Southwest wind 7 to 9 mph. Chance of precipitation is 40%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Tuesday
 
 A chance of showers before 8am, then a chance of showers and thunderstorms between 8am and 1pm, then showers likely and possibly a thunderstorm after 1pm. Mostly cloudy, with a high near 89. Southwest wind around 7 mph. Chance of precipitation is 60%.
Tuesday Night
 
 A chance of showers and thunderstorms. Mostly cloudy, with a low around 70. Southwest wind around 5 mph becoming light and variable in the evening. Chance of precipitation is 50%.
Wednesday
 
 Mostly cloudy, with a high near 81. North wind around 6 mph becoming east in the afternoon.
Wednesday Night
 
 Mostly cloudy, with a low around 66. East wind around 5 mph becoming calm in the evening.
Thursday
 
 A chance of showers after 3pm. Mostly cloudy, with a high near 78. East wind 3 to 7 mph. Chance of precipitation is 30%.
Thursday Night
 
 A chance of showers. Cloudy, with a low around 66. East wind around 5 mph becoming calm in the evening. Chance of precipitation is 30%.
Friday
 
 A chance of showers. Mostly cloudy, with a high near 77. Northeast wind 5 to 7 mph. Chance of precipitation is 30%.
Friday Night
 
 A chance of showers. Mostly cloudy, with a low around 65. East wind around 5 mph becoming calm in the evening. Chance of precipitation is 30%.
Saturday
 
 Mostly cloudy, with a high near 78. East wind 3 to 7 mph.

 

Forecast from NOAA-NWS for Waltham MA.