National Weather Service Forecast for: Arlington MA
Issued by: National Weather Service Norton, MA
Updated: 2:14 am EDT Jun 30, 2026
 
Overnight

Overnight: Mostly clear, with a low around 64. Light southwest wind.
Mostly Clear

Tuesday

Tuesday: Increasing clouds, with a high near 89. Southwest wind 5 to 11 mph.
Increasing
Clouds

Tuesday
Night
Tuesday Night: A chance of showers and thunderstorms after 9pm.  Mostly cloudy, with a low around 72. Southwest wind 11 to 14 mph.  Chance of precipitation is 40%.
Chance
Showers

Wednesday

Wednesday: A slight chance of showers and thunderstorms before 8am, then a slight chance of showers and thunderstorms after 3pm.  Partly sunny and hot, with a high near 99. Heat index values as high as 108. West wind 13 to 15 mph.  Chance of precipitation is 20%.
Partly Sunny
then Slight
Chance
T-storms
Wednesday
Night
Wednesday Night: A chance of showers and thunderstorms, mainly before 1am.  Partly cloudy, with a low around 77. Southwest wind 6 to 9 mph.  Chance of precipitation is 30%.
Chance
Showers

Thursday

Thursday: Sunny and hot, with a high near 102. West wind 7 to 9 mph.
Hot

Thursday
Night
Thursday Night: Clear, with a low around 78. West wind 5 to 8 mph.
Clear

Friday

Friday: Sunny and hot, with a high near 100. West wind 7 to 11 mph, with gusts as high as 21 mph.
Hot

Friday
Night
Friday Night: Mostly clear, with a low around 75. West wind 5 to 7 mph.
Mostly Clear

Lo 64 °F Hi 89 °F Lo 72 °F Hi 99 °F Lo 77 °F Hi 102 °F Lo 78 °F Hi 100 °F Lo 75 °F

Extreme Heat Warning
 

Overnight
 
Mostly clear, with a low around 64. Light southwest wind.
Tuesday
 
Increasing clouds, with a high near 89. Southwest wind 5 to 11 mph.
Tuesday Night
 
A chance of showers and thunderstorms after 9pm. Mostly cloudy, with a low around 72. Southwest wind 11 to 14 mph. Chance of precipitation is 40%.
Wednesday
 
A slight chance of showers and thunderstorms before 8am, then a slight chance of showers and thunderstorms after 3pm. Partly sunny and hot, with a high near 99. Heat index values as high as 108. West wind 13 to 15 mph. Chance of precipitation is 20%.
Wednesday Night
 
A chance of showers and thunderstorms, mainly before 1am. Partly cloudy, with a low around 77. Southwest wind 6 to 9 mph. Chance of precipitation is 30%.
Thursday
 
Sunny and hot, with a high near 102. West wind 7 to 9 mph.
Thursday Night
 
Clear, with a low around 78. West wind 5 to 8 mph.
Friday
 
Sunny and hot, with a high near 100. West wind 7 to 11 mph, with gusts as high as 21 mph.
Friday Night
 
Mostly clear, with a low around 75. West wind 5 to 7 mph.
Independence Day
 
A chance of showers and thunderstorms after 2pm. Mostly sunny and hot, with a high near 95. West wind 5 to 9 mph. Chance of precipitation is 40%.
Saturday Night
 
A chance of showers and thunderstorms. Partly cloudy, with a low around 72. West wind 3 to 5 mph. Chance of precipitation is 30%.
Sunday
 
Mostly sunny, with a high near 89. Light and variable wind becoming north 5 to 8 mph in the morning.
Sunday Night
 
Partly cloudy, with a low around 67. Southeast wind around 5 mph becoming calm in the evening.
Monday
 
Partly sunny, with a high near 84. Light east wind increasing to 5 to 9 mph in the morning.

 

Forecast from NOAA-NWS for Arlington MA.