National Weather Service Forecast for: Willimantic CT
Issued by: National Weather Service Norton, MA
Updated: 12:46 am EDT Jun 30, 2026
 
Overnight

Overnight: Partly cloudy, with a low around 62. Calm wind.
Partly Cloudy
 Tuesday

Tuesday: Mostly sunny, with a high near 88. Calm wind becoming southwest 5 to 9 mph in the morning.
Mostly Sunny
 Tuesday
Night
Tuesday Night: A chance of showers and thunderstorms, mainly between 7pm and 2am. Partly cloudy, with a low around 67. South wind 3 to 8 mph. Chance of precipitation is 40%.
Chance
Showers
 Wednesday

Wednesday: Mostly sunny and hot, with a high near 94. Heat index values as high as 99. Southwest wind 6 to 10 mph, with gusts as high as 21 mph.
Hot
 Wednesday
Night
Wednesday Night: A chance of showers and thunderstorms, mainly before 1am. Mostly cloudy, with a low around 73. South wind 5 to 7 mph becoming calm in the evening. Chance of precipitation is 30%.
Chance
Showers
 Thursday

Thursday: Sunny and hot, with a high near 98. Calm wind becoming west 5 to 9 mph in the morning.
Hot
 Thursday
Night
Thursday Night: Clear, with a low around 73. Southwest wind around 6 mph becoming calm in the evening.
Clear
 Friday

Friday: Sunny and hot, with a high near 99. Light west wind increasing to 8 to 13 mph in the morning.
Hot
 Friday
Night
Friday Night: Mostly clear, with a low around 71. Northwest wind 3 to 6 mph.
Mostly Clear
Lo 62 °F Hi 88 °F Lo 67 °F Hi 94 °F Lo 73 °F Hi 98 °F Lo 73 °F Hi 99 °F Lo 71 °F

Extreme Heat Watch
 

Overnight
 
 Partly cloudy, with a low around 62. Calm wind.
Tuesday
 
 Mostly sunny, with a high near 88. Calm wind becoming southwest 5 to 9 mph in the morning.
Tuesday Night
 
 A chance of showers and thunderstorms, mainly between 7pm and 2am. Partly cloudy, with a low around 67. South wind 3 to 8 mph. Chance of precipitation is 40%.
Wednesday
 
 Mostly sunny and hot, with a high near 94. Heat index values as high as 99. Southwest wind 6 to 10 mph, with gusts as high as 21 mph.
Wednesday Night
 
 A chance of showers and thunderstorms, mainly before 1am. Mostly cloudy, with a low around 73. South wind 5 to 7 mph becoming calm in the evening. Chance of precipitation is 30%.
Thursday
 
 Sunny and hot, with a high near 98. Calm wind becoming west 5 to 9 mph in the morning.
Thursday Night
 
 Clear, with a low around 73. Southwest wind around 6 mph becoming calm in the evening.
Friday
 
 Sunny and hot, with a high near 99. Light west wind increasing to 8 to 13 mph in the morning.
Friday Night
 
 Mostly clear, with a low around 71. Northwest wind 3 to 6 mph.
Independence Day
 
 A chance of showers and thunderstorms after 3pm. Mostly sunny and hot, with a high near 95. Calm wind becoming west 5 to 9 mph in the morning. Chance of precipitation is 30%.
Saturday Night
 
 A chance of showers and thunderstorms. Partly cloudy, with a low around 70. Light northwest wind. Chance of precipitation is 30%.
Sunday
 
 Mostly sunny and hot, with a high near 90. Calm wind becoming west around 6 mph in the afternoon.
Sunday Night
 
 A chance of showers. Partly cloudy, with a low around 68. Light and variable wind. Chance of precipitation is 30%.
Monday
 
 A chance of showers. Partly sunny, with a high near 86. Calm wind becoming southeast around 6 mph in the afternoon. Chance of precipitation is 30%.

 

Forecast from NOAA-NWS for Willimantic CT.