National Weather Service Forecast for: Waterbury CT
Issued by: National Weather Service New York, NY
Updated: 1:56 am EDT Jul 27, 2025
 
Today

Today: A chance of showers, then showers likely and possibly a thunderstorm after 2pm.  Mostly cloudy, with a high near 79. Calm wind becoming south 5 to 7 mph in the afternoon.  Chance of precipitation is 70%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Showers
Likely

Tonight

Tonight: Showers likely and possibly a thunderstorm before 8pm.  Mostly cloudy, with a low around 69. Light and variable wind.  Chance of precipitation is 60%. New precipitation amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Showers
Likely then
Partly Cloudy
Monday

Monday: Sunny, with a high near 93. Heat index values as high as 99. Calm wind becoming north around 6 mph in the afternoon.
Sunny

Monday
Night
Monday Night: Mostly clear, with a low around 69. Calm wind.
Mostly Clear

Tuesday

Tuesday: Sunny, with a high near 95. Calm wind becoming west around 6 mph in the afternoon.
Sunny

Tuesday
Night
Tuesday Night: Mostly clear, with a low around 72.
Mostly Clear

Wednesday

Wednesday: Mostly sunny, with a high near 94.
Mostly Sunny

Wednesday
Night
Wednesday Night: A chance of showers and thunderstorms between 8pm and 2am, then a chance of showers after 2am.  Mostly cloudy, with a low around 69. Chance of precipitation is 50%.
Chance
T-storms

Thursday

Thursday: A chance of showers, with thunderstorms also possible after 2pm.  Partly sunny, with a high near 82. Chance of precipitation is 50%.
Chance
Showers then
Chance
T-storms
Hi 79 °F Lo 69 °F Hi 93 °F Lo 69 °F Hi 95 °F Lo 72 °F Hi 94 °F Lo 69 °F Hi 82 °F

Heat Advisory
 

Today
 
A chance of showers, then showers likely and possibly a thunderstorm after 2pm. Mostly cloudy, with a high near 79. Calm wind becoming south 5 to 7 mph in the afternoon. Chance of precipitation is 70%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Tonight
 
Showers likely and possibly a thunderstorm before 8pm. Mostly cloudy, with a low around 69. Light and variable wind. Chance of precipitation is 60%. New precipitation amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Monday
 
Sunny, with a high near 93. Heat index values as high as 99. Calm wind becoming north around 6 mph in the afternoon.
Monday Night
 
Mostly clear, with a low around 69. Calm wind.
Tuesday
 
Sunny, with a high near 95. Calm wind becoming west around 6 mph in the afternoon.
Tuesday Night
 
Mostly clear, with a low around 72.
Wednesday
 
Mostly sunny, with a high near 94.
Wednesday Night
 
A chance of showers and thunderstorms between 8pm and 2am, then a chance of showers after 2am. Mostly cloudy, with a low around 69. Chance of precipitation is 50%.
Thursday
 
A chance of showers, with thunderstorms also possible after 2pm. Partly sunny, with a high near 82. Chance of precipitation is 50%.
Thursday Night
 
A chance of showers and thunderstorms before 8pm, then a chance of showers between 8pm and 2am. Partly cloudy, with a low around 61. Chance of precipitation is 30%.
Friday
 
Mostly sunny, with a high near 79.
Friday Night
 
Mostly clear, with a low around 56.
Saturday
 
Sunny, with a high near 80.

 

Forecast from NOAA-NWS for Waterbury CT.