National Weather Service Forecast for: Waterbury CT
Issued by: National Weather Service New York, NY
Updated: 7:08 am EDT Jun 30, 2026
 
Today

Today: A 30 percent chance of showers and thunderstorms, mainly after 5pm. Mostly sunny, with a high near 88. Calm wind becoming southwest 5 to 9 mph in the afternoon.
Sunny then
Chance
Showers
 Tonight

Tonight: A 30 percent chance of showers and thunderstorms, mainly before 11pm. Partly cloudy, with a low around 66. Southwest wind 5 to 9 mph, with gusts as high as 20 mph.
Chance
Showers then
Slight Chance
T-storms
 Wednesday

Wednesday: A 20 percent chance of showers and thunderstorms after 2pm. Mostly sunny, with a high near 95. Heat index values as high as 106. Southwest wind around 8 mph.
Sunny then
Slight Chance
T-storms
 Wednesday
Night
Wednesday Night: Partly cloudy, with a low around 72. South wind around 6 mph becoming calm in the evening.
Partly Cloudy

 Thursday

Thursday: Sunny and hot, with a high near 100. Calm wind becoming west 5 to 8 mph in the morning.
Hot

 Thursday
Night
Thursday Night: Clear, with a low around 74.
Clear

 Friday

Friday: A 30 percent chance of showers after 2pm. Increasing clouds, with a high near 99.
Sunny then
Chance
Showers
 Friday
Night
Friday Night: A 30 percent chance of showers before 8pm. Partly cloudy, with a low around 70.
Chance
Showers then
Mostly Clear
 Independence
Day
Independence Day: A 40 percent chance of showers and thunderstorms after 2pm. Mostly sunny, with a high near 96.
Sunny then
Chance
T-storms
Hi 88 °F Lo 66 °F Hi 95 °F Lo 72 °F Hi 100 °F Lo 74 °F Hi 99 °F Lo 70 °F Hi 96 °F

Hazardous Weather Outlook
Extreme Heat Watch
Air Quality Alert
Extreme Heat Warning
 

Today
 
 A 30 percent chance of showers and thunderstorms, mainly after 5pm. Mostly sunny, with a high near 88. Calm wind becoming southwest 5 to 9 mph in the afternoon.
Tonight
 
 A 30 percent chance of showers and thunderstorms, mainly before 11pm. Partly cloudy, with a low around 66. Southwest wind 5 to 9 mph, with gusts as high as 20 mph.
Wednesday
 
 A 20 percent chance of showers and thunderstorms after 2pm. Mostly sunny, with a high near 95. Heat index values as high as 106. Southwest wind around 8 mph.
Wednesday Night
 
 Partly cloudy, with a low around 72. South wind around 6 mph becoming calm in the evening.
Thursday
 
 Sunny and hot, with a high near 100. Calm wind becoming west 5 to 8 mph in the morning.
Thursday Night
 
 Clear, with a low around 74.
Friday
 
 A 30 percent chance of showers after 2pm. Increasing clouds, with a high near 99.
Friday Night
 
 A 30 percent chance of showers before 8pm. Partly cloudy, with a low around 70.
Independence Day
 
 A 40 percent chance of showers and thunderstorms after 2pm. Mostly sunny, with a high near 96.
Saturday Night
 
 A 30 percent chance of showers and thunderstorms before 8pm. Partly cloudy, with a low around 68.
Sunday
 
 Mostly sunny, with a high near 93.
Sunday Night
 
 A 30 percent chance of showers. Mostly cloudy, with a low around 65.
Monday
 
 A 30 percent chance of showers and thunderstorms. Partly sunny, with a high near 89.

 

Forecast from NOAA-NWS for Waterbury CT.