National Weather Service Forecast for: Groton CT
Issued by: National Weather Service New York, NY
Updated: 2:19 pm EDT Apr 6, 2026
 
Tonight

Tonight: A 30 percent chance of showers, mainly after 5am. Increasing clouds, with a low around 38. West wind 5 to 10 mph becoming light and variable.
Partly Cloudy
then Chance
Showers

 Tuesday

Tuesday: A chance of rain and snow showers before 8am, then a slight chance of rain showers. Partly sunny, with a high near 47. East wind 7 to 15 mph becoming west in the afternoon. Chance of precipitation is 30%.
Chance
Rain/Snow
then Slight
Chance
Showers
 Tuesday
Night
Tuesday Night: Mostly clear, with a low around 29. Wind chill values between 20 and 25. North wind 11 to 13 mph.
Mostly Clear


 Wednesday

Wednesday: Sunny, with a high near 43. Wind chill values between 20 and 30. North wind 5 to 8 mph becoming southeast in the afternoon.
Sunny


 Wednesday
Night
Wednesday Night: Clear, with a low around 33. South wind 3 to 6 mph.
Clear


 Thursday

Thursday: Sunny, with a high near 47.
Sunny


 Thursday
Night
Thursday Night: Partly cloudy, with a low around 40.
Partly Cloudy


 Friday

Friday: Mostly sunny, with a high near 56.
Mostly Sunny


 Friday
Night
Friday Night: Partly cloudy, with a low around 47.
Partly Cloudy
Lo 38 °F Hi 47 °F Lo 29 °F Hi 43 °F Lo 33 °F Hi 47 °F Lo 40 °F Hi 56 °F Lo 47 °F

 

Tonight
 
 A 30 percent chance of showers, mainly after 5am. Increasing clouds, with a low around 38. West wind 5 to 10 mph becoming light and variable.
Tuesday
 
 A chance of rain and snow showers before 8am, then a slight chance of rain showers. Partly sunny, with a high near 47. East wind 7 to 15 mph becoming west in the afternoon. Chance of precipitation is 30%.
Tuesday Night
 
 Mostly clear, with a low around 29. Wind chill values between 20 and 25. North wind 11 to 13 mph.
Wednesday
 
 Sunny, with a high near 43. Wind chill values between 20 and 30. North wind 5 to 8 mph becoming southeast in the afternoon.
Wednesday Night
 
 Clear, with a low around 33. South wind 3 to 6 mph.
Thursday
 
 Sunny, with a high near 47.
Thursday Night
 
 Partly cloudy, with a low around 40.
Friday
 
 Mostly sunny, with a high near 56.
Friday Night
 
 Partly cloudy, with a low around 47.
Saturday
 
 Mostly sunny, with a high near 61.
Saturday Night
 
 Partly cloudy, with a low around 45.
Sunday
 
 Mostly sunny, with a high near 55.
Sunday Night
 
 Mostly cloudy, with a low around 46.
Monday
 
 Partly sunny, with a high near 61.

 

Forecast from NOAA-NWS for Groton CT.