National Weather Service Forecast for: Groton CT
Issued by: National Weather Service New York, NY
Updated: 2:20 pm EDT May 26, 2026
 
Tonight

Tonight: Mostly cloudy, with a low around 58. Southwest wind around 8 mph.
Mostly Cloudy

 Wednesday

Wednesday: Mostly cloudy, with a high near 69. Southwest wind 6 to 13 mph.
Mostly Cloudy

 Wednesday
Night
Wednesday Night: A 20 percent chance of showers and thunderstorms before 11pm. Mostly cloudy, with a low around 59. North wind around 7 mph.
Slight Chance
T-storms then
Partly Cloudy
 Thursday

Thursday: A 50 percent chance of showers after 2pm. Mostly sunny, with a high near 66. North wind around 7 mph.
Mostly Sunny
then Chance
Showers
 Thursday
Night
Thursday Night: A 30 percent chance of showers before 8pm. Partly cloudy, with a low around 54. Northeast wind around 5 mph becoming calm in the evening.
Chance
Showers then
Partly Cloudy
 Friday

Friday: Mostly sunny, with a high near 66.
Mostly Sunny

 Friday
Night
Friday Night: A 40 percent chance of showers after 2am. Mostly cloudy, with a low around 55.
Mostly Cloudy
then Chance
Showers
 Saturday

Saturday: A 30 percent chance of showers before 2pm. Partly sunny, with a high near 70.
Chance
Showers
 Saturday
Night
Saturday Night: Partly cloudy, with a low around 50.
Partly Cloudy
Lo 58 °F Hi 69 °F Lo 59 °F Hi 66 °F Lo 54 °F Hi 66 °F Lo 55 °F Hi 70 °F Lo 50 °F

 

Tonight
 
 Mostly cloudy, with a low around 58. Southwest wind around 8 mph.
Wednesday
 
 Mostly cloudy, with a high near 69. Southwest wind 6 to 13 mph.
Wednesday Night
 
 A 20 percent chance of showers and thunderstorms before 11pm. Mostly cloudy, with a low around 59. North wind around 7 mph.
Thursday
 
 A 50 percent chance of showers after 2pm. Mostly sunny, with a high near 66. North wind around 7 mph.
Thursday Night
 
 A 30 percent chance of showers before 8pm. Partly cloudy, with a low around 54. Northeast wind around 5 mph becoming calm in the evening.
Friday
 
 Mostly sunny, with a high near 66.
Friday Night
 
 A 40 percent chance of showers after 2am. Mostly cloudy, with a low around 55.
Saturday
 
 A 30 percent chance of showers before 2pm. Partly sunny, with a high near 70.
Saturday Night
 
 Partly cloudy, with a low around 50.
Sunday
 
 Sunny, with a high near 69.
Sunday Night
 
 Partly cloudy, with a low around 53.
Monday
 
 A 30 percent chance of showers. Mostly sunny, with a high near 69.
Monday Night
 
 Partly cloudy, with a low around 52.
Tuesday
 
 Mostly sunny, with a high near 72.

 

Forecast from NOAA-NWS for Groton CT.