NWS Forecast for Groton CT

National Weather Service Forecast for: Groton CT
Issued by: National Weather Service New York, NY

Updated: 4:59 pm EST Nov 1, 2026

Tonight Clear	Monday Patchy Fog then Mostly Sunny	Monday Night Mostly Clear	Tuesday Mostly Sunny	Tuesday Night Partly Cloudy	Wednesday Mostly Sunny	Wednesday Night Partly Cloudy	Thursday Partly Sunny then Chance Rain	Thursday Night Rain Likely
Lo 45 °F	Hi 63 °F	Lo 48 °F	Hi 65 °F	Lo 54 °F	Hi 67 °F	Lo 55 °F	Hi 70 °F	Lo 57 °F

Tonight	Clear, with a low around 45. West wind 6 to 8 mph.
Monday	Patchy fog before 7am. Otherwise, mostly sunny, with a high near 63. Southwest wind 5 to 15 mph.
Monday Night	Mostly clear, with a low around 48. Southwest wind 8 to 11 mph.
Tuesday	Mostly sunny, with a high near 65. Southwest wind 7 to 10 mph.
Tuesday Night	Partly cloudy, with a low around 54. Southwest wind 5 to 8 mph.
Wednesday	Mostly sunny, with a high near 67.
Wednesday Night	Partly cloudy, with a low around 55.
Thursday	A 30 percent chance of rain after 1pm. Partly sunny, with a high near 70.
Thursday Night	Rain likely, mainly after 1am. Mostly cloudy, with a low around 57. Chance of precipitation is 60%.
Friday	Rain likely. Mostly cloudy, with a high near 68. Chance of precipitation is 70%.
Friday Night	Rain likely. Mostly cloudy, with a low around 51. Chance of precipitation is 60%.
Saturday	A 50 percent chance of rain. Mostly cloudy, with a high near 63.
Saturday Night	Mostly cloudy, with a low around 45.
Sunday	Mostly sunny, with a high near 61.

Forecast from NOAA-NWS for Groton CT.