National Weather Service Forecast for: Groton CT
Issued by: National Weather Service New York, NY
Updated: 10:17 pm EDT May 30, 2025
 
Overnight

Overnight: A chance of showers, then showers and possibly a thunderstorm after 2am. Areas of fog. Low around 58. Southeast wind 5 to 7 mph. Chance of precipitation is 100%. New rainfall amounts between a quarter and half of an inch possible.
Showers and
Areas Fog
 Saturday

Saturday: Showers and possibly a thunderstorm before 2pm, then a chance of showers. High near 64. South wind 10 to 14 mph becoming west in the afternoon. Chance of precipitation is 80%. New precipitation amounts between a quarter and half of an inch possible.
Showers then
Chance
Showers
 Saturday
Night
Saturday Night: Showers likely, mainly between 8pm and 2am. Mostly cloudy, with a low around 52. West wind around 10 mph. Chance of precipitation is 60%. New precipitation amounts of less than a tenth of an inch possible.
Showers
Likely
 Sunday

Sunday: A 30 percent chance of showers before 8am. Mostly sunny, with a high near 61. Southwest wind around 16 mph.
Chance
Showers then
Mostly Sunny
 Sunday
Night
Sunday Night: Mostly clear, with a low around 50. West wind 6 to 9 mph.
Mostly Clear

 Monday

Monday: Sunny, with a high near 65.
Sunny

 Monday
Night
Monday Night: Mostly clear, with a low around 53.
Mostly Clear

 Tuesday

Tuesday: Sunny, with a high near 69.
Sunny

 Tuesday
Night
Tuesday Night: Partly cloudy, with a low around 57.
Partly Cloudy
Lo 58 °F Hi 64 °F Lo 52 °F Hi 61 °F Lo 50 °F Hi 65 °F Lo 53 °F Hi 69 °F Lo 57 °F

 

Overnight
 
 A chance of showers, then showers and possibly a thunderstorm after 2am. Areas of fog. Low around 58. Southeast wind 5 to 7 mph. Chance of precipitation is 100%. New rainfall amounts between a quarter and half of an inch possible.
Saturday
 
 Showers and possibly a thunderstorm before 2pm, then a chance of showers. High near 64. South wind 10 to 14 mph becoming west in the afternoon. Chance of precipitation is 80%. New precipitation amounts between a quarter and half of an inch possible.
Saturday Night
 
 Showers likely, mainly between 8pm and 2am. Mostly cloudy, with a low around 52. West wind around 10 mph. Chance of precipitation is 60%. New precipitation amounts of less than a tenth of an inch possible.
Sunday
 
 A 30 percent chance of showers before 8am. Mostly sunny, with a high near 61. Southwest wind around 16 mph.
Sunday Night
 
 Mostly clear, with a low around 50. West wind 6 to 9 mph.
Monday
 
 Sunny, with a high near 65.
Monday Night
 
 Mostly clear, with a low around 53.
Tuesday
 
 Sunny, with a high near 69.
Tuesday Night
 
 Partly cloudy, with a low around 57.
Wednesday
 
 Mostly sunny, with a high near 72.
Wednesday Night
 
 Partly cloudy, with a low around 62.
Thursday
 
 Mostly sunny, with a high near 74.
Thursday Night
 
 A 30 percent chance of showers. Mostly cloudy, with a low around 64.
Friday
 
 A 40 percent chance of showers. Mostly cloudy, with a high near 71.

 

Forecast from NOAA-NWS for Groton CT.