National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce
Current conditions at

Groton / New London, Groton / New London Airport (KGON)

Lat: 41.33°NLon: 72.05°WElev: 10ft.

Fair

56°F

13°C

Humidity 90%
Wind Speed S 6 mph
Barometer 30.21 in (1023.1 mb)
Dewpoint 53°F (12°C)
Visibility 10.00 mi
Last update 21 May 6:56 pm EDT
Extended Forecast for

Groton CT

  • Tonight

    Tonight: A 20 percent chance of rain before 8pm. Mostly cloudy, with a low around 50. Light and variable wind.

    Low: 50 °F

    Slight Chance
    Rain then
    Mostly Cloudy

  • Friday

    Friday: Mostly sunny, with a high near 63. East wind 9 to 11 mph.

    High: 63 °F

    Mostly Sunny

  • Friday Night

    Friday Night: Mostly cloudy, with a low around 49. East wind 3 to 6 mph.

    Low: 49 °F

    Mostly Cloudy

  • Saturday

    Saturday: A 40 percent chance of rain, mainly after 2pm. Cloudy, with a high near 58. East wind 8 to 13 mph.

    High: 58 °F

    Chance Rain

  • Saturday Night

    Saturday Night: Rain, mainly after 8pm. Low around 49. East wind 11 to 16 mph. Chance of precipitation is 90%. New precipitation amounts between a quarter and half of an inch possible.

    Low: 49 °F

    Rain

  • Sunday

    Sunday: Rain. High near 59. Breezy. Chance of precipitation is 100%. New precipitation amounts between a half and three quarters of an inch possible.

    High: 59 °F

    Rain and
    Breezy

  • Sunday Night

    Sunday Night: Rain before 8pm, then showers likely, mainly between 8pm and 2am. Low around 53. Chance of precipitation is 80%.

    Low: 53 °F

    Rain

  • Memorial Day

    Memorial Day: A 40 percent chance of showers before 2pm. Mostly cloudy, with a high near 65.

    High: 65 °F

    Chance
    Showers

  • Monday Night

    Monday Night: Mostly cloudy, with a low around 54.

    Low: 54 °F

    Mostly Cloudy

Detailed Forecast

Tonight
A 20 percent chance of rain before 8pm. Mostly cloudy, with a low around 50. Light and variable wind.
Friday
Mostly sunny, with a high near 63. East wind 9 to 11 mph.
Friday Night
Mostly cloudy, with a low around 49. East wind 3 to 6 mph.
Saturday
A 40 percent chance of rain, mainly after 2pm. Cloudy, with a high near 58. East wind 8 to 13 mph.
Saturday Night
Rain, mainly after 8pm. Low around 49. East wind 11 to 16 mph. Chance of precipitation is 90%. New precipitation amounts between a quarter and half of an inch possible.
Sunday
Rain. High near 59. Breezy. Chance of precipitation is 100%. New precipitation amounts between a half and three quarters of an inch possible.
Sunday Night
Rain before 8pm, then showers likely, mainly between 8pm and 2am. Low around 53. Chance of precipitation is 80%.
Memorial Day
A 40 percent chance of showers before 2pm. Mostly cloudy, with a high near 65.
Monday Night
Mostly cloudy, with a low around 54.
Tuesday
Mostly cloudy, with a high near 70.
Tuesday Night
Mostly cloudy, with a low around 55.
Wednesday
Mostly sunny, with a high near 73.
Wednesday Night
Partly cloudy, with a low around 55.
Thursday
Mostly sunny, with a high near 71.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Groton CT
 41.32°N 72.06°W (Elev. 3 ft)
Last Update:
2:25 pm EDT May 21, 2026
Forecast Valid:
7pm EDT May 21, 2026-6pm EDT May 28, 2026
 
Forecast Discussion
 
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Additional Resources

Radar & Satellite Image

Link to Local Radar Data Link to Satellite Data

Hourly Weather Forecast

National Digital Forecast Database

National Digital Forecast Database Maximum Temperature Forecast

High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation