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

58°F

14°C

Humidity 67%
Wind Speed N 7 mph
Barometer 30.14 in (1020.5 mb)
Dewpoint 47°F (8°C)
Visibility 10.00 mi
Last update 19 Sep 4:56 am EDT
Extended Forecast for

Groton CT

  • Today

    Today: Mostly sunny, with a high near 67. Northeast wind 8 to 11 mph becoming southeast in the afternoon.

    High: 67 °F

    Mostly Sunny

  • Tonight

    Tonight: Increasing clouds, with a low around 57. Southeast wind 6 to 8 mph.

    Low: 57 °F

    Increasing
    Clouds

  • Sunday

    Sunday: Rain likely, mainly after 2pm. Mostly cloudy, with a high near 67. Southeast wind 8 to 13 mph. Chance of precipitation is 70%. New precipitation amounts between a quarter and half of an inch possible.

    High: 67 °F

    Slight Chance
    Rain then
    Rain Likely

  • Sunday Night

    Sunday Night: Rain and possibly a thunderstorm. Low around 58. East wind 7 to 10 mph becoming north after midnight. Chance of precipitation is 80%. New precipitation amounts between three quarters and one inch possible.

    Low: 58 °F

    Rain

  • Monday

    Monday: A 30 percent chance of rain, mainly before 8am. Mostly cloudy, with a high near 65. Northeast wind 11 to 16 mph.

    High: 65 °F

    Chance Rain

  • Monday Night

    Monday Night: Mostly cloudy, with a low around 53.

    Low: 53 °F

    Mostly Cloudy

  • Tuesday

    Tuesday: Mostly cloudy, with a high near 61.

    High: 61 °F

    Mostly Cloudy

  • Tuesday Night

    Tuesday Night: Mostly cloudy, with a low around 51.

    Low: 51 °F

    Mostly Cloudy

  • Wednesday

    Wednesday: Partly sunny, with a high near 64. Breezy.

    High: 64 °F

    Partly Sunny
    and Breezy

Detailed Forecast

Today
Mostly sunny, with a high near 67. Northeast wind 8 to 11 mph becoming southeast in the afternoon.
Tonight
Increasing clouds, with a low around 57. Southeast wind 6 to 8 mph.
Sunday
Rain likely, mainly after 2pm. Mostly cloudy, with a high near 67. Southeast wind 8 to 13 mph. Chance of precipitation is 70%. New precipitation amounts between a quarter and half of an inch possible.
Sunday Night
Rain and possibly a thunderstorm. Low around 58. East wind 7 to 10 mph becoming north after midnight. Chance of precipitation is 80%. New precipitation amounts between three quarters and one inch possible.
Monday
A 30 percent chance of rain, mainly before 8am. Mostly cloudy, with a high near 65. Northeast wind 11 to 16 mph.
Monday Night
Mostly cloudy, with a low around 53.
Tuesday
Mostly cloudy, with a high near 61.
Tuesday Night
Mostly cloudy, with a low around 51.
Wednesday
Partly sunny, with a high near 64. Breezy.
Wednesday Night
A 30 percent chance of showers after 2am. Mostly cloudy, with a low around 51. Breezy.
Thursday
A 30 percent chance of showers. Mostly cloudy, with a high near 63. Windy.
Thursday Night
A 40 percent chance of showers. Mostly cloudy, with a low around 52. Breezy.
Friday
A 30 percent chance of showers. Partly sunny, with a high near 64. Breezy.
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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:
3:16 am EDT Sep 19, 2026
Forecast Valid:
5am EDT Sep 19, 2026-6pm EDT Sep 25, 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