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

70°F

21°C

Humidity 61%
Wind Speed SW 8 mph
Barometer 29.78 in (1008.3 mb)
Dewpoint 56°F (13°C)
Visibility 10.00 mi
Last update 16 Apr 4:56 pm EDT
Extended Forecast for

3 Miles SE Old Lyme CT

  • Tonight

    Tonight: A slight chance of showers between 11pm and 2am. Mostly cloudy, with a low around 53. South wind 5 to 7 mph becoming calm after midnight. Chance of precipitation is 20%.

    Low: 53 °F

    Slight Chance
    Showers

  • Friday

    Friday: A slight chance of showers, then showers likely and possibly a thunderstorm after 2pm. Partly sunny, with a high near 71. Calm wind becoming west around 6 mph in the afternoon. Chance of precipitation is 60%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

    High: 71 °F

    Slight Chance
    Showers then
    Showers
    Likely

  • Friday Night

    Friday Night: Showers likely and possibly a thunderstorm before 8pm, then a slight chance of showers and thunderstorms between 8pm and 2am. Mostly cloudy, with a low around 50. Northeast wind 3 to 5 mph. Chance of precipitation is 60%.

    Low: 50 °F

    Showers
    Likely then
    Slight Chance
    T-storms

  • Saturday

    Saturday: Partly sunny, with a high near 60. Northeast wind 5 to 7 mph becoming southeast in the afternoon.

    High: 60 °F

    Partly Sunny

  • Saturday Night

    Saturday Night: A 30 percent chance of showers after 2am. Mostly cloudy, with a low around 47. Southeast wind 3 to 6 mph.

    Low: 47 °F

    Mostly Cloudy
    then Chance
    Showers

  • Sunday

    Sunday: Showers, mainly after 8am. High near 57. Chance of precipitation is 80%. New precipitation amounts between a quarter and half of an inch possible.

    High: 57 °F

    Showers

  • Sunday Night

    Sunday Night: Showers, mainly before 8pm. Low around 37. Chance of precipitation is 80%.

    Low: 37 °F

    Showers then
    Chance
    Showers

  • Monday

    Monday: Mostly sunny, with a high near 48.

    High: 48 °F

    Mostly Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 32.

    Low: 32 °F

    Mostly Clear

Detailed Forecast

Tonight
A slight chance of showers between 11pm and 2am. Mostly cloudy, with a low around 53. South wind 5 to 7 mph becoming calm after midnight. Chance of precipitation is 20%.
Friday
A slight chance of showers, then showers likely and possibly a thunderstorm after 2pm. Partly sunny, with a high near 71. Calm wind becoming west around 6 mph in the afternoon. Chance of precipitation is 60%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Friday Night
Showers likely and possibly a thunderstorm before 8pm, then a slight chance of showers and thunderstorms between 8pm and 2am. Mostly cloudy, with a low around 50. Northeast wind 3 to 5 mph. Chance of precipitation is 60%.
Saturday
Partly sunny, with a high near 60. Northeast wind 5 to 7 mph becoming southeast in the afternoon.
Saturday Night
A 30 percent chance of showers after 2am. Mostly cloudy, with a low around 47. Southeast wind 3 to 6 mph.
Sunday
Showers, mainly after 8am. High near 57. Chance of precipitation is 80%. New precipitation amounts between a quarter and half of an inch possible.
Sunday Night
Showers, mainly before 8pm. Low around 37. Chance of precipitation is 80%.
Monday
Mostly sunny, with a high near 48.
Monday Night
Mostly clear, with a low around 32.
Tuesday
Sunny, with a high near 49.
Tuesday Night
Partly cloudy, with a low around 41.
Wednesday
Partly sunny, with a high near 60.
Wednesday Night
Partly cloudy, with a low around 43.
Thursday
Mostly sunny, with a high near 58.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
3 Miles SE Old Lyme CT
 41.28°N 72.3°W (Elev. 0 ft)
Last Update:
2:57 pm EDT Apr 16, 2026
Forecast Valid:
5pm EDT Apr 16, 2026-6pm EDT Apr 23, 2026
 
Forecast Discussion
 
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Additional Resources

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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