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.

Overcast

43°F

6°C

Humidity 80%
Wind Speed SW 9 mph
Barometer 29.86 in (1010.9 mb)
Dewpoint 37°F (3°C)
Visibility 10.00 mi
Wind Chill38°F (3°C)
Last update 20 Mar 6:56 pm EDT
Extended Forecast for

3 Miles SE South Lyme CT

  • Tonight

    Tonight: Showers, mainly before 3am. Patchy fog after 3am. Steady temperature around 43. Southwest wind 11 to 17 mph. Chance of precipitation is 100%. New precipitation amounts between a quarter and half of an inch possible.

    Low: 43 °F

    Showers and
    Patchy Fog

  • Saturday

    Saturday: Patchy fog before 8am. Otherwise, mostly cloudy, then gradually becoming sunny, with a high near 53. Northwest wind 9 to 13 mph.

    High: 53 °F

    Patchy Fog
    then Sunny

  • Saturday Night

    Saturday Night: Increasing clouds, with a low around 38. Northeast wind around 5 mph becoming calm in the evening.

    Low: 38 °F

    Increasing
    Clouds

  • Sunday

    Sunday: A 30 percent chance of rain, mainly after 2pm. Mostly cloudy, with a high near 51. South wind 7 to 13 mph.

    High: 51 °F

    Chance Rain

  • Sunday Night

    Sunday Night: Rain likely, mainly after 8pm. Cloudy, with a low around 37. Southwest wind around 8 mph becoming northeast after midnight. Chance of precipitation is 70%. New precipitation amounts between a quarter and half of an inch possible.

    Low: 37 °F

    Rain Likely

  • Monday

    Monday: A 40 percent chance of rain before 2pm. Mostly cloudy, with a high near 44.

    High: 44 °F

    Chance Rain

  • Monday Night

    Monday Night: Partly cloudy, with a low around 31.

    Low: 31 °F

    Partly Cloudy

  • Tuesday

    Tuesday: Sunny, with a high near 43.

    High: 43 °F

    Sunny

  • Tuesday Night

    Tuesday Night: Mostly cloudy, with a low around 35.

    Low: 35 °F

    Mostly Cloudy

Detailed Forecast

Tonight
Showers, mainly before 3am. Patchy fog after 3am. Steady temperature around 43. Southwest wind 11 to 17 mph. Chance of precipitation is 100%. New precipitation amounts between a quarter and half of an inch possible.
Saturday
Patchy fog before 8am. Otherwise, mostly cloudy, then gradually becoming sunny, with a high near 53. Northwest wind 9 to 13 mph.
Saturday Night
Increasing clouds, with a low around 38. Northeast wind around 5 mph becoming calm in the evening.
Sunday
A 30 percent chance of rain, mainly after 2pm. Mostly cloudy, with a high near 51. South wind 7 to 13 mph.
Sunday Night
Rain likely, mainly after 8pm. Cloudy, with a low around 37. Southwest wind around 8 mph becoming northeast after midnight. Chance of precipitation is 70%. New precipitation amounts between a quarter and half of an inch possible.
Monday
A 40 percent chance of rain before 2pm. Mostly cloudy, with a high near 44.
Monday Night
Partly cloudy, with a low around 31.
Tuesday
Sunny, with a high near 43.
Tuesday Night
Mostly cloudy, with a low around 35.
Wednesday
A chance of rain between 8am and 2pm. Partly sunny, with a high near 45. Chance of precipitation is 30%.
Wednesday Night
Partly cloudy, with a low around 32.
Thursday
Mostly sunny, with a high near 47.
Thursday Night
A 50 percent chance of rain. Mostly cloudy, with a low around 37.
Friday
A 40 percent chance of rain. Mostly cloudy, with a high near 48.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
3 Miles SE South Lyme CT
 41.3°N 72.24°W (Elev. 0 ft)
Last Update:
3:15 pm EDT Mar 20, 2026
Forecast Valid:
7pm EDT Mar 20, 2026-6pm EDT Mar 27, 2026
 
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Additional Resources

Radar & Satellite Image

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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