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.

Rain Fog/Mist

43°F

6°C

Humidity 89%
Wind Speed NE 13 mph
Barometer 30.34 in (1027.2 mb)
Dewpoint 40°F (4°C)
Visibility 4.00 mi
Wind Chill36°F (2°C)
Last update 2 Apr 2:56 am EDT
Extended Forecast for

South Lyme CT

  • Overnight

    Overnight: Showers. Low around 40. Northeast wind around 9 mph. Chance of precipitation is 90%. New precipitation amounts of less than a tenth of an inch possible.

    Low: 40 °F

    Showers

  • Thursday

    Thursday: Showers likely before 11am. Cloudy, with a high near 43. Northeast wind around 11 mph. Chance of precipitation is 70%. New precipitation amounts of less than a tenth of an inch possible.

    High: 43 °F

    Showers
    Likely then
    Mostly Cloudy

  • Thursday Night

    Thursday Night: A chance of drizzle or light rain, mainly after 2am. Patchy fog. Otherwise, cloudy, with a low around 38. East wind 5 to 8 mph. Chance of precipitation is 30%.

    Low: 38 °F

    Chance Light
    Rain and
    Patchy Fog

  • Friday

    Friday: A chance of drizzle or light rain, mainly before 11am. Areas of fog before 2pm. Otherwise, mostly cloudy, with a high near 55. Southeast wind 3 to 7 mph. Chance of precipitation is 30%.

    High: 55 °F

    Chance Light
    Rain and
    Areas Fog

  • Friday Night

    Friday Night: Mostly cloudy, with a low around 49. Southeast wind 6 to 9 mph becoming southwest after midnight.

    Low: 49 °F

    Mostly Cloudy

  • Saturday

    Saturday: Partly sunny, with a high near 64.

    High: 64 °F

    Partly Sunny

  • Saturday Night

    Saturday Night: A 30 percent chance of showers after 2am. Mostly cloudy, with a low around 42.

    Low: 42 °F

    Mostly Cloudy
    then Chance
    Showers

  • Sunday

    Sunday: Showers, mainly after 8am. High near 59. Chance of precipitation is 90%.

    High: 59 °F

    Showers

  • Sunday Night

    Sunday Night: Mostly cloudy, with a low around 39.

    Low: 39 °F

    Mostly Cloudy

Detailed Forecast

Overnight
Showers. Low around 40. Northeast wind around 9 mph. Chance of precipitation is 90%. New precipitation amounts of less than a tenth of an inch possible.
Thursday
Showers likely before 11am. Cloudy, with a high near 43. Northeast wind around 11 mph. Chance of precipitation is 70%. New precipitation amounts of less than a tenth of an inch possible.
Thursday Night
A chance of drizzle or light rain, mainly after 2am. Patchy fog. Otherwise, cloudy, with a low around 38. East wind 5 to 8 mph. Chance of precipitation is 30%.
Friday
A chance of drizzle or light rain, mainly before 11am. Areas of fog before 2pm. Otherwise, mostly cloudy, with a high near 55. Southeast wind 3 to 7 mph. Chance of precipitation is 30%.
Friday Night
Mostly cloudy, with a low around 49. Southeast wind 6 to 9 mph becoming southwest after midnight.
Saturday
Partly sunny, with a high near 64.
Saturday Night
A 30 percent chance of showers after 2am. Mostly cloudy, with a low around 42.
Sunday
Showers, mainly after 8am. High near 59. Chance of precipitation is 90%.
Sunday Night
Mostly cloudy, with a low around 39.
Monday
Mostly sunny, with a high near 54.
Monday Night
Mostly clear, with a low around 35.
Tuesday
A 30 percent chance of showers. Mostly sunny, with a high near 50.
Tuesday Night
A 30 percent chance of showers. Partly cloudy, with a low around 30.
Wednesday
Sunny, with a high near 48.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
South Lyme CT
 41.32°N 72.29°W (Elev. 98 ft)
Last Update:
2:20 am EDT Apr 2, 2026
Forecast Valid:
3am EDT Apr 2, 2026-6pm EDT Apr 8, 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