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.

Fog/Mist

35°F

2°C

Humidity 96%
Wind Speed NE 6 mph
Barometer 29.70 in (1005.6 mb)
Dewpoint 34°F (1°C)
Visibility 5.00 mi
Wind Chill30°F (-1°C)
Last update 7 Jan 12:56 am EST
Extended Forecast for

South Lyme CT

  • Overnight

    Overnight: Rain likely, mainly before 4am. Patchy fog. Otherwise, cloudy, with a steady temperature around 36. Calm wind. Chance of precipitation is 60%.

    Low: 36 °F

    Rain Likely
    and Patchy
    Fog

  • Wednesday

    Wednesday: A 30 percent chance of rain, mainly before 7am. Areas of fog before 7am. Otherwise, cloudy, then gradually becoming mostly sunny, with a high near 43. Calm wind becoming west 5 to 9 mph in the morning. Winds could gust as high as 21 mph.

    High: 43 °F

    Chance Rain
    and Areas Fog
    then Partly
    Sunny

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 30. Northwest wind 3 to 5 mph.

    Low: 30 °F

    Mostly Clear

  • Thursday

    Thursday: Sunny, with a high near 44. West wind around 6 mph becoming calm in the afternoon.

    High: 44 °F

    Sunny

  • Thursday Night

    Thursday Night: Mostly cloudy, with a low around 31. Calm wind.

    Low: 31 °F

    Mostly Cloudy

  • Friday

    Friday: Rain likely, mainly after 1pm. Mostly cloudy, with a high near 49. Chance of precipitation is 60%. New precipitation amounts of less than a tenth of an inch possible.

    High: 49 °F

    Chance Rain
    then Rain
    Likely

  • Friday Night

    Friday Night: A 40 percent chance of rain. Cloudy, with a low around 40.

    Low: 40 °F

    Chance Rain

  • Saturday

    Saturday: Rain. High near 48. Chance of precipitation is 80%.

    High: 48 °F

    Rain

  • Saturday Night

    Saturday Night: Rain, mainly before 1am. Low around 37. Chance of precipitation is 80%.

    Low: 37 °F

    Rain

Detailed Forecast

Overnight
Rain likely, mainly before 4am. Patchy fog. Otherwise, cloudy, with a steady temperature around 36. Calm wind. Chance of precipitation is 60%.
Wednesday
A 30 percent chance of rain, mainly before 7am. Areas of fog before 7am. Otherwise, cloudy, then gradually becoming mostly sunny, with a high near 43. Calm wind becoming west 5 to 9 mph in the morning. Winds could gust as high as 21 mph.
Wednesday Night
Mostly clear, with a low around 30. Northwest wind 3 to 5 mph.
Thursday
Sunny, with a high near 44. West wind around 6 mph becoming calm in the afternoon.
Thursday Night
Mostly cloudy, with a low around 31. Calm wind.
Friday
Rain likely, mainly after 1pm. Mostly cloudy, with a high near 49. Chance of precipitation is 60%. New precipitation amounts of less than a tenth of an inch possible.
Friday Night
A 40 percent chance of rain. Cloudy, with a low around 40.
Saturday
Rain. High near 48. Chance of precipitation is 80%.
Saturday Night
Rain, mainly before 1am. Low around 37. Chance of precipitation is 80%.
Sunday
A 40 percent chance of rain. Mostly cloudy, with a high near 46.
Sunday Night
Mostly cloudy, with a low around 28.
Monday
Mostly sunny, with a high near 40.
Monday Night
Partly cloudy, with a low around 29.
Tuesday
Mostly sunny, with a high near 42.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
South Lyme CT
 41.32°N 72.29°W (Elev. 98 ft)
Last Update:
1:40 pm EST Jan 6, 2026
Forecast Valid:
1am EST Jan 7, 2026-6pm EST Jan 13, 2026
 
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Additional Resources

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation