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

24°F

-4°C

Humidity 30%
Wind Speed S 6 mph
Barometer 30.64 in (1037.4 mb)
Dewpoint -3°F (-19°C)
Visibility 10.00 mi
Wind Chill17°F (-8°C)
Last update 2 Mar 1:56 pm EST
Extended Forecast for

3 Miles SE Old Lyme CT

  • This Afternoon

    This Afternoon: Sunny, with a high near 30. Calm wind.

    High: 30 °F

    Sunny

  • Tonight

    Tonight: Increasing clouds, with a low around 22. Calm wind.

    Low: 22 °F

    Increasing
    Clouds

  • Tuesday

    Tuesday: Rain, possibly mixed with snow, becoming all rain after 4pm. High near 37. Wind chill values between 25 and 30. Southeast wind 3 to 8 mph. Chance of precipitation is 90%. Little or no snow accumulation expected.

    High: 37 °F

    Chance
    Rain/Snow
    then
    Rain/Snow

  • Tuesday Night

    Tuesday Night: Rain. Low around 36. East wind around 6 mph becoming west after midnight. Chance of precipitation is 100%. New precipitation amounts between a quarter and half of an inch possible.

    Low: 36 °F

    Rain

  • Wednesday

    Wednesday: Mostly sunny, with a high near 47. Light and variable wind.

    High: 47 °F

    Mostly Sunny

  • Wednesday Night

    Wednesday Night: A 30 percent chance of rain after 1am. Mostly cloudy, with a low around 33.

    Low: 33 °F

    Mostly Cloudy
    then Chance
    Rain

  • Thursday

    Thursday: A 40 percent chance of rain. Cloudy, with a high near 45.

    High: 45 °F

    Chance Rain

  • Thursday Night

    Thursday Night: Rain likely, mainly after 1am. Cloudy, with a low around 36. Chance of precipitation is 70%.

    Low: 36 °F

    Chance Rain
    then Rain
    Likely

  • Friday

    Friday: A 50 percent chance of rain before 1pm. Mostly cloudy, with a high near 44.

    High: 44 °F

    Chance Rain

Detailed Forecast

This Afternoon
Sunny, with a high near 30. Calm wind.
Tonight
Increasing clouds, with a low around 22. Calm wind.
Tuesday
Rain, possibly mixed with snow, becoming all rain after 4pm. High near 37. Wind chill values between 25 and 30. Southeast wind 3 to 8 mph. Chance of precipitation is 90%. Little or no snow accumulation expected.
Tuesday Night
Rain. Low around 36. East wind around 6 mph becoming west after midnight. Chance of precipitation is 100%. New precipitation amounts between a quarter and half of an inch possible.
Wednesday
Mostly sunny, with a high near 47. Light and variable wind.
Wednesday Night
A 30 percent chance of rain after 1am. Mostly cloudy, with a low around 33.
Thursday
A 40 percent chance of rain. Cloudy, with a high near 45.
Thursday Night
Rain likely, mainly after 1am. Cloudy, with a low around 36. Chance of precipitation is 70%.
Friday
A 50 percent chance of rain before 1pm. Mostly cloudy, with a high near 44.
Friday Night
Cloudy, with a low around 35.
Saturday
Mostly cloudy, with a high near 48.
Saturday Night
A 50 percent chance of rain. Mostly cloudy, with a low around 42.
Sunday
A 30 percent chance of rain. Mostly cloudy, with a high near 56.
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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:
1:04 pm EST Mar 2, 2026
Forecast Valid:
2pm EST Mar 2, 2026-6pm EDT Mar 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