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

34°F

1°C

Humidity 50%
Wind Speed SW 14 G 23 mph
Barometer 30.10 in (1019.3 mb)
Dewpoint 17°F (-8°C)
Visibility 10.00 mi
Wind Chill25°F (-4°C)
Last update 16 Jan 10:56 pm EST
Extended Forecast for

South Lyme CT

  • Tonight

    Tonight: A 20 percent chance of snow after 4am. Mostly cloudy, with a temperature rising to around 33 by 5am. Light south wind.

    Low: 29 °F⇑

    Slight Chance
    Snow

  • Saturday

    Saturday: A chance of snow before 10am, then rain likely between 10am and 4pm, then a chance of rain and snow after 4pm. Mostly cloudy, with a high near 43. Southwest wind 3 to 8 mph. Chance of precipitation is 60%. Little or no snow accumulation expected.

    High: 43 °F

    Rain/Snow
    Likely

  • Saturday Night

    Saturday Night: A chance of rain and snow before 7pm, then a slight chance of snow after 1am. Mostly cloudy, with a low around 30. Light west wind. Chance of precipitation is 30%.

    Low: 30 °F

    Chance
    Rain/Snow
    then Slight
    Chance Snow

  • Sunday

    Sunday: Snow likely, mainly after 1pm. Cloudy, with a high near 38. Calm wind becoming west around 6 mph. Chance of precipitation is 60%. New snow accumulation of around an inch possible.

    High: 38 °F

    Snow Likely

  • Sunday Night

    Sunday Night: A 30 percent chance of snow before 1am. Cloudy during the early evening, then gradual clearing, with a low around 21. Calm wind becoming west around 5 mph after midnight.

    Low: 21 °F

    Chance Snow

  • M.L.King Day

    M.L.King Day: Sunny, with a high near 34.

    High: 34 °F

    Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 13.

    Low: 13 °F

    Mostly Clear

  • Tuesday

    Tuesday: Sunny, with a high near 22.

    High: 22 °F

    Sunny

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 13.

    Low: 13 °F

    Mostly Clear

Detailed Forecast

Tonight
A 20 percent chance of snow after 4am. Mostly cloudy, with a temperature rising to around 33 by 5am. Light south wind.
Saturday
A chance of snow before 10am, then rain likely between 10am and 4pm, then a chance of rain and snow after 4pm. Mostly cloudy, with a high near 43. Southwest wind 3 to 8 mph. Chance of precipitation is 60%. Little or no snow accumulation expected.
Saturday Night
A chance of rain and snow before 7pm, then a slight chance of snow after 1am. Mostly cloudy, with a low around 30. Light west wind. Chance of precipitation is 30%.
Sunday
Snow likely, mainly after 1pm. Cloudy, with a high near 38. Calm wind becoming west around 6 mph. Chance of precipitation is 60%. New snow accumulation of around an inch possible.
Sunday Night
A 30 percent chance of snow before 1am. Cloudy during the early evening, then gradual clearing, with a low around 21. Calm wind becoming west around 5 mph after midnight.
M.L.King Day
Sunny, with a high near 34.
Monday Night
Mostly clear, with a low around 13.
Tuesday
Sunny, with a high near 22.
Tuesday Night
Mostly clear, with a low around 13.
Wednesday
Mostly sunny, with a high near 32.
Wednesday Night
Mostly cloudy, with a low around 23.
Thursday
Mostly cloudy, with a high near 38.
Thursday Night
A 30 percent chance of snow. Mostly cloudy, with a low around 19.
Friday
A 30 percent chance of snow. Mostly sunny, with a high near 32.
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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:
3:33 pm EST Jan 16, 2026
Forecast Valid:
11pm EST Jan 16, 2026-6pm EST Jan 23, 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