National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce

Hazardous Weather Conditions

Current conditions at

Groton / New London, Groton / New London Airport (KGON)

Lat: 41.33°NLon: 72.05°WElev: 10ft.

Fair

39°F

4°C

Humidity 79%
Wind Speed NW 9 mph
Barometer 29.76 in (1007.8 mb)
Dewpoint 33°F (1°C)
Visibility 10.00 mi
Wind Chill33°F (1°C)
Last update 14 Mar 5:56 am EDT
Extended Forecast for

South Lyme CT

  • Today

    Today: Mostly sunny, with a high near 46. Breezy, with a west wind 9 to 14 mph increasing to 16 to 21 mph in the morning. Winds could gust as high as 37 mph.

    High: 46 °F

    Mostly Sunny
    and Breezy

  • Tonight

    Tonight: Mostly clear, with a low around 29. Northwest wind 6 to 14 mph.

    Low: 29 °F

    Mostly Clear

  • Sunday

    Sunday: Partly sunny, with a high near 44. Calm wind becoming southeast 5 to 9 mph in the afternoon.

    High: 44 °F

    Partly Sunny

  • Sunday Night

    Sunday Night: Rain likely after 2am. Mostly cloudy, with a temperature falling to near 39 by 8pm, then rising to around 44 during the remainder of the night. Southeast wind 6 to 8 mph, with gusts as high as 24 mph. Chance of precipitation is 70%. New precipitation amounts between a quarter and half of an inch possible.

    Low: 39 °F⇑

    Mostly Cloudy
    then Rain
    Likely

  • Monday

    Monday: Rain and possibly a thunderstorm. Some of the storms could produce heavy rainfall. High near 58. South wind 14 to 17 mph, with gusts as high as 38 mph. Chance of precipitation is 100%. New rainfall amounts between three quarters and one inch possible.

    High: 58 °F

    Heavy Rain

  • Monday Night

    Monday Night: Rain and possibly a thunderstorm. Some of the storms could produce heavy rainfall. Low around 36. Breezy. Chance of precipitation is 100%. New precipitation amounts between a half and three quarters of an inch possible.

    Low: 36 °F

    Heavy Rain
    and Breezy

  • Tuesday

    Tuesday: Rain likely before 8am. Mostly cloudy, then gradually becoming sunny, with a high near 46. Chance of precipitation is 60%.

    High: 46 °F

    Rain Likely
    then Sunny

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 23.

    Low: 23 °F

    Mostly Clear

  • Wednesday

    Wednesday: Mostly sunny, with a high near 39.

    High: 39 °F

    Mostly Sunny

Detailed Forecast

Today
Mostly sunny, with a high near 46. Breezy, with a west wind 9 to 14 mph increasing to 16 to 21 mph in the morning. Winds could gust as high as 37 mph.
Tonight
Mostly clear, with a low around 29. Northwest wind 6 to 14 mph.
Sunday
Partly sunny, with a high near 44. Calm wind becoming southeast 5 to 9 mph in the afternoon.
Sunday Night
Rain likely after 2am. Mostly cloudy, with a temperature falling to near 39 by 8pm, then rising to around 44 during the remainder of the night. Southeast wind 6 to 8 mph, with gusts as high as 24 mph. Chance of precipitation is 70%. New precipitation amounts between a quarter and half of an inch possible.
Monday
Rain and possibly a thunderstorm. Some of the storms could produce heavy rainfall. High near 58. South wind 14 to 17 mph, with gusts as high as 38 mph. Chance of precipitation is 100%. New rainfall amounts between three quarters and one inch possible.
Monday Night
Rain and possibly a thunderstorm. Some of the storms could produce heavy rainfall. Low around 36. Breezy. Chance of precipitation is 100%. New precipitation amounts between a half and three quarters of an inch possible.
Tuesday
Rain likely before 8am. Mostly cloudy, then gradually becoming sunny, with a high near 46. Chance of precipitation is 60%.
Tuesday Night
Mostly clear, with a low around 23.
Wednesday
Mostly sunny, with a high near 39.
Wednesday Night
Mostly cloudy, with a low around 28.
Thursday
Mostly sunny, with a high near 44.
Thursday Night
Mostly clear, with a low around 31.
Friday
Mostly sunny, with a high near 48.
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ABOUT THIS FORECAST

 
Point Forecast:
South Lyme CT
 41.32°N 72.29°W (Elev. 98 ft)
Last Update:
3:09 am EDT Mar 14, 2026
Forecast Valid:
6am EDT Mar 14, 2026-6pm EDT Mar 20, 2026
 
Forecast Discussion
 
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Additional Resources

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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