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.

Light Rain Fog/Mist

66°F

19°C

Humidity 93%
Wind Speed N 14 G 30 mph
Barometer 29.97 in (1014.7 mb)
Dewpoint 64°F (18°C)
Visibility 3.00 mi
Last update 7 Jul 6:56 pm EDT
Extended Forecast for

Old Lyme CT

  • Tonight

    Tonight: A 40 percent chance of rain before 8pm. Patchy fog before 8pm. Otherwise, mostly cloudy, with a low around 60. North wind 3 to 7 mph.

    Low: 60 °F

    Chance Rain
    and Patchy
    Fog then
    Mostly Cloudy

  • Wednesday

    Wednesday: Sunny, with a high near 78. North wind around 5 mph becoming light and variable in the morning.

    High: 78 °F

    Sunny

  • Wednesday Night

    Wednesday Night: Increasing clouds, with a low around 65. Calm wind.

    Low: 65 °F

    Increasing
    Clouds

  • Thursday

    Thursday: Mostly sunny, with a high near 81. Southwest wind 5 to 9 mph.

    High: 81 °F

    Mostly Sunny

  • Thursday Night

    Thursday Night: A chance of showers and thunderstorms before 11pm, then a chance of showers between 11pm and 2am. Mostly cloudy, with a low around 68. Southwest wind around 6 mph becoming calm in the evening. Chance of precipitation is 40%.

    Low: 68 °F

    Chance
    Showers

  • Friday

    Friday: A 50 percent chance of showers and thunderstorms after 2pm. Partly sunny, with a high near 86.

    High: 86 °F

    Mostly Sunny
    then Chance
    T-storms

  • Friday Night

    Friday Night: A 30 percent chance of showers and thunderstorms before 8pm. Mostly cloudy, with a low around 67.

    Low: 67 °F

    Chance
    T-storms then
    Partly Cloudy

  • Saturday

    Saturday: Mostly sunny, with a high near 82.

    High: 82 °F

    Mostly Sunny

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 64.

    Low: 64 °F

    Mostly Clear

Detailed Forecast

Tonight
A 40 percent chance of rain before 8pm. Patchy fog before 8pm. Otherwise, mostly cloudy, with a low around 60. North wind 3 to 7 mph.
Wednesday
Sunny, with a high near 78. North wind around 5 mph becoming light and variable in the morning.
Wednesday Night
Increasing clouds, with a low around 65. Calm wind.
Thursday
Mostly sunny, with a high near 81. Southwest wind 5 to 9 mph.
Thursday Night
A chance of showers and thunderstorms before 11pm, then a chance of showers between 11pm and 2am. Mostly cloudy, with a low around 68. Southwest wind around 6 mph becoming calm in the evening. Chance of precipitation is 40%.
Friday
A 50 percent chance of showers and thunderstorms after 2pm. Partly sunny, with a high near 86.
Friday Night
A 30 percent chance of showers and thunderstorms before 8pm. Mostly cloudy, with a low around 67.
Saturday
Mostly sunny, with a high near 82.
Saturday Night
Mostly clear, with a low around 64.
Sunday
Sunny, with a high near 83.
Sunday Night
Partly cloudy, with a low around 66.
Monday
Sunny, with a high near 84.
Monday Night
Partly cloudy, with a low around 67.
Tuesday
Sunny, with a high near 88.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Old Lyme CT
 41.31°N 72.33°W (Elev. 43 ft)
Last Update:
3:01 pm EDT Jul 7, 2026
Forecast Valid:
7pm EDT Jul 7, 2026-6pm EDT Jul 14, 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