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

64°F

18°C

Humidity 93%
Wind Speed E 12 G 23 mph
Barometer 29.96 in (1014.4 mb)
Dewpoint 62°F (17°C)
Visibility 10.00 mi
Last update 22 Jun 9:56 pm EDT
Extended Forecast for

Old Lyme CT

  • Tonight

    Tonight: Showers and possibly a thunderstorm. Steady temperature around 66. South wind 6 to 8 mph. Chance of precipitation is 90%. New rainfall amounts between a quarter and half of an inch possible.

    Low: 66 °F

    Showers

  • Tuesday

    Tuesday: Showers and possibly a thunderstorm. High near 73. South wind 5 to 7 mph becoming northwest in the afternoon. Chance of precipitation is 80%. New rainfall amounts between a half and three quarters of an inch possible.

    High: 73 °F

    Showers

  • Tuesday Night

    Tuesday Night: Showers likely, mainly before 8pm. Cloudy, then gradually becoming partly cloudy, with a low around 61. North wind 3 to 6 mph. Chance of precipitation is 60%. New precipitation amounts between a tenth and quarter of an inch possible.

    Low: 61 °F

    Showers
    Likely then
    Partly Cloudy

  • Wednesday

    Wednesday: Sunny, with a high near 81. West wind 3 to 7 mph.

    High: 81 °F

    Sunny

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 62. Calm wind.

    Low: 62 °F

    Mostly Clear

  • Thursday

    Thursday: Sunny, with a high near 80.

    High: 80 °F

    Sunny

  • Thursday Night

    Thursday Night: A 50 percent chance of showers after 2am. Partly cloudy, with a low around 63.

    Low: 63 °F

    Partly Cloudy
    then Chance
    Showers

  • Friday

    Friday: A 40 percent chance of showers before 2pm. Partly sunny, with a high near 78.

    High: 78 °F

    Chance
    Showers

  • Friday Night

    Friday Night: A 30 percent chance of showers after 2am. Mostly cloudy, with a low around 64.

    Low: 64 °F

    Partly Cloudy
    then Chance
    Showers

Detailed Forecast

Tonight
Showers and possibly a thunderstorm. Steady temperature around 66. South wind 6 to 8 mph. Chance of precipitation is 90%. New rainfall amounts between a quarter and half of an inch possible.
Tuesday
Showers and possibly a thunderstorm. High near 73. South wind 5 to 7 mph becoming northwest in the afternoon. Chance of precipitation is 80%. New rainfall amounts between a half and three quarters of an inch possible.
Tuesday Night
Showers likely, mainly before 8pm. Cloudy, then gradually becoming partly cloudy, with a low around 61. North wind 3 to 6 mph. Chance of precipitation is 60%. New precipitation amounts between a tenth and quarter of an inch possible.
Wednesday
Sunny, with a high near 81. West wind 3 to 7 mph.
Wednesday Night
Mostly clear, with a low around 62. Calm wind.
Thursday
Sunny, with a high near 80.
Thursday Night
A 50 percent chance of showers after 2am. Partly cloudy, with a low around 63.
Friday
A 40 percent chance of showers before 2pm. Partly sunny, with a high near 78.
Friday Night
A 30 percent chance of showers after 2am. Mostly cloudy, with a low around 64.
Saturday
A 50 percent chance of showers. Partly sunny, with a high near 77.
Saturday Night
A 30 percent chance of showers. Partly cloudy, with a low around 63.
Sunday
Mostly sunny, with a high near 80.
Sunday Night
Mostly clear, with a low around 63.
Monday
Mostly sunny, with a high near 81.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Old Lyme CT
 41.29°N 72.33°W (Elev. 16 ft)
Last Update:
8:23 pm EDT Jun 22, 2026
Forecast Valid:
10pm EDT Jun 22, 2026-6pm EDT Jun 29, 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