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.

Fog

45°F

7°C

Humidity 100%
Wind Speed SW 6 mph
Barometer 29.53 in (1000.1 mb)
Dewpoint 45°F (7°C)
Visibility 0.15 mi
Wind Chill42°F (6°C)
Last update 12 Mar 7:56 am EDT
Extended Forecast for

Old Lyme CT

  • Today

    Today: Rain likely before 4pm, then rain and snow. Temperature falling to around 39 by 5pm. West wind 5 to 15 mph becoming northwest in the afternoon. Winds could gust as high as 25 mph. Chance of precipitation is 80%. Little or no snow accumulation expected.

    High: 47 °F⇓

    Rain Likely
    then
    Rain/Snow

  • Tonight

    Tonight: Snow, possibly mixed with rain, becoming all snow after 7pm, then gradually ending. Low around 28. Northwest wind around 6 mph, with gusts as high as 20 mph. Chance of precipitation is 80%. Little or no snow accumulation expected.

    Low: 28 °F

    Rain/Snow
    then Mostly
    Clear

  • Friday

    Friday: Increasing clouds, with a high near 44. Calm wind becoming south 5 to 9 mph in the afternoon. Winds could gust as high as 21 mph.

    High: 44 °F

    Increasing
    Clouds

  • Friday Night

    Friday Night: Mostly cloudy, then gradually becoming mostly clear, with a low around 35. South wind around 7 mph, with gusts as high as 23 mph.

    Low: 35 °F

    Decreasing
    Clouds

  • Saturday

    Saturday: Sunny, with a high near 49. West wind 9 to 13 mph, with gusts as high as 25 mph.

    High: 49 °F

    Sunny

  • Saturday Night

    Saturday Night: Increasing clouds, with a low around 30.

    Low: 30 °F

    Increasing
    Clouds

  • Sunday

    Sunday: Mostly cloudy, with a high near 46.

    High: 46 °F

    Mostly Cloudy

  • Sunday Night

    Sunday Night: Rain likely, mainly after 2am. Cloudy, with a low around 37. Chance of precipitation is 70%.

    Low: 37 °F

    Chance Rain
    then Rain
    Likely

  • Monday

    Monday: Rain. High near 57. Chance of precipitation is 90%.

    High: 57 °F

    Rain

Detailed Forecast

Today
Rain likely before 4pm, then rain and snow. Temperature falling to around 39 by 5pm. West wind 5 to 15 mph becoming northwest in the afternoon. Winds could gust as high as 25 mph. Chance of precipitation is 80%. Little or no snow accumulation expected.
Tonight
Snow, possibly mixed with rain, becoming all snow after 7pm, then gradually ending. Low around 28. Northwest wind around 6 mph, with gusts as high as 20 mph. Chance of precipitation is 80%. Little or no snow accumulation expected.
Friday
Increasing clouds, with a high near 44. Calm wind becoming south 5 to 9 mph in the afternoon. Winds could gust as high as 21 mph.
Friday Night
Mostly cloudy, then gradually becoming mostly clear, with a low around 35. South wind around 7 mph, with gusts as high as 23 mph.
Saturday
Sunny, with a high near 49. West wind 9 to 13 mph, with gusts as high as 25 mph.
Saturday Night
Increasing clouds, with a low around 30.
Sunday
Mostly cloudy, with a high near 46.
Sunday Night
Rain likely, mainly after 2am. Cloudy, with a low around 37. Chance of precipitation is 70%.
Monday
Rain. High near 57. Chance of precipitation is 90%.
Monday Night
Rain likely, mainly before 2am. Cloudy, with a low around 32. Chance of precipitation is 70%.
Tuesday
A 30 percent chance of rain. Mostly sunny, with a high near 42.
Tuesday Night
Mostly clear, with a low around 23.
Wednesday
Mostly sunny, with a high near 39.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Old Lyme CT
 41.31°N 72.36°W (Elev. 30 ft)
Last Update:
7:04 am EDT Mar 12, 2026
Forecast Valid:
8am EDT Mar 12, 2026-6pm EDT Mar 18, 2026
 
Forecast Discussion
 
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Additional Resources

Radar & Satellite Image

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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