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

8°C

46°F

Humidity 86%
Wind Speed S 11 km/h
Barometer 1023.9 mb (30.24 in)
Dewpoint 6°C (42°F)
Visibility 16 km
Wind Chill6°C (42°F)
Last update 13 Apr 4:56 am EDT
Extended Forecast for

Old Lyme CT

  • Today

    Today: A 20 percent chance of showers before 11am. Mostly cloudy, with a high near 16. Southwest wind 11 to 16 km/h increasing to 19 to 24 km/h in the afternoon. Winds could gust as high as 47 km/h.

    High: 16 °C

    Slight Chance
    Showers then
    Mostly Cloudy

  • Tonight

    Tonight: Partly cloudy, with a low around 11. Southwest wind 5 to 13 km/h, with gusts as high as 34 km/h.

    Low: 11 °C

    Partly Cloudy

  • Tuesday

    Tuesday: Mostly sunny, with a high near 22. Light west wind becoming south 6 to 11 km/h in the afternoon.

    High: 22 °C

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: A 20 percent chance of showers before 2am. Mostly cloudy, with a low around 11. Southwest wind 3 to 8 km/h.

    Low: 11 °C

    Slight Chance
    Showers

  • Wednesday

    Wednesday: A 30 percent chance of showers after 2pm. Partly sunny, with a high near 23. Light southwest wind increasing to 8 to 13 km/h in the morning.

    High: 23 °C

    Mostly Sunny
    then Chance
    Showers

  • Wednesday Night

    Wednesday Night: A 40 percent chance of showers before 2am. Mostly cloudy, with a low around 13.

    Low: 13 °C

    Chance
    Showers

  • Thursday

    Thursday: Mostly cloudy, with a high near 21.

    High: 21 °C

    Mostly Cloudy

  • Thursday Night

    Thursday Night: Mostly cloudy, with a low around 12.

    Low: 12 °C

    Mostly Cloudy

  • Friday

    Friday: A 30 percent chance of showers after 2pm. Partly sunny, with a high near 22.

    High: 22 °C

    Partly Sunny
    then Chance
    Showers

Detailed Forecast

Today
A 20 percent chance of showers before 11am. Mostly cloudy, with a high near 16. Southwest wind 11 to 16 km/h increasing to 19 to 24 km/h in the afternoon. Winds could gust as high as 47 km/h.
Tonight
Partly cloudy, with a low around 11. Southwest wind 5 to 13 km/h, with gusts as high as 34 km/h.
Tuesday
Mostly sunny, with a high near 22. Light west wind becoming south 6 to 11 km/h in the afternoon.
Tuesday Night
A 20 percent chance of showers before 2am. Mostly cloudy, with a low around 11. Southwest wind 3 to 8 km/h.
Wednesday
A 30 percent chance of showers after 2pm. Partly sunny, with a high near 23. Light southwest wind increasing to 8 to 13 km/h in the morning.
Wednesday Night
A 40 percent chance of showers before 2am. Mostly cloudy, with a low around 13.
Thursday
Mostly cloudy, with a high near 21.
Thursday Night
Mostly cloudy, with a low around 12.
Friday
A 30 percent chance of showers after 2pm. Partly sunny, with a high near 22.
Friday Night
A 30 percent chance of showers before 8pm. Partly cloudy, with a low around 11.
Saturday
Mostly sunny, with a high near 18.
Saturday Night
A 30 percent chance of showers. Mostly cloudy, with a low around 9.
Sunday
A 40 percent chance of showers. Mostly cloudy, with a high near 18.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Old Lyme CT
 41.31°N 72.33°W (Elev. 43 m)
Last Update:
3:02 am EDT Apr 13, 2026
Forecast Valid:
5am EDT Apr 13, 2026-6pm EDT Apr 19, 2026
 
Forecast Discussion
 
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Additional Resources

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Link to Local Radar Data Link to Satellite Data

Hourly Weather Forecast

National Digital Forecast Database

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation