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

Storm Moving from Western into Central U.S. through Wednesday

A storm system moving over the Rockies Wednesday will bring marginal risks for excessive rainfall and severe thunderstorms from parts of New Mexico into western South Dakota. Moderate snow is expected from northwestern Wyoming into southern Montana. Read More >

Current conditions at

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

Lat: 41.33°NLon: 72.05°WElev: 10ft.

Overcast

53°F

12°C

Humidity 100%
Wind Speed N 8 mph
Barometer 29.97 in (1014.7 mb)
Dewpoint 53°F (12°C)
Visibility 10.00 mi
Wind Chill50°F (10°C)
Last update 15 Oct 2:56 am EDT
Extended Forecast for

Old Lyme CT

  • Overnight

    Overnight: Mostly cloudy, with a steady temperature around 55. North wind around 5 mph.

    Low: 55 °F

    Mostly Cloudy

  • Wednesday

    Wednesday: Mostly sunny, with a high near 65. North wind 6 to 14 mph.

    High: 65 °F

    Mostly Sunny

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 41. North wind 10 to 14 mph, with gusts as high as 24 mph.

    Low: 41 °F

    Mostly Clear

  • Thursday

    Thursday: Sunny, with a high near 57. North wind 10 to 15 mph.

    High: 57 °F

    Sunny

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 42. North wind 10 to 14 mph, with gusts as high as 25 mph.

    Low: 42 °F

    Mostly Clear

  • Friday

    Friday: Sunny, with a high near 62.

    High: 62 °F

    Sunny

  • Friday Night

    Friday Night: Mostly clear, with a low around 42.

    Low: 42 °F

    Mostly Clear

  • Saturday

    Saturday: Sunny, with a high near 62.

    High: 62 °F

    Sunny

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around 50.

    Low: 50 °F

    Partly Cloudy

Detailed Forecast

Overnight
Mostly cloudy, with a steady temperature around 55. North wind around 5 mph.
Wednesday
Mostly sunny, with a high near 65. North wind 6 to 14 mph.
Wednesday Night
Mostly clear, with a low around 41. North wind 10 to 14 mph, with gusts as high as 24 mph.
Thursday
Sunny, with a high near 57. North wind 10 to 15 mph.
Thursday Night
Mostly clear, with a low around 42. North wind 10 to 14 mph, with gusts as high as 25 mph.
Friday
Sunny, with a high near 62.
Friday Night
Mostly clear, with a low around 42.
Saturday
Sunny, with a high near 62.
Saturday Night
Partly cloudy, with a low around 50.
Sunday
Mostly sunny, with a high near 66.
Sunday Night
Showers likely. Mostly cloudy, with a low around 56. Chance of precipitation is 60%.
Monday
Showers likely. Mostly cloudy, with a high near 64. Chance of precipitation is 60%.
Monday Night
A 50 percent chance of showers. Mostly cloudy, with a low around 52.
Tuesday
A 40 percent chance of showers. Partly sunny, with a high near 64.
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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:
1:35 am EDT Oct 15, 2025
Forecast Valid:
3am EDT Oct 15, 2025-6pm EDT Oct 21, 2025
 
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