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.

Partly Cloudy

42°F

6°C

Humidity 71%
Wind Speed SW 6 mph
Barometer 30.39 in (1029.0 mb)
Dewpoint 33°F (1°C)
Visibility 10.00 mi
Wind Chill38°F (3°C)
Last update 30 Mar 12:56 am EDT
Extended Forecast for

3 Miles SE Old Lyme CT

  • Overnight

    Overnight: Mostly cloudy, with a low around 41. Southwest wind around 11 mph.

    Low: 41 °F

    Mostly Cloudy

  • Monday

    Monday: Partly sunny, with a high near 55. Southwest wind 13 to 15 mph.

    High: 55 °F

    Partly Sunny

  • Monday Night

    Monday Night: A 30 percent chance of rain after 2am. Mostly cloudy, with a low around 46. Southwest wind 6 to 11 mph.

    Low: 46 °F

    Mostly Cloudy
    then Chance
    Rain

  • Tuesday

    Tuesday: A 30 percent chance of rain before 2pm. Partly sunny, with a high near 58. Southwest wind 7 to 11 mph.

    High: 58 °F

    Chance Rain

  • Tuesday Night

    Tuesday Night: Mostly cloudy, with a low around 50. Southwest wind 11 to 15 mph.

    Low: 50 °F

    Mostly Cloudy

  • Wednesday

    Wednesday: Rain likely after 2pm. Partly sunny, with a high near 64. Chance of precipitation is 60%. New precipitation amounts of less than a tenth of an inch possible.

    High: 64 °F

    Partly Sunny
    then Rain
    Likely

  • Wednesday Night

    Wednesday Night: Rain likely and possibly a thunderstorm before 2am, then a chance of rain. Mostly cloudy, with a low around 43. Chance of precipitation is 60%.

    Low: 43 °F

    Rain Likely

  • Thursday

    Thursday: A 40 percent chance of rain. Mostly cloudy, with a high near 49.

    High: 49 °F

    Chance Rain

  • Thursday Night

    Thursday Night: Rain likely, mainly after 2am. Cloudy, with a low around 40. Chance of precipitation is 60%.

    Low: 40 °F

    Rain Likely

Detailed Forecast

Overnight
Mostly cloudy, with a low around 41. Southwest wind around 11 mph.
Monday
Partly sunny, with a high near 55. Southwest wind 13 to 15 mph.
Monday Night
A 30 percent chance of rain after 2am. Mostly cloudy, with a low around 46. Southwest wind 6 to 11 mph.
Tuesday
A 30 percent chance of rain before 2pm. Partly sunny, with a high near 58. Southwest wind 7 to 11 mph.
Tuesday Night
Mostly cloudy, with a low around 50. Southwest wind 11 to 15 mph.
Wednesday
Rain likely after 2pm. Partly sunny, with a high near 64. Chance of precipitation is 60%. New precipitation amounts of less than a tenth of an inch possible.
Wednesday Night
Rain likely and possibly a thunderstorm before 2am, then a chance of rain. Mostly cloudy, with a low around 43. Chance of precipitation is 60%.
Thursday
A 40 percent chance of rain. Mostly cloudy, with a high near 49.
Thursday Night
Rain likely, mainly after 2am. Cloudy, with a low around 40. Chance of precipitation is 60%.
Friday
Rain likely, mainly before 8am. Cloudy, with a high near 52. Chance of precipitation is 60%.
Friday Night
A 50 percent chance of rain. Cloudy, with a low around 39.
Saturday
A 30 percent chance of rain. Mostly cloudy, with a high near 51.
Saturday Night
A 40 percent chance of rain. Cloudy, with a low around 40.
Sunday
A 40 percent chance of rain. Mostly cloudy, with a high near 56.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
3 Miles SE Old Lyme CT
 41.28°N 72.3°W (Elev. 0 ft)
Last Update:
7:43 pm EDT Mar 29, 2026
Forecast Valid:
1am EDT Mar 30, 2026-6pm EDT Apr 5, 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