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.

Fair

69°F

21°C

Humidity 68%
Wind Speed W 8 mph
Barometer 30.04 in (1017.2 mb)
Dewpoint 58°F (14°C)
Visibility 10.00 mi
Last update 17 May 8:56 pm EDT
Extended Forecast for

3 Miles SSE South Lyme CT

  • Tonight

    Tonight: Mostly clear, with a low around 59. Southwest wind around 6 mph becoming calm in the evening.

    Low: 59 °F

    Mostly Clear

  • Monday

    Monday: Mostly sunny, with a high near 73. East wind 6 to 8 mph.

    High: 73 °F

    Mostly Sunny

  • Monday Night

    Monday Night: Partly cloudy, with a low around 59. Calm wind becoming southwest around 5 mph after midnight.

    Low: 59 °F

    Partly Cloudy

  • Tuesday

    Tuesday: Mostly sunny, with a high near 83. Southwest wind 5 to 10 mph.

    High: 83 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: Partly cloudy, with a low around 63. Southwest wind around 9 mph.

    Low: 63 °F

    Partly Cloudy

  • Wednesday

    Wednesday: Showers likely after 2pm. Sunny, then becoming mostly cloudy during the afternoon, with a high near 82. Chance of precipitation is 70%. New precipitation amounts of less than a tenth of an inch possible.

    High: 82 °F

    Mostly Sunny
    then Showers
    Likely

  • Wednesday Night

    Wednesday Night: Showers likely before 8pm. Mostly cloudy, with a low around 54. Chance of precipitation is 60%.

    Low: 54 °F

    Showers
    Likely then
    Mostly Cloudy

  • Thursday

    Thursday: Partly sunny, with a high near 67.

    High: 67 °F

    Partly Sunny

  • Thursday Night

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

    Low: 50 °F

    Partly Cloudy

Detailed Forecast

Tonight
Mostly clear, with a low around 59. Southwest wind around 6 mph becoming calm in the evening.
Monday
Mostly sunny, with a high near 73. East wind 6 to 8 mph.
Monday Night
Partly cloudy, with a low around 59. Calm wind becoming southwest around 5 mph after midnight.
Tuesday
Mostly sunny, with a high near 83. Southwest wind 5 to 10 mph.
Tuesday Night
Partly cloudy, with a low around 63. Southwest wind around 9 mph.
Wednesday
Showers likely after 2pm. Sunny, then becoming mostly cloudy during the afternoon, with a high near 82. Chance of precipitation is 70%. New precipitation amounts of less than a tenth of an inch possible.
Wednesday Night
Showers likely before 8pm. Mostly cloudy, with a low around 54. Chance of precipitation is 60%.
Thursday
Partly sunny, with a high near 67.
Thursday Night
Partly cloudy, with a low around 50.
Friday
Partly sunny, with a high near 63.
Friday Night
A 40 percent chance of showers. Mostly cloudy, with a low around 50.
Saturday
A 50 percent chance of showers. Mostly cloudy, with a high near 63.
Saturday Night
A 50 percent chance of showers. Mostly cloudy, with a low around 52.
Sunday
A 50 percent chance of showers. Mostly cloudy, with a high near 66.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
3 Miles SSE South Lyme CT
 41.3°N 72.27°W (Elev. 75 ft)
Last Update:
3:04 pm EDT May 17, 2026
Forecast Valid:
9pm EDT May 17, 2026-6pm EDT May 24, 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