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.

Mostly Cloudy

36°F

2°C

Humidity 79%
Wind Speed Vrbl 3 mph
Barometer 30.62 in (1036.7 mb)
Dewpoint 30°F (-1°C)
Visibility 10.00 mi
Last update 9 Apr 2:56 am EDT
Extended Forecast for

South Lyme CT

  • Overnight

    Overnight: Patchy frost. Otherwise, partly cloudy, with a steady temperature around 35. South wind around 5 mph.

    Low: 35 °F

    Patchy Frost

  • Thursday

    Thursday: Patchy frost before 8am. Otherwise, sunny, with a high near 50. South wind 5 to 9 mph.

    High: 50 °F

    Patchy Frost
    then Sunny

  • Thursday Night

    Thursday Night: Patchy fog after 3am. Otherwise, partly cloudy, with a low around 36. South wind 5 to 9 mph becoming light southwest after midnight.

    Low: 36 °F

    Mostly Clear
    then Patchy
    Fog

  • Friday

    Friday: Patchy fog before 8am. Otherwise, mostly sunny, with a high near 55. Light southwest wind becoming south 5 to 9 mph in the morning.

    High: 55 °F

    Patchy Fog
    then Mostly
    Sunny

  • Friday Night

    Friday Night: Mostly cloudy, with a low around 42. South wind around 8 mph.

    Low: 42 °F

    Mostly Cloudy

  • Saturday

    Saturday: Partly sunny, then gradually becoming sunny, with a high near 60.

    High: 60 °F

    Becoming
    Sunny

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 38.

    Low: 38 °F

    Mostly Clear

  • Sunday

    Sunday: Mostly sunny, with a high near 54.

    High: 54 °F

    Mostly Sunny

  • Sunday Night

    Sunday Night: Mostly cloudy, with a low around 43.

    Low: 43 °F

    Mostly Cloudy

Detailed Forecast

Overnight
Patchy frost. Otherwise, partly cloudy, with a steady temperature around 35. South wind around 5 mph.
Thursday
Patchy frost before 8am. Otherwise, sunny, with a high near 50. South wind 5 to 9 mph.
Thursday Night
Patchy fog after 3am. Otherwise, partly cloudy, with a low around 36. South wind 5 to 9 mph becoming light southwest after midnight.
Friday
Patchy fog before 8am. Otherwise, mostly sunny, with a high near 55. Light southwest wind becoming south 5 to 9 mph in the morning.
Friday Night
Mostly cloudy, with a low around 42. South wind around 8 mph.
Saturday
Partly sunny, then gradually becoming sunny, with a high near 60.
Saturday Night
Mostly clear, with a low around 38.
Sunday
Mostly sunny, with a high near 54.
Sunday Night
Mostly cloudy, with a low around 43.
Monday
Mostly cloudy, with a high near 63.
Monday Night
Mostly cloudy, with a low around 52.
Tuesday
Mostly sunny, with a high near 72.
Tuesday Night
Mostly cloudy, with a low around 55.
Wednesday
Partly sunny, with a high near 71.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
South Lyme CT
 41.32°N 72.29°W (Elev. 98 ft)
Last Update:
3:30 am EDT Apr 9, 2026
Forecast Valid:
3am EDT Apr 9, 2026-6pm EDT Apr 15, 2026
 
Forecast Discussion
 
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Additional Resources

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Hourly Weather Forecast

National Digital Forecast Database

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation