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

Hazardous Weather Conditions

Current conditions at

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

Lat: 41.33°NLon: 72.05°WElev: 10ft.

Fair

70°F

21°C

Humidity 84%
Wind Speed W 6 mph
Barometer 30.11 in (1019.5 mb)
Dewpoint 65°F (18°C)
Visibility 10.00 mi
Last update 12 Aug 1:56 am EDT
Extended Forecast for

South Lyme CT

  • Overnight

    Overnight: Patchy fog. Otherwise, mostly clear, with a low around 65. Calm wind.

    Low: 65 °F

    Patchy Fog

  • Tuesday

    Tuesday: Patchy fog before 8am. Otherwise, sunny, with a high near 88. Calm wind becoming southwest 5 to 7 mph in the afternoon.

    High: 88 °F

    Patchy Fog
    then Sunny

  • Tuesday Night

    Tuesday Night: Patchy fog. Otherwise, partly cloudy, with a low around 67. Southwest wind around 5 mph becoming calm in the evening.

    Low: 67 °F

    Patchy Fog

  • Wednesday

    Wednesday: Patchy fog before 11am. Otherwise, mostly sunny, with a high near 86. Calm wind becoming south 5 to 9 mph in the morning.

    High: 86 °F

    Patchy Fog
    then Mostly
    Sunny

  • Wednesday Night

    Wednesday Night: A slight chance of showers and thunderstorms, then a chance of showers after 2am. Mostly cloudy, with a low around 70. Southwest wind around 5 mph becoming calm in the evening. Chance of precipitation is 40%.

    Low: 70 °F

    Slight Chance
    T-storms then
    Chance
    Showers

  • Thursday

    Thursday: A chance of showers, with thunderstorms also possible after 2pm. Partly sunny, with a high near 86. Chance of precipitation is 50%.

    High: 86 °F

    Chance
    Showers then
    Chance
    T-storms

  • Thursday Night

    Thursday Night: A chance of thunderstorms before 8pm. Partly cloudy, with a low around 67. Chance of precipitation is 30%.

    Low: 67 °F

    Chance
    T-storms then
    Mostly Clear

  • Friday

    Friday: Sunny, with a high near 85.

    High: 85 °F

    Sunny

  • Friday Night

    Friday Night: Mostly clear, with a low around 63.

    Low: 63 °F

    Mostly Clear

Detailed Forecast

Overnight
Patchy fog. Otherwise, mostly clear, with a low around 65. Calm wind.
Tuesday
Patchy fog before 8am. Otherwise, sunny, with a high near 88. Calm wind becoming southwest 5 to 7 mph in the afternoon.
Tuesday Night
Patchy fog. Otherwise, partly cloudy, with a low around 67. Southwest wind around 5 mph becoming calm in the evening.
Wednesday
Patchy fog before 11am. Otherwise, mostly sunny, with a high near 86. Calm wind becoming south 5 to 9 mph in the morning.
Wednesday Night
A slight chance of showers and thunderstorms, then a chance of showers after 2am. Mostly cloudy, with a low around 70. Southwest wind around 5 mph becoming calm in the evening. Chance of precipitation is 40%.
Thursday
A chance of showers, with thunderstorms also possible after 2pm. Partly sunny, with a high near 86. Chance of precipitation is 50%.
Thursday Night
A chance of thunderstorms before 8pm. Partly cloudy, with a low around 67. Chance of precipitation is 30%.
Friday
Sunny, with a high near 85.
Friday Night
Mostly clear, with a low around 63.
Saturday
Sunny, with a high near 84.
Saturday Night
Mostly clear, with a low around 67.
Sunday
Sunny, with a high near 88.
Sunday Night
Partly cloudy, with a low around 66.
Monday
Mostly sunny, with a high near 83.
Basemap Options
Click map to change the forecast location
Loading map...
Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
South Lyme CT
 41.32°N 72.29°W (Elev. 98 ft)
Last Update:
1:40 am EDT Aug 12, 2025
Forecast Valid:
2am EDT Aug 12, 2025-6pm EDT Aug 18, 2025
 
Forecast Discussion
 
Get as KML Get as XML

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