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

24°C

75°F

Humidity 100%
Wind Speed S 19 km/h
Barometer 1017.1 mb (30.04 in)
Dewpoint 24°C (75°F)
Visibility 16 km
Last update 15 Jul 5:56 pm EDT
Extended Forecast for

3 Miles SSE South Lyme CT

Heat Advisory July 16, 11:00am until July 17, 10:00pm
Click here for hazard details and duration
Heat Advisory

  • Tonight

    Tonight: Patchy fog after 11pm. Otherwise, increasing clouds, with a low around 22. South wind 5 to 8 km/h becoming calm in the evening.

    Low: 22 °C

    Patchy Fog

  • Wednesday

    Wednesday: Patchy fog before 9am. Otherwise, mostly cloudy, then gradually becoming sunny, with a high near 28. Calm wind becoming south 5 to 10 km/h in the afternoon.

    High: 28 °C

    Patchy Fog
    then Mostly
    Sunny

  • Wednesday Night

    Wednesday Night: A 40 percent chance of showers and thunderstorms, mainly after 2am. Increasing clouds, with a low around 22. South wind around 10 km/h.

    Low: 22 °C

    Slight Chance
    T-storms then
    Chance
    Showers

  • Thursday

    Thursday: A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 2pm. Mostly cloudy, with a high near 28. Southwest wind 10 to 18 km/h. Chance of precipitation is 60%. New rainfall amounts between 2.5 and 5 mm possible.

    High: 28 °C

    Showers
    Likely

  • Thursday Night

    Thursday Night: Showers likely and possibly a thunderstorm before 8pm. Partly cloudy, with a low around 23. Southwest wind 10 to 13 km/h. Chance of precipitation is 60%.

    Low: 23 °C

    Showers
    Likely then
    Partly Cloudy

  • Friday

    Friday: Sunny, with a high near 28.

    High: 28 °C

    Sunny

  • Friday Night

    Friday Night: Mostly clear, with a low around 19.

    Low: 19 °C

    Mostly Clear

  • Saturday

    Saturday: Sunny, with a high near 26.

    High: 26 °C

    Sunny

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around 19.

    Low: 19 °C

    Partly Cloudy

Detailed Forecast

Tonight
Patchy fog after 11pm. Otherwise, increasing clouds, with a low around 22. South wind 5 to 8 km/h becoming calm in the evening.
Wednesday
Patchy fog before 9am. Otherwise, mostly cloudy, then gradually becoming sunny, with a high near 28. Calm wind becoming south 5 to 10 km/h in the afternoon.
Wednesday Night
A 40 percent chance of showers and thunderstorms, mainly after 2am. Increasing clouds, with a low around 22. South wind around 10 km/h.
Thursday
A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 2pm. Mostly cloudy, with a high near 28. Southwest wind 10 to 18 km/h. Chance of precipitation is 60%. New rainfall amounts between 2.5 and 5 mm possible.
Thursday Night
Showers likely and possibly a thunderstorm before 8pm. Partly cloudy, with a low around 23. Southwest wind 10 to 13 km/h. Chance of precipitation is 60%.
Friday
Sunny, with a high near 28.
Friday Night
Mostly clear, with a low around 19.
Saturday
Sunny, with a high near 26.
Saturday Night
Partly cloudy, with a low around 19.
Sunday
A 40 percent chance of showers. Partly sunny, with a high near 26.
Sunday Night
A 30 percent chance of showers. Mostly cloudy, with a low around 20.
Monday
Mostly sunny, with a high near 27.
Monday Night
Partly cloudy, with a low around 19.
Tuesday
Mostly sunny, with a high near 25.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
3 Miles SSE South Lyme CT
 41.28°N 72.27°W (Elev. 0 m)
Last Update:
3:16 pm EDT Jul 15, 2025
Forecast Valid:
6pm EDT Jul 15, 2025-6pm EDT Jul 22, 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