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.

Fog/Mist

62°F

17°C

Humidity 100%
Wind Speed Calm
Barometer 29.96 in (1014.6 mb)
Dewpoint 62°F (17°C)
Visibility 4.00 mi
Last update 18 Jun 4:56 am EDT
Extended Forecast for

2 Miles SE Old Lyme CT

Dense Fog Advisory until June 18, 07:00am
Click here for hazard details and duration
Dense Fog Advisory
  •  
    Dense Fog Advisory until June 18, 07:00am

    NOW until 7:00am Wed

    Dense Fog Advisory

  • Overnight

    Low: 64 °F

    Showers
    Likely and
    Dense Fog

  • Wednesday

    Wednesday: Showers likely, with thunderstorms also possible after 2pm. Widespread dense fog, mainly before 7am. Otherwise, cloudy, with a high near 74. South wind 3 to 6 mph. Chance of precipitation is 60%.

    High: 74 °F

    Showers
    Likely and
    Dense Fog
    then Chance
    Showers

  • Wednesday Night

    Wednesday Night: A chance of showers and thunderstorms before 11pm, then a slight chance of showers between 11pm and 2am. Cloudy, with a low around 65. Light and variable wind. Chance of precipitation is 30%.

    Low: 65 °F

    Chance
    Showers

  • Juneteenth

    Juneteenth: A 30 percent chance of showers and thunderstorms after 2pm. Some of the storms could be severe. Partly sunny, with a high near 81. South wind 5 to 11 mph, with gusts as high as 21 mph.

    High: 81 °F

    Partly Sunny
    then Severe
    Thunderstorms

  • Thursday Night

    Thursday Night: A chance of showers and thunderstorms before 11pm, then a chance of showers between 11pm and 2am. Some of the storms could be severe. Cloudy, then gradually becoming partly cloudy, with a low around 65. Southwest wind around 10 mph. Chance of precipitation is 40%.

    Low: 65 °F

    Severe
    Thunderstorms
    then Chance
    Showers

  • Friday

    Friday: Sunny, with a high near 80.

    High: 80 °F

    Sunny

  • Friday Night

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

    Low: 63 °F

    Mostly Clear

  • Saturday

    Saturday: Sunny, with a high near 80.

    High: 80 °F

    Sunny

Detailed Forecast

Overnight
Showers likely. Widespread dense fog. Otherwise, cloudy, with a low around 64. Light southeast wind. Chance of precipitation is 60%.
Wednesday
Showers likely, with thunderstorms also possible after 2pm. Widespread dense fog, mainly before 7am. Otherwise, cloudy, with a high near 74. South wind 3 to 6 mph. Chance of precipitation is 60%.
Wednesday Night
A chance of showers and thunderstorms before 11pm, then a slight chance of showers between 11pm and 2am. Cloudy, with a low around 65. Light and variable wind. Chance of precipitation is 30%.
Juneteenth
A 30 percent chance of showers and thunderstorms after 2pm. Some of the storms could be severe. Partly sunny, with a high near 81. South wind 5 to 11 mph, with gusts as high as 21 mph.
Thursday Night
A chance of showers and thunderstorms before 11pm, then a chance of showers between 11pm and 2am. Some of the storms could be severe. Cloudy, then gradually becoming partly cloudy, with a low around 65. Southwest wind around 10 mph. Chance of precipitation is 40%.
Friday
Sunny, with a high near 80.
Friday Night
Mostly clear, with a low around 63.
Saturday
Sunny, with a high near 80.
Saturday Night
Mostly cloudy, with a low around 66.
Sunday
Mostly sunny, with a high near 82.
Sunday Night
Partly cloudy, with a low around 67.
Monday
Sunny, with a high near 86.
Monday Night
Mostly clear, with a low around 69.
Tuesday
Sunny, with a high near 88.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
2 Miles SE Old Lyme CT
 41.28°N 72.3°W (Elev. 0 ft)
Last Update:
3:06 am EDT Jun 18, 2025
Forecast Valid:
5am EDT Jun 18, 2025-6pm EDT Jun 24, 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