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

Dangerous Heat in the Central and Eastern U.S.; Critical Fire Weather in the Great Basin and Southwest

Dangerous, record-breaking heat will intensify across most of the central and eastern U.S this week. Heat indices will likely exceed 100 degrees. Heat is likely to continue across the eastern U.S. through the Independence Day holiday weekend. Critical fire weather conditions will continue Tuesday across portions of the Four Corners and Great Basin, as dry conditions and gusty winds persist. Read More >

Hazardous Weather Conditions

Current conditions at

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

Lat: 41.33°NLon: 72.05°WElev: 10ft.

Fair

67°F

19°C

Humidity 97%
Wind Speed E 3 mph
Barometer 30.12 in (1020.1 mb)
Dewpoint 66°F (19°C)
Visibility 10.00 mi
Last update 30 Jun 12:56 am EDT
Extended Forecast for

2 Miles E South Lyme CT

Extreme Heat Watch July 1, 12:00pm until July 4, 09:00pm
Click here for hazard details and duration
Extreme Heat Watch

  • Overnight

    Overnight: Patchy fog. Otherwise, partly cloudy, with a low around 63. Calm wind.

    Low: 63 °F

    Patchy Fog

  • Tuesday

    Tuesday: Mostly sunny, with a high near 85. South wind 5 to 10 mph, with gusts as high as 21 mph.

    High: 85 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: A 30 percent chance of showers and thunderstorms, mainly after 2am. Partly cloudy, with a low around 68. Southwest wind 7 to 13 mph.

    Low: 68 °F

    Chance
    T-storms

  • Wednesday

    Wednesday: A 30 percent chance of showers and thunderstorms before 8am. Mostly sunny, with a high near 89. Southwest wind 8 to 13 mph.

    High: 89 °F

    Chance
    T-storms then
    Mostly Sunny

  • Wednesday Night

    Wednesday Night: A 20 percent chance of showers and thunderstorms before 2am. Partly cloudy, with a low around 71. Southwest wind 3 to 7 mph.

    Low: 71 °F

    Slight Chance
    T-storms

  • Thursday

    Thursday: Sunny, with a high near 97.

    High: 97 °F

    Sunny

  • Thursday Night

    Thursday Night: Clear, with a low around 73.

    Low: 73 °F

    Clear

  • Friday

    Friday: A 30 percent chance of showers after 2pm. Sunny, with a high near 97.

    High: 97 °F

    Sunny then
    Chance
    Showers

  • Friday Night

    Friday Night: A 30 percent chance of showers before 8pm. Partly cloudy, with a low around 72.

    Low: 72 °F

    Chance
    Showers then
    Mostly Clear

Detailed Forecast

Overnight
Patchy fog. Otherwise, partly cloudy, with a low around 63. Calm wind.
Tuesday
Mostly sunny, with a high near 85. South wind 5 to 10 mph, with gusts as high as 21 mph.
Tuesday Night
A 30 percent chance of showers and thunderstorms, mainly after 2am. Partly cloudy, with a low around 68. Southwest wind 7 to 13 mph.
Wednesday
A 30 percent chance of showers and thunderstorms before 8am. Mostly sunny, with a high near 89. Southwest wind 8 to 13 mph.
Wednesday Night
A 20 percent chance of showers and thunderstorms before 2am. Partly cloudy, with a low around 71. Southwest wind 3 to 7 mph.
Thursday
Sunny, with a high near 97.
Thursday Night
Clear, with a low around 73.
Friday
A 30 percent chance of showers after 2pm. Sunny, with a high near 97.
Friday Night
A 30 percent chance of showers before 8pm. Partly cloudy, with a low around 72.
Independence Day
A 40 percent chance of showers after 2pm. Mostly sunny, with a high near 96.
Saturday Night
A 30 percent chance of showers. Partly cloudy, with a low around 70.
Sunday
Mostly sunny, with a high near 92.
Sunday Night
A 30 percent chance of showers. Partly cloudy, with a low around 68.
Monday
A 30 percent chance of showers. Mostly sunny, with a high near 89.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
2 Miles E South Lyme CT
 41.32°N 72.26°W (Elev. 98 ft)
Last Update:
3:53 pm EDT Jun 29, 2026
Forecast Valid:
1am EDT Jun 30, 2026-6pm EDT Jul 6, 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