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

Dangerous Heat and Heavy Rainfall into the Weekend

Hot temperatures and high humidity are forecast to continue across the mid-Mississippi Valley into this weekend. Heat Advisories remain in effect. Heavy to excessive rainfall occurring at times through the weekend could bring areas of flooding to parts of the northern Rockies, upper Midwest, central Great Lakes, and southern New England. Read More >

Hazardous Weather Conditions

Current conditions at

Glasgow, Glasgow Municipal Airport (KGLW)

Lat: 37.03°NLon: 85.95°WElev: 715ft.

Fair

82°F

28°C

Humidity 75%
Wind Speed Calm
Barometer 30.21 in
Dewpoint 73°F (23°C)
Visibility 10.00 mi
Heat Index88°F (31°C)
Last update 18 Sep 9:15 am CDT
Extended Forecast for

3 Miles E Mammoth Cave KY

Heat Advisory September 18, 09:33am until September 18, 07:00pm
Click here for hazard details and duration
Heat Advisory
  •  
    Heat Advisory September 18, 09:33am until September 18, 07:00pm

    NOW until 7:00pm Fri

    Heat Advisory

  • Today

    High: 95 °F

    Sunny then
    Slight Chance
    T-storms

  • Tonight

    Tonight: A 20 percent chance of showers and thunderstorms before 8pm. Patchy fog after 4am. Otherwise, partly cloudy, with a low around 69. Calm wind.

    Low: 69 °F

    Slight Chance
    T-storms then
    Patchy Fog

  • Saturday

    Saturday: Patchy fog before 7am. Otherwise, sunny, with a high near 93. Calm wind.

    High: 93 °F

    Patchy Fog
    then Sunny

  • Saturday Night

    Saturday Night: A 20 percent chance of showers after 1am. Partly cloudy, with a low around 70. Calm wind.

    Low: 70 °F

    Mostly Clear
    then Slight
    Chance
    Showers

  • Sunday

    Sunday: Mostly sunny, with a high near 93. Light south wind.

    High: 93 °F

    Mostly Sunny

  • Sunday Night

    Sunday Night: Partly cloudy, with a low around 69.

    Low: 69 °F

    Partly Cloudy

  • Monday

    Monday: A 30 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 91.

    High: 91 °F

    Mostly Sunny
    then Chance
    Showers

  • Monday Night

    Monday Night: A chance of showers and thunderstorms. Partly cloudy, with a low around 66. Chance of precipitation is 50%.

    Low: 66 °F

    Chance
    Showers

Detailed Forecast

Today
A 10 percent chance of showers and thunderstorms after 5pm. Sunny and hot, with a high near 95. Heat index values as high as 100. Calm wind.
Tonight
A 20 percent chance of showers and thunderstorms before 8pm. Patchy fog after 4am. Otherwise, partly cloudy, with a low around 69. Calm wind.
Saturday
Patchy fog before 7am. Otherwise, sunny, with a high near 93. Calm wind.
Saturday Night
A 20 percent chance of showers after 1am. Partly cloudy, with a low around 70. Calm wind.
Sunday
Mostly sunny, with a high near 93. Light south wind.
Sunday Night
Partly cloudy, with a low around 69.
Monday
A 30 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 91.
Monday Night
A chance of showers and thunderstorms. Partly cloudy, with a low around 66. Chance of precipitation is 50%.
Tuesday
A chance of showers, with thunderstorms also possible after 1pm. Partly sunny, with a high near 82. Chance of precipitation is 40%.
Tuesday Night
A 20 percent chance of showers before 1am. Partly cloudy, with a low around 61.
Wednesday
Partly sunny, with a high near 77.
Wednesday Night
Partly cloudy, with a low around 58.
Thursday
Partly sunny, with a high near 76.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
3 Miles E Mammoth Cave KY
 37.21°N 86.06°W (Elev. 702 ft)
Last Update:
7:36 am CDT Sep 18, 2026
Forecast Valid:
9am CDT Sep 18, 2026-6pm CDT Sep 24, 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