NWS Forecast for Mammoth Cave KY

National Weather Service Forecast for: Mammoth Cave KY
Issued by: National Weather Service Louisville, KY

Updated: 1:26 am CDT Jun 30, 2026

Overnight Mostly Clear	Tuesday Hot	Tuesday Night Mostly Clear	Wednesday Hot	Wednesday Night Mostly Clear	Thursday Hot	Thursday Night Slight Chance T-storms	Friday Sunny then Chance T-storms	Friday Night Slight Chance T-storms
Lo 75 °F	Hi 94 °F	Lo 74 °F	Hi 95 °F	Lo 76 °F	Hi 96 °F	Lo 76 °F	Hi 94 °F	Lo 75 °F

Flood Warning
Extreme Heat Warning

Overnight	Mostly clear, with a low around 75. Calm wind.
Tuesday	Sunny and hot, with a high near 94. Heat index values as high as 106. Calm wind becoming west around 5 mph in the afternoon.
Tuesday Night	Mostly clear, with a low around 74. Calm wind.
Wednesday	Sunny and hot, with a high near 95. Heat index values as high as 105. Calm wind.
Wednesday Night	Mostly clear, with a low around 76. Calm wind.
Thursday	Sunny and hot, with a high near 96.
Thursday Night	A 20 percent chance of showers and thunderstorms before 1am. Mostly clear, with a low around 76.
Friday	A 40 percent chance of showers and thunderstorms after 1pm. Sunny and hot, with a high near 94.
Friday Night	A 20 percent chance of showers and thunderstorms before 1am. Partly cloudy, with a low around 75.
Independence Day	A 30 percent chance of showers and thunderstorms, mainly after 1pm. Mostly sunny, with a high near 91.
Saturday Night	A 30 percent chance of showers and thunderstorms. Partly cloudy, with a low around 75.
Sunday	A 50 percent chance of showers and thunderstorms. Mostly sunny, with a high near 90.
Sunday Night	A 30 percent chance of showers and thunderstorms. Partly cloudy, with a low around 74.
Monday	A 50 percent chance of showers and thunderstorms. Mostly sunny, with a high near 89.

Forecast from NOAA-NWS for Mammoth Cave KY.