September weather forecast
Mammoth Cave National Park, KY

The first month of the autumn, September, is also a moderately hot month in Mammoth Cave National Park, Kentucky, with an average temperature varying between 80.6°F (27°C) and 57.2°F (14°C).

Temperature

In September, the average high-temperature slightly decreases from a hot 86°F (30°C) in August to a moderately hot 80.6°F (27°C). In September, in Mammoth Cave National Park, Kentucky, the average low-temperature is 57.2°F (14°C).

Rainfall

In September, in Mammoth Cave National Park, the rain falls for 8 days. Throughout September, 3.74" (95mm) of precipitation is accumulated. Throughout the year, there are 126 rainfall days, and 50.63" (1286mm) of precipitation is accumulated.

Daylight

In Mammoth Cave National Park, the average length of the day in September is 12h and 25min.
On the first day of the month, sunrise is at 6:15 am and sunset at 7:13 pm. On the last day of September, sunrise is at 6:38 am and sunset at 6:29 pm CDT.

Sunshine

In Mammoth Cave National Park, the average sunshine in September is 8h.

UV index

In Mammoth Cave National Park, the average daily maximum UV index in September is 7. A UV Index reading of 6 to 7 represents a high health vulnerability from exposure to the Sun's UV rays for ordinary individuals.
Note: The average daily UV index of 7 in September transform into the following instructions:
Take precautions against overexposure. Fair-skinned people may get burned in less than 20 minutes. The Sun's UV radiation is most powerful between 10 a.m. and 4 p.m. To the extent possible, limit exposure to the direct sun during these hours. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects.