September weather forecastGreat Smoky Mountains National Park, TN
September
Weather in September
The arrival of September in Great Smoky Mountains National Park sets the stage for a mild beginning of the fall season. The park starts its transformation into a sea of golds, oranges, and deep reds, offering a kaleidoscope of autumn colors. The rapid change in fauna, backed by natural beauty, piques visitor interest despite the diminishing daylight hours. September continues the trend of no snowfall left from the summer. Remember to pack for mix weather conditions that come with the onset of autumn.Temperature
September's onset sees an average high-temperature of a comfortable 64.9°F (18.3°C), exhibiting a slight fluctuation from the previous month. During September, Great Smoky Mountains National Park sees a mean low-temperature of 50°F (10°C).Rainfall
In Great Smoky Mountains National Park, in September, it is raining for 8 days, with typically 5.87" (149mm) of accumulated precipitation. In Great Smoky Mountains National Park, during the entire year, the rain falls for 123 days and collects up to 72.13" (1832mm) of precipitation.Snowfall
In Great Smoky Mountains National Park, snow does not fall in June through September.Daylight
In September, the average length of the day is 12h and 23min.On the first day of September, sunrise is at 7:06 am and sunset at 8:00 pm. On the last day of the month, sunrise is at 7:28 am and sunset at 7:18 pm EDT.
Sunshine
The average sunshine in September is 7h.UV index
The average daily maximum UV index in September is 8. A UV Index reading of 8 to 10 represents a very high health vulnerability from exposure to the Sun's UV rays for ordinary individuals.Note: The maximum daily UV index, 8 in September, converts into the following recommendations:
Always be cautious. Skin and eyes can be affected swiftly without protection. It's important to stay in the shade and limit exposure to the sun from 10 a.m. to 4 p.m., when UV radiation is most intense, although remember that shade structures may not provide full sun protection. Loose clothes with a tight weave are optimal for safeguarding yourself against the Sun's rays.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Great Smoky Mountains National Park, TN
- Average high temperature in September: 65°F
The warmest month (with the highest average high temperature) is July (71°F).
The month with the lowest average high temperature is January (37°F).
- Average low temperature in September: 50°F
The months with the highest average low temperature are July and August (55°F).
The coldest month (with the lowest average low temperature) is January (20°F).
Average rainfall in September
Great Smoky Mountains National Park, TN
- Average rainfall in September: 5.8"
The wettest month (with the highest rainfall) is July (7.6").
The driest month (with the least rainfall) is October (4.3").
Average rainfall days in September
Great Smoky Mountains National Park, TN
- Average rainfall days in September: 8 days
The month with the highest number of rainy days is July (14 days).
The months with the least rainy days are September, October and November (8 days).
Average snowfall in September
Great Smoky Mountains National Park, TN
- Average snowfall in September: 0"
The month with the highest snowfall is February (18.1").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in September
Great Smoky Mountains National Park, TN
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (7 days).
The months with the least snowfall days are May, June, July, August, September and October (0 days).
Average daylight in September /
Average sunshine in September
Great Smoky Mountains National Park, TN
- Average daylight in September: 12h and 24min
The month with the longest days is June (Average daylight: 14h and 30min).
The month with the shortest days is December (Average daylight: 9h and 48min).
- Average sunshine in September: 7h
The months with the most sunshine are May, June and July (Average sunshine: 9h).
The month with the least sunshine is December (Average sunshine: 4h).
Average UV index in September
Great Smoky Mountains National Park, TN
- Average UV index in September: 8
The months with the highest UV index are June and July (UV index 10).
The month with the lowest UV index is December (UV index 2).
