Great Smoky Mountains National Park Weather in September
September in Great Smoky Mountains National Park brings high temperatures around 22°C (72°F) during the day, dropping to 10°C (50°F) at night, with quite a bit of rainfall expected, averaging around 136 mm (5.4 in) for the month.
Rainfall in Great Smoky Mountains National Park in September
Rain is expected on roughly 13 days, totalling around 136 mm (5.4 in) for the month. When it rains this month, it tends to come down fairly heavily. Showers can be substantial even if they don't last all day.
Temperature in Great Smoky Mountains National Park in September
Expect highs of 22°C (72°F) in Great Smoky Mountains National Park in September, with nights dropping to around 10°C (50°F). The days can feel warmer than the evenings, so packing for both parts of the day is a good idea. At 10°C (50°F) overnight, it can feel quite a bit cooler after dark. Worth packing something warmer for evenings, but the cooler temperatures are ideal for sleeping.
Sunshine in Great Smoky Mountains National Park in September
The city usually sees around 233 hours of sunlight, indicating many sunny days — a great month for sightseeing.If your ideal day consists of dry skies and pleasant temperatures, May, June, August and September typically offer the best circumstances for Great Smoky Mountains National Park.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit the United States of America, check out our Great Smoky Mountains National Park's climate page.
Great Smoky Mountains National Park Temperature in September
Min Temperature
10°C (50°F)
Max Temperature
22°C (72°F)
Chance of Rain
43%
Precipitation
136 mm (5.4 in)
Rainy days
13 days
Humidity
76% *
Sunshine
233 hours *
Percentage Sunshine
62% *
Daily Historical Temperatures
50-year average (1976-2025)
Based on our historical records, temperatures in Great Smoky Mountains National Park typically drop from around 29°C (84°F) at the start of September to approximately 25°C (77°F) by the end. Nights are pleasant, with lows typically ranging from 13°C (55°F) to 19°C (66°F).
Average temperatures in September
Daily Historical Precipitation
50-year average (1976-2025)
Average daily rainfall for each day of the month based on long-term records.
Average precipitation in September
Historical weather for Great Smoky Mountains National Park in September
Browse day-by-day weather records for Great Smoky Mountains National Park spanning 51 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.
Great Smoky Mountains National Park historical weather extremes in September
According to our 49 years of weather records for Great Smoky Mountains National Park, the following extremes were recorded between 1976 and 2025.
- The hottest September day on record in Great Smoky Mountains National Park reached 35°C (95°F) (September 5, 1998).
- The coldest September day was on September 23, 1995, with a maximum of 12°C (54°F).
- Nighttime temperatures dropped to 3°C (37°F) on September 28, 2022, marking the coldest September night on record.
- The wettest September day on record brought 93 mm (3.7 in) of precipitation to Great Smoky Mountains National Park (September 15, 1989).
Best Places in the United States of America in September
Find out more about the weather in the United States of America and which places have the best travel conditions in this month. See all of the United States of America in September →
perfect weather
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What to Wear in Great Smoky Mountains National Park in September
Pleasant temperatures in September mean you can pack light but flexibel pieces. Think cotton t-shirts, comfortable walking shorts, and one warmer layer for evenings. A light sweater or denim jacket works well. Prepare for significant rainfall with proper waterproof clothing and shoes. Don't forget sun protection, sunglasses, sunscreen, and a hat. These are all good ideas with this much sunshine.What To Do in Great Smoky Mountains National Park in September
We rated the following activities from 1 (least suitable) to 10 (best) to do.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit the United States of America, check out our Great Smoky Mountains National Park's climate page.
