Weather in Chattanooga in September 2025
- September is usually the wettest month of the year in Chattanooga;
Average weather
Average temperature in Chattanooga in September
The expected average maximum temperature in September is +29°C with a maximum of +32°C and a minimum of +13°C.
The average maximum temperature goes up 0% by the end of the month, compared with the beginning of the month, from +30°C to +30°C.
Is Chattanooga warm or cold in September?
Chattanooga is typically warm in September.
Maximum temperatures go down compared to the previous month from +31°C to +28°C. The minimum temperature also goes down from +21°C to +17°C.
It’s generally warm, but pack a long-sleeve shirt for evenings.
Take a look at how September is compared to other months in Chattanooga:
Climate in Chattanooga in September
| August | September | October | ||||
|---|---|---|---|---|---|---|
| Avg. temperature | ||||||
| +31°C | +28°C | +22°C | ||||
| Min. temperature | ||||||
| +13°C | +5°C | -2°C | ||||
| Max. temperature | ||||||
| +39°C | +36°C | +36°C | ||||
| Rainfall | ||||||
| 98 mm | 95 mm | 78 mm | ||||
| Wind | ||||||
| 1 m/s | 1 m/s | 1 m/s | ||||
| Humidity | ||||||
| 73% | 73% | 72% | ||||
| Air pressure | ||||||
| 1016 HPa | 1017 HPa | 1018 HPa | ||||
| Sunny days | ||||||
| 6 | 8 | 11 | ||||
| Cloudy days | ||||||
| 6 | 7 | 9 | ||||
| Rainy days | ||||||
| 12 | 10 | 10 | ||||
| Snowy days | ||||||
| 0 | 0 | 0 | ||||
September weather is still as good as in August. It’s getting colder in September. From +31°C in the day, the average maximum temperature lowers to +28°C. As September arrives, the amount of rainfall goes down. On average, the rainfall volume decreases from 98 mm to 95 mm. Humidity levels don’t change as the month goes on, averaging around 73%. The average wind speed doesn’t change much during September, staying around 1 m/s. The good news is there are likely to be more sunny days in September, from 6 to 8.
October brings much the same weather, it remains good.
Wind
The average wind speed is 1 m/s getting up to 2 m/s which is a light breeze; barely moving the tree leaves.
The average wind speed in Chattanooga is gradually increasing during September, going from 1 m/s to 1 m/s over the course of the month.
Rain
How was the weather last September in Chattanooga?
Climate Change over Years
The climate in Chattanooga in September has not changed much over the last 43 years.
The average temperature was the lowest in 1979 (+20°C) and the highest in 2016 (+24°C). The driest year was 2007 with only 654 mm of rainfall, and the wettest year was 2019 with 2402 mm.
FAQ
Is September a good time to visit Chattanooga?
Can you sunbathe in Chattanooga in September?
Is Chattanooga rainy in September?
Is it sunny in Chattanooga in September?
Other cities in USA
Monthly weather in Chattanooga
Source of the data
For this page, we’ve looked at the typical weather in Chattanooga, based on historical hourly weather data from January 1, 1979, to December 31, 2023.
For past dates, we show actual recorded data at the location at that time. Forecasts are based on recorded weather during that day of the year, averaged over the total years for which we have records (unless stated otherwise). The daily temperature is the highest recorded temperature in the shadow during that day.