Click on a day for an hourly weather forecast
The temperatures in Chattanooga in September are comfortable with low of 16°C and and high up to 28°C.
You can expect about 3 to 8 days of rain in Chattanooga during the month of September. It’s a good idea to bring along your umbrella so that you don’t get caught in poor weather.
Our weather forecast can give you a great sense of what weather to expect in Chattanooga in September 2025.
If you’re planning to visit Chattanooga in the near future, we highly recommend that you review the 14 day weather forecast for Chattanooga before you arrive.
| Month | Temperatures | Rainy Days | Dry Days | Snowy Days | Rainfall | Weather | More details |
|---|---|---|---|---|---|---|---|
| January | 8° / 0° | 7 | 20 | 4 | 168 mm | Awful | Chattanooga in January |
| February | 11° / 2° | 9 | 15 | 4 | 180 mm | Awful | Chattanooga in February |
| March | 16° / 6° | 10 | 20 | 1 | 186 mm | Ok | Chattanooga in March |
| April | 21° / 9° | 8 | 22 | 0 | 185 mm | Ok | Chattanooga in April |
| May | 26° / 14° | 8 | 23 | 0 | 164 mm | Good | Chattanooga in May |
| June | 30° / 18° | 10 | 20 | 0 | 163 mm | Ok | Chattanooga in June |
| July | 32° / 19° | 10 | 21 | 0 | 208 mm | Ok | Chattanooga in July |
| August | 31° / 19° | 8 | 23 | 0 | 159 mm | Ok | Chattanooga in August |
| September | 28° / 16° | 5 | 25 | 0 | 160 mm | Perfect | Chattanooga in September |
| October | 22° / 10° | 5 | 26 | 0 | 140 mm | Good | Chattanooga in October |
| November | 15° / 5° | 6 | 24 | 1 | 137 mm | Good | Chattanooga in November |
| December | 11° / 3° | 8 | 21 | 2 | 187 mm | Awful | Chattanooga in December |