September weather forecast and climate
Chattanooga, TN

A stunning aerial panorama of the area of Chattanooga in Tennessee, USA, a distant white skyline in the horizon and mountains in view
A stunning aerial panorama of the area of Chattanooga in Tennessee, USA, a distant white skyline in the horizon and mountains in view
Average temperature in September - Chattanooga, TN
  • Average high temperature in September: 28.4°C

The warmest month (with the highest average high temperature) is July (32.3°C).
The month with the lowest average high temperature is January (10.1°C).

  • Average low temperature in September: 16.6°C

The month with the highest average low temperature is July (20.9°C).
The coldest month (with the lowest average low temperature) is January (-0.7°C).

Average humidity in September - Chattanooga, TN
  • Average humidity in September: 77%

The month with the highest relative humidity is September (77%).
The month with the lowest relative humidity is April (63.8%).

Average rainfall in September - Chattanooga, TN
  • Average rainfall in September: 102.6mm

The wettest month (with the highest rainfall) is November (127mm).
The driest month (with the lowest rainfall) is October (83.3mm).

Average rainfall days in September - Chattanooga, TN
  • Average rainfall days in September: 8 days

The month with the highest number of rainy days is July (11.7 days).
The month with the lowest number of rainy days is October (7.7 days).

Average snowfall in September - Chattanooga, TN
  • Average snowfall in September: 0mm

The month with the highest snowfall is January (43.2mm).
Months with the lowest snowfall are May, June, July, August, September, October and November (0mm).

Average snowfall days in September - Chattanooga, TN
  • Average snowfall days in September: 0 days

The month with the highest number of snowfall days is January (1 days).
Months with the lowest number of snowfall days are April, May, June, July, August, September and October (0 days).

Average daylight in September / Average sunshine in September - Chattanooga, TN
  • Average daylight in September: 12.4h

The month with the longest days is June (Average daylight: 14.5h).
The month with shortest days is December (Average daylight: 9.8h).

  • Average sunshine in September: 7.6h

The month with most sunshine is June (Average sunshine: 9.2h).
The month with least sunshine is December (Average sunshine: 4.5h).

Average UV index in September - Chattanooga, TN
  • Average UV index in September: 8

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).

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