September weather forecastChattanooga, OK
September
Weather in September
September, the first month of the autumn in Chattanooga, is still a hot month, with an average temperature varying between 67.3°F (19.6°C) and 86.4°F (30.2°C).Temperature
Chattanooga's September weather comes with a decrease in average high-temperatures, moving from a sweltering 95.5°F (35.3°C) in August to a hot 86.4°F (30.2°C). An average temperature of 67.3°F (19.6°C) is recorded during the nights in September.Heat index
In September, the heat index is evaluated at a tropical 91.4°F (33°C). Ensure additional precautions, heat exhaustion and heat cramps may be expected. Heatstroke could occur from sustained activity.For clarity, heat index numbers account for light winds and areas under shade. Under direct sunshine, the heat index values might be elevated by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'felt air temperature' or 'feels like', is a fusion of air temperature and moisture levels to demonstrate the sensation of heat. One's weather perception can be influenced by a range of factors including metabolic differences, being pregnant, and their level of physical activity. It is important to note that direct sunlight can intensify the weather impact, potentially raising the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are essentially critical for children. Children commonly overlook the importance of rest and fluid replenishment. Thirst, being a delayed sign of dehydration, emphasizes the need to keep hydration up, especially during lengthy physical activities.
Humidity
In Chattanooga, the average relative humidity in September is 61%.Rainfall
In Chattanooga, in September, it is raining for 12.8 days, with typically 2.36" (60mm) of accumulated precipitation. In Chattanooga, during the entire year, the rain falls for 109.7 days and collects up to 22.4" (569mm) of precipitation.Snowfall
In Chattanooga, snow does not fall in May through October.Daylight
In September, the average length of the day is 12h and 23min.On the first day of the month, sunrise is at 7:08 am and sunset at 8:00 pm. On the last day of September, sunrise is at 7:29 am and sunset at 7:19 pm CDT.
Sunshine
In Chattanooga, the average sunshine in September is 8.7h.UV index
The average daily maximum UV index in September is 6. A UV Index estimate of 6 to 7 represents a high health risk from unprotected exposure to Sun's UV rays for the average person.Note: The UV index of 6 during September translates into the following guidance:
Take precautions and utilize sun safety practices. Protection against skin and eye damage is required. Between 10 a.m. and 4 p.m., UV radiation is strongest. Make an effort to avoid direct sunlight during this time, remembering that shade structures may not provide full sun protection. In the presence of strong sunlight, it's crucial to wear sunglasses that ward off UVA and UVB rays.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Chattanooga, OK
- Average high temperature in September: 86.4°F
The warmest month (with the highest average high temperature) is July (95.9°F).
The month with the lowest average high temperature is December (51.3°F).
- Average low temperature in September: 67.3°F
The month with the highest average low temperature is July (74.8°F).
The coldest month (with the lowest average low temperature) is January (33.4°F).
Average pressure in September
Chattanooga, OK
- Average pressure in September: 29.97"Hg
The month with the highest atmospheric pressure is January (30.16"Hg).
The month with the lowest atmospheric pressure is June (29.87"Hg).
Average wind speed in September
Chattanooga, OK
- Average wind speed in September: 8.7mph
The windiest month (with the highest average wind speed) is April (12mph).
The calmest month (with the lowest average wind speed) is August (8.5mph).
Average humidity in September
Chattanooga, OK
- Average humidity in September: 61%
The month with the highest relative humidity is May (67%).
The month with the lowest relative humidity is August (52%).
Average rainfall in September
Chattanooga, OK
- Average rainfall in September: 2.36"
The wettest month (with the highest rainfall) is May (3.78").
The driest month (with the least rainfall) is February (0.83").
Average rainfall days in September
Chattanooga, OK
- Average rainfall days in September: 12.8 days
The month with the highest number of rainy days is May (13.9 days).
The month with the least rainy days is January (4.3 days).
Average snowfall in September
Chattanooga, OK
- Average snowfall in September: 0"
The month with the highest snowfall is January (0.91").
The months with the least snowfall are May, June, July, August, September and October (0").
Average snowfall days in September
Chattanooga, OK
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is February (2.3 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
Chattanooga, OK
- Average daylight in September: 12h and 24min
The month with the longest days is June (Average daylight: 14h and 24min).
The month with the shortest days is December (Average daylight: 9h and 54min).
- Average sunshine in September: 8h and 42min
The months with the most sunshine are June and July (Average sunshine: 11h and 18min).
The month with the least sunshine is December (Average sunshine: 6h and 18min).
Average sunshine days in September
Chattanooga, OK
- Average sunshine days in September: 15.3 days
The month with the most sunshine days is January (25.2 days).
The month with the least sunshine days is May (14.5 days).
Average UV index in September
Chattanooga, OK
- Average UV index in September: 6
The months with the highest UV index are June, July and August (UV index 7).
The month with the lowest UV index is December (UV index 2).
Average cloud cover in September
Chattanooga, OK
- Average cloud cover in September: 26
The month with the most cloud cover is March (Cloud cover 32).
The month with the least cloud cover is August (Cloud cover 17).
Average visibility in September
Chattanooga, OK
- Average visibility in September: 6mi
The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
