Average Weather in September in East Chattanooga Tennessee, United States
In East Chattanooga, the month of September is characterized by falling daily high temperatures, with daily highs decreasing by 9°F, from 87°F to 78°F over the course of the month, and rarely exceeding 93°F or dropping below 69°F.
Daily low temperatures decrease by 10°F, from 68°F to 58°F, rarely falling below 47°F or exceeding 73°F.
For reference, on July 21, the hottest day of the year, temperatures in East Chattanooga typically range from 71°F to 89°F, while on January 26, the coldest day of the year, they range from 32°F to 50°F.
Average High and Low Temperature in September
The figure below shows you a compact characterization of the hourly average temperatures for the quarter of the year centered on September. The horizontal axis is the day, the vertical axis is the hour of the day, and the color is the average temperature for that hour and day.
Average Hourly Temperature in September
The month of September in East Chattanooga experiences essentially constant cloud cover, with the percentage of time that the sky is overcast or mostly cloudy remaining about 35% throughout the month. The lowest chance of overcast or mostly cloudy conditions is 33% on September 20.
The clearest day of the month is September 20, with clear, mostly clear, or partly cloudy conditions 67% of the time.
For reference, on January 3, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 56%, while on September 20, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 67%.
Cloud Cover Categories in September
A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. In East Chattanooga, the chance of a wet day over the course of September is rapidly decreasing, starting the month at 29% and ending it at 23%.
For reference, the year's highest daily chance of a wet day is 43% on July 9, and its lowest chance is 20% on October 16.
Probability of Precipitation in September
The average sliding 31-day rainfall during September in East Chattanooga is gradually increasing, starting the month at 3.0 inches, when it rarely exceeds 5.5 inches or falls below 1.1 inches, and ending the month at 3.4 inches, when it rarely exceeds 6.6 inches or falls below 1.0 inches.
The highest average 31-day accumulation is 3.5 inches on September 22.
Average Monthly Rainfall in September
Over the course of September in East Chattanooga, the length of the day is rapidly decreasing. From the start to the end of the month, the length of the day decreases by 1 hour, 3 minutes, implying an average daily decrease of 2 minutes, 10 seconds, and weekly decrease of 15 minutes, 10 seconds.
The shortest day of the month is September 30, with 11 hours, 51 minutes of daylight and the longest day is September 1, with 12 hours, 54 minutes of daylight.
Hours of Daylight and Twilight in September
The earliest sunrise of the month in East Chattanooga is 7:13 AM on September 1 and the latest sunrise is 21 minutes later at 7:35 AM on September 30.
The latest sunset is 8:07 PM on September 1 and the earliest sunset is 41 minutes earlier at 7:25 PM on September 30.
Daylight saving time is observed in East Chattanooga during 2017, but it neither starts nor ends during September, so the entire month is in daylight saving time.
For reference, on June 21, the longest day of the year, the Sun rises at 6:27 AM and sets 14 hours, 31 minutes later, at 8:58 PM, while on December 21, the shortest day of the year, it rises at 7:45 AM and sets 9 hours, 48 minutes later, at 5:33 PM.
Sunrise & Sunset with Twilight in September
The chance that a given day will be muggy in East Chattanooga is very rapidly decreasing during September, falling from 62% to 18% over the course of the month.
For reference, on July 24, the muggiest day of the year, there are muggy conditions 85% of the time, while on January 23, the least muggy day of the year, there are muggy conditions 0% of the time.
Humidity Comfort Levels in September
The average hourly wind speed in East Chattanooga is gradually increasing during September, increasing from 3.4 miles per hour to 4.1 miles per hour over the course of the month.
For reference, on February 25, the windiest day of the year, the daily average wind speed is 5.6 miles per hour, while on August 1, the calmest day of the year, the daily average wind speed is 3.2 miles per hour.
Average Wind Speed in September
Wind Direction in September
The growing season in East Chattanooga typically lasts for 7.5 months (228 days), from around March 26 to around November 9, rarely starting before March 5 or after April 15, and rarely ending before October 22 or after November 28.
The month of September in East Chattanooga is reliably fully within the growing season.
Time Spent in Various Temperature Bands and the Growing Season in September
The average accumulated growing degree days in East Chattanooga is rapidly increasing during September, increasing by 630°F, from 3,704°F to 4,334°F, over the course of the month.
Growing Degree Days in September
The average daily incident shortwave solar energy in East Chattanooga is gradually decreasing during September, falling by 0.9 kWh, from 5.8 kWh to 4.9 kWh, over the course of the month.
Average Daily Incident Shortwave Solar Energy in September
For the purposes of this report, the geographical coordinates of East Chattanooga are 35.065 deg latitude, -85.249 deg longitude, and 682 ft elevation.
The topography within 2 miles of East Chattanooga contains only modest variations in elevation, with a maximum elevation change of 449 feet and an average elevation above sea level of 725 feet. Within 10 miles contains only modest variations in elevation (1,637 feet). Within 50 miles contains very significant variations in elevation (3,724 feet).
The area within 2 miles of East Chattanooga is covered by artificial surfaces (68%) and trees (31%), within 10 miles by trees (47%) and artificial surfaces (39%), and within 50 miles by trees (68%) and cropland (26%).
This report illustrates the typical weather in East Chattanooga year round, based on a statistical analysis of historical hourly weather reports and model reconstructions from January 1, 1980 to December 31, 2016.
Temperature and Dew Point
There are 4 weather stations near enough to contribute to our estimation of the temperature and dew point in East Chattanooga.
For each station, the records are corrected for the elevation difference between that station and East Chattanooga according to the International Standard Atmosphere , and by the relative change present in the MERRA-2 satellite-era reanalysis between the two locations.
The estimated value at East Chattanooga is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between East Chattanooga and a given station.
The stations contributing to this reconstruction are: Lovell Field (95%, 5.8 kilometers, southeast); Winchester Municipal Airport (2.0%, 75 kilometers, west); Scottsboro Municipal Airport Word Field (1.8%, 81 kilometers, southwest); and Crossville Memorial Airport (1.2%, 100 kilometers, north).
Time zones for aiports and weather stations are provided by AskGeo.com .