Average Weather in September in Sparta Tennessee, United States
Daily high temperatures decrease by 9°F, from 86°F to 76°F, rarely falling below 66°F or exceeding 93°F.
Daily low temperatures decrease by 11°F, from 63°F to 52°F, rarely falling below 40°F or exceeding 69°F.
For reference, on July 21, the hottest day of the year, temperatures in Sparta typically range from 67°F to 89°F, while on January 23, the coldest day of the year, they range from 30°F to 48°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 Sparta 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 21.
The clearest day of the month is September 21, 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 59%, while on September 21, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 67%.
Cloud Cover Categories in September
0% clear 20% mostly clear 40% partly cloudy 60% mostly cloudy 80% overcast 100%
A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. In Sparta, the chance of a wet day over the course of September is gradually decreasing, starting the month at 29% and ending it at 25%.
For reference, the year's highest daily chance of a wet day is 45% on July 9, and its lowest chance is 22% on October 18.
Probability of Precipitation in September
The average sliding 31-day rainfall during September in Sparta is essentially constant, remaining about 3.1 inches throughout, and rarely exceeding 6.2 inches or falling below 1.1 inches.
The highest average 31-day accumulation is 3.3 inches on September 23.
Average Monthly Rainfall in September
Over the course of September in Sparta, 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, 5 minutes, implying an average daily decrease of 2 minutes, 14 seconds, and weekly decrease of 15 minutes, 38 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, 56 minutes of daylight.
Hours of Daylight and Twilight in September
The earliest sunrise of the month in Sparta is 6:13 AM on September 1 and the latest sunrise is 22 minutes later at 6:36 AM on September 30.
The latest sunset is 7:09 PM on September 1 and the earliest sunset is 42 minutes earlier at 6:26 PM on September 30.
Daylight saving time is observed in Sparta during 2018, 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 5:25 AM and sets 14 hours, 36 minutes later, at 8:01 PM, while on December 21, the shortest day of the year, it rises at 6:48 AM and sets 9 hours, 43 minutes later, at 4:31 PM.
Sunrise & Sunset with Twilight in September
The chance that a given day will be muggy in Sparta is very rapidly decreasing during September, falling from 61% to 17% 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
dry 55°F comfortable 60°F humid 65°F muggy 70°F oppressive 75°F miserable
The average hourly wind speed in Sparta is gradually increasing during September, increasing from 3.5 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 6.1 miles per hour, while on July 31, the calmest day of the year, the daily average wind speed is 3.3 miles per hour.
Average Wind Speed in September
Wind Direction in September
The growing season in Sparta typically lasts for 6.5 months (198 days), from around April 6 to around October 22, rarely starting before March 17 or after April 26, and rarely ending before October 4 or after November 10.
The month of September in Sparta is very likely fully within the growing season, with the chance that a given day is in the growing season gradually decreasing from 100% to 94% over the course of the month.
Time Spent in Various Temperature Bands and the Growing Season in September
The average accumulated growing degree days in Sparta are rapidly increasing during September, increasing by 538°F, from 3,353°F to 3,892°F, over the course of the month.
Growing Degree Days in September
The average daily incident shortwave solar energy in Sparta 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 Sparta are 35.926 deg latitude, -85.464 deg longitude, and 958 ft elevation.
The topography within 2 miles of Sparta contains significant variations in elevation, with a maximum elevation change of 502 feet and an average elevation above sea level of 964 feet. Within 10 miles contains significant variations in elevation (1,358 feet). Within 50 miles contains very significant variations in elevation (2,595 feet).
The area within 2 miles of Sparta is covered by cropland (55%), trees (23%), and artificial surfaces (22%), within 10 miles by cropland (53%) and trees (46%), and within 50 miles by trees (67%) and cropland (30%).
This report illustrates the typical weather in Sparta 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 Sparta.
For each station, the records are corrected for the elevation difference between that station and Sparta 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 Sparta is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between Sparta and a given station.
The stations contributing to this reconstruction are: Upper Cumberland Regional Airport (74%, 16 kilometers, northwest); Crossville Memorial Airport (16%, 35 kilometers, east); Tullahoma Regional Airport/William Northern Field (5%, 93 kilometers, southwest); and Lovell Field (4.5%, 102 kilometers, south).
Time zones for aiports and weather stations are provided by AskGeo.com .