Average Weather in September in Seymour Indiana, United States
In Seymour, the month of September is characterized by rapidly falling daily high temperatures, with daily highs decreasing by 10°F, from 83°F to 73°F over the course of the month, and rarely exceeding 90°F or dropping below 62°F.
Daily low temperatures decrease by 11°F, from 64°F to 53°F, rarely falling below 41°F or exceeding 72°F.
For reference, on July 20, the hottest day of the year, temperatures in Seymour typically range from 68°F to 86°F, while on January 29, the coldest day of the year, they range from 25°F to 39°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 Seymour experiences essentially constant cloud cover, with the percentage of time that the sky is overcast or mostly cloudy remaining about 33% throughout the month.
The clearest day of the month is September 1, with clear, mostly clear, or partly cloudy conditions 68% of the time.
For reference, on December 25, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 59%, while on August 23, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 69%.
Cloud Cover in September
A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. In Seymour, the chance of a wet day over the course of September is gradually decreasing, starting the month at 26% and ending it at 24%.
For reference, the year's highest daily chance of a wet day is 41% on May 21, and its lowest chance is 21% on January 29.
Probability of Precipitation in September
The average sliding 31-day rainfall during September in Seymour is essentially constant, remaining about 2.9 inches throughout, and rarely exceeding 5.6 inches or falling below 0.7 inches.
The lowest average 31-day accumulation is 2.8 inches on September 6.
Average Monthly Rainfall in September
Over the course of September in Seymour, 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, 12 minutes, implying an average daily decrease of 2 minutes, 30 seconds, and weekly decrease of 17 minutes, 27 seconds.
The shortest day of the month is September 30, with 11 hours, 49 minutes of daylight and the longest day is September 1, with 13 hours, 1 minute of daylight.
Hours of Daylight and Twilight in September
The earliest sunrise of the month in Seymour is 7:12 AM on September 1 and the latest sunrise is 26 minutes later at 7:38 AM on September 30.
The latest sunset is 8:13 PM on September 1 and the earliest sunset is 46 minutes earlier at 7:27 PM on September 30.
Daylight saving time is observed in Seymour 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 6:18 AM and sets 14 hours, 54 minutes later, at 9:12 PM, while on December 21, the shortest day of the year, it rises at 7:58 AM and sets 9 hours, 26 minutes later, at 5:24 PM.
Sunrise & Sunset with Twilight in September
The chance that a given day will be muggy in Seymour is very rapidly decreasing during September, falling from 42% to 9% over the course of the month.
For reference, on July 27, the muggiest day of the year, there are muggy conditions 63% of the time, while on November 30, 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 Seymour is gradually increasing during September, increasing from 3.0 miles per hour to 3.6 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 5.0 miles per hour, while on August 1, the calmest day of the year, the daily average wind speed is 2.8 miles per hour.
Average Wind Speed in September
Wind Direction in September
The average daily incident shortwave solar energy in Seymour is decreasing during September, falling by 1.1 kWh, from 5.8 kWh to 4.6 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 Seymour are 38.959 deg latitude, -85.890 deg longitude, and 577 ft elevation.
The topography within 2 miles of Seymour is essentially flat, with a maximum elevation change of 79 feet and an average elevation above sea level of 583 feet. Within 10 miles is essentially flat (446 feet). Within 50 miles contains only modest variations in elevation (715 feet).
The area within 2 miles of Seymour is covered by cropland (54%) and artificial surfaces (46%), within 10 miles by cropland (77%) and trees (20%), and within 50 miles by cropland (49%) and trees (46%).
This report illustrates the typical weather in Seymour 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 5 weather stations near enough to contribute to our estimation of the temperature and dew point in Seymour.
For each station, the records are corrected for the elevation difference between that station and Seymour 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 Seymour is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between Seymour and a given station.
The stations contributing to this reconstruction are: Monroe County Airport (28%, 66 kilometers, west); Shelbyville Municipal Airport (26%, 69 kilometers, north); Bowman Field (20%, 84 kilometers, south); Cincinnati/Northern Kentucky International Airport (14%, 106 kilometers, east); and Huntingburg Airport (11%, 122 kilometers, southwest).
Time zones for aiports and weather stations are provided by AskGeo.com .