Average Weather in September in Mattawan Michigan, United States
In Mattawan, the month of September is characterized by rapidly falling daily high temperatures, with daily highs decreasing by 11°F, from 77°F to 67°F over the course of the month, and rarely exceeding 86°F or dropping below 55°F.
Daily low temperatures decrease by 10°F, from 59°F to 49°F, rarely falling below 38°F or exceeding 69°F.
For reference, on July 19, the hottest day of the year, temperatures in Mattawan typically range from 63°F to 82°F, while on January 29, the coldest day of the year, they range from 19°F to 31°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 Mattawan experiences gradually increasing cloud cover, with the percentage of time that the sky is overcast or mostly cloudy increasing from 32% to 37%.
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 29, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 68%, while on August 26, 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 Mattawan, the chance of a wet day over the course of September is essentially constant, remaining around 32% throughout.
For reference, the year's highest daily chance of a wet day is 36% on July 24, and its lowest chance is 17% on February 8.
Probability of Precipitation in September
To show variation within the month and not just the monthly total, we show the rainfall accumulated over a sliding 31-day period centered around each day.
The average sliding 31-day rainfall during September in Mattawan is essentially constant, remaining about 3.1 inches throughout, and rarely exceeding 5.2 inches or falling below 1.3 inches.
Average Monthly Rainfall in September
Over the course of September in Mattawan, 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, 21 minutes, implying an average daily decrease of 2 minutes, 48 seconds, and weekly decrease of 19 minutes, 36 seconds.
The shortest day of the month is September 30, with 11 hours, 47 minutes of daylight and the longest day is September 1, with 13 hours, 8 minutes of daylight.
Hours of Daylight and Twilight in September
The earliest sunrise of the month in Mattawan is 7:08 AM on September 1 and the latest sunrise is 31 minutes later at 7:39 AM on September 30.
The latest sunset is 8:16 PM on September 1 and the earliest sunset is 51 minutes earlier at 7:25 PM on September 30.
Daylight saving time is observed in Mattawan 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 6:06 AM and sets 15 hours, 16 minutes later, at 9:23 PM, while on December 21, the shortest day of the year, it rises at 8:08 AM and sets 9 hours, 6 minutes later, at 5:14 PM.
Sunrise & Sunset with Twilight in September
The chance that a given day will be muggy in Mattawan is very rapidly decreasing during September, falling from 24% to 4% over the course of the month.
For reference, on August 1, the muggiest day of the year, there are muggy conditions 38% of the time, while on November 16, 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 Mattawan is gradually increasing during September, increasing from 4.7 miles per hour to 5.6 miles per hour over the course of the month.
For reference, on January 15, the windiest day of the year, the daily average wind speed is 7.1 miles per hour, while on August 4, the calmest day of the year, the daily average wind speed is 4.3 miles per hour.
Average Wind Speed in September
Wind Direction in September
Mattawan is located near a large body of water (e.g., ocean, sea, or large lake). This section reports on the wide-area average surface temperature of that water.
The average surface water temperature in Mattawan is rapidly decreasing during September, falling by 7°F, from 70°F to 63°F, over the course of the month.
Average Water Temperature in September
The average daily incident shortwave solar energy in Mattawan is decreasing during September, falling by 1.3 kWh, from 5.5 kWh to 4.2 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 Mattawan are 42.209 deg latitude, -85.784 deg longitude, and 860 ft elevation.
The topography within 2 miles of Mattawan contains only modest variations in elevation, with a maximum elevation change of 177 feet and an average elevation above sea level of 868 feet. Within 10 miles also contains only modest variations in elevation (371 feet). Within 50 miles contains only modest variations in elevation (574 feet).
The area within 2 miles of Mattawan is covered by trees (44%), cropland (39%), and artificial surfaces (17%), within 10 miles by trees (44%) and cropland (42%), and within 50 miles by cropland (55%) and trees (22%).
This report illustrates the typical weather in Mattawan 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 Mattawan.
For each station, the records are corrected for the elevation difference between that station and Mattawan 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 Mattawan is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between Mattawan and a given station.
The stations contributing to this reconstruction are: Kalamazoo-Battle Creek International Airport (52%, 19 kilometers, east); Hree Rivers Municipal Dr Haines Airport (24%, 32 kilometers, southeast); South Haven Area Regional Airport (16%, 42 kilometers, west); and Michigan City Municipal Airport-Phillips Field (8%, 70 kilometers, southwest).
Time zones for aiports and weather stations are provided by AskGeo.com .