Average Weather in August in Ionia Michigan, United States
In Ionia, the month of August is characterized by gradually falling daily high temperatures, with daily highs decreasing by 4°F, from 80°F to 76°F over the course of the month, and rarely exceeding 88°F or dropping below 67°F.
Daily low temperatures decrease by 4°F, from 61°F to 57°F, rarely falling below 47°F or exceeding 70°F.
For reference, on July 19, the hottest day of the year, temperatures in Ionia typically range from 62°F to 81°F, while on January 29, the coldest day of the year, they range from 17°F to 30°F.
Average High and Low Temperature in August
The figure below shows you a compact characterization of the hourly average temperatures for the quarter of the year centered on August. 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 August
The month of August in Ionia experiences essentially constant cloud cover, with the percentage of time that the sky is overcast or mostly cloudy remaining about 34% throughout the month. The lowest chance of overcast or mostly cloudy conditions is 33% on August 10.
The clearest day of the month is August 10, with clear, mostly clear, or partly cloudy conditions 67% of the time.
For reference, on January 5, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 68%, while on August 10, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 67%.
Cloud Cover Categories in August
A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. In Ionia, the chance of a wet day over the course of August is gradually decreasing, starting the month at 34% and ending it at 30%.
For reference, the year's highest daily chance of a wet day is 34% on August 5, and its lowest chance is 17% on February 4.
Probability of Precipitation in August
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 August in Ionia is essentially constant, remaining about 3.0 inches throughout, and rarely exceeding 5.3 inches or falling below 1.2 inches.
Average Monthly Rainfall in August
Over the course of August in Ionia, 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, 17 minutes, implying an average daily decrease of 2 minutes, 35 seconds, and weekly decrease of 18 minutes, 2 seconds.
The shortest day of the month is August 31, with 13 hours, 12 minutes of daylight and the longest day is August 1, with 14 hours, 30 minutes of daylight.
Hours of Daylight and Twilight in August
The earliest sunrise of the month in Ionia is 6:31 AM on August 1 and the latest sunrise is 32 minutes later at 7:03 AM on August 31.
The latest sunset is 9:01 PM on August 1 and the earliest sunset is 45 minutes earlier at 8:16 PM on August 31.
Daylight saving time is observed in Ionia during 2017, but it neither starts nor ends during August, so the entire month is in daylight saving time.
For reference, on June 21, the longest day of the year, the Sun rises at 6:01 AM and sets 15 hours, 22 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, 0 minutes later, at 5:08 PM.
Sunrise & Sunset with Twilight in August
We base the humidity comfort level on the dew point, as it determines whether perspiration will evaporate from the skin, thereby cooling the body. Lower dew points feel drier and higher dew points feel more humid. Unlike temperature, which typically varies significantly between night and day, dew point tends to change more slowly, so while the temperature may drop at night, a muggy day is typically followed by a muggy night.
The chance that a given day will be muggy in Ionia is rapidly decreasing during August, falling from 35% to 23% over the course of the month.
For reference, on July 28, the muggiest day of the year, there are muggy conditions 35% 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 August
This section discusses the wide-area hourly average wind vector (speed and direction) at 10 meters above the ground. The wind experienced at any given location is highly dependent on local topography and other factors, and instantaneous wind speed and direction vary more widely than hourly averages.
The average hourly wind speed in Ionia is gradually increasing during August, increasing from 7.8 miles per hour to 8.3 miles per hour over the course of the month.
For reference, on January 12, the windiest day of the year, the daily average wind speed is 12.4 miles per hour, while on August 3, the calmest day of the year, the daily average wind speed is 7.7 miles per hour.
The lowest daily average wind speed during August is 7.7 miles per hour on August 4.
Average Wind Speed in August
Wind Direction in August
Ionia 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 Ionia is essentially constant during August, remaining within 1°F of 70°F throughout.
The highest average surface water temperature during August is 71°F on August 14.
Average Water Temperature in August
This section discusses the total daily incident shortwave solar energy reaching the surface of the ground over a wide area, taking full account of seasonal variations in the length of the day, the elevation of the Sun above the horizon, and absorption by clouds and other atmospheric constituents. Shortwave radiation includes visible light and ultraviolet radiation.
The average daily incident shortwave solar energy in Ionia is gradually decreasing during August, falling by 0.9 kWh, from 6.4 kWh to 5.5 kWh, over the course of the month.
Average Daily Incident Shortwave Solar Energy in August
For the purposes of this report, the geographical coordinates of Ionia are 42.987 deg latitude, -85.071 deg longitude, and 784 ft elevation.
The topography within 2 miles of Ionia contains only modest variations in elevation, with a maximum elevation change of 226 feet and an average elevation above sea level of 738 feet. Within 10 miles also contains only modest variations in elevation (266 feet). Within 50 miles contains only modest variations in elevation (673 feet).
The area within 2 miles of Ionia is covered by cropland (52%), artificial surfaces (30%), and trees (17%), within 10 miles by cropland (77%) and trees (18%), and within 50 miles by cropland (66%) and trees (23%).
This report illustrates the typical weather in Ionia 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 Ionia.
For each station, the records are corrected for the elevation difference between that station and Ionia 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 Ionia is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between Ionia and a given station.
The stations contributing to this reconstruction are: Gerald R. Ford International Airport (29%, 39 kilometers, west); Lansing, Capital City Airport (22%, 46 kilometers, southeast); Gratiot Community Airport (21%, 49 kilometers, northeast); Fitch H Beach Airport (19%, 51 kilometers, southeast); and Roben-Hood Airport (8%, 88 kilometers, northwest).
All data relating to the Sun's position (e.g., sunrise and sunset) are computed using astronomical formulas from the book, Astronomical Tables of the Sun, Moon and Planets , by Jean Meeus.
All other weather data, including cloud cover, precipitation, wind speed and direction, and solar flux, come from NASA's MERRA-2 Modern-Era Retrospective Analysis . This reanalysis combines a variety of wide-area measurements in a state-of-the-art global meteorological model to reconstruct the hourly history of weather throughout the world on a 50-kilometer grid.
Land Use data comes from the Global Land Cover SHARE database , published by the Food and Agriculture Organization of the United Nations.
Elevation data comes from the Shuttle Radar Topography Mission (SRTM) , published by NASA's Jet Propulsion Laboratory.
Names, locations, and time zones of places and some airports come from the GeoNames Geographical Database .
Time zones for aiports and weather stations are provided by AskGeo.com .
Maps are © Esri, with data from National Geographic, Esri, DeLorme, NAVTEQ, UNEP-WCMC, USGS, NASA, ESA, METI, NRCAN, GEBCO, NOAA, and iPC.
The information on this site is provided as is, without any assurances as to its accuracy or suitability for any purpose. Weather data is prone to errors, outages, and other defects. We assume no responsibility for any decisions made on the basis of the content presented on this site.
We draw particular cautious attention to our reliance on the MERRA-2 model-based reconstructions for a number of important data series. While having the tremendous advantages of temporal and spatial completeness, these reconstructions: (1) are based on computer models that may have model-based errors, (2) are coarsely sampled on a 50 km grid and are therefore unable to reconstruct the local variations of many microclimates, and (3) have particular difficulty with the weather in some coastal areas, especially small islands.