The extreme heat that set records in the Northern Plains over the past weekend is shifting east into the Midwest, bringing the hottest temperatures of the year to the Midwest, and around the Great Lakes, including Chicago, which is forecast to experience its worst heat wave since 2020.
AccuWeather meteorologists forecast highs in the mid-90s across the region Tuesday and Wednesday, with AccuWeather RealFeel® Temperatures above 105°.
The combination of mid-90s temperatures and high humidity can increase the risk of heat-related illness, especially for people spending long periods outdoors, older adults, young children and people without reliable access to cooling.
“Dew point temperatures will, on average, be 5-8 degrees Fahrenheit lower in the Midwest and Northeast with this heat dome compared to early July,” AccuWeather Senior Meteorologist Alex Sosnowski said. “Slightly less humid air may allow temperatures to fall off a bit more at night compared to the early days in July. But, if you are laboring away in the heat or spending time outdoors for recreation, it will still be hot and feel quite humid.”
Though the heat wave won’t persist as long as the Fourth of July heat dome, the AccuWeather Heat Wave Counter and Severity Index™ scores it as the strongest in Chicago since August of 2020.
The Heat Will Continue to Move East Through the Weekend
- High temperatures are expected to climb into the 90s to near 100 degrees across portions of the Ohio Valley, Mid-Atlantic and Northeast
- AccuWeather RealFeel® Temperatures exceeding 100 degrees in many areas, including Philadelphia, New York City and Washington D.C., due to high humidity
AccuWeather HeatWave Counter and Severity Index™
The exclusive AccuWeather HeatWave Counter and Severity Index™ has been developed by AccuWeather to properly measure and compare heat waves. It considers the magnitude, duration, and intensity of each heat wave so they can be compared. For this purpose, AccuWeather defines heat waves as consisting of at least three or more consecutive days in which the high temperature exceeds a location-specific threshold.
AccuWeather RealFeel® Temperature
AccuWeather RealFeel® Temperature, which was patented, combines 14 factors to provide the most accurate measure of how representative the current or forecast weather conditions really “feel” to an appropriately dressed person. Find your current and forecasted AccuWeather RealFeel® for the sun and the shade on the AccuWeather app.
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