Across the Northeast, temperatures did drop a couple of degrees but remained above average.
Phoenix will be above 110 degrees Fahrenheit through at least Monday.
Severe weather possible for Northern Plains
High temperatures will fuel storms in the Northern Plains Wednesday evening into Thursday morning.
The highest risk areas for severe thunderstorms include Nebraska and the Dakotas.
Severe thunderstorms with 60 mph winds, hail, and heavy rain are the greatest concerns.
Wildfire danger lingers out West
In the western U.S., red flag warnings have been issued on Wednesday for high fire danger.
A combination of high temperatures, low humidity, and windy conditions continue to bring increased wildfires risk.
Eight western states have at least some wildfire advisory issued.
Those critical wildfire conditions are forecast to stick around, as the worsening drought across the West continues.
A wildfire that's burning in Colorado has closed Interstate 70 and spurred evacuations. The Grizzly Creek Fire has burned some 3,200 acres and is 0% contained.
Rockfall has been reported along I-70, likely due to burned vegetation no longer holding rocks in place, FOX31 reported.
Communities east of Glenwood Springs have been evacuated, according to the Garfield County Sheriff's Office.
The cause of that blaze remains under investigation.
Fox News' Travis Fedschun contributed to this report.