(9:00AM – Friday, August 15th, 2025) Hot temperatures and low/moderate humidity today…
Timing…
•Friday, August 15th
Location…
•All of Illinois.
Discussion…
•A heat wave will begin in earnest across the state today, with temperatures on the rise. High temperatures across the state today will generally range from around 90° to the upper 90’s. While humidity levels will be on the rise as well, conditions will generally stay at low to moderate levels. This will lead to heat index values state-wide in the low 90’s to low 100’s, highest across Western and Southern Illinois.