Dade counties are under an excessive heat warning Saturday until 6 p.m., the National Weather Service said. This is issued when heat index values are expected to be 110 or higher for at least two hours.

South Florida is no stranger to the heat, nor the constant heat advisories issued by the National Weather Service. But a warning issued Saturday about the weather calls for a bit more concern. Miami-Dade and Broward counties are under an “excessive heat warning” expected to last until 6 p.m, according to the NWS.

An “unseasonably” hot Saturday is in store for all of South Florida just eight days before the beginning of fall, forecasters say.