Dangerous heat across South Florida continues on Thursday, August 20, 2026, with a heat advisory in effect and heat indices that could reach 112 degrees or higher. The heat wave has prompted a major to extreme risk of heat-related illness for the region.
Heat Advisory in Effect Until 7 P.M.
A heat advisory has been issued for South Florida from 11 a.m. until 7 p.m. due to heat indices that could reach 112 degrees or higher. The heat-related health risk ranges from major to extreme across many South Florida locations on Thursday.
Air Quality Alert for Miami-Dade
An air quality alert was issued for Miami-Dade until 3 p.m. The alert is due to the potential for lower air quality because of smoke associated with a wildfire burning in western Miami-Dade.
Afternoon Highs and Rain Expected
Highs will reach the low to mid-90s Thursday afternoon. Rain will move in later to bring some relief.
Scattered showers and storms that develop may produce gusty winds, lightning, and heavy downpours in spots.
Friday and Weekend Forecast
Friday morning will be mainly quiet and warm, with another round of rain expected in the afternoon and evening. Highs will climb to the low 90s with feels-like temperatures in the 100s.
This weekend will not be quite as hot as the breeze shifts out of the southeast. Showers and storms will bring relief, with highs more seasonable in the low 90s on Saturday and Sunday.
Frequently Asked Questions About South Florida Dangerous Heat
How high could heat indices reach on Thursday?
Heat indices could reach 112 degrees or higher on Thursday across South Florida.
When is the heat advisory in effect?
The heat advisory has been issued from 11 a.m. until 7 p.m. on Thursday.
Why was an air quality alert issued for Miami-Dade?
An air quality alert was issued until 3 p.m. due to the potential for lower air quality because of smoke associated with a wildfire burning in western Miami-Dade.
Are storms expected Thursday afternoon?
Scattered showers and storms that develop may produce gusty winds, lightning, and heavy downpours in spots.
What are the expected temperatures this weekend?
Highs will be more seasonable in the low 90s on Saturday and Sunday as the breeze shifts out of the southeast.
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