Miami woke up early Sunday to a sticky start. At 5:35 a.m. EDT on June 21, 2026, Miami International Airport reported clear skies and 77°F, paired with a muggy 73°F dew point. Haze from lingering wildfire smoke is hanging around, humidity is already high, and the air will feel heavy well before the sun gets aggressive. Afternoon highs should reach near 90°F, with heat-index values pushing into the low 100s, so outdoor plans will be more comfortable in the cooler morning or later in the evening. Hydration is not optional today.
Afternoon Storms And Heat
Scattered showers and slow-moving thunderstorms are most likely late this afternoon into the evening on Sunday, June 21, 2026. Rain chances climb to around 40%, and while most neighborhoods will see light totals, a few stubborn cells could dump an inch or more of rain and trigger brief street flooding. South winds of 5 to 9 mph will help keep inland spots among the hottest, with heat indices this afternoon hovering near 100 to 103°F. Forecast details and the Air Quality Alert come from the National Weather Service in Miami.
Air Quality Alert
An Air Quality Alert for fine particulate pollution issued June 20 remains in effect through 10 a.m. EDT Sunday. People with asthma, COPD, heart disease, older adults, children, and pregnant people should avoid long stretches of strenuous outdoor activity. Smoke from recent wildfires is driving the haze and may trim visibility at times across Miami-Dade and Broward. We broke down the earlier smoke and heat problems in more detail in our June 18 heat alert coverage, which rounded up local observations and official responses.
How To Stay Safe
To keep your day from going sideways, dial back heavy outdoor work during peak afternoon heat, drink plenty of water, and head indoors if the smoke smell strengthens or you notice breathing trouble. The City operates 22 seasonal cooling centers and libraries where residents can escape the heat, and you can find locations and hours on the City of Miami website. If you are heading to the water, expect light southeast winds and seas under 2 feet, but treat any nearby thunderstorm as hazardous and get back to shore quickly.
