Saturday, June 20, 2026, started off thick and sticky in Miami, with a smoke-hazed sky and temperatures already stuck in the upper 70s. The tag team of wildfire smoke and high humidity will make it feel far hotter than the numbers on the thermometer suggest as the day wears on.
Heat Advisory Today
A Heat Advisory is in effect for much of South Florida from noon to 6 p.m. EDT, with the heat index expected to climb into the 105 to 110°F range in some spots. That kind of heat can turn afternoon outdoor work into a health hazard. Forecast highs are near 89°F along the coast and around 90°F inland, and overnight lows are expected to stay in the low 80s, so the usual nighttime cooldown will be limited. For official details and any updates, check the National Weather Service Miami.
Smoke And Air Quality
Smoke from active wildfires in west Miami-Dade has been drifting over the metro this morning, leaving behind hazy skies and even some ash in parts of the city. Anyone with asthma or other breathing issues should keep outdoor time to a minimum. Keeping windows closed, running air conditioning on recirculate when possible, and putting off strenuous outdoor plans are your best bets until the air improves. Miami-Dade County offers guidance and an air quality notification service for residents; see Miami-Dade County Air Quality for the latest advisories.
Afternoon Storm Chances
The smoke is expected to thin out by late morning, but the atmosphere will not calm down completely. A 30 to 40 percent chance of showers and thunderstorms is in the forecast for the afternoon and early evening, especially inland where sea breezes collide. Any storms that bubble up are likely to move slowly and can dump brief heavy rain and kick up gusty winds, although widespread flooding is not anticipated. If you are heading outside, plan runs or other workouts for early morning, carry water, and keep an eye on radar for fast-developing storms.
Commuters should be ready for hot, muggy conditions through the afternoon and brief downpours that can quickly snarl traffic. Boaters are advised to hold off on nonessential trips until storms move through. If you or someone nearby shows signs of heat exhaustion or has trouble breathing because of the smoke, get to a cooler spot with cleaner air and seek medical help if symptoms are severe.
