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Miami, FL Weather Alert: Sunday Storms Could Soak I-95 After Heat Index Climbs to 104°F
Florida – A 104 degree heat index could make Miami feel scorching Sunday before thunderstorms&…
By Lauren Beckett · 2026-09-12T04:28:50.516Z
Florida – A 104 degree heat index could make Miami feel scorching Sunday before thunderstorms spread across South Florida by late afternoon. The unsettled pattern then stretches through the workweek, with rain chances eventually reaching 80%.
According to the National Weather Service, Miami faces a 70% chance of showers and thunderstorms Sunday. Storms become likely mainly before 5 p.m., then showers remain likely with possible thunder after 5 p.m.
Sunday reaches about 89 degrees, but humidity pushes heat index values as high as 104.
That combination makes heat the first concern before storms arrive. Limit strenuous outdoor activity, drink water regularly and seek air conditioning during prolonged exposure.
Drivers on I 95, Florida& 39;s Turnpike and the Dolphin Expressway should prepare for rapidly changing visibility beneath thunderstorms. Heavy downpours can quickly leave water on South Florida roads.
Sunday evening retains a 30% thunderstorm chance before 8 p.m.
Monday offers no complete break. Miami reaches 89 degrees again, with a 40% chance of showers and thunderstorms mainly after 2 p.m. A 30% storm chance remains into Monday evening.
Tuesday brings another 89 degree afternoon. Storm chances increase to 60%, mainly after 2 p.m. East winds reach 7 to 13 mph, with gusts up to 18 mph.
The wettest period shown may arrive Wednesday. Rain chances climb to 80%, with showers and thunderstorms likely. The high reaches about 88.
Thursday keeps a 70% storm chance with another high near 88.
The provided NWS data does not identify a specific tornado threat. Still, lightning and heavy rain remain concerns whenever thunderstorms develop.
For now, Sunday& 39;s combination of a 104 degree heat index and 70% storm risk deserves attention. Keep indoor alternatives ready and monitor changing conditions before traveling. Seeing storms around Miami Sunday? Tell us what conditions look like where you are.
Five Day Weather Outlook for Miami, FL
Sunday: Showers and thunderstorms likely. High near 89°F. Heat index up to 104°F. Rain chance 70%. Monday: Mostly sunny with a 40% chance of showers and thunderstorms, mainly after 2 p.m. High near 89°F. Tuesday: Mostly sunny with showers and thunderstorms likely after 2 p.m. High near 89°F. Rain chance 60%. Wednesday: Showers and thunderstorms likely. High near 88°F. Rain chance 80%. Thursday: Showers and thunderstorms likely. High near 88°F. Rain chance 70%.