National Weather Service Miami Rain Chances map for South Florida on Saturday, September 19, 2026
MIAMI, Florida – The National Weather Service in Miami forecasts a wet weekend across South Florida on Saturday, September 19, 2026, with scattered to numerous showers and thunderstorms especially during the afternoon and early evening.
An upper-level low settling into the eastern Gulf will keep deep moisture in place through Sunday, with additional storm rounds likely into next week.
Recent rain has already soaked much of the metro. NWS radar estimates from 5 p.m. Tuesday through 5 p.m. Friday showed about 4–11 inches in metro Palm Beach County, 2–7 inches in metro Broward County, 1–4 inches in metro Miami–Dade County, and 2–4 inches in metro Collier County.
Friday added another widespread 2–4 inches across metro Broward and Palm Beach, while most of metro Miami-Dade stayed under 1 inch. That leftover water raises the flood threat if storms stall over the same neighborhoods today.
Morning coverage should stay more isolated, with the best storm chances building this afternoon into early evening. Widely scattered coastal showers can linger overnight. Mean rainfall is only about a quarter to a half inch, but slow storm motion can still produce several inches in a short time.
Primary hazards include frequent lightning, gusty winds, and localized heavy downpours. Urban and poor-drainage flooding remains the main concern, especially in spots hit hard since Tuesday.
The Weather Prediction Center kept far southern Florida in a marginal risk of excessive rainfall today and Sunday. Isolated weekend totals of 2–4 inches are possible in South Florida, with a few spots higher if storms train.
Rain chances (Saturday, September 19, 2026):
Heat risk continues today — High temperatures will rise into the upper 80s to low 90s across most of South Florida, with forecast highs near 88–89°F in Miami, Fort Lauderdale, and West Palm Beach, and around 89–92°F in Naples and Everglades City.
Peak heat index values will range from about 98°F to 103°F, with the highest readings expected near Immokalee, La Belle, and Miami at 103°F; Buckhead Ridge, West Palm Beach, and Everglades City at 102°F; and around 100°F in Naples, Belle Glade, Fort Lauderdale, and Homestead. Flamingo is forecast near 98°F. Clouds and storms should keep values from climbing higher in some inland areas that see afternoon convection.
Today (Saturday): A chance of showers and thunderstorms this morning, then showers and thunderstorms likely this afternoon and early evening. Partly sunny between storms, with a high near 88–89. Heat index values as high as 100–103. Light north to east winds 3 to 6 mph. Chance of precipitation is about 55–63% in the east metro and 47–60% inland and along the southwest coast.
Tonight: A chance of showers and thunderstorms, mainly in the evening. Mostly cloudy and humid, with a low around 76–79. Light northeast winds becoming variable after midnight. Chance of precipitation is 40–60%.
Sunday: Scattered to numerous showers and thunderstorms, mainly after midafternoon. Partly sunny between storms, with a high near 88–89. Heat index values again near 100. Light winds becoming southeast around 5–6 mph. Chance of precipitation is 60–80%, with several locations seeing afternoon probabilities near 80–95%.
Sunday Night: Showers likely with thunderstorms, especially in the evening. Mostly cloudy, with a low around 76–78. Light southeast wind. Chance of precipitation is 70–80%.
Monday: Rain chances climb again as deeper moisture returns, with showers and thunderstorms likely and daytime probabilities of 80–90%. High near 88. Urban flooding will remain a concern if storms repeatedly train over the same neighborhoods through midweek.
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