National Weather Service Miami Rain Chances map for South Florida on Sunday, September 20, 2026
MIAMI, Florida – The National Weather Service in Miami forecasts another wet day across South Florida on Sunday, September 20, 2026, with scattered to numerous showers and thunderstorms especially during the afternoon and early evening.
An upper-level low over the eastern Gulf continues to hold deep tropical moisture in place. Additional storm rounds remain likely into next week as that moisture lingers over the peninsula.
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. Saturday brought additional localized showers. That leftover water keeps the flood threat elevated 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 in many spots, 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, with that threat lingering into midweek. Isolated totals of 2–4 inches remain possible if storms train over the same neighborhoods.
Rain chances (Sunday, September 20, 2026):
Heat risk continues today — High temperatures will rise into the upper 80s to around 90 across most of South Florida, with forecast highs near 88–89°F in Miami, Fort Lauderdale, and West Palm Beach, about 88°F in Naples, and around 91°F in Everglades City.
Peak heat index values will range from about 97°F to 102°F, with the highest readings expected near Immokalee at 102°F; Miami and Fort Lauderdale at 100°F; and around 99°F in West Palm Beach, Naples, Homestead, Everglades City, La Belle, and Buckhead Ridge. Belle Glade is near 98°F and Flamingo near 97°F. Clouds and storms should keep values from climbing higher in some inland areas that see afternoon convection.
Today (Sunday): A slight 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 97–102. Light north to east winds becoming southeast around 5 mph. Chance of precipitation is about 68–74% in the east metro and 43–64% inland and along the southwest coast.
Tonight: Showers and thunderstorms likely, mainly in the evening, then a chance of showers after midnight. Mostly cloudy and humid, with a low around 76–79. Light northeast winds becoming variable. Chance of precipitation is 60–70%.
Monday: Showers and thunderstorms likely, mainly after midafternoon. Partly sunny between storms, with a high near 88. Heat index values again near 100. Light winds becoming south around 5 mph. Chance of precipitation is 60–80%.
Monday Night: Showers likely with thunderstorms, especially in the evening. Mostly cloudy, with a low around 76–78. Light south wind. Chance of precipitation is 60–70%.
Tuesday: Rain chances climb again as deeper moisture returns, with showers and thunderstorms likely and daytime probabilities of 70–90%. High near 88. Urban flooding will remain a concern if storms repeatedly train over the same neighborhoods through midweek.
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