Miami is starting Labor Day clear, calm and nearly 80 degrees, but the quiet morning will not last. Showers and thunderstorms are expected to build after 7 a.m., with a high near 89 and a heat index reaching 106 degrees.
Humidity is already running high before sunrise, and light southwest winds will give way to a more active afternoon pattern. The National Weather Service in Miami puts the chance of rain at 70%, with a quarter- to half-inch of rain possible.
Afternoon Storms Bring Lightning And Flooding Risk
The storm threat should increase through the afternoon, with the highest hourly rain chances arriving between about 2 p.m. and 6 p.m. Stronger storms could bring frequent lightning, gusty winds, brief heavy downpours and isolated damaging wind gusts.
Slow-moving storms may also cause localized street flooding, especially in urban neighborhoods and areas with poor drainage. There are no watches, warnings or advisories listed for Miami-Dade in the current forecast, but residents should move indoors when thunder is heard and avoid driving through water-covered streets. Miami-Dade County says heavy rain can quickly overwhelm drainage systems and flood streets, reinforcing the risk of localized urban flooding during downpours. According to Miami-Dade County, residents can use the county’s interactive Flood Zone Maps tool to view the flood zone for a specific address.
Storm Chances Continue Through The Week
Tuesday through Thursday will remain hot, with highs near 89 degrees and daily storm chances around 50%. Friday could reach 90 degrees with a 60% chance of showers and thunderstorms, while Saturday and Sunday will stay near 90 with additional storm chances.
According to the National Oceanic and Atmospheric Administration’s National Centers for Environmental Information, a line of thunderstorms on Sep 26, 1982, produced very heavy rain, strong winds and funnel clouds, with three inches of rain falling in a half hour.
Overnight lows will remain around 81 to 83 degrees along the coast, offering little relief from the humidity. The updated outlook extends the unsettled pattern described in Hoodline’s Sunday forecast, so beach trips, park plans and outdoor Labor Day gatherings should keep an indoor backup nearby.
