Miami woke Thursday to clear, calm conditions and temperatures near 79 degrees before sunrise, but the quiet opening will give way to another steamy, storm-prone day. Humidity was already close to 89% at Miami International Airport, setting the stage for a heat index that could reach 108 degrees.
Thursday Starts Bright, Then Turns Stormy
Mostly sunny skies should hold through the morning before showers and thunderstorms become possible after 8 a.m. The National Weather Service in Miami is forecasting a high near 89 degrees, southeast winds of 5 to 10 mph and a 50% chance of rain.
The strongest storms could bring frequent lightning, gusty winds and brief heavy downpours, with rainfall rates high enough to cause localized flooding in urban and poor-drainage areas. The National Weather Service says slow-moving storms can still create trouble in a hurry. According to Miami-Dade County, residents can enter their address into the county’s interactive Flood Zone Maps tool to check their local flood zone. Miami-Dade County Public Works says the county’s Stormwater Utility was established in 1991 to manage stormwater pollution and provide adequate flood protection.
Rainfall amounts can exceed design return frequency storm criteria.
Rain Chances Climb Into The Holiday Weekend
Friday looks wetter, with daytime highs in the upper 80s to lower 90s and an 70% chance of showers and thunderstorms. Storms may develop later and push inland as the afternoon progresses, with showers and thunderstorms possible through much of the day and evening, while Friday night stays warm and muggy with a low around 82 and a 50% rain chance.
The latest update adds detail to Wednesday’s Hoodline forecast, keeping the active pattern in place through the weekend. Saturday and Sunday are both expected to reach about 88 degrees, with rain chances around 80% on each day.
Labor Day on Monday brings little relief: showers and thunderstorms are expected, with highs of 87 to 88 degrees and an 80% chance of rain. The unsettled pattern could continue into Tuesday and Wednesday, when highs remain near 89 and storm chances stay between 50% and 60%.
Heat Stays In The Background
Storms will not erase the heat, especially with overnight lows mostly in the low 80s. Peak heat-index values are expected to run from roughly 103 to 108 degrees through the weekend, while generally light southeast or south winds offer limited relief.
Outdoor Plans Need A Backup
Rain chances will generally increase during the afternoon as sea breezes help trigger storms, making earlier outdoor plans the safer bet when possible. Anyone who hears thunder should move indoors, avoid flooded roads and wait until the storm has passed before returning outside.
No watches, warnings or advisories are listed in the supplied forecast. Even so, lightning, sudden wind gusts and fast-moving downpours can make beach, park and holiday activities change quickly.
