Miami is starting Tuesday clear and calm near 81 degrees, but the quiet morning is expected to give way to another hot, stormy afternoon. Temperatures should climb to about 89 degrees, with the heat index reaching as high as 106. The main storm window arrives from roughly 2 to 8 p.m., especially inland.
The latest National Weather Service forecast calls for a 40% chance of showers and thunderstorms across the Miami area Tuesday. The strongest cells could bring frequent lightning, gusty winds and brief heavy downpours, while slow-moving storms may create localized flooding on urban streets and other poorly drained areas. According to Miami-Dade County, higher drainage Level of Service improvements are being implemented in impacted flood-prone areas to alleviate street flooding and control additional private ... A Miami-Dade County resolution dated 17 Mar 2026 says stormwater drainage projects were prioritized and recommended for implementation based on the calculated expected severity of flooding.
Afternoon Storms Could Make A Mess Of Outdoor Plans
Southeast winds will stay light at about 2 to 8 mph, allowing sea-breeze boundaries to help spark storms as the day heats up. Morning sunshine may offer a decent window for errands or outdoor plans, but conditions could turn quickly during the afternoon. Anyone who hears thunder should move indoors, particularly near beaches, parks and open athletic fields.
Tuesday night will remain warm and humid, with a low near 82 degrees and another 40% chance of showers and thunderstorms. Heat index values could still reach about 101 in the evening, so a passing shower may cool the pavement faster than it cools the air.
The National Weather Service Miami history page says temperature records with many breaks begin in 1829, while some rainfall measurements are available beginning in the 1850s. According to NOAA's National Centers for Environmental Information, Miami tied its all-time highest minimum temperature of 84 degrees F (28.9 degrees C) on July 20th and October 12th.
Storm Chances Stay Elevated Through The Weekend
Wednesday brings another high near 89 degrees, a heat index up to 108 and a 50% chance of storms. Rain chances rise to 60% Thursday and Friday, then reach 70% Saturday through Sunday as an easterly flow keeps showers and thunderstorms in the forecast.
There are no watches, warnings or advisories listed for the Miami area in the supplied forecast. Even without a formal alert, lightning, sudden downpours and pockets of street flooding will remain the main hazards through the week.
