Thunderstorms, Triple-Digit Heat Index For South Florida

Published by

FLORIDA WORD

July 20, 2026 10:37 am

National Weather Service Rain Chances for Florida Florida on Nonday, July 20, 2026.

MIAMI, Florida – The National Weather Service in Miami forecasts scattered showers and thunderstorms developing this afternoon, favoring inland and northern South Florida. A slight chance of showers and thunderstorms is expected today.

Any stronger cells may produce gusty winds, heavy downpours, localized flooding in poor drainage areas, frequent lightning, and small hail. Frequent lightning will be the primary hazard where storms develop.

Today’s South Florida Rain Chances

Rain chances (Monday, July 20, 2026): Slight chance overall, with the best chances across northern and interior areas this afternoon.

West Palm Beach: 48%
Clewiston: 44%
Naples: 53%
Immokalee: 39%
Everglades City: 42%
Fort Lauderdale: 34%
Miami: 22%
Homestead: 19%
Flamingo: 22%
Palmdale: 35%

Heat Continues Today

High temperatures will rise into the low to mid 90s across most of South Florida. Peak Heat Index Values will range from 102°F to 110°F this afternoon, with the highest readings across urban areas.

Maximum Heat Index – Monday Afternoon, July 20, 2026

A Heat Advisory is in effect for Miami-Dade and Broward counties from 11 AM until 7 PM EDT today as heat index values are expected to reach 104–110°F in metro areas.

Miami Weather Forecast

Today

A 30 percent chance of showers and thunderstorms, mainly between 1pm and 2pm. Partly sunny, with a high near 93. Heat index values as high as 106. South wind 11 to 14 mph, with gusts as high as 23 mph.

Tonight

Partly cloudy, with a low around 81. South wind 7 to 10 mph.

Tuesday

Mostly sunny, with a high near 93. Heat index values as high as 105. Southeast wind 9 to 11 mph, with gusts as high as 18 mph.

Tuesday Night

Partly cloudy, with a low around 81. Southeast wind 5 to 8 mph.

Wednesday

Sunny, with a high near 93. Light southeast wind increasing to 5 to 10 mph in the morning.

Wednesday Night

Mostly clear, with a low around 81. East wind 3 to 8 mph.

Thursday

Sunny, with a high near 93. Light east wind increasing to 6 to 11 mph in the morning.

Thursday Night

Mostly clear, with a low around 81. East wind 5 to 9 mph becoming light after midnight.

Friday

A 30 percent chance of showers and thunderstorms, mainly after 2pm. Sunny, with a high near 93. Light east wind increasing to 5 to 10 mph in the morning.

Friday Night

A 30 percent chance of showers and thunderstorms before 8pm. Mostly clear, with a low around 81.

Saturday

A 30 percent chance of showers and thunderstorms. Sunny, with a high near 94.

Saturday Night

A 30 percent chance of showers and thunderstorms. Partly cloudy, with a low around 80.

Sunday

A 40 percent chance of showers and thunderstorms. Mostly sunny and hot, with a high near 95.

Published by

FLORIDA WORD

July 20, 2026 10:37 am