Heat Index Hits 102 Monday as Weekend Storm Chances Build on Treasure Coast

A 102-degree heat index arrives Monday — and the storm pattern that sets it up is already taking shape Saturday morning.

TODAY: Partly sunny skies won't last. A 50% chance of afternoon showers and thunderstorms will develop through the day, the National Weather Service said. Southeast winds will increase from five to ten mph to ten to fifteen mph late in the afternoon and toward sunset. High in the upper 80s. Get outdoor chores done before noon.

TONIGHT: Partly cloudy and humid. Southwest winds ease to five to ten mph. Low in the upper 70s.

THIS WEEK: Sunday brings the highest rain odds of the weekend — 60% — with showers and thunderstorms likely in the late afternoon and evening. Highs near 90. That pattern repeats Monday, again at 60%, but with an important added risk: heat index values reaching 102 as southwest winds shift south and lower 90s temperatures combine with deep summer humidity. If you're working outdoors Monday, schedule breaks and drink water well before the afternoon heating kicks in. The National Weather Service offered no data beyond Monday's forecast window.

ON THE WATER: Light southeast winds — five to ten mph building to ten to fifteen by late Saturday — keep seas relatively manageable, but the afternoon thunderstorm window is a hard stop for boaters. Your fishing window is morning, not afternoon. Skippers leaving Stuart or Fort Pierce inlets should aim to be back at the dock before one p.m. both days. Sunday and Monday feature similar south and southwest winds at five to ten mph. Wave heights were not detailed in National Weather Service coastal data for this period. Officials said

ALERTS: No active National Weather Service watches, warnings, or advisories were in effect for Martin, St. Lucie, or Indian River Counties at the time of this forecast. That can change rapidly during Florida's rainy season — check weather.gov for real-time updates before heading out.

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