Updated

Forecasters at FOX29/WFLX issued a First Alert forecast updated at 10:38 a.m. EDT on September 9, 2026, describing a typical humid September pattern as deep tropical moisture blanketed the Palm Beaches and Treasure Coast in southeastern Florida. After a morning mix of sun and clouds, temperatures were expected to climb into the upper 80s to around 90 degrees, with oppressive humidity pushing heat index values to between 100 and 105 degrees. The forecast called for scattered thunderstorms to develop during the afternoon, with region-wide rain chances of 40 to 50 percent and the potential for heavy downpours, frequent lightning and gusty winds; overnight lows were forecast in the upper 70s to low 80s. The combination mattered for residents and outdoor workers because such heat index levels raise the risk of heat illness, while slow-moving storms with intense lightning present hazards for travel, coastal activity and localized street flooding in a densely populated stretch of Florida's Atlantic coast.