Florida Heat Wave 2025. From jacksonville to naples, the hottest, steamiest days of summer will multiply through the next 30 years as climate change makes florida and much of the country swelter, a. Overall, florida will lead the nation in dangerous days of heat indices over 100 degrees, making up 18 of the top 20 counties for the largest difference in the number of days.

Heat index values will be over 105 degrees and could cause heat illnesses. That breaks the old record of 98 degrees for this date, last reached in 1987.