Thunderstorms, Heat Advisory For North Florida

JACKSONVILLE, Florida – The National Weather Service in Jacksonville has issued a forecast for North Florida predicting scattered showers and thunderstorms with a potential for isolated strong storms and locally heavy rainfall on Friday, August 15, 2025, along with a Heat Advisory, with increased thunderstorm risks through Saturday.

According to NWS Jacksonville, isolated to scattered thunderstorms will form along and west of I-95 by early to mid-afternoon, influenced by the Atlantic and Gulf coast sea breezes.

Stronger thunderstorms could develop later during peak heating, potentially leading to locally heavy rainfall and localized flooding, especially in coastal southeast Georgia on Saturday.

General storm activity is expected from 1 PM to 10 PM, with strong storms possible from 3 PM to 9 PM. On Saturday, showers and thunderstorms will be more widespread.

Storms will be capable of producing:

• Heavy downpours, with rainfall rates up to 2.5 inches per hour, which may lead to localized flooding, mainly in urban areas.
• Frequent lightning.
• Gusty winds up to 45-55 mph from wet downbursts.

North Florida cities at risk for thunderstorms include regions within the shaded area such as:

• Lake City
• Jacksonville
• Gainesville
• Ocala
• Palatka
• Live Oak

A Heat Advisory is in effect from 11 AM to 7 PM today, with heat indices of 108-112°F due to high temperatures in the low to mid 90s and high humidity.

Jacksonville Weather Forecast

Today (Friday)
A 50 percent chance of showers and thunderstorms, mainly after 2pm. Partly sunny and hot, with a high near 96. Heat index values as high as 110. Light and variable wind becoming east around 6 mph. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms. Heat Advisory in effect until 7 PM.

Tonight
A 30 percent chance of showers and thunderstorms, mainly before 10pm. Mostly cloudy, with a low around 79. Southeast wind around 6 mph becoming calm in the evening.

Saturday
A chance of showers, then showers and thunderstorms likely after 11am. Mostly sunny, with a high near 94. Heat index values as high as 106. Calm wind becoming east 5 to 8 mph in the morning. Chance of precipitation is 70%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

Saturday Night
Showers and thunderstorms likely, mainly before 8pm. Mostly cloudy, with a low around 78. East wind 5 to 7 mph becoming calm in the evening. Chance of precipitation is 60%.