Heat Advisory, Thunderstorms For North Florida

JACKSONVILLE, Florida – The National Weather Service in Jacksonville has issued a forecast for North Florida predicting numerous showers and thunderstorms with a potential for isolated strong storms and locally heavy rainfall on Saturday, August 16, 2025, along with a Heat Advisory, with increased thunderstorm risks through Sunday.

According to NWS Jacksonville, thunderstorms will develop this afternoon with isolated stronger storms as a front moves south into the area, allowing storms to continue later across southeast Georgia.

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

General storm activity is expected from 1 PM to 11 PM, with strong storms possible from 3 PM to 10 PM (thunderstorms continue over Southeast Georgia until midnight). On Sunday, 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 (Saturday)
Showers and thunderstorms likely, mainly after 5pm. Some of the storms could produce heavy rainfall. Partly sunny and hot, with a high near 94. Heat index values as high as 109. East wind 3 to 7 mph. Chance of precipitation is 60%. 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
Showers and thunderstorms likely, mainly before 8pm. Some of the storms could produce heavy rainfall. Mostly cloudy, with a low around 77. Northeast wind around 5 mph becoming calm in the evening. Chance of precipitation is 60%. New rainfall amounts between a quarter and half of an inch possible.

Sunday
Showers likely, then showers and possibly a thunderstorm after 11am. High near 90. Light north wind becoming northeast 5 to 10 mph in the morning. Winds could gust as high as 16 mph. Chance of precipitation is 80%. New rainfall amounts between a quarter and half of an inch possible.

Sunday Night
Showers and possibly a thunderstorm before 8pm, then a slight chance of showers and thunderstorms between 8pm and 2am. Low around 77. Northeast wind 3 to 7 mph. Chance of precipitation is 80%.