Jacksonville rolled into Sunday under clear, muggy skies and upper-70s temperatures, and it is only going up from there. Today, Sunday, June 28, highs are expected to climb into the mid- to upper-90s, with inland neighborhoods feeling more like 100–106°F during the peak afternoon heat. A late-day sea breeze will trim a couple of degrees off the beaches, but inland streets and parks will stay dangerously hot. If you have to be outside, keep plans short and bring water like it is your plus-one.
Afternoon Heat And Timing
The NWS Jacksonville forecast calls for a high near 96°F with light southwest winds around 2–8 mph and heat-index readings up to about 106°F this afternoon. Inland areas should hit their hottest readings by mid- to late afternoon, while the coast runs a bit cooler once the sea breeze settles in. Showers are unlikely today. The better shot at thunderstorms waits until Monday afternoon and evening.
Monday Into Tuesday: Stronger Storm Threats
On Monday, June 29, the air turns even hotter and more unstable, with highs near 97°F and heat-index values potentially reaching 105–109°F in parts of northeast Florida. Forecasters expect scattered to numerous afternoon and evening thunderstorms Monday and Tuesday. The stronger cells could pack downburst winds of 40–55 mph, frequent lightning and heavy downpours. If you are banking on outdoor time Monday afternoon, keep radar handy and be ready to bolt for shelter fast.
Cooling Options And Safety Tips
The City of Jacksonville runs a "Stay Cool Jax" plan that includes staffed cooling centers and guidance for residents during extreme heat. You can find locations and hours on the city website at the Stay Cool Jax page. When temperatures spike, try to avoid strenuous activity between 11 a.m. and 6 p.m., drink plenty of water, and check on elderly neighbors or anyone without air conditioning. If you or someone nearby feels faint, confused or shows other signs of heat illness, move to a cool place and seek medical help.
Beaches, Boats And What To Watch
Onshore winds, paired with a southeasterly swell, will bump up rip-current risk each afternoon, so swimmers should pay attention to lifeguards and posted flags. Boaters should be ready for sudden storms and gusty winds later in the day and again Monday into Tuesday. Out over the Atlantic, the National Hurricane Center is also keeping tabs on a low-pressure area off the Southeast U.S. coast that has a low, around 20 percent, chance of slow tropical development over the next several days.
Looking Ahead
Temperatures are expected to ease slightly by midweek, with highs near 90°F on Wednesday, July 1, before climbing again as Saturday, July 4, approaches. For the latest forecast details and any advisories, check in with the National Weather Service and watch local city resources for cooling-center announcements. Stay hydrated, and, when you can, shift outdoor activities to the early morning or evening hours.
