Jacksonville is starting Thursday, June 25, 2026, on the sticky side, with mostly clear skies, muggy air and temperatures hovering near 79°F. It will not stay merely warm for long. The afternoon looks hot, with a high around 94°F and heat-index values near 100–101°F, before scattered showers and thunderstorms move in after 2 p.m. The most active period is expected from late afternoon into the evening.
Afternoon Storms And Timing
Scattered showers and thunderstorms are most likely after 2 p.m., with the stronger storms most favored between about 3 and 9 p.m. Storms are expected to fire along the east coast sea breeze, then drift inland, bringing locally heavy downpours and gusty winds. The official forecast calls for typical gusts up to about 20 mph, but forecasters note that isolated stronger cells, mainly between I-95 and US-301 and near the coast, could deliver much higher gusts and slow-moving rain that causes urban ponding. For the latest timing and a closer look at the radar trends, check the National Weather Service.
Heat Through The Weekend
Heat will build into the weekend, with inland highs pushing into the upper 90s and heat-index values climbing into the low to mid 100s. Forecasters are watching Sunday, June 28, and Monday, June 29, when heat-index values may reach 108–110°F and Heat Advisory conditions are possible. The City of Jacksonville Stay Cool Jax page lists Emergency Cooling Centers and activation thresholds. On Sundays and holidays the Main Library at 303 N. Laura St. and the Legends Center at 5130 Soutel Dr. are designated as primary sites. Anyone who works or exercises outdoors should plan for the coolest hours of the day and carry plenty of water.
Beach And Marine Notes
Onshore breezes and a developing southeasterly swell will bring a lower-end moderate rip current risk at area beaches from late Thursday afternoon through Friday. Swimmers should follow lifeguard instructions and head out of the water if storms move in, since lightning and sudden gusts are the most immediate threats. Small-craft operators should be ready for shifting winds and higher gusts in heavier cells.
Plan Ahead
Afternoon storms can quickly reduce visibility and lead to ponding on roadways, so the drive home from about 3 to 9 p.m. could be slow. Moving outdoor events earlier in the day or bringing them indoors is the safest bet. Keep a charged phone, shade and water handy, never drive through flooded streets and pull over during frequent lightning.
