Jacksonville woke up sweating on Wednesday, July 15, 2026, with muggy, mostly cloudy skies, temperatures in the mid-70s and humidity near 90 percent. The steamy start will build into a hot afternoon, with a high near 91°F and a heat index that could climb to around 100 to 105°F. Scattered showers and thunderstorms are expected after about 1 p.m., so anyone with outdoor plans should be ready for quick downpours and lightning.
Afternoon Storms
Scattered storms are expected to bubble up this afternoon along sea-breeze collisions, with the greatest chances inland and a roughly 40 to 50 percent probability of showers. Most storms should bring brief heavy rain and frequent lightning rather than widespread damaging winds, although gusts to about 20 mph are possible. Late in the day, conditions may vary a lot from neighborhood to neighborhood, so it is smart to have an indoor backup for outdoor plans, according to NWS Jacksonville.
Where To Cool Off
The city briefly activated its Cooling Center Contingency earlier this week and lists libraries, community centers and pools as relief sites. On designated extreme-heat days, the Main Library (303 N. Laura St.) and the Legends Center (5130 Soutel Dr.) serve as primary emergency cooling centers, and JTA offers free rides to cooling sites on activation days. For locations and hours, see Stay Cool Jax.
Week Ahead
Temperatures are expected to trend upward through the weekend, with highs in the lower to mid-90s, Thursday near 93°F and mid-90s by early next week. Heat-index values are forecast to rise above 100°F. The National Weather Service notes that Heat Advisory conditions are possible Sunday through Tuesday, so it is wise to schedule strenuous outdoor work for the cooler morning hours and keep water and shade close by, according to NWS Jacksonville.
Beach And Commute Tips
Rip-current risk is expected to remain low at area beaches for the next several days, but it is never safe to swim during lightning, and beachgoers should move inland if storms approach. Heavy downpours can trigger brief, localized street flooding during the late-day commute, so drivers should allow extra travel time and steer clear of standing water. If you or someone nearby shows signs of heat illness, get to an air-conditioned space and seek medical help if symptoms worsen.
