Jacksonville Weather: Storms Linger Today, Sept. 21, 2026

Jacksonville residents can expect continued unsettled weather with showers and thunderstorms forecast for today, Sept. 21, 2026. The First Alert Weather Team reports a warm and humid morning, with temperatures already in the high 70s to near 80 degrees.

Showers and storms offshore are expected to move inland later this morning, potentially bringing pockets of heavy rain from Atlantic Beach to Ponte Vedra. The highest likelihood of showers and thunderstorms is from midday through the evening, with systems generally moving west and southwest across the city.

Potential storm hazards include brief heavy rain, frequent lightning, gusty winds and isolated small hail. This pattern suggests more storms are likely over the next few days, interspersed with dry periods.

A cold front is anticipated to move through the region by Thursday, Sept. 25, 2026, bringing a noticeable drop in temperatures and humidity. Rain chances should decrease by next weekend.

The forecast for the upcoming week:

• Today (Sunday): Partly cloudy and humid with scattered heavy showers and storms. High: 87. Low: 71.
• Monday: Scattered morning coastal showers, partly cloudy with afternoon storms. High: 87. Low: 71.
• Tuesday: Morning coastal showers and afternoon storms. High: 87. Low: 74.
• Wednesday: Partly cloudy and hot with scattered storms. High: 89. Low: 73.
• Thursday: Partly cloudy and breezy with an isolated shower. High: 87. Low: 72.
• Friday: Partly cloudy, less humid, and breezy with an isolated morning shower. High: 83. Low: 70.
• Saturday: Partly to mostly sunny and pleasant. High: 85. Low: 66.

In other weather news, Tropical Storm Fay has formed in the eastern Atlantic but poses no threat to the U.S.