Jacksonville Weather Alert: Dangerous Storms and Flash Floods Forecast—See Timing, Maps, and Safety Tips

Jacksonville, Fla. — An Arctic cold front roaring into Northeast Florida is delivering the coldest Jacksonville weather in nearly a decade. The National Weather Service has issued an Extreme Cold Warning and a Freeze Warning through Monday morning, cautioning residents to brace for wind chills in the single digits and overnight lows in the upper teens to mid-20s. What to expect today • Sunday high: 41°F; sunset wind chills near 20°F • Tonight’s low: 23°F; hard freeze likely before dawn Monday • Gusty northwest winds 25–30 mph will make exposed skin feel even colder Safety checklist 1. Drip indoor faucets and wrap outdoor pipes to prevent bursts. 2. Bring pets inside; even a few hours in sub-freezing air can cause hypothermia. 3. Cover delicate plants or move containers into a garage. 4. Use space heaters with a three-foot safety zone and never leave them unattended. Jacksonville 7-day forecast at a glance • Monday: Sunny, high 52°F, morning low 26°F — thaw begins. • Tuesday: Milder, 63°F/34°F; light southwest breeze. • Wednesday: Afternoon clouds, 69°F/46°F; 20% chance of evening showers. • Thursday: Frontal passage drops temps to 57°F/38°F; breezy. • Friday: Rebound to 63°F/38°F under full sun. • Saturday–Sunday: Seasonal and pleasant, mid-60s by day and upper 30s at night. Cold-weather ripple effects • The Donna Marathon Weekend will likely start with race-time temperatures in the upper 20s — one of the chilliest editions on record — so runners should layer technical fabrics and cover extremities. • Coastal waters remain hazardous; small-craft and gale warnings extend at least 20 nm offshore. • Energy demand is spiking; JEA asks customers to lower thermostats two degrees and limit appliance use during the Monday morning peak to avoid rolling outages. When will Jacksonville warm up? A more typical February pattern returns mid-week as high pressure slides offshore, allowing southerly flow to nudge daytime readings back into the mid-60s. Another dry cold front late Thursday temporarily trims temperatures but no additional freezes are forecast. By next weekend, Jacksonville weather looks ideal for outdoor plans, with blue skies and comfortable humidity. Bottom line Tonight’s hard freeze is dangerous but short-lived. Protect people, pets, pipes and plants now, and monitor the latest Jacksonville forecast updates to stay ahead of rapidly changing conditions.