Phoenix is warming up fast. Before sunrise Friday, temperatures at Sky Harbor were already around 63°F under clear skies and low humidity. The day will stay sunny with a high near 93°F and light south-southeast winds by afternoon, making midday plans feel more like early summer than spring. And that is just the pregame, with forecasters warning that a much stronger heat event is lining up for next week.
When the Heat Peaks
The National Weather Service Phoenix office is calling for highs near 93°F today and low 90s through the weekend. Then things escalate quickly. Forecasts show temperatures could climb toward 97°F on Tuesday, March 17, 2026, crack 100°F by Wednesday, March 18, 2026, and peak near 105°F on Thursday, March 19, 2026, in parts of the lower deserts. In other words, triple digits are about to show up early.
Heat Risk and Nighttime Relief
Overnight lows will hang in the low 60s for much of this stretch, which means limited cooldown after those hot afternoons and higher risk for anyone without reliable air conditioning. Afternoon humidity is expected to drop into the low teens, and winds could gust up to 25–30 mph in some corridors this weekend. That dry, breezy setup raises both heat stress and elevated fire danger. If you or your neighbors depend on AC, be ready for heavy use and check in on older adults, young children, and pets during the hottest parts of the day.
Cooling Centers and Safety
The City of Phoenix has activated its 2026 Heat Response Plan and will run a 24/7 respite site downtown at 20 W. Jackson Street, partnering with the Justa Center at 1001 W. Jefferson St. for extended cooling hours, according to the City of Phoenix. Libraries such as Cholla Library will keep doors open longer, and the city reports extra outreach to seniors and mobile-home communities to help residents find relief. If your home AC is unreliable, use those public options or call 211 for help and the latest on locations and hours.
Planning to catch Spring Training, hit the trails, or tackle yard work? Shift the heavy stuff to early morning or evening, carry plenty of water, and absolutely do not leave people or pets in parked cars. Employers and outdoor crews should stagger tasks and build in cool-down breaks. If anyone starts feeling dizzy, weak, or faint, get to shade or an air-conditioned space and seek medical help right away.
