Phoenix On Burner As Early-Spring Heat Takes Aim At Records

Tuesday, March 10, 2026 — Phoenix gets one last breather this morning with mostly cloudy skies and upper 50s at Sky Harbor, then a bright, dry afternoon that tops out near 78°F with light west winds. Any leftover showers fade through the morning as skies clear. Tonight stays mostly clear with a low around 56°F. Enjoy it while it lasts, because this cool spell wraps up fast and a serious warmup is already queued up.

By midweek a strong ridge of high pressure builds over the Southwest, cranking daytime highs into the 90s and putting record territory in play later in the week, according to the National Weather Service. Forecast guidance points to highs in the low to mid 90s Thursday through Sunday, with readings possibly climbing into the upper 90s and toward 100°F early next week. With almost no rain expected and only light winds, the heat will settle in quickly and stick around.

What To Expect

Temperatures climb steadily: Wednesday should hit around 84°F, Thursday near 92°F, and roughly 94–95°F Friday through Sunday. Monday’s forecast is pushing toward the upper 90s. Overnight lows hang in the upper 50s to low 60s, which means limited cooling after dark. If you are planning a hike, a run or yard work, your safest bets are before 9 a.m. or after sunset.

Heat And Fire Risks

Relative humidity is forecast to drop sharply later this week, with minimum values sinking into the single digits in some lower-elevation neighborhoods and poor overnight recovery that can bump up small-scale fire risk. Afternoon breezes should stay on the lighter side, which should limit widespread critical fire behavior, but it is still smart to skip yard burning and treat grills and outdoor equipment with extra caution. If you need to work outside, take frequent breaks, drink plenty of water and move the heaviest tasks into the cooler hours.

Heat Relief And Safety

The City of Phoenix is rolling out expanded relief options as part of a new heat response plan, according to the City of Phoenix. The 2026 plan keeps a 24/7 respite center open at 20 W. Jackson Street and extends hours at Justa Center at 1001 W. Jefferson St., along with longer library hours at select locations. Check the city’s list before you head out and plan ahead, pre-cool your home if you can, check on neighbors and pets, and move strenuous outdoor plans to the coolest parts of the day.

Plan Ahead

Shift workouts, yard projects and events into the early morning or evening as this heat wave settles in, and carry water whenever you walk out the door. Grabbing shade and air conditioning when you can may be the difference between feeling wiped out and truly overheated. Transit and aviation impacts look minimal, but outdoor workers and vulnerable residents should have a plan for several straight hot afternoons. This page will be updated if heat watches or advisories are issued.