Phoenix Punished: Extreme Heat Warning Grips Valley of the Sun as Temps Near 113 Degrees

Phoenix was already around 91°F early Tuesday, with clear skies setting the stage for a dangerous afternoon climb to 112°F. An Extreme Heat Warning covers the metro area through Saturday evening, and overnight lows near 89°F will offer very little relief.

The warning from the National Weather Service Phoenix calls for dangerously hot conditions, with major to extreme heat risk across the lower deserts. Heat index values could reach 111°F, even as afternoon humidity remains unusually low.

Tuesday Through Thursday Stay Brutal

Tuesday will be sunny with a high near 112°F and only a light southwest breeze. Wednesday and Thursday look even hotter, each reaching about 113°F under mostly sunny skies.

After dark, temperatures will fall only into the upper 80s, with lows around 89°F Tuesday and Wednesday night and 90°F Thursday night. Winds generally stay between 0 and 5 mph, so there will be little natural breeze to take the edge off the heat.

This is a substantial extension from last week’s Hoodline forecast, which focused on the first half of the hot stretch. The latest outlook keeps the warning in place through Saturday and pushes the hottest readings toward the middle of the week.

Storm Chances Return This Weekend

Friday will remain mostly sunny with a high near 111°F, but a 30% chance of showers and thunderstorms arrives Friday night. Saturday should reach 109°F, with a slight 20% chance of storms after late morning and a 40% chance Saturday night.

Sunday brings the first meaningful break, with a high near 105°F and a 40% chance of showers and thunderstorms. The forecast calls for mostly cloudy conditions Sunday night, when rainfall could reach a quarter- to half-inch in some spots, followed by a high near 102°F Monday.

Forecasters say storm activity is more likely to favor higher terrain at first, though some storms could reach the lower desert. The rain chances may help, but wet pavement and brief downpours will not erase the heat risk immediately.

Heat Safety Remains The Priority

Anyone working or exercising outside should move strenuous activity to early morning or evening, drink water frequently and take regular breaks in shade or air conditioning. People who become confused, faint or develop signs of heat stroke need immediate medical help—call 911.

Residents who need a cool place, drinking water or transportation assistance can call 2-1-1. Maricopa County heat-relief resources list cooling centers, hydration stations and other help across the Valley.