Phoenix/ Weather & Environment

Phoenix Heat Still Sizzles at 105 as Monsoon Storm Threat Looms Next Week

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Published on September 11, 2026
Phoenix Heat Still Sizzles at 105 as Monsoon Storm Threat Looms Next WeekSource: Google Street View

Phoenix is starting Friday under mostly clear skies and temperatures around 91 degrees, but the Valley will heat up quickly. The high should reach about 105 before easing only slightly later in the afternoon, keeping Phoenix firmly in triple-digit territory.

The National Weather Service forecast calls for sunny skies and south winds of 5 to 10 mph Friday. Rain chances remain low at 8%, although a slight chance of showers and thunderstorms could arrive before 5 a.m. Saturday.

This is a modest step down from Thursday’s hotter forecast, which Hoodline previously reported, but it is hardly a cool-down. Overnight temperatures will only dip to around 85 degrees, offering limited relief before another hot weekend.

Weekend Heat Stays Stubborn

Saturday will be sunny with a high near 103 and light south winds. Saturday night brings a 30% chance of showers and thunderstorms between 11 p.m. and 5 a.m., with a low around 84 and rainfall totals generally below a tenth of an inch.

Sunday will also reach about 103 degrees under mostly sunny skies, with a slight chance of showers and thunderstorms after 5 p.m. The odds increase Monday, when Phoenix is expected to hit 104 and face a 30% chance of afternoon and evening storms.

Storm Chances Build Monday Night

The biggest shift arrives Monday night, when showers and thunderstorms become likely and the rain chance rises to 60%. Gusts could reach 20 mph, rainfall may total between a tenth and quarter of an inch, and the low should fall to around 81 degrees.

Tuesday and Wednesday look closer to seasonal territory, with highs near 100 and 99 degrees, respectively, while storm chances linger. Thursday should remain mostly sunny near 100 degrees with only a slight chance of showers and thunderstorms.

Plan Outdoor Time Early

For Friday and the weekend, the safest bet for outdoor errands and exercise is early morning or after sunset, when temperatures are less punishing. Drink water regularly, take breaks in shade or air conditioning, and remember that lows in the mid-80s can make overnight recovery difficult.