Phoenix temps could climb to 115 as extreme heat warning takes effect, NWS says

After a short-lived wave of monsoon activity, it looks like the metro Phoenix area is set to dry out and warm up, according to the National Weather Service.

“By tomorrow, we’re going to be looking at highs warming up to 110 degrees,” NWS meteorologist Isaac Smith told KTAR News 92.3 FM on Wednesday. “Those temperatures are going to continue warming up throughout the weekend, climbing upwards of 115 in some areas.”

Not only that, but an extreme heat warning is set to start at 10 a.m. Thursday and last through 8 p.m. Monday.

“Everyone should always make sure to take the necessary heat safety precautions, so if you’re going to be out this weekend, planning to be out and about, make sure you’re taking plenty of breaks, staying cool and staying hydrated,” Smith said.

As monsoon storms briefly disappear late this week, the heat will quickly build. Hot and humid (for Arizona) conditions are expected through at least the weekend with Extreme Heat Warnings in place. Expect highs peaking Fri-Sun between 112-117°F with lows 88-95°F. #azwx #cawx pic.twitter.com/xiLLF5bFvQ

— NWS Phoenix (@NWSPhoenix) July 22, 2026

However, the monsoon season will last through Sept. 30, so umbrellas shouldn’t be put away just yet.

“Areas across the state have already been seeing some pretty good monsoonal weather, some pretty good rainfall amounts,” Isaac said. “Looking at the outlooks going forward, there are still indications that we’ll see wetter-than-normal conditions during the monsoon season.”

But sunscreen and water bottles should be kept handy ahead of the Valley-wide warmup.

How does the extreme heat warning impact metro Phoenix residents?

Extreme heat warnings trigger daytime closures of hiking trails at Camelback Mountain, Piestewa Peak and South Mountain in Phoenix.

Reprieve is available. The Salvation Army opens 10 heat relief stations across the Valley during extreme heat warnings.

Additionally, the Maricopa County Heat Relief Network offers free, cool spaces and other resources to those who need relief from the heat from May to September.

KTAR News 92.3 FM’s John Roller contributed to this report.

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