Phoenix Starts the Week Cooler but Triple Digit Heat Returns by the Weekend

Phoenix Enjoys a Brief Respite From Extreme Heat

Phoenix is beginning the week on a milder note, with temperatures falling slightly below the seasonal average. After a series of intense heat waves earlier this month, residents are experiencing some relief — but it won’t last for long.

The high-pressure system that previously parked over Arizona, baking the region with triple-digit temperatures, has now shifted eastward. That system is currently fueling a dangerous heat wave across the Midwest and East Coast, while Phoenix momentarily cools down.

Monday Sees Below-Average Temperatures at Sky Harbor

On Monday, the high temperature at Phoenix Sky Harbor International Airport reached 104 degrees, which is a bit below the average for this time of year, typically 106 degrees. It’s a subtle but welcome difference as residents brace for what’s coming next.

Heat Expected to Rise Gradually Throughout the Week

Meteorologists predict a steady warming trend throughout the week. Daytime highs are expected to rise by a few degrees each day, ultimately reaching around 110 degrees by Saturday and Sunday.

Despite the rising temperatures, conditions in the Valley will remain sunny and dry, offering consistent weather through the workweek.

Monsoon Activity Returns to Eastern Arizona

While Phoenix will stay dry, monsoon moisture is beginning to move into parts of eastern Arizona, particularly New Mexico-adjacent areas, starting Tuesday and continuing through the weekend.

Key regions to watch:

The White Mountains will likely see scattered showers and thunderstorms as early as Tuesday morning, with precipitation possibly continuing through the evening commute.

By Wednesday, the Mogollon Rim area, including towns like Payson, could also experience isolated storms, bringing some much-needed rainfall to these elevated regions.

This monsoonal surge brings the potential for brief localized downpours, gusty winds, and occasional lightning, especially in higher elevations.

High Country Weather Outlook

In northern and eastern Arizona’s High Country, wind conditions are expected to lighten throughout the week, with only mild breezes forecasted. Despite the moisture creeping in, temperatures in these areas will remain relatively mild compared to the lower desert regions.

Weekend Outlook for the Valley

Looking ahead to the weekend, residents of Phoenix should prepare for a return to extreme heat, with triple-digit temperatures near 110 degrees. With no significant rain chances in the metro area, it's important to continue practicing heat safety, stay hydrated, and limit outdoor activities during peak heat hours.