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MOST ACCURATE FORECAST: Monsoon storm chances ramping up this week

Monsoon storm chances will increase throughout the week and temperatures will fall as well as more moisture comes into Arizona later this week.

Monsoon storm chances ramp up, temperatures fall later this week!

By: Ashlee DeMartino

Posted

and last updated

PHOENIX — After the fifth hottest August of record, September 2025 is rolling in with temperatures well above normal. You guessed it, our summer heat isn't going anywhere.

Expect highs in the Valley between 103-106 degrees for Tuesday with mostly sunny skies.

Air quality will also be a concern, with elevated afternoon ozone levels. An Ozone High Pollution Advisory is in effect tonight and tomorrow.

Breathing in ozone pollution can cause chest pain, coughing, throat irritation, congestion, and difficulty breathing. Children, older adults, and those with respiratory conditions such as asthma, bronchitis, or COPD are especially at risk. To stay safe, limit time outdoors during the afternoon peak.

Everyone can help reduce ozone pollution by carpooling, using public transportation, working from home, avoiding long drive-thru lines, and waiting until after dark to refuel gas-powered vehicles.

Monsoon moisture is set to return, this week.

Isolated storms are possible along the Mogollon Rim and in southeastern Arizona through Tuesday, with slight storm chances in the Valley tonight and Tuesday.

By midweek, deeper monsoon moisture and a potential surge from a tropical system in the Pacific could increase storm chances in the Valley for the second half of the week.

Stay tuned for further updates as we get closer.