Highlights
- Phoenix reached a high of 103 degrees Sunday, matching the seasonal average for early September.
- Rain chances remain slim through Tuesday before increasing Wednesday with possible thunderstorms.
- The Valley is running below average on monsoon rainfall, with Pacific tropical systems offering potential relief.
Phoenix opened Sunday at lows in the mid to upper 80s and is tracking a high of 103 degrees, matching the seasonal norm for early September, according to AZFamily meteorologist Paul Horton.
Rain chances stay slim through Tuesday. A ridge to the east and tropical moisture developing south of the Valley could shift conditions by midweek. Starting Wednesday, Horton forecasts an increasing chance of showers and passing thunderstorms.
The timing matters: the Valley is running below its monsoon average for the season. Horton noted that tropical systems forming in the Pacific may push enough moisture northward to close the deficit.
Watch for Wednesday as the first meaningful window for rainfall.
Sources
Every factual claim in this article traces to one of the sources below. See how we work for the editorial process.
- AZ Family (3TV/CBS5) retrieved 06/09/2026 15:46
Authored by The Scottsdale Signal. Drafted by AI from primary-source material under our beat-specific editorial guides; reviewed by humans before publish under our five-gate process. Sources retrieved at 06/09/2026 15:46. Every claim traces to a source.
