Highlights
- Phoenix has received 1.41 inches of rain this monsoon season, about a half-inch below average.
- Storm chances increase through Wednesday before drier air pushes in Thursday and Friday.
- Temperatures are expected to climb back to 105 degrees by the end of the workweek.
- Sunday's high reached around 102 degrees, consistent with the seasonal average for mid-September.
Phoenix enters the final stretch of monsoon season running short on rainfall, with 1.41 inches recorded so far, about a half-inch below average, as a fresh round of monsoonal moisture is set to push into Arizona starting Monday, according to AZFamily meteorologist Brian Petersheim.
Sunday brought a relatively mild start, with overnight lows in the mid to upper 80s and a high near 102 degrees, which Petersheim noted is the seasonal average for this time of year. Sunshine dominated the day before the pattern shifts.
Monday and Tuesday carry a slight chance of thunderstorms as moisture builds. Wednesday offers the best storm opportunity of the stretch. The National Weather Service Phoenix office has also flagged an unsettled pattern next week as a factor in potential activity off higher terrain, according to its forecast page.
The window closes quickly. By Thursday, drier air moves in and temperatures begin climbing, with a high of 105 degrees expected through the end of the workweek.
Watch Wednesday for peak storm activity; if the moisture underperforms, the monsoon deficit will likely carry into the season's final weeks.
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 13/09/2026 16:09
- weather.gov retrieved 13/09/2026 16:09
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 13/09/2026 16:09. Every claim traces to a source.
