Highlights
- Phoenix hit 111 degrees Sunday before an Extreme Heat Warning expired at 8 p.m.
- Monsoon storms Sunday evening downed power lines and caused outages across the Phoenix area.
- Highs drop to 100 degrees by Thursday, with storm chances each night through Wednesday.
- A Flood Watch is in effect Monday afternoon through evening for southern Arizona, including Tucson.
Phoenix reached 111 degrees Sunday afternoon before the Extreme Heat Warning expired at 8 p.m., according to Arizona's Family meteorologist Pete Mangione. Showers and thunderstorms developed across the Phoenix area Sunday evening, downing power lines and triggering outages.
The National Weather Service Phoenix office confirmed the cooling trend, with deeper monsoon moisture driving broader storm chances through midweek.
Monday brings a high around 108 degrees and a 30% chance of scattered showers and thunderstorms Monday night into early Tuesday. Tuesday's afternoon high drops to around 104 degrees, with a 20% storm chance Tuesday night into Wednesday morning. Wednesday cools further to a high of 101 degrees and carries a 30% chance of showers and thunderstorms Wednesday evening. Thursday may reach only 100 degrees, with a slight chance of an afternoon or evening storm.
Friday looks relatively mild by Phoenix standards, with a high around 103 degrees. Temperatures climb again next weekend, with highs ranging from 106 to 108 degrees.
A Flood Watch is in effect from Monday afternoon through Monday evening for southern Arizona, including Tucson. Isolated showers and thunderstorms will continue Sunday evening across the high country of northern and eastern Arizona, with more widespread activity expected Monday through Thursday.
What should Phoenix-area residents watch for this week?
The primary risk shifts from extreme heat to flash flooding and storm damage through Wednesday. Monsoon moisture increases each day, raising the chance of widespread thunderstorm activity, downed power lines, and localized flooding, particularly in low-lying and desert wash areas.
The NWS Phoenix office is the authoritative source for updated alerts; the Flood Watch for southern Arizona runs through Monday evening.
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 10/08/2026 06:15
- weather.gov retrieved 10/08/2026 06:15
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 10/08/2026 06:15. Every claim traces to a source.
