Highlights
- Phoenix reached 113 degrees Sunday afternoon, one degree below the all-time record of 114 set in 2011.
- A First Alert Day is in effect through Saturday, Aug. 29, with forecast highs between 110 and 114 degrees.
- A 30% chance of thunderstorms late Sunday night could bring gusty winds and blowing dust even where rain doesn't fall.
- Monday morning may start cloudy before clearing to a high of 109, with extreme heat continuing through the following Sunday.
Phoenix hit 113 degrees Sunday afternoon, one degree shy of the 114-degree record set in 2011, as a First Alert Day covering both extreme heat and storm potential remained in effect across the Valley.
AZFamily meteorologist Pete Mangione said scattered showers and thunderstorms persisting across northern and southeastern Arizona could interact with the Valley overnight. Depending on how outflow boundaries from those storms behave, there is a 30% chance of a thunderstorm late Sunday night. Even where rain doesn't reach, gusty winds and blowing dust are possible.
Monday morning may start with lingering clouds before clearing to mostly sunny skies and a high of 109. Extreme heat continues Tuesday through Sunday, with highs forecast between 110 and 114 degrees and minimal rain chances across the lower desert.
The First Alert Day designation for extreme heat remains in place through Saturday, Aug. 29. In the high country, scattered showers and storms continue through Monday before tapering off Tuesday; the White Mountains carry a chance of showers and storms through most of the workweek.
The 113-degree reading was corroborated by 12 News and the National Weather Service Phoenix office. AZFamily said it is monitoring conditions and will update coverage if the 2011 record is tied or broken.
The NWS Phoenix forecast office is the watch to follow for any overnight storm updates.
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 24/08/2026 00:09
- 12News retrieved 24/08/2026 00:09
- weather.gov retrieved 24/08/2026 00:09
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 24/08/2026 00:09. Every claim traces to a source.
