Highlights
- Phoenix is under a First Alert Weather Day Saturday due to heat, with temperatures starting in the lower 90s.
- A high-pressure ridge sliding east will draw monsoonal moisture into the Valley, producing storm chances Sunday and Monday.
- Sunday's high will be near average; Monday's high is forecast around 102 degrees.
- Drier air returns Tuesday through Friday, with highs expected to stay below 110 degrees through the workweek.
Phoenix enters Saturday with temperatures already in the lower 90s and one more First Alert Weather Day in effect for heat, according to AZFamily meteorologist Paul Horton. The relief comes with a trade-off: storm chances arrive this weekend.
The high-pressure ridge responsible for the recent heat is shifting east, and that movement will pull monsoonal moisture up from the south. Sunday and Monday carry First Alert Weather Days, this time flagged for storm potential rather than heat. Cloud cover and storm activity will push Sunday's high to near-average levels; Monday's forecast high sits around 102 degrees, Horton reported.
The National Weather Service Phoenix office confirmed an Extreme Heat Warning remained in effect through Saturday for much of the area, consistent with the heat pattern Horton described. The forecast shift is also corroborated by AZCentral and Fox 10 Phoenix, both of which reported increasing storm chances following the extreme heat stretch.
Drier air is expected to push back in Tuesday through Friday, with temperatures gradually climbing again. Highs are forecast to stay below 110 degrees through the workweek.
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 29/08/2026 15:51
- weather.gov retrieved 29/08/2026 15:51
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 29/08/2026 15:51. Every claim traces to a source.
