Highlights
- Wednesday and Thursday are both First Alert Weather Days, with highs of 107 and 109 degrees respectively.
- Thunderstorm chances reach 30 percent Friday evening and overnight, with similar odds Saturday night.
- Weekend highs near 104 degrees Saturday and Sunday offer partial relief before temperatures drop closer to 100 next week.
Phoenix is forecast to hit 109 degrees Thursday, the peak of a two-day First Alert Weather stretch driven by a Gulf moisture surge that kept overnight lows in the upper 80s to low 90s Wednesday morning, according to Arizona's Family meteorologist April Warnecke. Wednesday's high is expected to reach 107 degrees under mostly sunny skies.
The heat spike is corroborated by a National Weather Service Extreme Heat Warning covering portions of the lower deserts through Thursday, noted on the NWS Phoenix forecast page, and confirmed by 12News, which reported officials urging caution during the warning period.
Relief arrives in stages. A slim chance of showers Wednesday night gives way to isolated thunderstorms Thursday night, with storm chances climbing to about 30 percent Friday evening and overnight. Saturday carries similar 30 percent odds. Weekend afternoon highs are expected to settle near 104 degrees both Saturday and Sunday, closer to seasonal norms. Sunday is forecast to be dry.
The first half of next week brings rain chances near 30 percent again, with temperatures expected to hover near 100 degrees.
The NWS Phoenix office advises practicing heat safety through the warning period, which runs through Friday.
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 09/09/2026 13:24
- weather.gov retrieved 09/09/2026 13:24
- 12News retrieved 09/09/2026 13:24
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 09/09/2026 13:24. Every claim traces to a source.
