Highlights
- The National Weather Service issued an Extreme Heat Watch for Maricopa and Pinal counties covering Monday through Thursday next week.
- Phoenix highs are forecast to hover around 111 degrees, roughly six degrees above average, with lows remaining in the 90s.
- The watch could be upgraded to a warning, which would trigger closures of popular Phoenix hiking trails.
- FOX 10 Phoenix is also tracking the excessive heat return early next week, corroborating the forecast.
An Extreme Heat Watch is in effect for Maricopa and Pinal counties next Monday through Thursday, issued by the National Weather Service, as Phoenix temperatures are expected to climb to around 111 degrees, about six degrees above average for mid-August, AZFamily meteorologist Holly Bock reported Friday. FOX 10 Phoenix is also tracking the excessive heat return early next week.
AZFamily has issued First Alert Weather Days for Monday through Thursday. Temperatures in Phoenix are expected to reach approximately 105 degrees Saturday and 108 degrees Sunday before jumping above 110 next week. Overnight lows are forecast to stay in the 90s. A ridge of high pressure building over the region will drive the warming trend and keep conditions mostly dry.
Could the watch become a warning?
Bock reports the Extreme Heat Watch will likely be upgraded to a warning as the week approaches. If that happens, some popular hiking trails in Phoenix would close. Temperatures could remain above 110 through the end of next week, though that depends on whether any monsoon showers move into the Valley.
The National Weather Service Phoenix forecast office notes the subtropical high pressure is expected to migrate from the Southeast back to the Desert Southwest early next week, resulting in hotter temperatures with little moisture. Monitor the AZFamily First Alert Weather App for watch-to-warning upgrades.
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 15/08/2026 04:45
- Fox 10 Phoenix retrieved 15/08/2026 04:45
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 15/08/2026 04:45. Every claim traces to a source.
