Phoenix extreme heat warning ends July 10 at 8 p.m.—cooling and trail steps

Phoenix is under an Extreme Heat Warning running from 6:24 p.m. July 9 until 8:00 p.m. July 10 (MST). The City of Phoenix also says its Heat Safety alert is active until Friday, July 10 at 8 p.m.—and on warning days, certain trails close from 8 a.m. to 5 p.m.

What the NWS Extreme Heat Warning means for Phoenix

The National Weather Service warns that dangerously hot conditions can raise heat-risk during the afternoon and early evening. NWS Phoenix guidance emphasizes practice smart heat safety by drinking water and electrolytes and reducing time outside during the afternoons.

City of Phoenix Heat Safety: what’s active

On the City’s heat-safety page, the alert window is listed as active until Friday, July 10 at 8 p.m.. The City also notes that heat-related illness will be possible for people who are sensitive to heat (including the elderly), as well as people spending time outdoors or without effective cooling and/or adequate hydration.

Trail restrictions during the warning (8 a.m. to 5 p.m.)

For public safety on days when the National Weather Service issues an Extreme Heat Warning, the City says certain trails close from 8 a.m. to 5 p.m.—but this does not mean every trail in Phoenix is closed.

Specifically, the City says Camelback Mountain’s Echo and Cholla Trails and all trails associated with Piestewa Peak Trailhead in Phoenix Mountains Preserve and South Mountain Park and Preserve will close during that 8 a.m. to 5 p.m. window.

Where to cool off and get heat relief this week

The City’s July 2026 PAYS newsletter lists these heat-relief options:

• 24-hour respite center: 20 W. Jackson St. (open to the public through Sept. 30)
• Justa Center extended hours: 1001 W. Jefferson St. — 3 p.m. to 9 p.m. daily
• Cholla Library cooling center hours: Mondays through Saturdays until 9 p.m.; Sundays and holidays noon to 9 p.m.

What to do tonight and Friday: quick checklist

• Hydrate: the City says to drink water even when you don’t feel thirsty.
• Plan outdoor time for cooler hours: limit and reduce outdoor activity and take frequent breaks.
• Drink water around activity: the City recommends providing drinking water before, during, and after outdoor activity.
• Skip certain drinks: the City advises avoiding drinks with sugar, alcohol, and caffeine.
• Know heat-exhaustion signs: if you feel faint or dizzy, or if you are pale or your skin is clammy, treat it as a heat warning condition.

Where to find updates

For ongoing City updates related to heat response and services, the Office of Heat Response and Mitigation points residents to Phoenix Weekly Heat Reports. For the weather timing itself, keep an eye on NWS hazard information for the Phoenix area.

Sources

• NWS Phoenix forecast map (Extreme Heat Warning timing)
• City of Phoenix Heat Safety (alert window + trail closures)