Friday morning in Phoenix started out deceptively pleasant, with clear skies, dry air, and temperatures around 72F at Sky Harbor. That calm is on borrowed time. Forecasters say the city is headed straight back into triple digits this weekend, with the most dangerous stretch lining up from Sunday into Monday.
Heat Peaks Sunday–Monday
An Extreme Heat Watch is posted for the Phoenix metro from Sunday morning, May 10, through Monday evening, May 11, with the hottest readings expected Monday. Highs across the lower deserts are forecast to hit 104110F, while Phoenix itself is likely to see afternoon temperatures land near 106108F on Monday. Overnight temperatures will only ease off a bit in many neighborhoods, so the main threat will come from the intense daytime heat, according to NWS Phoenix.
Heat Relief Network
Maricopa County’s Heat Relief Network, which opened May 1, is up and running with cooling centers, hydration stations, and respite sites across the Valley. Residents can call 211 or use the county’s interactive map to track down nearby locations. The program operates through the hot season, and partners have extended hours this year, with some overnight sites available. For anyone without reliable air conditioning or for people you’re checking in on, these resources are the first line of defense, per Maricopa County.
Today And This Weekend
Friday stays sunny with a high near 101F and light south winds, while Saturday is expected to top out near 103F. Sunday bumps temperatures into the mid104s ahead of Monday’s peak, with essentially zero chance of rain. Afternoon breezes may gust around 20 mph at times, and overnight relative humidity will be very low, with minimum values generally in the single digits to low teens. That combo creates elevated fire weather concerns in the late afternoon, according to NWS Phoenix.
How To Stay Safe
Skip strenuous outdoor work during the hottest hours, drink water regularly, and keep an eye on older neighbors or anyone without AC. Never leave children or pets in parked cars. Heat stroke is a medical emergency, so call 911 if someone becomes confused, faints, or stops sweating. Employers and event planners should shift heavy tasks to early mornings or evenings and build in frequent rest breaks for anyone working outside.
