Phoenix is staring down an Extreme Heat Warning from 10 a.m. Tuesday, July 7, 2026, through 8 p.m. Thursday, July 9, 2026, with mostly clear skies and daytime highs pushing into the low to mid 110s. Heat index readings will hover near 110, and overnight temperatures will offer only limited relief.
What To Expect This Week
Tuesday and Wednesday stay sunny and brutally hot, with highs near 113°F and heat index values approaching 110 to 111. West to southwest breezes stay mostly light, though they could kick up a bit at times. The warning covers the lower deserts and the central Valley and comes with a major heat risk designation, so heat-related illnesses are expected to climb for anyone spending long stretches outdoors. For the full forecast details and official warning language, see NWS Phoenix.
Nighttime Relief Will Be Limited
Overnight lows are forecast to hang in the upper 80s across the lower deserts and may only drop into the low 90s in central Phoenix. That means homes without air conditioning will not cool off much, even in the middle of the night. The lack of overnight recovery raises the risk of heat exhaustion and heat stroke, particularly for older adults, people who are unhoused and anyone working outside.
Heat Safety And Cooling Centers
If you do not have reliable access to air conditioning, call 2-1-1 or check Maricopa County’s heat relief listings for cooling centers, hydration stations and transportation assistance. Drink water often, skip strenuous outdoor work during the hottest hours, wear lightweight clothing and learn the warning signs of heat illness. If someone shows symptoms or is overcome by the heat, move them into shade or air conditioning and call 911. Location details and hours are available through Maricopa County.
Looking Ahead
There is a slight chance of late-day showers or isolated thunderstorms on Saturday, with better odds Sunday as monsoon moisture increases. Any storms that do form should be brief and produce light rain, but they could still kick up gusty outflow winds. If you have outdoor plans later this weekend, keep tabs on updated forecasts and try to schedule travel or work away from the most punishing hours of the day.
