Phoenix skies are mostly clear Sunday morning, and the city is already warming its way back to the triple digits. Temperatures are starting out around 75°F, with a daytime high near 106°F expected today and an even hotter Monday that could reach about 108 to 110°F. An Extreme Heat Warning covers the Valley from 10 a.m. Sunday through 8 p.m. Tuesday (MST), and officials say the risk of heat-related illness will be highest from late morning into the afternoon hours.
What To Expect
Overnight will not bring much relief, with lows stuck in the mid-70s, so the Valley will not cool down much between days. Afternoon relative humidity will drop into the single digits, keeping the air very dry even as temperatures climb. Monday is expected to be the peak of this heat event, with lower-desert highs near 110°F, according to NWS Phoenix.
Afternoon Winds And Fire Risk
Winds stay on the lighter side through much of Sunday, but breezier conditions return Monday and Tuesday, with easterly winds around 5 to 10 mph and gusts up to about 20 mph in metro Phoenix. Stronger gusts of 25 to 30 mph are possible farther west along the Lower Colorado River Valley on Tuesday, and the AFD notes that very low humidity combined with those gusty afternoons will create elevated fire-weather concerns. If you work outside, shift the heaviest tasks to early morning or evening, take frequent water breaks, and watch closely for signs of heat illness.
Where To Find Cooling
If you need a cool place to ride out the worst of the heat, call 2-1-1 for help with transportation or use the regional Heat Relief Network map to locate cooling centers, hydration stations, and respite sites around the Valley. Many local agencies have opened dozens of HRN sites for the 2026 season, so follow posted hours and any site instructions when you arrive. For life-threatening heat symptoms, including confusion, fainting, or a very high body temperature, call 9-1-1 right away.
