Phoenix woke up partly cloudy and already warm on Wednesday, July 22, 2026, with readings in the mid-80s at area observation sites. That short-lived break is about to vanish, with a major heat surge later this week expected to drive daytime highs well into the triple digits across the Valley.
Heat Warning and Timing
High temperatures are forecast to reach about 103°F on Wednesday, then jump sharply to around 108°F on Thursday, July 23, 2026, with heat index values potentially climbing into the low 110s. The real scorchers arrive Friday and Saturday, when highs are expected to top out near 112 to 113°F. An Extreme Heat Warning from the National Weather Service is in effect from 10 a.m. Thursday, July 23, 2026, through 8 p.m. Monday, July 27, 2026. NWS Phoenix
Where To Find Relief
Maricopa County operates a Heat Relief Network that includes cooling centers, respite sites and hydration stations. Residents can call 2-1-1 for help finding a nearby location or arranging transport. County officials urge people at higher risk, including older adults, young children, those with medical conditions and anyone without reliable air conditioning, to use these cooling options during the warning period. Maricopa County
Practical Advice
Officials recommend limiting strenuous activity to the early morning or evening, drinking plenty of water and never leaving children or pets in parked cars, where temperatures can become deadly within minutes. Overnight lows are expected to hold in the upper 80s to low 90s for much of the stretch, so nighttime relief will be hard to come by. Watch for dizziness, heavy sweating, nausea or confusion, and call 9-1-1 if someone shows signs of heat stroke. Maricopa County
Hoodline covered the season’s early triple-digit swings in a July 1 report, and this update reflects the new warning and the expected intensification later this week. The outlet will continue to track any changes to watches or warnings, and residents are urged to follow local forecasts and county advisories before heading outdoors.
