Phoenix woke up in full preheat mode Monday morning, June 15, 2026, with temperatures already in the low to mid 80s and climbing. Forecasts call for a high near 108 F this afternoon, with little relief after sunset as lows hang in the mid 80s across much of the Valley.
Afternoon Storms Possible
A slight chance of showers and thunderstorms develops after about 3 p.m. Monday, with the best odds over the foothills and higher terrain, though a few isolated cells could drift into the lower desert. The official start of the monsoon season on Monday has nudged humidity upward and is helping to fuel that shower chance. According to the NWS Phoenix, storms could bring lightning, brief heavy downpours and gusty, erratic winds, with gusts of 35+ mph possible near stronger cells.
Heat Risk And Relief
Temperatures will run several degrees above normal through midweek, producing a widespread Moderate Heat Risk and isolated pockets of Major Heat Risk, with highs in the mid to upper 100s (roughly 105 to 109 F). Overnight lows in the 80s mean limited nighttime relief for anyone without reliable air conditioning. If you need a cool spot, the City of Phoenix Heat Relief Network lists cooling centers, hydration stations and other resources across the Valley.
What To Do Today
Try to limit strenuous activity during the peak heating hours and carry water if you have to be outside. Check on elderly neighbors, people with health conditions and pets. If a storm approaches, move indoors; gusty outflows can produce sudden wind, blowing dust and brief reductions in visibility near stronger storms.
Looking Ahead
The heat holds on into Tuesday and Wednesday, with forecast highs near 109 F Tuesday and about 108 F Wednesday. A shift toward drier air late in the week should bring slightly cooler daytime readings. The cooldown will not be dramatic, but it should ease the worst of the overnight stickiness by the weekend.
