Monday, July 20, 2026 — Phoenix rolled into the workweek under muggy, mostly cloudy skies, with temperatures headed for the low triple digits and an afternoon high near 104°F. Overnight, the heat will barely let up, with lows stuck in the mid-80s across the lower desert. A small chance of spotty evening thunderstorms could bring brief, localized downpours and gusty outflow winds around the valley.
Afternoon Heat, Evening Storm Chance
The afternoon is expected to turn mostly sunny, with light southwest breezes around 0–10 mph and highs hovering near 104°F. A slight chance of showers and thunderstorms is on tap between roughly 7 p.m. and midnight. Any storms that do pop could produce brief heavy rain, localized street ponding and gusts near 30 mph. Rainfall totals should stay light, although outflow winds from storms over higher terrain could push into the lower deserts and kick up stronger gusts.
What To Expect This Week
Tuesday holds onto the heat with a high near 103°F, then temperatures climb further into the upper 100s and low 110s later in the week, with forecast highs around 109°F on Thursday and near 110–112°F by the weekend. Overnight lows may only slip into the upper 80s to lower 90s, limiting any real overnight relief and increasing heat stress.
The National Weather Service in Phoenix has highlighted areas of Major to Extreme heat risk late this week and notes that an Extreme Heat Watch may be issued. For the most current details, check the latest forecast from NWS Phoenix.
Cooling Centers and Safety
The City of Phoenix is operating cooling centers and hydration stations across the valley, with many locations having opened for the season on May 1 and hours that vary by site. Anyone who is vulnerable to heat should plan ahead to use those resources and confirm current locations and hours on the city’s website: City of Phoenix. Neighbors and employers are encouraged to build in cooling breaks and extra water as temperatures climb later this week.
Plan Ahead
Shift outdoor workouts and yard work to the early morning, drink plenty of water and keep an eye on local forecasts for brief storm-driven gusts this evening. Drivers should slow down if sudden ponding develops during downpours, and event planners will want to account for intense daytime heat and poor overnight recovery when setting schedules from Thursday through the weekend.
