Tuesday in Phoenix is already starting out toasty, with partly cloudy skies, morning temperatures in the 80s and a forecast high near 101°F. There is a slight chance of late-night showers and isolated thunderstorms that could deliver brief downpours and gusty outflow winds this evening. After that, a strong ridge is set to build over the Southwest, prompting an Extreme Heat Watch for the lower deserts from this Thursday through Monday (July 23–27). Overnight lows during the peak of this stretch will stay unusually warm, often only dipping into the upper 80s to low 90s.
Late Afternoon Storms, Then Serious Heat
Scattered monsoon showers are still in play today. The valley holds only a slight chance of measurable rain, while stronger storms are expected over higher terrain. Storm outflows may kick up sudden wind shifts and gusts this evening, with the forecast discussion calling for gusts up to 35 to 50 mph in some spots. Any storms that manage to drift into Maricopa County could drop brief heavy rain, but most locations are expected to see little if any accumulation. Where rain does fall, new totals should generally stay under a quarter inch, according to NWS Phoenix.
Heat Outlook This Weekend
Temperatures climb in a hurry. Highs are forecast near 105°F on Wednesday, then ramping up to around 110 to 112°F from Thursday into the weekend, with similar readings likely into early next week. The NWS Phoenix office warns that heat indices, which factor in humidity, could reach 113 to 120°F in parts of the lower deserts, increasing the risk of heat-related illness. Nighttime will not offer much relief, with many urban neighborhoods staying in the upper 80s or low 90s overnight as the ridge strengthens.
Stay Safe and Find Cool Space
Residents are urged to take precautions now. Avoid strenuous outdoor activity during the hottest afternoon hours, drink plenty of water and check on older neighbors, medically vulnerable people and pets. If you do not have air conditioning at home, the Maricopa County Heat Relief Network lists cooling centers, hydration stations and transportation assistance, and you can dial 2-1-1 for immediate help. Employers and outdoor crews should schedule frequent shaded breaks and allow time to cool down. Heat stroke is a medical emergency and requires calling 9-1-1. For cooling center locations and county guidance, visit Maricopa County.
Commute and Event Notes
Tonight's brief storms could slow the evening commute and kick up sudden gusts that reduce visibility, so drivers should allow extra travel time and use caution in any heavy downpours. With highs expected to rise above 110°F later this week, planners may want to push outdoor events into the early morning hours or move them indoors when possible to protect attendees and staff. Keep pets off hot pavement, and remember that metal and plastic surfaces left in the sun can stay dangerously hot.
