Sunday, March 29, 2026, Phoenix is set for another very warm one, with mostly sunny skies and a forecast high near 97°F. Afternoon readings will climb into the mid to upper 90s across the valley, and overnight lows are expected to linger in the low 70s. If you have outdoor plans, expect the real heat in the midafternoon and keep water and shade close.
Afternoon Peak
Temperatures are expected to top out in the mid to late afternoon, roughly between 2 and 5 p.m., with many thermometers hovering in the mid 90s to around 97°F. Warm nights, with lows only around 71 to 72°F, will offer little overnight relief in the urban core. A modest cooldown is expected by Tuesday, with a more noticeable drop into the mid 80s by Wednesday.
Thunderstorm Risk And Gusty Outflows
Moisture moving up from the south could trigger isolated, high-based showers or a few thunderstorms late Sunday into Monday, mainly south and east of the metro. Most of these are expected to produce little measurable rain. Stronger cells could kick up localized gusts of 35 to 45 mph, and weak outflow boundaries may send gusty winds of 15 to 25 mph into parts of the valley Sunday evening. Most of this guidance comes from the National Weather Service. With a dry boundary layer, much of the precipitation may fall as virga, and any storms that do form could produce erratic outflow winds and dry lightning in higher terrain.
Heat Safety And City Resources
Heat like this can be rough on outdoor workers, pets, and older adults, so take frequent breaks, drink water, and move activities to the morning or evening when you can. The City of Phoenix maintains heat-relief and cooling resources for vulnerable residents; see the City of Phoenix for locations and hours. If you spot downed tree limbs or power issues from gusty winds, report them to local authorities and steer clear of the area until crews arrive.
Looking Ahead
The strong ridge responsible for this stretch of unseasonable warmth is expected to relax by midweek, with highs easing back to the low 90s on Tuesday and into the mid 80s by Wednesday. That pattern shift should lower humidity and trim thunderstorm chances, although the valley will likely stay a few degrees above normal into next weekend.
Plan outdoor chores for the cooler parts of the day and keep an eye on forecasts if you have evening plans, as isolated storm outflow gusts could arrive Sunday night. For the most up-to-date local information, follow the National Weather Service and the City of Phoenix resources linked above.
