Phoenix faces unusual March heat as planned 24/7 cooling access remains largely seasonal until May 1

Early-season heat arrives before the region’s full heat-relief system is scheduled to begin

Phoenix and much of central and southern Arizona entered a stretch of unusually hot weather in mid-March, with county officials warning that temperatures are expected to run roughly 20–30 degrees Fahrenheit above normal from Thursday, March 19 through Sunday, March 22, 2026. The timing has highlighted a recurring gap in the region’s heat-safety infrastructure: many formal heat-relief resources are organized around a May-to-September season rather than late-winter or early-spring heat events.

Maricopa County’s public heat-relief map, a widely used tool that helps residents locate cooling centers, respite centers and hydration stations, is scheduled to return on May 1, 2026. Until then, the county is directing residents to use year-round public indoor spaces such as libraries and community centers, and to call 2-1-1 for assistance locating services or related support needs.

What the city’s 2026 plan provides, and when it is set to start

The City of Phoenix approved its 2026 Heat Response Plan in late February. The plan includes continued operation of a 24/7 heat respite and navigation center at 20 W. Jackson Street, along with extended-hours and partner-based cooling options in the downtown area. It also expands evening access at a north Phoenix library and adds a partnership aimed at connecting families experiencing homelessness to heat respite and services.

However, the city’s heat response programs and services are scheduled to begin May 1, aligning with the broader regional heat-relief season. That calendar structure can leave residents relying on ad hoc options during early heat spikes, particularly those without reliable access to air-conditioned indoor space.

• A 24/7 respite and navigation center is planned at 20 W. Jackson Street.
• A downtown partner site is planned to offer cooling-center hours in the afternoon and evening.
• Cholla Library is slated for extended hours, including evening service and expanded Sunday/holiday hours.
• City staff training and outreach efforts are funded in part through federal resilience grant funding.

Why March heat can be especially risky

Public safety officials emphasize that early heat can carry added risk because people may not be acclimated, and preparedness behaviors common in summer—carrying water, limiting midday outdoor activity, checking on vulnerable neighbors—may not yet be routine. County guidance during the March event reiterates core precautions: stay in air conditioning as much as possible, drink water before thirst develops, and avoid leaving children or pets in parked vehicles.

Heat relief sites across the region are typically established for the May 1–September 30 period, with additional activation tied to extreme heat events.

What residents can do during the current heat event

With the seasonal map offline until May, residents seeking immediate relief are being encouraged to use public indoor spaces that operate year-round, monitor official heat alerts, and contact 2-1-1 for help identifying nearby options, transportation resources, or other support. The current March heat event has underscored how quickly dangerous conditions can arrive outside the traditional summer window—and the importance of clear, accessible cooling options when they do.