Phoenix woke up to a deceptively pleasant start, with clear skies and a cool 64°F at sunrise, but the early calm will not last. The city is on a fast track to serious heat, with sunshine pushing today's high near 91°F and a rapid warm-up driving temps into triple digits later this week.
This Week's Outlook
Temperatures ramp up quickly: Tuesday is expected to top out around 95°F, with Wednesday flirting with or topping 100°F. The core of the heat hits Thursday through Saturday, when highs are forecast in the 103–106°F range. Overnight lows will not bring much relief either, mostly lingering in the mid-to-upper 60s.
An Extreme Heat Watch blankets much of southern Arizona from midweek into the weekend, with some areas under the watch from Wednesday, March 18, and others from Thursday, March 19, through Sunday, March 22, 2026, according to NWS Phoenix.
Heat Risks And Safety
Heat-related illnesses tend to spike during multi-day heat events, and certain groups are hit hardest: older adults, young children, outdoor workers, and people with existing medical conditions. To cut your risk, avoid strenuous activity during the hottest parts of the day, drink water often, and get into air-conditioned or shaded areas whenever you can.
Know the red flags for heat stroke: confusion, fainting, and very high body temperature are all serious warning signs. If you see these symptoms, call 911 immediately.
Cooling Centers And Local Help
The City of Phoenix operates a network of daytime cooling centers, along with some 24/7 respite options, to offer water and a place to cool off. Check locations and hours before heading out, and dial 211 if you need help finding the closest site.
More details and a Heat Relief Network map are available from the City of Phoenix.
Plan Ahead
If you work or play outside, shift heavy activity to early morning or evening and schedule extra rest breaks. Never leave pets or children in parked cars, keep water handy wherever you go, and stay on top of updated forecasts and city resources before you step into the heat.
