Overview
- Forecasters say the heat is building this week and will push daytime highs into the 110–115°F range in the Phoenix metro by midweek, with the hottest readings expected Wednesday and Thursday.
- The National Weather Service has issued an Extreme Heat Warning for lower elevations of the Grand Canyon and an Extreme Heat Watch that takes effect Tuesday and expands to the Phoenix area on Wednesday.
- Winds will strengthen through the work week with valley gusts forecast near 20–30+ mph and winds over higher terrain potentially topping 40 mph by Friday, raising fire and outdoor-safety concerns.
- State and local agencies have activated Weather Action Days and urged standard heat-safety steps such as staying hydrated, using air conditioning or cooling centers, limiting activity during peak heat hours, and checking on vulnerable people.
- The heat arrives against a drier-than-normal start to the monsoon season at Sky Harbor, and forecasters warn that any late-week moisture could bring scattered storms mainly to northern and eastern high country rather than relieving valley heat.