Overview

• A June 1 storm set early-season records by dumping 2.36 inches in El Mirage and over 0.3 inches at Sky Harbor, with most of metro Phoenix receiving at least a quarter-inch of rain.
• The unexpected downpour knocked out power for more than 4,000 Arizona Public Service customers and led to temporary freeway closures as standing water accumulated.
• The weather system is shifting northward, bringing additional showers and cooler temperatures to northern Arizona locations such as Flagstaff and the Grand Canyon through midweek.
• Arizona’s monsoon officially runs from June 15 to September 30, powered by a high-pressure ridge that pulls moisture from the Gulf of California and eastern Pacific.
• The National Weather Service assigns Phoenix roughly a 40% chance of above-normal monsoon rainfall, offering hope after 2023’s driest season on record.