Get to Know Monsoon

Arizona's monsoon starts June 15 and ends September 30, although the seasonable wind shift that brings moisture up from Mexico can start any time from early to mid-summer. Use this page to track our annual rainy season.

 

A high-pressure zone starts it all

Summer rains typically start in late June to early July, when a zone of high atmospheric pressure settles near the intersection of Arizona, Utah, Colorado, and New Mexico. Prevailing westerly winds north of this “Four Corners” high-pressure zone help it spin clockwise, pulling moisture mostly from the Pacific Ocean but also from the Gulf of Mexico north into the western U.S.

Read more in an in-depth look at monsoons [PDF] by Arizona Cooperative Extension Specialist Mike Crimmins, Ph.D.

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