admin Arizona’s monsoon is a seasonal wind shift that pulls moisture into the desert, and it delivers some of the most dramatic weather you’ll ever see.
Updated October 2026. Rules and fees change; confirm with the official source linked in each section.
When
The National Weather Service defines monsoon season as June 15 through September 30. Most storms hit in July and August, often in the late afternoon and evening.
What to expect
- Haboobs: towering walls of dust that can drop visibility to zero in seconds
- Microbursts: sudden, violent downdrafts that topple trees and power poles
- Flash floods: washes and low roads fill fast
- Lightning across the whole sky
- Higher humidity that makes the heat feel worse
Dust storms: Pull Aside, Stay Alive
- If you see a dust storm ahead, don’t drive into it.
- If you’re caught in one, pull as far off the road as you safely can.
- Turn off all lights, including hazards, and take your foot off the brake so others don’t follow your taillights.
- Set the parking brake, stay buckled, and wait it out.
Flash floods: Turn Around, Don’t Drown
Never drive into a flooded road or wash. Very little moving water can sweep a car away. Arizona’s “Stupid Motorist Law” can make drivers who go around barricades pay for their own rescue.
Prep your home
- Clean gutters, scuppers and roof drains
- Trim trees; secure patio furniture and umbrellas
- Check that yard grading sends water away from the foundation
- Keep flashlights and a power-outage plan
- Consider flood insurance (insurance guide)