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When is monsoon season going to start?

Higher humidity, thunderstorms, heavy rain, lightning, hail, high winds, dust storms and extreme heat are all part of monsoon season. Here's how to prepare for it.

PHOENIX — Monsoon season will be here before we know it, so let's break down what's coming.

Monsoon season in Arizona begins in June and continues through September. With this season comes higher humidity, which can lead to thunderstorms, heavy rain, lightning, hail, high winds, flash flooding, dust storms and extreme heat, the Arizona Department of Transportation said.

Last year's monsoon season was drier than normal and much drier than the monsoon seasons in 2021 and 2022, according to the National Weather Service. Central and southern Arizona experienced 50% or less of normal precipitation in 2023, but western Arizona experienced above-normal precipitation because of a combination of rainfall from Tropical Storm Hilary. 

During monsoon season, ADOT urges drivers to be prepared for summer storms. A few tips ADOT has for drivers are:

  • Expect the unexpected: have extra supplies, a fully charged cellphone, drinking water and an emergency kit in case you experience an extended highway closure.
  • When in doubt, wait it out. If you see a dust storm or heavy rain, ADOT said it's best to exit and wait for the storm to move through the area.
  • Don't risk crossing a flooded wash, even if it doesn't look deep, ADOT said. Even a few inches of water can be dangerous. 
  • Storm runoff can loosen boulders or rocks on slopes above highways. ADOT tells drivers to stay alert in areas prone to falling rocks.  

Arizona isn't exactly known for rainfall, but during monsoon season, thunderstorms and sudden, heavy rainfall can occur. Here are some tips to keep in mind:

  • Before you drive, inspect your windshield wipers and replace them if necessary.
  • Avoid sudden braking, which can cause your car to slide on the wet pavement. 
  • Create a "space cushion" between you and other drivers. 
  • Turn on your headlights while driving. 

Another hazard of heavy rain? Hydroplaning. 

Hydroplaning occurs when a thin layer of water accumulates between your tires and the asphalt and your car loses contact with the road. If you are hydroplaning, ease your foot off the gas pedal until you regain traction, ADOT said. If you are sliding or drifting, turn your steering wheel into the direction you're sliding.  

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Arizona Weather 

Arizona has seen its fair share of severe weather. Here is a compilation of videos from various storms across the Grand Canyon state.

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