If you’re rafting when there are monsoons in Grand Canyon, you might experience something incredible

Imagine this: It’s your second day in the canyon and you are overwhelmed by how monumentally tall the walls around you seem to have gotten in such a short time. In the distance you see what appears to be a small sliver of cave and beach (though when you get close you will realize it is actually the enormous Redwall Cavern—large enough for a comfortable game of Frisbee or Wiffle ball). Over your head, dark clouds have been gathering, and as you approach the cavern, they break open and begin to rain. All around you, waterfalls begin to cascade down the sides of the massive Redwall cliffs. This is an experience you won’t soon forget.

For many Arizonans, monsoon season is their absolute favorite time of year. It is a welcome respite from the dry hot summer. It also happens to be one of the most beautiful times to raft through Grand Canyon. During drier times the sun looms overhead, heating everything and washing out the brilliant colors around you. But in the rain, sunlight filters through the clouds and all the colors feel a little richer. Waterfalls appear where there is otherwise only rock. The air around you cools, and everything in the canyon seems to take a big, long drink. 

Monsoons in Grand Canyon

Most of the southwest region, including Arizona, receives over 30% of its annual rainfall during the monsoon season, which tends to fall in July, August, and September. These storms are generally quick, afternoon thunderstorms that occur almost every day throughout the season. If you’ve ever driven over a bridge in Arizona and noticed a sign like “Santa Cruz River,” but wondered where the river was—it was probably waiting for the monsoons to come. 

So what does it mean to experience monsoons on rafting trips in Grand Canyon? The most obvious effect is that the side streams that feed into the Colorado River begin to flow more regularly, depositing more sediment into the main river channel. This brings the river back to its natural, muddy state. 

Some advanced planning can help ensure you have an amazing time, even in the rain. Be sure to pack appropriately. Rain gear is critical this time of year (though we always recommend it to protect against getting soaked in the rapids). It’s also important that you have ways to keep your gear from getting wet and dry clothes to change into. 

Count yourself lucky if you get to experience a monsoon storm and all the changes it brings to the canyon on your rafting trip. And if you happen to see a rim fall, send us a picture!