MOST ACCURATE FORECAST: Monsoon storm chances ramping up over the weekend

Posted at 6:08 AM, Jul 22, 2022

PHOENIX — It was a record-setting Friday in the Valley!

We only dropped to 95 degrees in the morning, tying the record warm low temperature set in 2006.

That also tied for the 2nd warmest overnight low ever recorded in Phoenix! The record warmest is 96 degrees set on July 15, 2003.

Now, we have had 11 days with overnight lows in the 90s so far this year. That's already more than last year's 9 days and above the yearly average of 8 days.

Phoenix has also hit 110-degrees or higher 20 times this year so far. The new 30-year average is 21 days per year at 110 or more. That's up from our previous 30-year average of 19 days a year as our climate gets warmer.

Over the weekend, high pressure will move east taking the edge off of our heat. That will also open up a surge of monsoon moisture from the south, ramping up storm chances across our state.

Gusty winds, lightning and heavy downpours will be the main threats with any storms that move through. There's also an increased risk for flash flooding near our wildfire burn scars.

Here in the Valley, storm chances are now up to 50 percent on Sunday, 60 percent Monday and 50 percent again on Tuesday. Some spots could see between a half of an inch and an inch of rain over those 3 days.

As storm chances increase, temperatures will drop dramatically. Expect Valley highs in the upper 90s by Monday and Tuesday.


2022 Rainfall totals:

Sky Harbor Official Rainfall: 0.91" (-2.61" from average)

Valley Average (Phoenix Rainfall Index): 1.21"


Daily rainfall reports from all across the Valley can be found here.


Average Monsoon Rainfall in Phoenix (1981-2010): 2.71" of rain

NEW Average Monsoon Rainfall in Phoenix (1991-2020): 2.43" of rain

Average Yearly Rainfall in Phoenix (1981-2010): 8:03" of rain

NEW Average Yearly Rainfall in Phoenix (1991-2020): 7.22" of rain

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