PHOENIX — The Valley could see at least one more stretch of monsoon storm activity before Arizona’s annual rainy season concludes in two weeks.
The remnants of former Tropical Storm Mario are expected to create cloud coverage and a surge of moisture across the Phoenix area in the coming days.
Thunderstorms could develop as soon as Wednesday night, but the chances are greater on Thursday and Friday.
“Over the weekend, things will start to dry out,” Mark O’Malley, a meteorologist with the National Weather Service in Phoenix, told KTAR News 92.3 FM on Wednesday morning.
How will monsoon storms affect metro Phoenix temperatures
Along with the potential for rain, the Valley monsoon storm activity is expected to bring temporary relief from triple-digit temperatures, with forecast highs in the upper 90s Thursday and Friday.
“It won’t cool down a lot at night, with overnight lows generally in the upper 70s to middle 80s,” O’Malley said.
“By next week, we will start to see significant warming across the area and high temperatures through the … middle of next week will be up between 105 and 110 degrees, which is quite warm for this time of the year.”
When does Phoenix monsoon season end?
Arizona’s annual monsoon season runs from June 15 to Sept. 30.
It’s been one of the drier monsoon seasons in Phoenix, with a total of just 0.68 inches recorded at Sky Harbor International Airport, which the NWS uses for the city’s official records.
If it doesn’t rain again at the airport before October starts, 2025 will go down as Phoenix’s seventh driest monsoon season on record.
Normal Phoenix rainfall at this point of the Phoenix monsoon season is 2.2 inches.
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