National Weather Service United States Department of Commerce
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Last Map Update: Thu, Sep 4, 2025 at 7:42:13 pm MST

Isolated-Scattered thunderstorms are expected at first over prominent terrain features of Southwest AZ and Southeast CA late morning/early afternoon, spreading into the surrounding lower deserts later in the afternoon, then scattered to numerous storms may develop along an outflow boundary that pushes towards the Phoenix Metro Area from a cluster of storms expected to form over southeast AZ. Hi-Res guidance shows the potential for any given storm to quickly drop 1-2" of rain, and if multiple storms move over the same spot, totals could be locally higher.
Due to abundant moisture and cloud cover, temperatures will dip below normal by the end of this week with lower desert highs falling into the 90s with lows in the 70s.
Widely scattered thunderstorms will be possible Thursday afternoon and evening, primarily across south-central AZ, SW AZ and SE CA. Some storms will be capable of producing gusty wind near 35 mph, with higher gusts possible with stronger cells. Patchy to dense blowing dust may also accompany these strong outflow winds.
It was the 5th hottest August on record for Phoenix with an average monthly temperature of 98.2 degrees. Yuma and El Centro both had monthly temperatures that were slightly above average. Rainfall varied across the region with both El Centro and Yuma receiving well above normal rainfall, whereas Phoenix had well below normal rainfall.

 

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