National Weather Service United States Department of Commerce
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Last Map Update: Fri, Sep 11, 2026 at 10:18:25 am MST

Localized Major HeatRisk remains over portions of southeast California and along the lower Colorado River Valley today. High temperatures will reach 4-7 degrees above normal, while lows will be 5-10 degrees above normal. Therefore, the Extreme Heat Warning remains in effect for this area through 8 PM MST/PDT this evening.
Above normal temperatures late this week with locally Major HeatRisk will start to gradually cool this weekend through early next week. Thunderstorms will continue to struggle off the higher terrain through the weekend, but better moisture over South-Central AZ and an unsettled pattern next week could result in a few active days with severe weather potential. Stay tuned as details become more clear over the next few days.
Thunderstorm chances will remain low across the bulk of the area with storms focused across the higher terrain areas of eastern Arizona. Although moisture levels increase and support a slightly better chance of rain across south-central Arizona, chances for storms surviving into lower elevations is around 20% or less. Gusty winds and blowing dust will be the greatest weather hazards. Conditions become more favorable for storms over the lower deserts of South-Central AZ by the start of next week.
Temperatures will be above normal through the week, and peak around 5-10° above normal during the middle of the workweek. These temperatures will result in widespread Moderate to Major HeatRisk. An Extreme Heat Warning is also in effect for portions of the lower deserts from Tuesday-Friday. Make sure to practice smart heat safety this week.

 

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