Arizona Weather Alert: Phoenix Faces 103°F Heat and Thunderstorm Threat Wednesday, September 3

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Cloud to Ground Lightning thunderstorm strike on the horizon with clouds
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Phoenix, Ariz. – Arizona residents should brace for another round of extreme late-summer heat mixed with midweek thunderstorms that could disrupt evening commutes. Temperatures will climb near 103°F on Wednesday with scattered storm chances that may reduce visibility and spark power outages across Phoenix.

According to the National Weather Service in Phoenix, thunderstorms may develop after 11 a.m. Wednesday and persist through the night. Gusty winds and brief heavy rain could make driving hazardous, especially along Interstate 10 and Loop 202. Officials urge drivers to slow down and avoid flooded roadways.

Thursday brings another push of triple-digit heat with highs near 99°F, but storm chances increase to 40 percent Thursday night. Isolated downpours could overwhelm storm drains in Glendale and Scottsdale, and minor flash flooding remains possible in low-lying areas. The threat lingers into Friday with storms continuing through the evening.

While weekend conditions trend drier, temperatures stay hot. Highs will remain between 95°F and 100°F through Monday, keeping cooling centers in high demand. Residents should limit outdoor activity during peak afternoon hours and stay hydrated as fall football games and outdoor events face heat-related challenges.

Warnings remain in place through late Friday, and more advisories may be issued if storms intensify.

Five Day Forecast for Phoenix, AZ

  • Wednesday: High 103°F. Storm chance after 11 a.m., gusty winds possible.
  • Thursday: High 99°F. Evening storms increase to 40 percent chance.
  • Friday: High 94°F. Isolated thunderstorms with brief heavy rain.
  • Saturday: High 95°F. Mostly sunny, slight storm chance.
  • Sunday: High 98°F. Sunny, breezy by afternoon.