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Last Map Update: Fri, Aug 28, 2026 at 4:50:26 pm MST

Watches, Warnings & Advisories

National Weather Service NWS Flagstaff, AZ

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National Weather Service NWS Tucson Arizona

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Thunderstorm Outlook Today

More Active Period Ahead

Extreme Heat Warning

Temperature Outlook

Heat Safety

Isolated to widely scattered storms are once again expected this afternoon into early this evening across the higher terrain areas to the north and east of Phoenix as well as southeast AZ. Across the lower deserts of south-central AZ, storm chances this evening are less than 20%, however, there will likely be an outflow that moves through that could create some gusty winds as well as areas of blowing dust. Out west, there is a 10-30% chance of a few strong to severe storms this afternoon across portions of southwest AZ and southeast CA. Right now, based on the latest guidance, the greatest threat areas for storms will be across the Imperial Valley in southeast CA as well as portions of La Paz County in southwest AZ.

A more active weather period is expected Saturday through Monday as increasing moisture and instability, combined with an upper-level disturbance, will result in a greater coverage of showers and storms. The greatest coverage of activity is currently forecast across south-central AZ, with Sunday and Monday appearing to be the most active periods at this time. All thunderstorm hazards are on the table including heavy rainfall leading to localized flash flooding, strong to severe wind gusts, areas of blowing dust, frequent lightning, and even some small hail.

Strong high pressure over the Southwest will lead to abnormally hot temperatures continuing into the weekend with temperatures 5-7°F above normal and near record territory at times. This will result in Major to Extreme HeatRisk across much of the lower deserts. The Extreme Heat Warning remains in effect through Saturday for much of the area.

Strong high pressure will continue over the region over the next couple of days with well-above normal temperatures. The well-above normal temperatures will result in widespread Major to Extreme HeatRisk through Saturday with Extreme Heat Warnings in effect through 8pm MST/PDT Saturday. Temperatures "cool-off" to near to slightly above normal on Sunday and then near to slightly below normal on Monday with decent chances for Phoenix Sky Harbor seeing below normal high temperatures the beginning of next week.

Heat can escalate quickly. Make sure to drink plenty of water and electrolytes and wear loose-fitting light-colored clothes. Stay indoors in air conditioning as much as possible, especially during the afternoons. If you have to be outside take frequent breaks in the shade. Never leave people or pets alone in a closed car. Don't underestimate the heat, it's the deadliest weather hazard.