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Last Map Update: Tue, Jul 21, 2026 at 2:58:44 pm MST

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National Weather Service NWS Flagstaff, AZ

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National Weather Service NWS Tucson Arizona

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Increasing Temperatures This Week

Scattered thunderstorms will develop over the high terrain of southern Gila County this afternoon resulting in locally heavy rainfall and potential flooding. An outflow boundary will descend towards lower elevations in the evening potentially triggering new storms. There is a 10-25% of storms during the evening in the Phoenix Metro. The main concerns from storms will be gusty winds, local blowing dust, and heavy rain.

Thunderstorms will develop this afternoon across Arizona high terrain in southern Gila County. These thunderstorms will be capable of producing locally heavy rainfall and producing flash flooding. A Flood Watch is in effect for much of southern Gila County this afternoon and evening.

Temperatures will continue to increase during the latter half of this week resulting in widespread major to locally extreme HeatRisk. Lower desert high temperatures will reach 105-117 degrees, while lows will be in the upper 80s to middle 90s. An Extreme Heat Warning is in effect for much of southeast California starting Wednesday, then expanding to include much of the Arizona lower deserts Thursday through Monday.

A high pressure center will expand and strengthen later this week leading to warming temperatures across the region. Major HeatRisk will become widespread across the lower deserts late week likely persisting through the weekend. Plan accordingly for dangerously hot temperatures.