NWS Tucson Arizona

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Last Map Update: Mon, Aug 4, 2025 at 5:10:15 pm MST

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Extreme Heat Warning

Extreme Heat Risk -Wed & Thu

Extreme Heat Warning

Major HeatRisk Versus Extreme HeatRisk

Much of SE Arizona will be under the highest level of HeatRisk (extreme) Wednesday and Thursday. Take precautions to stay safe in this Extreme Heat.

What is Major vs Extreme HeatRisk? Major HeatRisk means that heat related illnesses affect much of the population, especially for those without effective cooling or hydration with little to no relief from the heat at night. Extreme HeatRisk means that heat related illnesses affect the entire population as the heat is prolonged over a period of time with little to no relief from the heat at night.