NWS Tucson Arizona

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Last Map Update: Sun, Aug 3, 2025 at 2:08:18 am MST

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Extreme Heat Warning

Extreme Heat Warning and Extreme Heat Watch

Major HeatRisk Versus Extreme HeatRisk

Extreme Heat Warning has been extended from today through Tuesday with hot temps up to 110°F and major HeatRisk expected. An Extreme Heat Watch has been issued for Wednesday through Friday with very hot temps up to 115°F and major to extreme HeatRisk possible.

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.