Extreme Heat Watch

Locations Affected

Tucson, AZ ∙ Comobabi, AZ ∙ Drexel Heights, AZ ∙ Patagonia, AZ ∙ Tombstone, AZ ∙ Wahak Hotrontk, AZ ∙ Eloy, AZ ∙ Oro Valley, AZ ∙ San Manuel, AZ ∙ Thatcher, AZ

Full Alert Message

URGENT - WEATHER MESSAGE National Weather Service Tucson AZ 103 AM MST Mon Aug 18 2025 ...EXTREME HEAT WATCH REMAINS IN EFFECT FROM WEDNESDAY MORNING THROUGH FRIDAY EVENING... * WHAT...Dangerously hot conditions with temperatures ranging from 105 to 110 across much of Pima and southeastern Pinal counties leading to widespread Major HeatRisk with localized Extreme HeatRisk. In other areas of southeastern Arizona, high temperatures will range from 100 to 105 degrees leading to widespread Major HeatRisk. * WHERE...South Central Pinal County, Southeast Pinal County, Tohono O'odham Nation, Tucson Metro Area, Upper Gila River Valley, Upper San Pedro River Valley, Upper Santa Cruz River Valley/Altar Valley, and Western Pima County. * WHEN...From Wednesday morning through Friday evening. * IMPACTS...Heat related illnesses increase significantly during extreme heat events. * ADDITIONAL DETAILS...Major HeatRisk is when heat will affect anyone without cooling or hydration and will affect health systems and industries. Additionally, Extreme HeatRisk is rare and long-duration extreme heat with no overnight relief. PRECAUTIONARY/PREPAREDNESS ACTIONS... Do not leave young children and pets in unattended vehicles. Car interiors will reach lethal temperatures in a matter of minutes. Take extra precautions if you work or spend time outside. When possible, reschedule strenuous activities to early morning or evening. Know the signs and symptoms of heat exhaustion and heat stroke. Wear lightweight and loose fitting clothing when possible and drink plenty of water. To reduce risk during outdoor work, the Occupational Safety and Health Administration recommends scheduling frequent rest breaks in shaded or air conditioned environments. Anyone overcome by heat should be moved to a cool and shaded location. Heat stroke is an emergency! Call 9 1 1.

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