Name: Heat in Arizona, September 5 to 8, 2025
Start: 2025-09-05T10:00
End: 2025-09-08T20:00
Location: Arizona

Where it happened

Every event with a place to put it; 3 filed by county or forecast zone are drawn at its center, in a lighter ring. Tap one for its entry below.

Tornadoes
Tropical storms and surge
Floods
Wind
Hail
Winter weather
Heat and drought
Cold
Fire, smoke and dust
Marine and coastal
Other

Open the live radar over this ground

The toll

Deaths: 4
Injuries: 0
Property damage: None recorded
Crop damage: None recorded
Events: 3

Deaths and injuries are direct and indirect together, as the offices filed them. Damage is property and crops in the dollars of the year, not adjusted for inflation, and only where an office estimated it.

What happened

The episode as NWS TWC wrote it up.

Temperatures in Southeastern Arizona were wide ranging from 6 degrees below normal to 6 degrees above normal with Low HeatRisk. The Pima County Medical Examiner found that heat was a contributing factor in the cause of death for 4 individuals.

What forecasters said that day

The local office's own words before the first event, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Tucson, AZ wrote its last area forecast discussion before the first event at Sep 5, 8:03 AM MST, 1 hour 57 minutes earlier.

Area forecast discussion, Sep 5, 8:03 AM MST, 1 hour 57 minutes before

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The radar

The national radar mosaic for the moment the first event began.

Open the radar archive at this moment

Event by event

3 heat. Local standard time, as filed.

Heat, Tucson Metro Area

When: September 5, 10:00 AM MST to 8:00 PM MST
Where: Tucson Metro Area forecast zone
Deaths: 0 direct, 1 indirect
Reported by: County Official
Coordinates: 32.097, -111.790 (the zone’s center; the record gives no point)

High temperatures in Southeastern Arizona were 6 degrees below normal, causing Low HeatRisk. The Tucson International Airport reached a high temperature of 91 degrees Fahrenheit. The Pima County Medical Examiner found that heat was a contributing factor in the cause of death for an individual in Tucson.

Heat, Tucson Metro Area

When: September 8, 10:00 AM MST to 8:00 PM MST
Where: Tucson Metro Area forecast zone
Deaths: 0 direct, 2 indirect
Reported by: County Official
Coordinates: 32.097, -111.790 (the zone’s center; the record gives no point)

High temperatures in Southeastern Arizona were 6 degrees above normal, causing Low HeatRisk. The Tucson International Airport reached a high temperature of 103 degrees Fahrenheit. The Pima County Medical Examiner found that heat was a contributing factor in the cause of death for two individuals in Tucson.

Heat, Tohono O Odham Nation

When: September 8, 10:00 AM MST to 8:00 PM MST
Where: Tohono O Odham Nation forecast zone
Deaths: 1 direct, 0 indirect
Reported by: County Official
Coordinates: 32.501, -111.567 (the zone’s center; the record gives no point)

High temperatures in Southeastern Arizona were 4 degrees above normal, causing Low HeatRisk. The Sells RAWS reached a high temperature of 100 degrees Fahrenheit. The Pima County Medical Examiner found that heat was a contributing factor in the cause of death for an individual in Sells.

The people who died

As the offices recorded each death: direct deaths were caused by the weather itself, indirect ones by something it set in motion.

Event	Date	Age	Sex	Where	Kind
Heat, Tucson Metro Area	2025-09-05	56	Male	Mobile/Trailer Home	Indirect
Heat, Tucson Metro Area	2025-09-08	44	Male	Outside/Open Areas	Indirect
Heat, Tucson Metro Area	2025-09-08	61	Female	Outside/Open Areas	Indirect
Heat, Tohono O Odham Nation	2025-09-08	58	Male	Outside/Open Areas	Direct

What these are

Heat: Heat below excessive heat criteria that still caused deaths, injuries or significant impacts.

After NWS Directive 10-1605, the rules offices file Storm Data by.

The same day elsewhere

More

Every storm in Arizona in 2025 Every state in 2025 This day in weather history Warnings in Arizona, September 2025

Sources

NOAA National Centers for Environmental Information, Storm Events Database, compiled from the National Weather Service’s monthly Storm Data. Complete through 2026-06; NCEI adds each month about 75 days after it ends and revises past years a few times a year. Rebuilt 2026-09-24. Each event’s entry at NCEI: 1293512, 1293513, 1293514.