Arizona Power Outage Season
When outages happen most in Arizona, and what to expect.
July is historically Arizona's busiest month for recorded power outages, part of a summer season (June–August) that accounts for about 37% of all recorded outages statewide, averaging 2.5 hours per event.
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Arizona outages by month
Total recorded events and average duration per event, summed across every tracked county in Arizona.
Peak season insight
Arizona's outage season runs June–August, accounting for 37% of all recorded outages. July has the highest frequency.
Month-by-month data table
| Month | Events | Avg duration |
|---|---|---|
| January | 1,042 | 2.3 hrs |
| February | 915 | 2.7 hrs |
| March | 1,091 | 2.3 hrs |
| April | 1,129 | 2.1 hrs |
| May | 1,391 | 6.9 hrs |
| June | 1,799 | 2.2 hrs |
| July | 2,257 | 2.0 hrs |
| August | 2,074 | 2.0 hrs |
| September | 1,364 | 2.9 hrs |
| October | 1,346 | 1.9 hrs |
| November | 1,002 | 3.1 hrs |
| December | 1,032 | 3.2 hrs |
This month in Arizona
October has historically recorded 1,346 outage events across Arizona, below the state's typical monthly average. Outages that start in October have averaged 1.9 hours.
Main causes by season
Named storms behind Arizona's worst recorded outages, from the NOAA Storm Events Database.
Winter (December–February)
- Winter Weather
- Winter Storm
- Heavy Snow
- Heavy Rain
- Drought
Spring (March–May)
- High Wind
- Drought
Summer (June–August)
- Tropical Storm Hilary
- Drought
- Excessive Heat
- Heat
- Flash Flood
Fall (September–November)
- Thunderstorm Wind
- Flash Flood
- Excessive Heat
- Heat
- High Wind
Arizona's worst outage events on record
The five largest outages in Arizona by duration and customers affected.
| Date | Duration | Customers affected | Cause |
|---|---|---|---|
| Jul 29, 2023 | 51 hrs | 54,076 (11%) | Excessive Heat |
| Jul 15, 2024 | 54 hrs | 38,456 (8%) | Excessive Heat |
| Oct 3, 2022 | 22 hrs | 91,239 (5%) | Heat |
| Sep 1, 2023 | 23 hrs | 83,324 (5%) | Excessive Heat |
| Aug 17, 2021 | 25 hrs | 72,380 (4%) | Flash Flood |
Highest-risk counties in Arizona
Lowest reliability percentile among Arizona's tracked counties.
| County | Grade | National percentile |
|---|---|---|
| La Paz County | D | 36th |
| Gila County | C | 51st |
| Navajo County | B | 72nd |
| Pinal County | B | 74th |
| Santa Cruz County | B | 75th |
Live weather alerts for Arizona
Flood Advisory
Flood Advisory issued October 1 at 5:32AM MST until October 2 at 5:00PM MST by NWS Tucson AZ
Read the official NWS alert →Flood Advisory
Flood Advisory issued October 1 at 5:32AM MST until October 2 at 10:00PM MST by NWS Tucson AZ
Read the official NWS alert →Flood Advisory
Flood Advisory issued October 1 at 5:32AM MST until October 3 at 12:00AM MST by NWS Tucson AZ
Read the official NWS alert →These live alerts come from the National Weather Service. They are public-safety information, not an outage prediction.
Arizona power outage FAQ
When do power outages happen most in Arizona?
July is historically the busiest single month for recorded outages in Arizona, and Summer (June–August) accounts for about 37% of all recorded outages across the state.
How long do power outages in Arizona typically last?
Across Arizona's tracked counties, the average recorded outage lasts about 2.5 hours, though individual events -- especially named storms -- can run much longer.
Which counties in Arizona have the highest outage risk?
La Paz County, Gila County, Navajo County, Pinal County, Santa Cruz County currently rank lowest for reliability in Arizona. See each county's page for its full history.
Does this page predict a power outage in Arizona?
No. It describes patterns in recorded county-level outage history, not a guaranteed future event. Check the live National Weather Service alerts below for current conditions.
Prepare for Arizona's outage season
Sized for Arizona's recorded outage frequency and duration.
