# Flood Watches Cover Tucson and Much of Southeast Arizona

NWS watches begin late Saturday, with Sunday rain forecast to bring flooding risk across valleys, mountains and low-water crossings.

By Will Langan | 24X7 News
Published: 2026-10-31T22:06:07.574Z
Updated: 2026-10-31T23:04:13.481Z
Section: U.S.
Format: News
Canonical: https://24x7news.us/articles/tucson-southeast-arizona-flood-watch-october-31-2026

The National Weather Service in Tucson issued flood watches October 31 for much of southeast Arizona, including the Tucson metropolitan area, western Pima County and parts of Cochise, Pinal, Graham and Greenlee counties.

The watches begin at 11 p.m. Mountain Standard Time Saturday and continue through late Sunday night. The bulletins list an end time of 5 a.m. MST Monday, November 2.

Forecasters expect an approaching weather system to bring widespread to numerous showers Sunday, with moderate to locally heavy rainfall. The watches describe possible flooding from excessive runoff rather than flooding confirmed throughout the covered region.

For the Tucson-area group of forecast zones, the NWS lists possible valley totals of one-half to 1.75 inches and mountain totals of one to more than three inches. That group includes the Tohono O’odham Nation, the upper Santa Cruz and Altar valleys, the upper Gila and Aravaipa valleys, and several mountain ranges.

A separate western Pima County bulletin forecasts one-half to one inch, with localized amounts up to 1.5 inches. The area includes Ajo and Organ Pipe Cactus National Monument.

For the Cochise County and upper San Pedro Valley group, the forecast is one-half to one inch in valleys and one to more than two inches in mountains. Covered areas include Sierra Vista, Benson, Douglas and Willcox, alongside the Chiricahua, Dragoon, Mule, Huachuca and Santa Rita mountains.

The differing totals apply to different forecast areas and elevations; they are not a single uniform prediction for southeast Arizona.

The weather service says runoff could flood streams, rivers, urban drainage areas and low-water crossings. It advises monitoring later forecasts and being prepared to act if warnings follow.

Sources
National Weather Service — October 31 Flood Watch 1: https://api.weather.gov/alerts/urn:oid:2.49.0.1.840.0.857a49bb7314f211a0dd27ff91d2802fbe20b3be.001.1
National Weather Service — October 31 Flood Watch 2: https://api.weather.gov/alerts/urn:oid:2.49.0.1.840.0.857a49bb7314f211a0dd27ff91d2802fbe20b3be.002.1
National Weather Service — October 31 Flood Watch 3: https://api.weather.gov/alerts/urn:oid:2.49.0.1.840.0.857a49bb7314f211a0dd27ff91d2802fbe20b3be.003.1

## Sources
- National Weather Service — October 31 Flood Watch 1: https://api.weather.gov/alerts/urn:oid:2.49.0.1.840.0.857a49bb7314f211a0dd27ff91d2802fbe20b3be.001.1
- National Weather Service — October 31 Flood Watch 2: https://api.weather.gov/alerts/urn:oid:2.49.0.1.840.0.857a49bb7314f211a0dd27ff91d2802fbe20b3be.002.1
- National Weather Service — October 31 Flood Watch 3: https://api.weather.gov/alerts/urn:oid:2.49.0.1.840.0.857a49bb7314f211a0dd27ff91d2802fbe20b3be.003.1
- Image source — WClarke, November24 2016 Santa Catalina Mountains; resized/branded adaptation CC BY-SA4.0: https://commons.wikimedia.org/wiki/File:View_of_the_Santa_Catalina_Mountains_from_West_Saguaro_National_Park_near_Tuscon,_AZ.jpg
- Image license — CC BY-SA4.0: https://creativecommons.org/licenses/by-sa/4.0/