Weather
Phoenix, AZ Flood Risk Rises Sunday as Heavy Rain Moves In Tonight Oct 31-Nov 1
Phoenix, AZ – Another round of widespread rainfall is expected to move into central Arizona Saturday night, October 31, with flooding concerns increasing through Sunday, November 1, as heavy rain thre
By Jenna Hartley · 2026-10-31T18:16:13.342Z
Phoenix, AZ – Another round of widespread rainfall is expected to move into central Arizona Saturday night, October 31, with flooding concerns increasing through Sunday, November 1, as heavy rain threatens roadways, neighborhoods and normally dry washes across the Phoenix metropolitan area.
According to the National Weather Service in Phoenix, storms and flooding affected portions of the metro area overnight before a temporary break in activity Saturday morning. Forecasters expect rain to return Saturday night and become more widespread and persistent Sunday.
The Weather Prediction Center has placed areas northeast of Phoenix, including portions of the higher terrain near Payson and Globe, under a moderate risk of excessive rainfall Sunday. That designation indicates at least a 40% probability of rainfall exceeding flash flood guidance within the outlook area.
Phoenix, Mesa, Casa Grande and surrounding lower desert communities face a slight risk of excessive rainfall, with localized flooding possible.
Forecast rainfall totals range from 0.50 to 2 inches across Arizona's lower deserts, while higher terrain could receive 2 to 3.50 inches. Higher end scenarios could produce 3.50 to 4 inches or more in elevated areas.
The National Weather Service estimates a 60% to 99% probability of exceeding rainfall thresholds of 0.50 to 1 inch across much of south central Arizona.
Prolonged rainfall could lead to standing water on roads, longer commutes, rising creeks and dangerous flows through normally dry washes. Isolated thunderstorms are also possible, with probabilities of 10% to 20%.
Flooding concerns may increase Sunday as runoff accumulates and streams begin rising.
Motorists are urged to avoid flooded roadways and low water crossings, even when water appears shallow.
Residents should monitor updated National Weather Service forecasts and maintain multiple ways to receive emergency warnings as the storm system moves through the region.