Sonali TiwaryA cutoff low-pressure system brought rain across the Phoenix metro on Friday, October 30, 2026 — the day before Halloween. The storm dropped totals ranging from light accumulations near the city core to heavier downpours in the East Valley foothills, leaving wet desert washes and slick roads heading into Halloween weekend.
The National Weather Service Phoenix office tracked scattered rain bands across Maricopa County throughout Friday. Central Phoenix and Glendale recorded lighter, steady accumulations as the main moisture plume tracked through. East Valley gauges in north Scottsdale and east Mesa, where terrain forces storm cells upward, logged heavier totals that triggered localized street ponding at low-lying intersections.
Sky Harbor International Airport’s official gauge — which sits in the relatively sheltered city core — recorded a fraction of the totals logged at foothills stations, a common pattern during Phoenix-area cutoff lows. Weather alerts were issued for both the Phoenix and Tucson metro areas through Saturday, October 31.
If you live in Phoenix, Mesa, Scottsdale, Glendale, or Tucson, Friday’s rain has left desert washes, low-lying intersections, and hiking trails wet and slick heading into Halloween weekend. Lingering moisture is keeping Saturday temperatures below seasonal norms with rain chances holding through Saturday night. Parents and drivers should watch for ponding on Valley freeways and pack rain gear for evening trick-or-treating.
Cutoff lows in the desert southwest track along narrow topographic corridors. Cells that track through the McDowell and Superstition mountain ranges produce orographic lift — forced upward airflow — that sharply increases precipitation over north Scottsdale, east Mesa, and Cave Creek. Central Phoenix, south Glendale, and the airport sit in the lower-elevation valley corridor, where the same cells produce moderate totals. This is why residents in the foothills often see street flooding while the official Phoenix rainfall total reported in national databases looks minimal.
Saturday’s forecast shows clearing from the north through the afternoon, with the best Halloween trick-or-treating window opening after 7 p.m. in most Valley communities. High-country areas above 5,000 feet saw snow from the same system Friday, with the Maricopa County Flood Control District monitoring wash levels through the weekend.
Because desert storm cells track along narrow foothill corridors, Sky Harbor’s official gauge routinely records only a fraction of the rainfall experienced in north Scottsdale and east Mesa during cutoff low events. Residents in those communities frequently see street flooding and wash closures while the officially published Phoenix total from the same storm looks unremarkably low.
How did the rain affect Phoenix and Scottsdale on Friday, October 30?
Rainfall totals across the Phoenix metro varied widely on Friday, October 30, 2026. Central Phoenix and Glendale saw lighter, steady accumulations as scattered bands tracked through Maricopa County. Foothills gauges in north Scottsdale and east Mesa recorded heavier downpours that triggered localized street ponding, while Sky Harbor’s airport gauge logged lower totals from the same system.
The National Weather Service Phoenix office has Halloween weekend forecasts at weather.gov/psr. Check the Maricopa County Flood Control District website for real-time wash road status before driving in low-lying areas this weekend.
