Phoenix is expected to have a dry day Tuesday, with temperatures around 90 before a wetter and stormier pattern takes over. Showers and thunderstorms are possible Tuesday night, with the most serious rain and flooding concerns arriving Wednesday evening through Thursday afternoon. The National Weather Service forecast for Phoenix calls for clouds to increase Tuesday.
Storm Chances Build After Dark
Tuesday night could bring uncertain showers and a few isolated thunderstorms overnight. A Flood Watch is in effect across much of south-central and eastern Arizona from Wednesday afternoon through Thursday evening—not Tuesday night—as heavy rain could bring a flash-flood threat. The Phoenix point forecast and the NWS watch notice give the latest timing.
Wednesday will be cooler, with highs in the mid to upper 80s as showers develop during the day. Storm activity is expected to continue overnight. Some storms may produce damaging wind gusts or hail, and an isolated tornado is possible. The NWS Phoenix forecast gives the overnight rain chance, while the office’s weather briefing outlines the severe-storm threats.
Thursday Brings The Biggest Weather Concerns
Rain chances are expected to end late Thursday afternoon, with highs in the low 80s. Heavier downpours could overwhelm drainage systems quickly, especially where storms repeatedly move over the same areas. The National Weather Service’s Phoenix forecast lists the Thursday rain chance and gust potential.
The Flood Watch is scheduled to remain in effect through Thursday evening. Forecasters expect the heaviest and most widespread rain from Wednesday evening into Thursday afternoon, so drivers should avoid flooded roads and never attempt to cross moving water.
Floodwaters can make roads dangerous quickly. Phoenix says just 6 inches of moving water can cause most cars to lose control, while 2 feet can carry away most vehicles, including SUVs and pickups. The city advises drivers not to enter flooded roads or go around barricades. Phoenix’s flood-safety guidance also warns that water can hide a washed-out roadbed.
Cooler, Drier Weather Returns Friday
Quieter, drier weather is expected to begin Friday, with highs that may struggle to reach 80.
