The bigger story Monday is a wet and unusually cool turn across the Valley. Showers and thunderstorms are expected to become more likely through the day. The high should reach about 83 degrees.
The National Weather Service in Phoenix expects rain bands to linger through Monday, with heavier showers or thunderstorms developing by mid- to late afternoon. The chance of precipitation rises to about 70%, and most rainfall should be light, though localized downpours could produce around a quarter-inch or more. Winds should generally run 5 to 10 mph from the north or northwest, with stronger gusts possible near showers and storms.
Heavier Rain Threat Builds Monday Night
Monday night brings a stronger rain signal, with an 80% chance of showers and thunderstorms and a low near 70 degrees. Rainfall could total one-half to three-quarters of an inch in the Phoenix forecast area, while the heaviest cells may bring brief downpours and gusty winds. Commuters and anyone heading out for evening plans should be ready for rapidly changing conditions.
Parts of central and eastern Arizona are under a Flood Watch from late Monday night through Tuesday evening, while La Paz County has a separate watch for Monday evening into late Monday night. The Phoenix lower desert is not expected to see uniform soaking rain, but localized flooding remains possible where heavier storms stall or repeatedly move over the same area.
Tuesday Stays Cool Before Sunshine Takes Over
Tuesday remains unsettled, with showers and thunderstorms likely before noon and additional chances into the afternoon. Unsettled weather continues Tuesday night.
Wednesday begins the reset with sunny skies. Drier, warmer weather is expected later in the week as Phoenix heads back toward more typical early-October heat.
