Phoenix, Arizona – Unseasonably hot temperatures could push thermometers past 110°F in Phoenix by Friday as a powerful ridge of high pressure settles over the Desert Southwest, kicking off a volatile weather pattern that continues into early next week.
According to the National Weather Service in Phoenix, temperatures from Friday through Saturday are expected to climb 4 to 7 degrees above normal, with a 10–20% chance that areas in the lower deserts could reach or exceed 110°F. By Sunday, a shift in the pressure pattern will begin pulling tropical moisture into Arizona, boosting rain chances into Memorial Day.
Moisture levels could reach 200–250% of normal with precipitable water values between 1.1–1.7 inches. While forecast confidence remains low, there is a 5–10% chance for locally heavy rain exceeding half an inch, especially across central and southern Arizona. These amounts could break daily rainfall records, many of which are below 0.10 inches for this time of year.
Residents should limit outdoor activity during peak heat, hydrate frequently, and prepare for potential localized flooding if storms materialize. The evolving nature of this system means additional alerts may be issued—stay tuned for updates through the weekend.
