PHOENIX, Ariz. – Arizona’s fall heat will peak Tuesday with dangerous triple-digit highs before storm chances return later in the week. Residents across Phoenix should brace for 104°F by Tuesday afternoon, making hydration and heat safety critical.
According to the National Weather Service in Phoenix, calm winds will give way to light breezes as temperatures surge into record territory for mid-September. Heat remains the primary concern Tuesday, but attention shifts to increasing thunderstorm potential by Thursday, which could bring heavy rain, lightning, and brief flooding on major roadways, including Interstate 10.
Monday night will stay warm with a low near 80°F. By Tuesday, clear skies will fuel intense heat, with highs reaching 104°F. Wednesday holds slightly cooler but still oppressive conditions at 103°F, followed by the first signs of change with a 10 percent chance of storms.
Thunderstorm chances climb Thursday night into Friday, with the National Weather Service noting up to a 40 percent chance of rain by late Friday. These storms may bring localized flash flooding and strong winds, especially along desert washes and busy travel routes. Drivers should avoid flooded intersections and prepare for slower commutes.
Residents are urged to limit outdoor activity during peak afternoon heat, check on vulnerable neighbors, and secure outdoor items before storms arrive.
Warnings and advisories could be issued later this week as storm chances rise.
Five-Day Forecast for Phoenix, Arizona
- Tuesday: Sunny, high near 104°F. Low around 81°F.
- Wednesday: Mostly sunny, high near 103°F. Slight storm chance late. Low 81°F.
- Thursday: High near 101°F with 10% storm chance afternoon. Low 81°F.
- Friday: 40% chance of thunderstorms after 11 a.m., high near 97°F. Low 80°F.
- Saturday: 20% chance of storms, high near 97°F. Low 81°F.
