FLAGSTAFF, Ariz. – Northern Arizona drivers should brace for a disruptive shift in weather as showers and thunderstorms move in Thursday, September 25. The National Weather Service warns that wet roads on I-40 and surrounding highways could create hazardous travel conditions by late morning. Residents are urged to plan ahead, avoid unnecessary travel during peak rainfall, and keep phones charged in case of power outages.
According to the National Weather Service in Flagstaff, storms will build Thursday afternoon with a 30% chance of rain and thunderstorms by midday. Winds could gust near 22 mph, pushing showers across Coconino County into Friday. The strongest storms may reduce visibility on I-40, especially near the Flagstaff city center and eastward toward Winslow.
Showers are expected to linger Friday, with rain chances rising to 60%. By Saturday, skies may briefly clear, but additional scattered showers are likely to return Sunday. This unsettled stretch marks a noticeable transition into fall, though temperatures remain mild, holding in the 70s for daytime highs.
Travelers should pack extra time for commutes, watch for pooling water, and stay alert to lightning risk during outdoor activities. With the season’s first real taste of stormy fall weather arriving, more advisories could follow heading into next week.
Five Day Forecast for Flagstaff, AZ
- Tuesday: Sunny, high near 75. Light winds.
- Wednesday: Sunny, high near 77. Winds northeast 8 mph.
- Thursday (Sept. 25): 30% chance of showers and thunderstorms, high near 76. Gusts to 22 mph.
- Friday: Showers likely, 60% chance. High near 71.
- Saturday: Partly sunny, slight chance of storms, high near 70.
