Flagstaff, Ariz. – Drivers across northern Arizona could face gusty winds and scattered storms Friday afternoon, September 12, especially along I-40 and I-17. Breezy conditions may create hazardous travel for high-profile vehicles, and residents should stay alert for quick weather changes.
According to the National Weather Service in Flagstaff, a 20 percent chance of thunderstorms begins after 11 a.m. Friday. Winds may reach 33 mph during the afternoon, bringing sudden visibility reductions and travel delays. Anyone driving through the mountain passes should slow down and keep both hands on the wheel.
Temperatures Friday will top out near 73°F before dropping to 44°F overnight. Conditions improve Saturday with sunny skies, highs near 73°F, and winds easing to 16 mph or less. By Sunday, warmer air builds in, sending highs toward 76°F with calm, clear nights.
The storm window remains short, but residents should secure loose outdoor items, delay afternoon hikes, and avoid isolated backcountry areas during storm hours. Lightning strikes remain possible even with low storm coverage.
Heading into early next week, dry skies dominate. Southwest winds relax, and highs steadily climb toward the upper 70s. The region will transition toward a more stable fall pattern by Tuesday.
Warnings may be limited Friday, but gusty winds and fast-forming cells can surprise drivers. Residents should monitor alerts before heading into the high country.
Five-Day Forecast for Flagstaff, AZ
- Friday: High 73°F, breezy, 20% chance of storms after 11 a.m. Low 44°F.
- Saturday: Sunny, high 73°F, winds up to 16 mph. Low 44°F.
- Sunday: Sunny, high 76°F. Calm overnight, low 46°F.
- Monday: Mostly sunny, high 77°F. Low 47°F.
- Tuesday: Sunny, high 79°F. Winds light, low 47°F.
