Flagstaff, AZ – Frost glitters across pine needles and rooftops this early Sunday morning as Flagstaff wakes to a brisk 30°F chill under clear skies. The air is still and sharp, with only the faint hum of a coming southwesterly breeze. After this cold start, Arizona’s mountain city begins a slow warm-up — but not for long.
The National Weather Service says Flagstaff’s weather will shift from bright and calm to cooler and more unsettled by midweek. Sunday climbs toward 68°F, offering a mild break from the early-morning freeze. Monday and Tuesday stay dry and mostly sunny, with highs near 70°F and light winds. However, the region’s early fall stability won’t hold for long.
By Wednesday, a weak system sliding across northern Arizona could bring a slight chance of showers, with models hinting at cooler air and increased cloud cover. Winds may gust between 20–25 mph during the afternoon, marking the next temperature dip as highs slide back into the mid-60s.
Those planning outdoor work, hiking, or travel along I-40 should expect shifting winds and falling temperatures midweek. Nights remain cold — dropping near freezing through Wednesday — and frost is likely in low-lying areas.
Looking ahead to late week, conditions dry out again, but highs stay in the 60s as Flagstaff edges deeper into its winter transition. It’s the kind of calm, cold rhythm that signals the high country’s next seasonal turn — perhaps the first flurry not far away.
