FLAGSTAFF, Ariz. – A pale dawn spreads across the San Francisco Peaks this morning as the air sharpens and breath fog drifts through the pines. Early commuters can feel winter’s first edge—temperatures in the low 30s, clear skies, and that telltale crunch of frost along driveways and rooftops.
According to the National Weather Service in Flagstaff, a calm, dry pattern holds through the week, but crisp mornings and chilly evenings will define the days ahead. Afternoon highs reach the mid-60s to upper 60s, while pre-dawn lows dip well below freezing, especially across higher terrain near Munds Park and Doney Park. Anyone commuting early or caring for livestock should plan for icy windshields and cold starts before sunrise.
By Halloween Friday, sunny skies will dominate, making for perfect daylight activities and mild travel conditions on I-17 and I-40. Temperatures fall rapidly after sunset, with readings near 40° by 8 p.m. and flirting with 32° late in the evening. Trick-or-treaters should bundle up with hats and gloves beneath costumes; it will feel brisk under clear skies and light winds.
Weekend conditions stay seasonably cool and tranquil, ideal for fall cleanup or mountain hikes before November’s pattern shift. Models hint at a modest cool-down early next week, with the first chance of light snow showers possible in the San Francisco Peaks as moisture creeps back into northern Arizona.
To be fair, it’s a quiet stretch for now—but the seasonal chill is here to stay. After all, clocks fall back early Sunday at 2 a.m., marking darker evenings and the true start of northern Arizona’s slow turn toward winter.
Five-Day Forecast for Flagstaff, AZ:
Wed: 65/28 – Sunny, crisp start; light east winds.
Thu: 68/30 – Sunny and calm; cold night ahead.
Fri: 66/36 – Mostly sunny; trick-or-treat temps near 40°.
Sat: 68/39 – Sunny; light breeze, perfect fall day.
Sun: 70/40 – Mild and clear; early chill returns after dark.
