Flagstaff, Arizona – Thunderstorms could dampen outdoor plans and impact Friday travel in Flagstaff as monsoon conditions intensify across Northern Arizona. Storms are expected to develop after 11 a.m. on Friday, July 18, bringing brief downpours, lightning, and wind gusts reaching 16 mph.
According to the National Weather Service, Friday will begin mostly sunny, with storms likely to fire up by midday and linger through the evening. While temperatures will climb to around 81°F, outdoor events and commutes—especially along I-17 and I-40—may face delays due to isolated storms and reduced visibility.
Saturday will bring a repeat of the pattern, with a 30% chance of storms between 11 a.m. and 5 p.m., followed by partly clear skies and overnight lows near 54°F. Sunday’s weather remains unstable with a 20% chance of afternoon and evening showers, though the daytime high should reach a warm 83°F.
Looking ahead:
- Monday (July 21): 20% storm chance returns after 11 a.m. High near 82°F, gusts up to 17 mph.
- Tuesday (July 22): Slightly drier, high near 81°F, with light south winds increasing to 22 mph gusts.
- Wednesday (July 23): Thunderstorms possible again after 11 a.m., high near 82°F with stronger gusts (up to 22 mph).
What to do: Residents should secure outdoor furniture, avoid hiking during storm windows, and monitor alerts from the National Weather Service. Rain chances will fluctuate, but daily gusts and lightning remain consistent hazards through midweek.
⚠️ Storm threats continue into early next week. Stay weather-aware and check for updated advisories through Wednesday, July 23.
