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Hourly Forecast
Daylight Hours
06:15
Sunrise
18:25
Sunset
Moon
Waxing Crescent
11:54
Moonrise
20:52
Moonset
Daily Forecast
Wednesday
Today
Friday
Saturday
Sunday
Monday
Tuesday
Wednesday
Thursday
Friday
Air Quality Data Available
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UV Index
Humidity
Weather in Flagstaff tomorrow, September 17, 2026
Conditions in Flagstaff on September 17, 2026 favour clear skies, so the day opens with a fine, sunny outlook. Any interruptions to the blue should be brief rather than lasting. The first half of the day looks overcast, as cloud amounts reach about 100% around 00:00. Brighter weather, if it comes, waits until later.
The temperature range runs from about 13°C up to 34°C. Relative humidity sits between 52% and 90%, reaching its peak around 00:00. Airflow remains manageable, reaching about 4.0 km/h around 11:00.
The afternoon keeps an overcast feel, as cloud reaches about 100% around 12:00. Outdoor plans may still want a flexible backup. Expect visibility near 16.0 km, with poorer spells close to 15.4 km. Daylight runs from 06:16 to 18:24, lasting 12 hours 7 minutes of sunlight today.
In short, September 17, 2026 looks like a fine day in Flagstaff for being outside, peaking around 34°C.
Frequently asked questions about weather in Flagstaff
How warm does it get in Flagstaff?
The warmest month in Flagstaff is July, with average high temperatures of 28°C. The average temperature during this period is around 22°C.
How cold does it get in Flagstaff?
The coldest month in Flagstaff is January, with average low temperatures of -5°C. The average temperature during this period is around -1°C.
What is the wettest time of year in Flagstaff?
The wettest month in Flagstaff is July, with an average of 124mm of precipitation.
What is the driest time of year in Flagstaff?
The driest month in Flagstaff is June, with an average of 20mm of precipitation.
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