Flagstaff (AZ)
September
Weather in Flagstaff, Arizona for September 2027
Your guide to Flagstaff weather in September - trends and predictions
In general, the average temperature in Flagstaff at the beginning of September is 24.1 °C. As the month progressed, temperatures tended to significantly cool down, reaching an average of 20.5 °C by the end of September.
Flagstaff experiences moderate rainfall in September, with an average of 8 rainy days and a total precipitation of 76.7 mm.
Is September a good time to visit Flagstaff? check out the best time to travel to Flagstaff page.
✨ Is September a good time to visit Flagstaff? – Ask the AI Weatherman
Temperatures
Rain 🌧️
More
22
Dry days
8
Rainy days
0
Snow days
22°/13°
Temperatures
20 km/h
Avg max wind
50 %
Avg humidity
Flagstaff Weather September
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Temperatures trend during September in Flagstaff
See the weather trend as well as the moving average line
September weather in Flagstaff day by day
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| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| Sept. 1 |  Patchy rain possible | 24° /15° | 1.6 mm | 8 | |
| Sept. 2 |  Light rain | 24° /14° | 6.5 mm | 8 | |
| Sept. 3 | Patchy rain possible | 24° /15° | 1.2 mm | 8 | |
| Sept. 4 |  Partly cloudy | 24° /14° | 0.8 mm | 8 | |
| Sept. 5 |  Moderate rain | 24° /14° | 19.6 mm | 8 | |
| Sept. 6 |  Sunny | 24° /14° | 0 mm | 5 | |
| Sept. 7 | Patchy light rain | 24° /14° | 1.1 mm | 7 | |
| Sept. 8 |  Patchy light rain with thunder | 25° /14° | 0.7 mm | 6 | |
| Sept. 9 |  Thundery outbreaks possible | 24° /15° | 0.3 mm | 6 | |
| Sept. 10 | Partly cloudy | 26° /15° | 0.8 mm | 8 | |
| Sept. 11 | Patchy rain possible | 23° /14° | 2.1 mm | 7 | |
| Sept. 12 | Sunny | 23° /13° | 0.9 mm | 6 | |
| Sept. 13 | Sunny | 22° /11° | 0.8 mm | 6 | |
| Sept. 14 | Sunny | 23° /12° | 0.7 mm | 5 | |
| Sept. 15 | Patchy rain possible | 22° /12° | 1.5 mm | 5 | |
| Sept. 16 | Patchy rain possible | 21° /13° | 0.5 mm | 5 | |
| Sept. 17 | Partly cloudy | 20° /12° | 0.6 mm | 5 | |
| Sept. 18 | Partly cloudy | 21° /11° | 0 mm | 6 | |
| Sept. 19 | Sunny | 21° /11° | 0 mm | 7 | |
| Sept. 20 | Sunny | 20° /11° | 0 mm | 6 | |
| Sept. 21 | Thundery outbreaks possible | 18° /11° | 1.4 mm | 5 | |
| Sept. 22 | Light rain | 19° /11° | 9.1 mm | 5 | |
| Sept. 23 |  Cloudy | 22° /12° | 0.4 mm | 4 | |
| Sept. 24 | Sunny | 22° /11° | 0 mm | 4 | |
| Sept. 25 | Sunny | 23° /14° | 0.2 mm | 5 | |
| Sept. 26 | Partly cloudy | 21° /13° | 0.6 mm | 6 | |
| Sept. 27 | Partly cloudy | 21° /13° | 0.4 mm | 4 | |
| Sept. 28 | Moderate rain | 18° /12° | 17.8 mm | 4 | |
| Sept. 29 | Light rain | 19° /12° | 5.7 mm | 4 | |
| Sept. 30 | Patchy rain possible | 20° /12° | 1.2 mm | 4 | |
| Next | |||||
Important Notice
Our weather forecast for Flagstaff in September is based on the analysis of historical data rather than real-time forecast models. While this provides a general overview, weather conditions can change. We recommend that you check the Flagstaff forecast closer to your planned date for the most up-to-date weather information.
Change Month
Flagstaff in September - FAQ
What are the expected maximum and minimum temperatures in Flagstaff during September?
Enjoy moderate daytime temperatures of up to 22° and cooler nights around 13°. Ideal for a range of outdoor activities, from hiking to city tours.
How much rainfall should be expected in Flagstaff during September?
Moderate rainfall is anticipated in Flagstaff during September, with a total of 76.7 mm spread over approximately 8 days. Considering plans for rainy days is advisable.
What are the typical wind conditions in Flagstaff during September?
The average wind speed in Flagstaff during September is 20 km/h, suggesting breezy to windy conditions, depending on your activities.
September rainfall patterns in Flagstaff
Explore the daily rainfall trends and prepare for Flagstaffs September weather 💧
Typically, Flagstaff has 8 rainy days in September with a total of 76.7 mm of rainfall.
UV exposure in Flagstaff during September
Stay informed about UV levels for safe outdoor activities throughout the month of September ☀️
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