Flagstaff (AZ)
August
Weather in Flagstaff, Arizona for August 2025
Your guide to Flagstaff weather in August - trends and predictions
Extreme Heat Warning - See hour by hour.
The forecast for the first days of August 2025 in Flagstaff predicts temperatures to be around 30 °F, close to the historical average.
In general, the average temperature in Flagstaff at the beginning of August is 30.7 °F. As the month progressed, temperatures tended to significantly cool down, reaching an average of 24.9 °F by the end of August.
Flagstaff in August brings notable rainfall, with an average of 18 rainy days and a total precipitation of 102.8 mm.
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Temperatures
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13
Dry days
18
Rainy days
0
Snow days
27°/16°
Temperatures
20 km/h
Avg max wind
49 %
Avg humidity
Flagstaff Weather August
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Temperatures trend during August in Flagstaff
See the weather trend as well as the moving average line
August weather in Flagstaff day by day
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| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| Aug. 1 |  Sunny | 29° /19° | 0 mm | 3.3 | |
| Aug. 2 | Sunny | 31° /19° | 0 mm | 3.3 | |
| Aug. 3 | Sunny | 31° /16° | 0 mm | 0 | |
| Aug. 4 | Sunny | 30° /17° | 0 mm | 6 | |
| Aug. 5 | Sunny | 30° /17° | 0 mm | 6 | |
| Aug. 6 |  Patchy rain possible | 31° /18° | 0.2 mm | 5 | |
| Aug. 7 | Sunny | 33° /19° | 0 mm | 7 | |
| Aug. 8 | Sunny | 34° /20° | 0 mm | 7 | |
| Aug. 9 | Patchy rain possible | 32° /19° | 0.8 mm | 5 | |
| Aug. 10 |  Moderate rain | 30° /18° | 5.1 mm | 5 | |
| Aug. 11 |  Partly cloudy | 29° /19° | 0 mm | 6 | |
| Aug. 12 | Patchy rain possible | 28° /16° | 1.4 mm | 5 | |
| Aug. 13 | Patchy rain possible | 28° /16° | 0.8 mm | 4 | |
| Aug. 14 | Sunny | 26° /15° | 0 mm | 7 | |
| Aug. 15 | Sunny | 27° /16° | 0 mm | 7 | |
| Aug. 16 | Sunny | 28° /16° | 0 mm | 7 | |
| Aug. 17 | Patchy rain possible | 29° /16° | 3.1 mm | 6 | |
| Aug. 18 |  Patchy light rain with thunder | 27° /16° | 5.5 mm | 6 | |
| Aug. 19 | Patchy rain possible | 28° /15° | 0.1 mm | 6 | |
| Aug. 20 | Patchy rain possible | 29° /18° | 0 mm | 6 | |
| Aug. 21 | Patchy rain possible | 28° /17° | 8.2 mm | 6 | |
| Aug. 22 | Patchy light rain with thunder | 23° /14° | 13.6 mm | 5 | |
| Aug. 23 | Patchy rain possible | 23° /14° | 1.8 mm | 5 | |
| Aug. 24 | Partly cloudy | 24° /14° | 0 mm | 6 | |
| Aug. 25 | Sunny | 24° /13° | 0 mm | 6 | |
| Aug. 26 | Sunny | 25° /14° | 0 mm | 7 | |
| Aug. 27 | Patchy rain possible | 25° /15° | 0.1 mm | 6 | |
| Aug. 28 | Patchy rain possible | 25° /16° | 0 mm | 6 | |
| Aug. 29 | Patchy rain possible | 25° /15° | 0.1 mm | 6 | |
| Aug. 30 | Patchy rain possible | 25° /15° | 2.2 mm | 6 | |
| Aug. 31 | Patchy light rain with thunder | 25° /15° | 4.2 mm | 5 | |
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Important Notice
Our weather forecast for Flagstaff in August 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.
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Flagstaff in August - FAQ
What are the expected maximum and minimum temperatures in Flagstaff during August?
During August, expect a variety of temperatures with highs around 27° and lows near 16°, suitable for diverse activities and preferences.
How much rainfall should be expected in Flagstaff during August?
Significant rainfall exceeding 102.8 mm is expected in Flagstaff during August, occurring over more than 18 days. Preparing for wet conditions is recommended in your planning.
What are the typical wind conditions in Flagstaff during August?
The average wind speed in Flagstaff during August is 20 km/h, suggesting breezy to windy conditions, depending on your activities.
August rainfall patterns in Flagstaff
Explore the daily rainfall trends and prepare for Flagstaffs August weather 💧
UV exposure in Flagstaff during August
Stay informed about UV levels for safe outdoor activities throughout the month of August ☀️
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