Flagstaff (AZ)
August
Weather in Flagstaff, Arizona for August 2026
Your guide to Flagstaff weather in August - trends and predictions
Extreme Heat Warning - See hour by hour.
So far, August 2026 in Flagstaff is slightly warmer than the historical average by 0.9 °F.
Expect cooler weather in the next days in Flagstaff with the forecast suggesting a temperature of 26.5 °F, lower than the historical average.
In general, the average temperature in Flagstaff at the beginning of August is 29.9 °F. As the month progressed, temperatures tended to significantly cool down, reaching an average of 23.9 °F by the end of August.
Flagstaff in August brings notable rainfall, with an average of 20 rainy days and a total precipitation of 69.7 mm.
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Temperatures
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11
Dry days
20
Rainy days
0
Snow days
27°/17°
Temperatures
20 km/h
Avg max wind
43 %
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 |  Moderate rain at times | 30° /17° | 3 mm | 9 | |
| Aug. 2 |  Patchy rain possible | 30° /18° | 0.6 mm | 9 | |
| Aug. 3 | Moderate rain at times | 30° /17° | 2.3 mm | 10 | |
| Aug. 4 |  Patchy light rain | 30° /17° | 1.4 mm | 9 | |
| Aug. 5 | Patchy rain possible | 29° /18° | 0.4 mm | 9 | |
| Aug. 6 | Patchy light drizzle | 30° /17° | 5.1 mm | 10 | |
| Aug. 7 |  Patchy light rain with thunder | 30° /17° | 4.1 mm | 10 | |
| Aug. 8 |  Thundery outbreaks possible | 30° /17° | 2.4 mm | 10 | |
| Aug. 9 |  Sunny | 30° /19° | 5.6 mm | 10.2 | |
| Aug. 10 | Sunny | 29° /15° | 19.6 mm | 9.2 | |
| Aug. 11 | Patchy rain possible | 27° /14° | 16.9 mm | 10.1 | |
| Aug. 12 | Patchy rain possible | 23° /15° | 4.6 mm | 10.1 | |
| Aug. 13 | Patchy rain possible | 21° /14° | 16.9 mm | 5 | |
| Aug. 14 | Patchy rain possible | 20° /14° | 13.2 mm | 5 | |
| Aug. 15 | Sunny | 23° /14° | 0 mm | 6 | |
| Aug. 16 | Sunny | 22° /13° | 3.7 mm | 6 | |
| Aug. 17 | Sunny | 25° /14° | 0 mm | 7 | |
| Aug. 18 | Sunny | 28° /16° | 0 mm | 7 | |
| Aug. 19 | Sunny | 29° /17° | 0 mm | 7 | |
| Aug. 20 | Sunny | 31° /17° | 0 mm | 8 | |
| Aug. 21 | Sunny | 31° /17° | 0 mm | 8 | |
| Aug. 22 | Sunny | 32° /18° | 0 mm | 8 | |
| Aug. 23 | Patchy rain possible | 26° /17° | 1.7 mm | 6 | |
| Aug. 24 |  Partly cloudy | 24° /15° | 10.1 mm | 6 | |
| Aug. 25 | Sunny | 23° /16° | 0 mm | 6 | |
| Aug. 26 | Sunny | 23° /14° | 2.3 mm | 6 | |
| Aug. 27 | Patchy rain possible | 23° /14° | 0 mm | 6 | |
| Aug. 28 | Patchy rain possible | 23° /16° | 0 mm | 6 | |
| Aug. 29 | Patchy rain possible | 24° /15° | 0.8 mm | 6 | |
| Aug. 30 | Patchy rain possible | 25° /15° | 1.1 mm | 7 | |
| Aug. 31 | Patchy light rain with thunder | 26° /16° | 2.1 mm | 6 | |
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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 17°, suitable for diverse activities and preferences.
How much rainfall should be expected in Flagstaff during August?
Moderate rainfall is anticipated in Flagstaff during August, with a total of 69.7 mm spread over approximately 20 days. Considering plans for rainy days is advisable.
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 💧
Typically, Flagstaff has 20 rainy days in August with a total of 69.7 mm of rainfall.
UV exposure in Flagstaff during August
Stay informed about UV levels for safe outdoor activities throughout the month of August ☀️
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