Flagstaff weather in August
August in Flagstaff: warm, rainy, with clean air — an excellent time to visit.
#4 of 12 months in Flagstaff · #216 of 897 destinations to visit in August · comfort 88/100 (tier A)
Updated June 2026 · climate normals from ERA5 reanalysis
Traveller notes on Flagstaff in August
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Flagstaff climate normals — August
| Daytime high | 28°C / 82°F | 🌤 warm |
|---|---|---|
| Nighttime low | 16°C / 61°F | |
| Rainfall | 93 mm / 3.7 in | 🌧 rainy |
| Rainy days | 14 days | |
| Humidity | 63% | 💧 humid |
| Dew point | 12°C / 53°F | |
| Sunshine | 12.1 h/day | |
| Daylight | 13.4 h | |
| Wind | 14 km/h / 8 mph | |
| Air quality (US AQI) | 38 | 🍃 good |
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
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Flagstaff in August — FAQ
- Is August a good time to visit Flagstaff?
- August in Flagstaff: warm, rainy, with clean air — an excellent time to visit. It ranks #4 of 12 months for Flagstaff on SeasonMap's comfort score (88/100).
- What is the weather like in Flagstaff in August?
- In August, Flagstaff averages a daily high of 27.8°C and a low of 16.1°C, with about 92.9 mm of rain over roughly 14.4 rainy days.
- What is the air quality in Flagstaff in August?
- Flagstaff has a mean US Air Quality Index of about 38 in August.