Flagstaff (Grand Canyon) weather in August
Temperature, rain and sunshine in August: long-term averages from 30 years of weather data, not a forecast.
Holiday weather in August
Good
Best time to visit: April – June, September – October
What is the weather like in Flagstaff (Grand Canyon) in August?
In August, Flagstaff (Grand Canyon) is warm: daytime highs average 27 °C, and nights cool down to about 15 °C. The sun shines for around 8 hours a day. It rains often – on about 16 days, adding up to 97 mm. All in all, August is a good month for a holiday in Flagstaff (Grand Canyon).
August compared
How the weather changes from July to September. Tap a month to open it.
| JulyJul | AugustAug | SeptemberSep | |
|---|---|---|---|
| Score | 65 | 71 | 88 |
| Day | 29° | 27° | 24° |
| Night | 16° | 15° | 13° |
| Sun | 9 h | 8 h | 8 h |
| Rain days | 15 | 16 | 8 |
More details for August
- Daylight
- 13 h 31 min05:46 – 19:17
- UV index
- 11 · extremeclear sky, noon (estimate)All months
- Muggy days
- 0 daysdew point 18 °C or moreAll months
- Wind
- 14 km/haverage daily peakAll months
- Cloud cover
- 44 %on averageAll months
- Hot days
- 4 days30 °C or moreAll months
- Snow days
- 0 days1 cm or more of fresh snowAll months
- Time zone
- UTC−7America/Phoenix
How the score comes together
- Temperatureweight 50 %100 %
- Sunshineweight 20 %83 %
- Few rainy daysweight 30 %16 %
Each factor is rated from 0 to 100 % and weighted for the travel style “Nature escape”.
What to pack in August
- Sunscreen
- Sunglasses & sun hat
- Light, breathable clothes
- A jumper for the evenings
- Rain jacket or umbrella
Flagstaff (Grand Canyon) in August: quick answers
Is Flagstaff (Grand Canyon) hot in August?
Warm rather than hot: in August, daytime highs in Flagstaff (Grand Canyon) average 27 °C and nights cool to about 15 °C. On about 4 days the thermometer climbs to 30 °C or more.
Does it rain much in Flagstaff (Grand Canyon) in August?
It rains often – on about 16 days, adding up to 97 mm.
Flagstaff (Grand Canyon) month by month
The whole year in Flagstaff (Grand Canyon)All destinations: USAWhere to go in August
Climate averages 1996–2025, not a forecast. Data: Copernicus ERA5 / ERA5-Land via Open-Meteo.com (CC BY 4.0), NOAA OISST, WMO 1991–2020 (NOAA NCEI), GeoNames (CC BY 4.0). Sources & licences