Flagstaff (Grand Canyon) weather in September
Temperature, rain and sunshine in September: long-term averages from 30 years of weather data, not a forecast.
Holiday weather in September
Excellent
Best time to visit: April – June, September – October
What is the weather like in Flagstaff (Grand Canyon) in September?
In September, Flagstaff (Grand Canyon) is warm: daytime highs average 24 °C, and nights cool down to about 13 °C. The sun shines for around 8 hours a day. Rain falls on about 8 days, adding up to 48 mm. All in all, September is an excellent month for a holiday in Flagstaff (Grand Canyon).
September compared
How the weather changes from August to October. Tap a month to open it.
| AugustAug | SeptemberSep | OctoberOct | |
|---|---|---|---|
| Score | 71 | 88 | 93 |
| Day | 27° | 24° | 18° |
| Night | 15° | 13° | 7° |
| Sun | 8 h | 8 h | 7 h |
| Rain days | 16 | 8 | 5 |
More details for September
- Daylight
- 12 h 27 min06:08 – 18:35
- UV index
- 9 · very highclear sky, noon (estimate)All months
- Muggy days
- 0 daysdew point 18 °C or moreAll months
- Wind
- 16 km/haverage daily peakAll months
- Cloud cover
- 27 %on averageAll months
- Hot days
- 0 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 %85 %
- Few rainy daysweight 30 %70 %
Each factor is rated from 0 to 100 % and weighted for the travel style “Nature escape”.
What to pack in September
- Sunscreen
- Sunglasses & sun hat
- A jumper for the evenings
- Rain jacket or umbrella
Flagstaff (Grand Canyon) in September: quick answers
Is Flagstaff (Grand Canyon) hot in September?
Warm rather than hot: in September, daytime highs in Flagstaff (Grand Canyon) average 24 °C and nights cool to about 13 °C.
Does it rain much in Flagstaff (Grand Canyon) in September?
Rain falls on about 8 days, adding up to 48 mm.
Flagstaff (Grand Canyon) month by month
The whole year in Flagstaff (Grand Canyon)All destinations: USAWhere to go in September
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