September weather in Mammoth, AZ
The average temperature in Mammoth in September is 73.5°F (58.8°F–88.2°F). Average precipitation: 1.25 inches.
September is a fall month in Mammoth, and is warmer than the annual average of 62.1°F. Daily temperatures swing about 29.4°F between overnight low and afternoon high. Daylight averages about 12h 11m. For travel, September is hot.
Avg High
88.2°F
Avg Low
58.8°F
Precipitation
1.25 in
Daylight
12h 11m
September records in Mammoth
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| September 1 | 99.0°F (2011) | 55.9°F (2017) | 1.30 in (2015) |
| September 2 | 99.0°F (2019) | 57.9°F (2017) | 0.93 in (2018) |
| September 3 | 98.1°F (2025) | 55.9°F (2022) | 0.13 in (2018) |
| September 4 | 97.0°F (2019) | 53.1°F (2016) | 0.49 in (2013) |
| September 5 | 104.0°F (2020) | 44.1°F (2018) | 0.21 in (2014) |
| September 6 | 102.9°F (2020) | 46.9°F (2018) | 0.10 in (2015) |
| September 7 | 100.0°F (2020) | 42.1°F (2018) | 0.11 in (2019) |
| September 8 | 98.1°F (2023) | 32.0°F (2018) | 2.60 in (2014) |
| September 9 | 97.0°F (2023) | 41.0°F (2018) | 1.00 in (2012) |
| September 10 | 102.0°F (2023) | 44.1°F (2020) | 0.42 in (2011) |
| September 11 | 100.9°F (2023) | 48.9°F (2010) | 0.30 in (2011) |
| September 12 | 96.1°F (2017) | 51.1°F (2020) | 0.20 in (2025) |
| September 13 | 96.1°F (2017) | 54.0°F (2011) | 0.51 in (2025) |
| September 14 | 97.0°F (2019) | 55.9°F (2016) | 0.35 in (2011) |
| September 15 | 97.0°F (2018) | 54.0°F (2016) | 0.47 in (2011) |
| September 16 | 98.1°F (2018) | 51.1°F (2016) | 0.69 in (2024) |
| September 17 | 95.0°F (2020) | 52.0°F (2016) | 0.22 in (2019) |
| September 18 | 98.1°F (2023) | 52.0°F (2011) | 0.54 in (2014) |
| September 19 | 96.1°F (2010) | 52.0°F (2024) | 0.96 in (2025) |
| September 20 | 95.0°F (2010) | 52.0°F (2017) | 0.48 in (2018) |
| September 21 | 95.0°F (2020) | 52.0°F (2017) | 0.15 in (2013) |
| September 22 | 95.0°F (2023) | 48.9°F (2024) | 1.94 in (2022) |
| September 23 | 93.9°F (2012) | 45.0°F (2013) | 0.42 in (2015) |
| September 24 | 95.0°F (2012) | 43.0°F (2017) | 0.37 in (2022) |
| September 25 | 96.1°F (2024) | 39.0°F (2017) | 0.71 in (2019) |
| September 26 | 99.0°F (2024) | 43.0°F (2017) | 1.02 in (2025) |
| September 27 | 99.0°F (2024) | 46.9°F (2017) | 0.29 in (2019) |
| September 28 | 102.0°F (2024) | 42.1°F (2013) | 0.35 in (2011) |
| September 29 | 102.0°F (2024) | 50.0°F (2021) | 0.00 in (2010) |
| September 30 | 99.0°F (2024) | 46.9°F (2014) | 0.28 in (2021) |