September weather in St. Johns, AZ
The average temperature in St. Johns in September is 66.6°F (50.3°F–83.0°F). Average precipitation: 1.13 inches.
September is a fall month in St. Johns, and is warmer than the annual average of 54.1°F. Daily temperatures swing about 32.7°F between overnight low and afternoon high. Expect about 6 days with precipitation. Daylight averages about 12h 12m. For travel, September is a comfortable month to visit.
Avg High
83.0°F
Avg Low
50.3°F
Precipitation
1.13 in
Daylight
12h 12m
September records in St. Johns
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| September 1 | 95.0°F (2019) | 53.1°F (2000) | 0.47 in (2018) |
| September 2 | 93.0°F (2004) | 46.0°F (2010) | 0.20 in (2015) |
| September 3 | 96.1°F (2019) | 48.9°F (2010) | 0.40 in (2015) |
| September 4 | 97.0°F (2020) | 48.9°F (2008) | 0.22 in (2009) |
| September 5 | 97.0°F (2020) | 45.0°F (2016) | 0.07 in (2007) |
| September 6 | 98.1°F (2020) | 44.1°F (2004) | 0.10 in (2002) |
| September 7 | 97.0°F (2020) | 48.0°F (2018) | 0.44 in (2015) |
| September 8 | 95.0°F (2021) | 46.9°F (1999) | 0.51 in (2002) |
| September 9 | 93.0°F (2021) | 36.0°F (2001) | 0.27 in (2013) |
| September 10 | 93.0°F (2016) | 37.9°F (2020) | 1.14 in (2002) |
| September 11 | 93.0°F (2004) | 37.9°F (2020) | 0.50 in (2002) |
| September 12 | 95.0°F (2004) | 37.9°F (2020) | 0.54 in (2013) |
| September 13 | 91.0°F (2000) | 42.1°F (2020) | 0.13 in (2015) |
| September 14 | 93.0°F (2000) | 39.9°F (2008) | 0.86 in (2011) |
| September 15 | 90.0°F (2000) | 39.9°F (2012) | 0.07 in (2019) |
| September 16 | 91.9°F (2003) | 42.1°F (2005) | 0.09 in (2025) |
| September 17 | 90.0°F (2005) | 39.9°F (2006) | 0.10 in (2009) |
| September 18 | 91.0°F (2005) | 37.9°F (2006) | 0.50 in (2002) |
| September 19 | 91.9°F (2010) | 39.0°F (2006) | 0.26 in (2018) |
| September 20 | 93.9°F (2005) | 42.1°F (2017) | 0.04 in (2010) |
| September 21 | 89.1°F (2003) | 39.9°F (2021) | 0.32 in (2015) |
| September 22 | 90.0°F (2003) | 35.1°F (2004) | 0.84 in (2010) |
| September 23 | 91.0°F (2005) | 32.0°F (2009) | 0.83 in (2019) |
| September 24 | 89.1°F (2005) | 33.1°F (2016) | 0.00 in (1999) |
| September 25 | 89.1°F (2005) | 30.2°F (2017) | 0.41 in (2021) |
| September 26 | 89.1°F (2003) | 32.0°F (2017) | 0.26 in (2021) |
| September 27 | 91.9°F (2003) | 37.0°F (2013) | 0.50 in (2021) |
| September 28 | 95.0°F (2003) | 28.2°F (2013) | 0.22 in (2014) |
| September 29 | 91.9°F (2003) | 33.1°F (1999) | 0.42 in (2004) |
| September 30 | 90.0°F (2003) | 36.0°F (2020) | 0.48 in (2021) |