August weather in St. Johns, AZ
The average temperature in St. Johns in August is 73.2°F (58.5°F–87.9°F). Average precipitation: 2.08 inches.
August is a summer month in St. Johns, and is warmer than the annual average of 54.1°F. Daily temperatures swing about 29.4°F between overnight low and afternoon high. Expect about 11 days with precipitation. Daylight averages about 13h 18m. For travel, August is a comfortable month to visit.
Avg High
87.9°F
Avg Low
58.5°F
Precipitation
2.08 in
Daylight
13h 18m
August records in St. Johns
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| August 1 | 100.0°F (2020) | 55.9°F (2000) | 1.16 in (2007) |
| August 2 | 98.1°F (2020) | 57.0°F (2001) | 0.45 in (2007) |
| August 3 | 98.1°F (2020) | 55.0°F (2015) | 0.42 in (2008) |
| August 4 | 97.0°F (2009) | 52.0°F (2025) | 2.47 in (2007) |
| August 5 | 97.0°F (2003) | 55.9°F (2001) | 0.53 in (2017) |
| August 6 | 97.0°F (2018) | 54.0°F (1999) | 0.31 in (2005) |
| August 7 | 98.1°F (2018) | 55.0°F (1999) | 0.55 in (2005) |
| August 8 | 96.1°F (2004) | 46.9°F (2009) | 0.25 in (2008) |
| August 9 | 97.0°F (2003) | 55.0°F (2010) | 0.10 in (2019) |
| August 10 | 100.9°F (2003) | 53.1°F (2009) | 0.64 in (2021) |
| August 11 | 100.0°F (2003) | 54.0°F (2013) | 0.27 in (2015) |
| August 12 | 97.0°F (2003) | 53.1°F (1999) | 0.83 in (2014) |
| August 13 | 97.0°F (2020) | 53.1°F (1999) | 0.49 in (2021) |
| August 14 | 99.0°F (2020) | 48.0°F (2016) | 0.16 in (2007) |
| August 15 | 100.9°F (2020) | 54.0°F (2009) | 0.49 in (1999) |
| August 16 | 100.9°F (2020) | 54.0°F (2019) | 0.11 in (2008) |
| August 17 | 97.0°F (2020) | 48.9°F (2009) | 0.49 in (2005) |
| August 18 | 97.0°F (2020) | 51.1°F (2009) | 0.22 in (2018) |
| August 19 | 98.1°F (2020) | 51.1°F (2016) | 0.27 in (2012) |
| August 20 | 98.1°F (2020) | 51.1°F (2018) | 0.55 in (2004) |
| August 21 | 100.0°F (2020) | 52.0°F (2002) | 0.27 in (2012) |
| August 22 | 99.0°F (2020) | 52.0°F (2021) | 0.61 in (2010) |
| August 23 | 97.0°F (2020) | 52.0°F (1999) | 1.69 in (2012) |
| August 24 | 97.0°F (2011) | 50.0°F (2002) | 0.39 in (2006) |
| August 25 | 96.1°F (2020) | 45.0°F (2002) | 0.57 in (2020) |
| August 26 | 95.0°F (2002) | 48.0°F (2002) | 0.87 in (2015) |
| August 27 | 98.1°F (2019) | 50.0°F (2002) | 0.19 in (2016) |
| August 28 | 95.0°F (2005) | 48.9°F (2016) | 0.25 in (2019) |
| August 29 | 95.0°F (2005) | 46.0°F (2016) | 0.16 in (2011) |
| August 30 | 95.0°F (2019) | 48.0°F (2002) | 0.28 in (2006) |
| August 31 | 96.1°F (2019) | 51.1°F (2000) | 0.25 in (2008) |