August weather in Johnstown, CO
The average temperature in Johnstown in August is 69.8°F (52.9°F–86.7°F). Average precipitation: 1.29 inches.
August is a summer month in Johnstown, and is warmer than the annual average of 48.7°F. Daily temperatures swing about 33.8°F between overnight low and afternoon high. Expect about 9 days with precipitation. Daylight averages about 13h 36m. For travel, August is a comfortable month to visit.
Avg High
86.7°F
Avg Low
52.9°F
Precipitation
1.29 in
Daylight
13h 36m
August records in Johnstown
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| August 1 | 97.0°F (2011) | 43.0°F (1995) | 0.34 in (2013) |
| August 2 | 100.9°F (2008) | 48.9°F (1995) | 0.38 in (2020) |
| August 3 | 99.0°F (2024) | 48.9°F (1993) | 0.95 in (1991) |
| August 4 | 97.0°F (2024) | 46.0°F (1993) | 1.16 in (1999) |
| August 5 | 102.9°F (2024) | 48.0°F (1993) | 0.95 in (1997) |
| August 6 | 100.0°F (2022) | 46.9°F (1993) | 0.88 in (2023) |
| August 7 | 102.0°F (1995) | 48.0°F (1993) | 0.68 in (2017) |
| August 8 | 102.0°F (2025) | 50.0°F (2005) | 0.38 in (2010) |
| August 9 | 98.1°F (2025) | 50.0°F (2013) | 0.47 in (1997) |
| August 10 | 99.0°F (2020) | 50.0°F (2013) | 0.91 in (1994) |
| August 11 | 96.1°F (1995) | 50.0°F (2009) | 0.43 in (1990) |
| August 12 | 97.0°F (1996) | 44.1°F (2004) | 0.12 in (2016) |
| August 13 | 96.1°F (2022) | 44.1°F (2004) | 0.16 in (2024) |
| August 14 | 100.9°F (2007) | 46.0°F (2023) | 0.78 in (2024) |
| August 15 | 102.9°F (2025) | 46.0°F (2023) | 0.60 in (2015) |
| August 16 | 98.1°F (2015) | 44.1°F (2009) | 1.11 in (2008) |
| August 17 | 100.0°F (2023) | 44.1°F (2009) | 0.96 in (2008) |
| August 18 | 98.1°F (2024) | 44.1°F (2009) | 0.11 in (2015) |
| August 19 | 100.0°F (2020) | 44.1°F (2015) | 1.09 in (2004) |
| August 20 | 99.0°F (2019) | 43.0°F (2015) | 0.48 in (2021) |
| August 21 | 100.0°F (2019) | 44.1°F (2016) | 0.35 in (1993) |
| August 22 | 99.0°F (2023) | 44.1°F (2016) | 0.14 in (1996) |
| August 23 | 100.9°F (2020) | 43.0°F (2015) | 0.45 in (1992) |
| August 24 | 98.1°F (2011) | 43.0°F (2015) | 1.29 in (1992) |
| August 25 | 96.1°F (2020) | 46.0°F (2015) | 0.33 in (1992) |
| August 26 | 98.1°F (2019) | 46.9°F (1992) | 1.56 in (2006) |
| August 27 | 98.1°F (2020) | 37.9°F (1992) | 0.33 in (2004) |
| August 28 | 93.9°F (2010) | 39.9°F (2004) | 1.16 in (2023) |
| August 29 | 97.0°F (2012) | 39.9°F (2004) | 0.24 in (2007) |
| August 30 | 98.1°F (2012) | 43.0°F (1993) | 1.49 in (2003) |
| August 31 | 97.0°F (2015) | 42.1°F (1993) | 0.92 in (2003) |