August weather in Thornton, CO
The average temperature in Thornton in August is 73.1°F (57.2°F–88.9°F). Average precipitation: 1.32 inches.
August is a summer month in Thornton, and is warmer than the annual average of 52.4°F. Daily temperatures swing about 31.7°F between overnight low and afternoon high. Expect about 8 days with precipitation. Daylight averages about 13h 35m. For travel, August is hot.
Avg High
88.9°F
Avg Low
57.2°F
Precipitation
1.32 in
Daylight
13h 35m
August records in Thornton
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| August 1 | 100.9°F (2008) | 52.0°F (1992) | 0.45 in (2021) |
| August 2 | 109.9°F (2008) | 42.1°F (1986) | 0.25 in (2006) |
| August 3 | 102.9°F (2008) | 48.0°F (1986) | 0.34 in (1991) |
| August 4 | 102.0°F (2008) | 44.1°F (1986) | 1.75 in (1999) |
| August 5 | 100.9°F (2025) | 48.9°F (1996) | 0.90 in (1997) |
| August 6 | 102.0°F (2022) | 41.0°F (1986) | 0.40 in (1997) |
| August 7 | 102.9°F (2003) | 46.9°F (1996) | 1.33 in (1986) |
| August 8 | 102.9°F (2025) | 46.9°F (1996) | 0.80 in (2022) |
| August 9 | 102.0°F (2025) | 51.1°F (2023) | 0.27 in (2001) |
| August 10 | 99.0°F (2020) | 48.0°F (1985) | 0.65 in (2010) |
| August 11 | 98.1°F (2002) | 51.1°F (1996) | 0.65 in (1994) |
| August 12 | 100.0°F (2022) | 48.0°F (1985) | 0.21 in (1989) |
| August 13 | 98.1°F (2007) | 46.0°F (2002) | 0.32 in (1989) |
| August 14 | 104.0°F (2007) | 50.0°F (2004) | 0.52 in (2006) |
| August 15 | 100.9°F (2025) | 46.0°F (1986) | 0.36 in (2008) |
| August 16 | 102.9°F (2002) | 48.9°F (1995) | 1.18 in (2008) |
| August 17 | 102.0°F (2023) | 46.9°F (1985) | 1.21 in (2008) |
| August 18 | 100.9°F (2024) | 48.9°F (2015) | 0.17 in (2009) |
| August 19 | 102.0°F (2020) | 48.0°F (2015) | 1.72 in (2004) |
| August 20 | 99.0°F (2019) | 46.0°F (2016) | 0.46 in (2021) |
| August 21 | 100.0°F (2003) | 48.0°F (2004) | 0.21 in (1987) |
| August 22 | 100.0°F (2025) | 51.1°F (1987) | 0.50 in (2005) |
| August 23 | 100.0°F (2003) | 48.0°F (2015) | 0.46 in (1987) |
| August 24 | 102.0°F (2020) | 46.0°F (1985) | 2.45 in (1992) |
| August 25 | 98.1°F (2011) | 46.0°F (2016) | 0.43 in (1987) |
| August 26 | 100.9°F (2019) | 48.0°F (1992) | 0.55 in (2023) |
| August 27 | 99.0°F (2001) | 46.0°F (1987) | 0.35 in (2020) |
| August 28 | 99.0°F (2012) | 41.0°F (2004) | 0.26 in (2014) |
| August 29 | 99.0°F (2012) | 44.1°F (2004) | 0.72 in (2000) |
| August 30 | 100.9°F (1990) | 46.9°F (1992) | 0.55 in (2003) |
| August 31 | 100.0°F (2005) | 45.0°F (2020) | 0.54 in (2003) |