August weather in Grain Valley, MO
The average temperature in Grain Valley in August is 77.3°F (67.6°F–86.9°F). Average precipitation: 4.54 inches.
August is a summer month in Grain Valley, and is warmer than the annual average of 55.7°F. Daily temperatures swing about 19.3°F between overnight low and afternoon high. Expect about 10 days with precipitation. Daylight averages about 13h 32m. For travel, August is a comfortable month to visit.
Avg High
86.9°F
Avg Low
67.6°F
Precipitation
4.54 in
Daylight
13h 32m
August records in Grain Valley
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| August 1 | 102.0°F (2011) | 61.0°F (2025) | 1.15 in (2016) |
| August 2 | 109.0°F (2011) | 55.9°F (2009) | 0.29 in (2013) |
| August 3 | 99.0°F (2005) | 60.1°F (2020) | 0.50 in (2014) |
| August 4 | 97.0°F (2016) | 54.0°F (2020) | 0.53 in (2004) |
| August 5 | 99.0°F (2024) | 59.0°F (2017) | 4.33 in (2017) |
| August 6 | 102.0°F (2006) | 57.9°F (2004) | 2.64 in (2014) |
| August 7 | 102.9°F (2012) | 59.0°F (2004) | 1.79 in (2013) |
| August 8 | 100.9°F (2012) | 60.1°F (2002) | 0.86 in (2007) |
| August 9 | 102.0°F (2006) | 57.0°F (2024) | 0.64 in (2007) |
| August 10 | 99.0°F (2010) | 57.9°F (2024) | 0.92 in (2009) |
| August 11 | 100.0°F (2010) | 55.0°F (2004) | 0.65 in (2024) |
| August 12 | 100.0°F (2010) | 50.0°F (2004) | 2.78 in (2005) |
| August 13 | 100.9°F (2010) | 57.0°F (2014) | 1.76 in (2005) |
| August 14 | 99.0°F (2007) | 55.9°F (2002) | 0.54 in (2018) |
| August 15 | 99.0°F (2007) | 51.1°F (2004) | 0.40 in (2011) |
| August 16 | 100.0°F (2003) | 57.9°F (2004) | 1.44 in (2022) |
| August 17 | 102.9°F (2003) | 57.0°F (2013) | 1.46 in (2009) |
| August 18 | 104.0°F (2003) | 53.1°F (2012) | 1.51 in (2015) |
| August 19 | 100.9°F (2003) | 55.9°F (2004) | 2.08 in (2005) |
| August 20 | 102.0°F (2003) | 54.0°F (2015) | 1.72 in (2010) |
| August 21 | 106.0°F (2003) | 55.9°F (2004) | 3.48 in (2017) |
| August 22 | 97.0°F (2012) | 57.0°F (2009) | 1.95 in (2017) |
| August 23 | 98.1°F (2023) | 55.0°F (2017) | 1.99 in (2004) |
| August 24 | 102.0°F (2023) | 52.0°F (2015) | 2.16 in (2016) |
| August 25 | 104.0°F (2023) | 55.9°F (2010) | 1.52 in (2019) |
| August 26 | 102.9°F (2003) | 52.0°F (2025) | 1.83 in (2016) |
| August 27 | 99.0°F (2024) | 61.0°F (2025) | 2.25 in (2004) |
| August 28 | 96.1°F (2008) | 57.9°F (2023) | 1.15 in (2008) |
| August 29 | 98.1°F (2024) | 57.0°F (2009) | 0.89 in (2019) |
| August 30 | 99.0°F (2012) | 52.0°F (2009) | 3.62 in (2003) |
| August 31 | 100.0°F (2011) | 57.0°F (2009) | 3.54 in (2003) |