August weather in Fairmont City, IL
The average temperature in Fairmont City in August is 76.9°F (66.1°F–87.8°F). Average precipitation: 3.68 inches.
August is a summer month in Fairmont City, and is warmer than the annual average of 56.5°F. Daily temperatures swing about 21.7°F between overnight low and afternoon high. Expect about 10 days with precipitation. Daylight averages about 13h 31m. For travel, August is a comfortable month to visit.
Avg High
87.8°F
Avg Low
66.1°F
Precipitation
3.68 in
Daylight
13h 31m
August records in Fairmont City
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| August 1 | 100.0°F (2012) | 57.0°F (1997) | 0.96 in (2016) |
| August 2 | 99.0°F (2006) | 57.9°F (2014) | 1.09 in (2023) |
| August 3 | 99.0°F (2002) | 55.9°F (2025) | 1.05 in (2022) |
| August 4 | 99.0°F (2002) | 55.9°F (2021) | 0.57 in (1998) |
| August 5 | 98.1°F (2002) | 53.1°F (2017) | 1.67 in (2023) |
| August 6 | 98.1°F (2007) | 52.0°F (2004) | 1.27 in (2002) |
| August 7 | 98.1°F (2007) | 51.1°F (1997) | 2.30 in (2014) |
| August 8 | 100.0°F (2012) | 53.1°F (1997) | 1.53 in (2000) |
| August 9 | 97.0°F (2001) | 54.0°F (2017) | 0.84 in (2015) |
| August 10 | 99.0°F (2010) | 55.0°F (2024) | 1.21 in (2025) |
| August 11 | 98.1°F (2007) | 53.1°F (2012) | 0.71 in (2002) |
| August 12 | 102.0°F (2007) | 46.9°F (2004) | 0.97 in (2021) |
| August 13 | 95.0°F (2010) | 48.0°F (2004) | 1.17 in (2005) |
| August 14 | 100.9°F (2007) | 46.9°F (2004) | 1.17 in (2016) |
| August 15 | 105.1°F (2007) | 48.0°F (2004) | 3.47 in (2016) |
| August 16 | 99.0°F (2003) | 48.0°F (2004) | 1.36 in (2009) |
| August 17 | 100.0°F (2000) | 54.0°F (2008) | 1.20 in (2000) |
| August 18 | 97.0°F (2025) | 53.1°F (2012) | 3.37 in (1998) |
| August 19 | 96.1°F (2005) | 55.9°F (2008) | 1.37 in (2015) |
| August 20 | 99.0°F (2023) | 53.1°F (2012) | 0.93 in (2010) |
| August 21 | 102.9°F (2003) | 53.1°F (1999) | 0.74 in (2019) |
| August 22 | 99.0°F (2023) | 51.1°F (2024) | 0.94 in (2019) |
| August 23 | 99.0°F (2007) | 52.0°F (1997) | 1.14 in (2021) |
| August 24 | 100.9°F (2023) | 53.1°F (2009) | 1.19 in (2018) |
| August 25 | 102.9°F (2023) | 50.0°F (2025) | 1.52 in (2005) |
| August 26 | 100.9°F (2003) | 48.0°F (2025) | 0.62 in (2005) |
| August 27 | 100.9°F (2024) | 46.9°F (2025) | 0.55 in (2000) |
| August 28 | 98.1°F (2007) | 52.0°F (2025) | 0.72 in (2022) |
| August 29 | 98.1°F (2013) | 54.0°F (2025) | 0.95 in (2018) |
| August 30 | 99.0°F (2013) | 51.1°F (2004) | 2.24 in (2019) |
| August 31 | 100.9°F (2013) | 51.1°F (2009) | 2.77 in (2012) |