July weather in Romeoville, IL
The average temperature in Romeoville in July is 74.6°F (64.5°F–84.7°F). Average precipitation: 4.50 inches.
July is a summer month in Romeoville, and is warmer than the annual average of 50.9°F. Daily temperatures swing about 20.2°F between overnight low and afternoon high. Expect about 10 days with precipitation. Daylight averages about 14h 44m. For travel, July is a comfortable month to visit.
Avg High
84.7°F
Avg Low
64.5°F
Precipitation
4.50 in
Daylight
14h 44m
July records in Romeoville
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| July 1 | 91.0°F (2002) | 53.1°F (2024) | 0.61 in (1999) |
| July 2 | 95.0°F (2012) | 48.0°F (2001) | 2.60 in (2023) |
| July 3 | 93.9°F (2012) | 54.0°F (2014) | 0.85 in (2001) |
| July 4 | 99.0°F (2012) | 55.0°F (2008) | 1.75 in (2018) |
| July 5 | 100.0°F (2012) | 54.0°F (2001) | 0.88 in (2003) |
| July 6 | 100.9°F (2012) | 51.1°F (2001) | 1.56 in (2015) |
| July 7 | 100.9°F (2012) | 54.0°F (2015) | 1.16 in (2010) |
| July 8 | 91.9°F (2002) | 54.0°F (2004) | 0.52 in (2014) |
| July 9 | 91.9°F (2001) | 57.0°F (2023) | 1.71 in (2002) |
| July 10 | 95.0°F (2019) | 55.9°F (1999) | 1.68 in (2000) |
| July 11 | 91.0°F (2005) | 54.0°F (1999) | 0.96 in (2023) |
| July 12 | 91.9°F (2012) | 55.9°F (2007) | 2.63 in (2023) |
| July 13 | 93.0°F (2019) | 55.9°F (2007) | 1.37 in (2016) |
| July 14 | 91.9°F (2019) | 55.0°F (2001) | 1.21 in (2024) |
| July 15 | 93.9°F (2012) | 53.1°F (2014) | 1.65 in (2003) |
| July 16 | 97.0°F (2012) | 53.1°F (2014) | 0.79 in (2015) |
| July 17 | 99.0°F (2012) | 53.1°F (2009) | 1.42 in (2003) |
| July 18 | 97.0°F (2012) | 57.0°F (2017) | 3.06 in (2007) |
| July 19 | 98.1°F (2011) | 55.9°F (2024) | 0.88 in (2020) |
| July 20 | 98.1°F (2011) | 54.0°F (2000) | 0.71 in (2018) |
| July 21 | 99.0°F (2011) | 55.9°F (2000) | 2.24 in (2017) |
| July 22 | 93.0°F (2001) | 55.0°F (2000) | 0.69 in (2004) |
| July 23 | 93.9°F (2001) | 53.1°F (2000) | 1.70 in (2011) |
| July 24 | 102.0°F (2005) | 52.0°F (2000) | 2.62 in (2010) |
| July 25 | 99.0°F (2012) | 54.0°F (2013) | 0.59 in (2005) |
| July 26 | 91.9°F (2020) | 57.9°F (2024) | 1.67 in (2005) |
| July 27 | 93.0°F (2023) | 55.0°F (2013) | 4.90 in (2003) |
| July 28 | 91.0°F (1999) | 50.0°F (2013) | 1.30 in (2021) |
| July 29 | 95.0°F (1999) | 52.0°F (2013) | 0.53 in (2019) |
| July 30 | 100.0°F (1999) | 55.9°F (2003) | 1.33 in (2000) |
| July 31 | 96.1°F (2006) | 55.0°F (2009) | 2.03 in (2010) |