July weather in Petersburg, IL
The average temperature in Petersburg in July is 75.5°F (65.4°F–85.5°F). Average precipitation: 3.87 inches.
July is a summer month in Petersburg, and is warmer than the annual average of 52.3°F. Daily temperatures swing about 20.1°F between overnight low and afternoon high. Expect about 8 days with precipitation. Daylight averages about 14h 35m. For travel, July is a comfortable month to visit.
Avg High
85.5°F
Avg Low
65.4°F
Precipitation
3.87 in
Daylight
14h 35m
July records in Petersburg
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| July 1 | 91.9°F (2018) | 48.9°F (2024) | 2.69 in (1993) |
| July 2 | 90.0°F (2018) | 55.0°F (2024) | 0.57 in (1993) |
| July 3 | 91.0°F (2019) | 57.9°F (2021) | 1.95 in (1994) |
| July 4 | 91.0°F (2017) | 59.0°F (2015) | 0.72 in (2008) |
| July 5 | 91.9°F (2022) | 62.1°F (2015) | 2.10 in (2000) |
| July 6 | 96.1°F (2022) | 61.0°F (2024) | 1.15 in (2017) |
| July 7 | 91.9°F (2020) | 55.0°F (2018) | 0.84 in (1994) |
| July 8 | 91.0°F (2020) | 55.9°F (2015) | 3.39 in (2022) |
| July 9 | 91.9°F (2020) | 55.0°F (2015) | 2.28 in (2015) |
| July 10 | 91.0°F (2020) | 59.0°F (2015) | 2.10 in (2003) |
| July 11 | 91.9°F (2017) | 63.0°F (2015) | 1.60 in (2000) |
| July 12 | 91.0°F (2020) | 64.0°F (2019) | 3.13 in (2008) |
| July 13 | 91.9°F (2017) | 61.0°F (2020) | 1.05 in (2006) |
| July 14 | 91.0°F (2018) | 63.0°F (2020) | 0.72 in (1993) |
| July 15 | 91.0°F (2023) | 59.0°F (2017) | 2.05 in (2009) |
| July 16 | 93.0°F (2024) | 62.1°F (2016) | 2.84 in (2024) |
| July 17 | 91.0°F (2025) | 61.0°F (2021) | 0.83 in (2007) |
| July 18 | 90.0°F (2015) | 57.9°F (2024) | 1.50 in (2001) |
| July 19 | 91.0°F (2020) | 55.0°F (2024) | 1.59 in (2025) |
| July 20 | 93.0°F (2017) | 57.0°F (2024) | 0.82 in (1999) |
| July 21 | 95.0°F (2017) | 60.1°F (2023) | 0.66 in (1989) |
| July 22 | 95.0°F (2017) | 57.9°F (2015) | 2.44 in (2008) |
| July 23 | 91.0°F (2017) | 57.0°F (2019) | 1.73 in (1998) |
| July 24 | 93.9°F (2022) | 59.0°F (2019) | 1.69 in (1993) |
| July 25 | 91.9°F (2016) | 60.1°F (2019) | 0.52 in (1993) |
| July 26 | 91.0°F (2020) | 61.0°F (2019) | 1.92 in (1992) |
| July 27 | 91.9°F (2023) | 57.0°F (2018) | 1.72 in (2011) |
| July 28 | 96.1°F (2023) | 57.0°F (2018) | 0.75 in (2024) |
| July 29 | 96.1°F (2023) | 57.0°F (2022) | 0.72 in (2016) |
| July 30 | 91.0°F (2025) | 46.0°F (2015) | 1.75 in (2018) |
| July 31 | 87.1°F (2023) | 57.9°F (2019) | 0.75 in (2024) |