October weather in Petersburg, IL
The average temperature in Petersburg in October is 54.7°F (43.0°F–66.3°F). Average precipitation: 3.19 inches.
October is a fall month in Petersburg, and is warmer than the annual average of 52.3°F. Daily temperatures swing about 23.3°F between overnight low and afternoon high. Expect about 9 days with precipitation. Daylight averages about 10h 55m. For travel, October is a comfortable month to visit.
Avg High
66.3°F
Avg Low
43.0°F
Precipitation
3.19 in
Daylight
10h 55m
October records in Petersburg
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| October 1 | 89.1°F (2023) | 42.1°F (2015) | 0.98 in (2007) |
| October 2 | 87.1°F (2025) | 39.9°F (2020) | 0.88 in (2014) |
| October 3 | 89.1°F (2025) | 39.0°F (2020) | 1.61 in (2007) |
| October 4 | 89.1°F (2023) | 35.1°F (2014) | 1.63 in (1991) |
| October 5 | 87.1°F (2025) | 32.0°F (2020) | 2.04 in (1991) |
| October 6 | 87.1°F (2024) | 32.0°F (2020) | 0.37 in (2000) |
| October 7 | 87.1°F (2025) | 42.1°F (2023) | 0.85 in (1990) |
| October 8 | 84.0°F (2020) | 33.1°F (2022) | 2.16 in (2018) |
| October 9 | 84.0°F (2018) | 36.0°F (2022) | 1.62 in (1993) |
| October 10 | 84.0°F (2018) | 28.9°F (2015) | 0.95 in (2001) |
| October 11 | 84.9°F (2021) | 28.0°F (2015) | 1.50 in (2017) |
| October 12 | 82.9°F (2020) | 34.0°F (2018) | 0.97 in (2021) |
| October 13 | 87.1°F (2024) | 35.1°F (2018) | 0.74 in (2004) |
| October 14 | 78.1°F (2017) | 35.1°F (2022) | 2.63 in (2012) |
| October 15 | 86.0°F (2017) | 34.0°F (2022) | 0.99 in (2000) |
| October 16 | 77.0°F (2016) | 30.9°F (2018) | 0.73 in (2001) |
| October 17 | 80.1°F (2016) | 28.0°F (2015) | 1.04 in (2006) |
| October 18 | 86.0°F (2016) | 28.0°F (2022) | 1.52 in (1996) |
| October 19 | 80.1°F (2016) | 26.1°F (2022) | 1.73 in (2002) |
| October 20 | 79.0°F (2017) | 26.1°F (2022) | 1.41 in (1995) |
| October 21 | 79.0°F (2015) | 26.1°F (2018) | 0.77 in (2005) |
| October 22 | 86.0°F (2022) | 26.1°F (2018) | 0.34 in (2006) |
| October 23 | 82.9°F (2020) | 35.1°F (2014) | 2.08 in (2009) |
| October 24 | 77.0°F (2022) | 30.9°F (2018) | 0.80 in (2021) |
| October 25 | 77.0°F (2014) | 30.9°F (2018) | 1.75 in (2021) |
| October 26 | 73.0°F (2023) | 35.1°F (2015) | 1.00 in (2022) |
| October 27 | 73.0°F (2014) | 33.1°F (2020) | 0.91 in (2004) |
| October 28 | 73.0°F (2023) | 30.9°F (2024) | 1.12 in (1998) |
| October 29 | 73.0°F (2024) | 26.1°F (2017) | 0.83 in (2021) |
| October 30 | 84.0°F (2024) | 26.1°F (2017) | 1.77 in (2009) |
| October 31 | 81.0°F (2024) | 25.0°F (2014) | 0.97 in (2018) |