October weather in DeKalb, IL
The average temperature in DeKalb in October is 51.5°F (41.0°F–62.0°F). Average precipitation: 2.96 inches.
October is a fall month in DeKalb, and is warmer than the annual average of 48.5°F. Daily temperatures swing about 21°F between overnight low and afternoon high. Expect about 10 days with precipitation. Daylight averages about 10h 50m. For travel, October is a comfortable month to visit.
Avg High
62.0°F
Avg Low
41.0°F
Precipitation
2.96 in
Snow
0.1 in
October records in DeKalb
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| October 1 | 88.0°F (1971) | 32.0°F (1984) | 0.91 in (1977) |
| October 2 | 89.1°F (1976) | 25.0°F (1974) | 1.10 in (2018) |
| October 3 | 88.0°F (1976) | 28.0°F (1974) | 1.92 in (2019) |
| October 4 | 89.1°F (2025) | 27.0°F (1989) | 1.03 in (1985) |
| October 5 | 89.1°F (2005) | 26.1°F (1989) | 2.82 in (1991) |
| October 6 | 88.0°F (1997) | 26.1°F (1988) | 1.14 in (1995) |
| October 7 | 87.1°F (2007) | 26.1°F (1988) | 1.40 in (2025) |
| October 8 | 89.1°F (2007) | 21.9°F (1987) | 0.76 in (2018) |
| October 9 | 86.0°F (2007) | 23.0°F (1987) | 1.88 in (1982) |
| October 10 | 88.0°F (2010) | 28.0°F (1993) | 0.52 in (1969) |
| October 11 | 84.0°F (2010) | 3.0°F (1988) | 2.98 in (1969) |
| October 12 | 82.9°F (2024) | 21.9°F (1988) | 1.05 in (2023) |
| October 13 | 86.0°F (1975) | 21.0°F (1988) | 1.81 in (1969) |
| October 14 | 84.9°F (1975) | 21.0°F (1988) | 1.30 in (2017) |
| October 15 | 82.0°F (1989) | 28.0°F (2006) | 2.93 in (2017) |
| October 16 | 82.0°F (1999) | 27.0°F (1970) | 1.01 in (2007) |
| October 17 | 78.1°F (1998) | 25.0°F (1992) | 0.73 in (2006) |
| October 18 | 82.0°F (2016) | 21.0°F (1976) | 2.65 in (1998) |
| October 19 | 75.9°F (2005) | 18.0°F (1992) | 1.17 in (1984) |
| October 20 | 79.0°F (1971) | 18.0°F (1992) | 0.92 in (1982) |
| October 21 | 82.0°F (1979) | 24.1°F (2018) | 0.76 in (1972) |
| October 22 | 82.0°F (1979) | 21.0°F (1976) | 1.38 in (2020) |
| October 23 | 78.1°F (1975) | 21.9°F (1969) | 2.17 in (2001) |
| October 24 | 79.0°F (1973) | 18.0°F (1981) | 1.67 in (1985) |
| October 25 | 79.0°F (2023) | 21.9°F (1987) | 2.19 in (2021) |
| October 26 | 77.0°F (1989) | 21.0°F (1979) | 0.92 in (2022) |
| October 27 | 75.9°F (2000) | 25.0°F (1988) | 1.58 in (2019) |
| October 28 | 75.9°F (2014) | 19.0°F (1976) | 1.44 in (1970) |
| October 29 | 80.1°F (1999) | 23.0°F (1980) | 0.60 in (1974) |
| October 30 | 81.0°F (2024) | 12.9°F (1988) | 1.18 in (2009) |
| October 31 | 77.0°F (2024) | 17.1°F (1988) | 0.80 in (2013) |