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What is Cortland, IL, Weather Like in October?
During the month of October, Cortland, IL,
has an average daytime high temperature of 63°F and an average overnight low temperature dropping to 41°F.
Around 2.96 inches of precipitation is received during the month,
with about 32.90 inches falling in a typical year.
0.10 inches of snow is the mean amount received during October.
Annually, Cortland receives around 24.70 inches of snow.
October 2025: Actual vs. Average Temperatures
Showing temperatures through today (October 23, 2025)
Actual High
Average High
Actual Low
Average Low
Month Summary
Average High: 69.6 F
(+5.3 vs avg)
Average Low: 49.3 F
(+6.6 vs avg)
This month was significantly warmer than average.
Actual data from: KDKB
Cortland, IL Daily Weather Averages for October
Recorded at De Kalb
(usc00112223),
4.6 miles
WNW of
Cortland, IL
| Day | Avg Temps (°F) | Precip (in) | Snow (in) | Degree Days (°F) | |||||
|---|---|---|---|---|---|---|---|---|---|
| Low | High | Mean | Month | Year | Month | Year | Heat | Cool | |
| 10/1 | 47 F | 69 F | 58 F | 0.10" | 30.04" | 0.00" | 24.60" | 8 F | 0.9 F |
| 10/2 | 46 F | 69 F | 58 F | 0.21" | 30.15" | 0.00" | 24.60" | 8.3 F | 0.9 F |
| 10/3 | 46 F | 68 F | 57 F | 0.31" | 30.25" | 0.00" | 24.60" | 8.7 F | 0.8 F |
| 10/4 | 46 F | 68 F | 57 F | 0.41" | 30.35" | 0.00" | 24.60" | 9 F | 0.7 F |
| 10/5 | 45 F | 67 F | 56 F | 0.51" | 30.45" | 0.00" | 24.60" | 9.4 F | 0.7 F |
| 10/6 | 45 F | 67 F | 56 F | 0.61" | 30.55" | 0.00" | 24.60" | 9.8 F | 0.6 F |
| 10/7 | 44 F | 66 F | 55 F | 0.70" | 30.64" | 0.00" | 24.60" | 10.2 F | 0.6 F |
| 10/8 | 44 F | 66 F | 55 F | 0.80" | 30.74" | 0.00" | 24.60" | 10.6 F | 0.5 F |
| 10/9 | 44 F | 66 F | 55 F | 0.89" | 30.83" | 0.00" | 24.60" | 11 F | 0.5 F |
| 10/10 | 43 F | 65 F | 54 F | 1.00" | 30.94" | 0.00" | 24.60" | 11.4 F | 0.5 F |
| 10/11 | 43 F | 65 F | 54 F | 1.10" | 31.04" | 0.00" | 24.60" | 11.8 F | 0.4 F |
| 10/12 | 42 F | 64 F | 53 F | 1.20" | 31.14" | 0.00" | 24.60" | 12.1 F | 0.4 F |
| 10/13 | 42 F | 64 F | 53 F | 1.29" | 31.23" | 0.00" | 24.60" | 12.5 F | 0.3 F |
| 10/14 | 42 F | 63 F | 52 F | 1.39" | 31.33" | 0.00" | 24.60" | 12.9 F | 0.3 F |
| 10/15 | 41 F | 63 F | 52 F | 1.48" | 31.42" | 0.00" | 24.60" | 13.3 F | 0.2 F |
| 10/16 | 41 F | 62 F | 52 F | 1.58" | 31.52" | 0.00" | 24.60" | 13.7 F | 0.2 F |
| 10/17 | 41 F | 62 F | 51 F | 1.68" | 31.62" | 0.00" | 24.60" | 14 F | 0.1 F |
| 10/18 | 40 F | 61 F | 51 F | 1.77" | 31.71" | 0.00" | 24.60" | 14.5 F | 0.1 F |
| 10/19 | 40 F | 61 F | 50 F | 1.87" | 31.81" | 0.00" | 24.60" | 14.9 F | 0.1 F |
| 10/20 | 40 F | 60 F | 50 F | 1.96" | 31.90" | 0.00" | 24.60" | 15.3 F | 0.1 F |
| 10/21 | 39 F | 60 F | 49 F | 2.05" | 31.99" | 0.00" | 24.60" | 15.7 F | 0.1 F |
| 10/22 | 39 F | 59 F | 49 F | 2.14" | 32.08" | 0.00" | 24.60" | 16.1 F | 0.1 F |
| 10/23 | 38 F | 59 F | 49 F | 2.23" | 32.17" | 0.00" | 24.60" | 16.6 F | 0.1 F |
| 10/24 | 38 F | 58 F | 48 F | 2.32" | 32.26" | 0.00" | 24.60" | 17 F | 0.1 F |
| 10/25 | 38 F | 58 F | 48 F | 2.41" | 32.35" | 0.10" | 24.70" | 17.4 F | 0.1 F |
| 10/26 | 37 F | 57 F | 47 F | 2.50" | 32.44" | 0.10" | 24.70" | 17.9 F | N/A |
| 10/27 | 37 F | 57 F | 47 F | 2.59" | 32.53" | 0.10" | 24.70" | 18.3 F | N/A |
| 10/28 | 37 F | 56 F | 46 F | 2.69" | 32.63" | 0.10" | 24.70" | 18.7 F | N/A |
| 10/29 | 36 F | 56 F | 46 F | 2.78" | 32.72" | 0.10" | 24.70" | 19.2 F | N/A |
| 10/30 | 36 F | 55 F | 45 F | 2.87" | 32.81" | 0.10" | 24.70" | 19.6 F | N/A |
| 10/31 | 36 F | 54 F | 45 F | 2.96" | 32.90" | 0.10" | 24.70" | 20.1 F | N/A |
