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What is Posen, IL, Weather Like in October?
During the month of October, Posen, IL,
has an average daytime high temperature of 64°F and an average overnight low temperature dropping to 47°F.
Around 3.86 inches of precipitation is received during the month,
with about 35.82 inches falling in a typical year.
0.10 inches of snow is the mean amount received during October.
Annually, Posen receives around 29.40 inches of snow.
October 2025: Actual vs. Average Temperatures
Showing temperatures through today (October 21, 2025)
Actual High
Average High
Actual Low
Average Low
Month Summary
Average High: 76.6 F
(+10.4 vs avg)
Average Low: 54.1 F
(+5.1 vs avg)
This month was significantly warmer than average.
Actual data from: MID_AW254
Posen, IL Daily Weather Averages for October
Recorded at Chicago Midway Ap 3sw
(usc00111577),
8.8 miles
NW of
Posen, IL
| Day | Avg Temps (°F) | Precip (in) | Snow (in) | Degree Days (°F) | |||||
|---|---|---|---|---|---|---|---|---|---|
| Low | High | Mean | Month | Year | Month | Year | Heat | Cool | |
| 10/1 | 53 F | 70 F | 62 F | 0.12" | 32.08" | 0.00" | 29.30" | 5.3 F | 1.9 F |
| 10/2 | 52 F | 70 F | 61 F | 0.24" | 32.20" | 0.00" | 29.30" | 5.6 F | 1.7 F |
| 10/3 | 52 F | 70 F | 61 F | 0.36" | 32.32" | 0.00" | 29.30" | 5.9 F | 1.6 F |
| 10/4 | 52 F | 69 F | 60 F | 0.48" | 32.44" | 0.00" | 29.30" | 6.2 F | 1.5 F |
| 10/5 | 51 F | 69 F | 60 F | 0.59" | 32.55" | 0.00" | 29.30" | 6.5 F | 1.4 F |
| 10/6 | 51 F | 68 F | 59 F | 0.71" | 32.67" | 0.00" | 29.30" | 6.9 F | 1.3 F |
| 10/7 | 50 F | 68 F | 59 F | 0.82" | 32.78" | 0.00" | 29.30" | 7.2 F | 1.2 F |
| 10/8 | 50 F | 67 F | 59 F | 0.94" | 32.90" | 0.00" | 29.30" | 7.6 F | 1.1 F |
| 10/9 | 49 F | 67 F | 58 F | 1.06" | 33.02" | 0.00" | 29.30" | 7.9 F | 1 F |
| 10/10 | 49 F | 66 F | 58 F | 1.19" | 33.15" | 0.00" | 29.30" | 8.2 F | 1 F |
| 10/11 | 49 F | 66 F | 57 F | 1.32" | 33.28" | 0.00" | 29.30" | 8.6 F | 0.9 F |
| 10/12 | 48 F | 66 F | 57 F | 1.45" | 33.41" | 0.00" | 29.30" | 8.9 F | 0.8 F |
| 10/13 | 48 F | 65 F | 57 F | 1.58" | 33.54" | 0.00" | 29.30" | 9.2 F | 0.7 F |
| 10/14 | 48 F | 65 F | 56 F | 1.70" | 33.66" | 0.00" | 29.30" | 9.5 F | 0.6 F |
| 10/15 | 47 F | 64 F | 56 F | 1.83" | 33.79" | 0.00" | 29.30" | 9.9 F | 0.5 F |
| 10/16 | 47 F | 64 F | 55 F | 1.96" | 33.92" | 0.00" | 29.30" | 10.2 F | 0.5 F |
| 10/17 | 46 F | 63 F | 55 F | 2.10" | 34.06" | 0.00" | 29.30" | 10.6 F | 0.4 F |
| 10/18 | 46 F | 63 F | 54 F | 2.22" | 34.18" | 0.00" | 29.30" | 11 F | 0.4 F |
| 10/19 | 46 F | 62 F | 54 F | 2.35" | 34.31" | 0.00" | 29.30" | 11.4 F | 0.3 F |
| 10/20 | 45 F | 62 F | 54 F | 2.48" | 34.44" | 0.00" | 29.30" | 11.7 F | 0.3 F |
| 10/21 | 45 F | 62 F | 53 F | 2.60" | 34.56" | 0.00" | 29.30" | 12.1 F | 0.3 F |
| 10/22 | 45 F | 61 F | 53 F | 2.73" | 34.69" | 0.00" | 29.30" | 12.5 F | 0.3 F |
| 10/23 | 44 F | 61 F | 52 F | 2.85" | 34.81" | 0.00" | 29.30" | 12.9 F | 0.2 F |
| 10/24 | 44 F | 60 F | 52 F | 2.98" | 34.94" | 0.00" | 29.30" | 13.3 F | 0.2 F |
| 10/25 | 43 F | 60 F | 52 F | 3.11" | 35.07" | 0.00" | 29.30" | 13.7 F | 0.2 F |
| 10/26 | 43 F | 59 F | 51 F | 3.23" | 35.19" | 0.10" | 29.40" | 14.1 F | 0.2 F |
| 10/27 | 43 F | 59 F | 51 F | 3.37" | 35.33" | 0.10" | 29.40" | 14.5 F | 0.2 F |
| 10/28 | 42 F | 58 F | 50 F | 3.50" | 35.46" | 0.10" | 29.40" | 14.9 F | 0.1 F |
| 10/29 | 42 F | 58 F | 50 F | 3.62" | 35.58" | 0.10" | 29.40" | 15.3 F | 0.1 F |
| 10/30 | 42 F | 57 F | 49 F | 3.74" | 35.70" | 0.10" | 29.40" | 15.7 F | 0.1 F |
| 10/31 | 41 F | 57 F | 49 F | 3.86" | 35.82" | 0.10" | 29.40" | 16.1 F | 0.1 F |
