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What is Deer Plain, IL, Weather Like in October?
During the month of October, Deer Plain, IL,
has an average daytime high temperature of 70°F and an average overnight low temperature dropping to 46°F.
Around 2.66 inches of precipitation is received during the month,
with about 33.90 inches falling in a typical year.
Snow is not common in Deer Plain, IL.
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: 78.3 F
(+6.9 vs avg)
Average Low: 52.9 F
(+5.3 vs avg)
This month was significantly warmer than average.
Actual data from: KSET
Deer Plain, IL Daily Weather Averages for October
Recorded at St Charles Co Ap
(usw00053904),
5.7 miles
E of
Deer Plain, IL
| Day | Avg Temps (°F) | Precip (in) | Snow (in) | Degree Days (°F) | |||||
|---|---|---|---|---|---|---|---|---|---|
| Low | High | Mean | Month | Year | Month | Year | Heat | Cool | |
| 10/1 | 51 F | 76 F | 64 F | 0.09" | 31.33" | N/A | N/A | 4.1 F | 2.7 F |
| 10/2 | 51 F | 75 F | 63 F | 0.17" | 31.41" | N/A | N/A | 4.3 F | 2.5 F |
| 10/3 | 51 F | 75 F | 63 F | 0.25" | 31.49" | N/A | N/A | 4.6 F | 2.3 F |
| 10/4 | 50 F | 75 F | 62 F | 0.34" | 31.58" | N/A | N/A | 4.8 F | 2.2 F |
| 10/5 | 50 F | 74 F | 62 F | 0.42" | 31.66" | N/A | N/A | 5.1 F | 2.1 F |
| 10/6 | 50 F | 74 F | 62 F | 0.50" | 31.74" | N/A | N/A | 5.4 F | 2 F |
| 10/7 | 49 F | 73 F | 61 F | 0.58" | 31.82" | N/A | N/A | 5.7 F | 1.9 F |
| 10/8 | 49 F | 73 F | 61 F | 0.66" | 31.90" | N/A | N/A | 6 F | 1.8 F |
| 10/9 | 49 F | 72 F | 60 F | 0.75" | 31.99" | N/A | N/A | 6.2 F | 1.7 F |
| 10/10 | 48 F | 72 F | 60 F | 0.83" | 32.07" | N/A | N/A | 6.5 F | 1.6 F |
| 10/11 | 48 F | 72 F | 60 F | 0.92" | 32.16" | N/A | N/A | 6.8 F | 1.4 F |
| 10/12 | 47 F | 71 F | 59 F | 1.00" | 32.24" | N/A | N/A | 7 F | 1.2 F |
| 10/13 | 47 F | 71 F | 59 F | 1.10" | 32.34" | N/A | N/A | 7.2 F | 1.1 F |
| 10/14 | 47 F | 70 F | 59 F | 1.18" | 32.42" | N/A | N/A | 7.5 F | 1 F |
| 10/15 | 46 F | 70 F | 58 F | 1.28" | 32.52" | N/A | N/A | 7.8 F | 0.9 F |
| 10/16 | 46 F | 69 F | 58 F | 1.37" | 32.61" | N/A | N/A | 8.1 F | 0.8 F |
| 10/17 | 46 F | 69 F | 57 F | 1.46" | 32.70" | N/A | N/A | 8.5 F | 0.7 F |
| 10/18 | 45 F | 69 F | 57 F | 1.55" | 32.79" | N/A | N/A | 8.9 F | 0.7 F |
| 10/19 | 45 F | 68 F | 56 F | 1.64" | 32.88" | N/A | N/A | 9.2 F | 0.6 F |
| 10/20 | 44 F | 68 F | 56 F | 1.74" | 32.98" | N/A | N/A | 9.6 F | 0.6 F |
| 10/21 | 44 F | 67 F | 56 F | 1.83" | 33.07" | N/A | N/A | 10 F | 0.6 F |
| 10/22 | 44 F | 67 F | 55 F | 1.92" | 33.16" | N/A | N/A | 10.4 F | 0.6 F |
| 10/23 | 43 F | 66 F | 55 F | 2.01" | 33.25" | N/A | N/A | 10.8 F | 0.5 F |
| 10/24 | 43 F | 66 F | 54 F | 2.10" | 33.34" | N/A | N/A | 11.2 F | 0.5 F |
| 10/25 | 42 F | 65 F | 54 F | 2.18" | 33.42" | N/A | N/A | 11.6 F | 0.4 F |
| 10/26 | 42 F | 65 F | 53 F | 2.26" | 33.50" | N/A | N/A | 11.9 F | 0.4 F |
| 10/27 | 42 F | 64 F | 53 F | 2.34" | 33.58" | N/A | N/A | 12.3 F | 0.3 F |
| 10/28 | 41 F | 64 F | 53 F | 2.42" | 33.66" | N/A | N/A | 12.7 F | 0.3 F |
| 10/29 | 41 F | 64 F | 52 F | 2.51" | 33.75" | N/A | N/A | 13.2 F | 0.3 F |
| 10/30 | 40 F | 63 F | 52 F | 2.58" | 33.82" | N/A | N/A | 13.6 F | 0.3 F |
| 10/31 | 40 F | 63 F | 51 F | 2.66" | 33.90" | N/A | N/A | 14 F | 0.2 F |
