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What is Darien, IL, Weather Like in October?
During the month of October, Darien, IL,
has an average daytime high temperature of 66°F and an average overnight low temperature dropping to 43°F.
Around 3.68 inches of precipitation is received during the month,
with about 36.26 inches falling in a typical year.
Snow is not common in Darien, IL.
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: 72.7 F
(+4.2 vs avg)
Average Low: 54.4 F
(+9.5 vs avg)
This month was significantly warmer than average.
Actual data from: MID_E7066
Darien, IL Daily Weather Averages for October
Recorded at Little Red School Hse
(usc00115110),
5.8 miles
ESE of
Darien, IL
| Day | Avg Temps (°F) | Precip (in) | Snow (in) | Degree Days (°F) | |||||
|---|---|---|---|---|---|---|---|---|---|
| Low | High | Mean | Month | Year | Month | Year | Heat | Cool | |
| 10/1 | 49 F | 74 F | 62 F | 0.12" | 32.70" | N/A | N/A | 4.8 F | 1.3 F |
| 10/2 | 49 F | 73 F | 61 F | 0.24" | 32.82" | N/A | N/A | 5.1 F | 1.1 F |
| 10/3 | 48 F | 73 F | 61 F | 0.36" | 32.94" | N/A | N/A | 5.5 F | 1 F |
| 10/4 | 48 F | 72 F | 60 F | 0.48" | 33.06" | N/A | N/A | 5.9 F | 0.9 F |
| 10/5 | 47 F | 72 F | 60 F | 0.60" | 33.18" | N/A | N/A | 6.3 F | 0.8 F |
| 10/6 | 47 F | 71 F | 59 F | 0.72" | 33.30" | N/A | N/A | 6.7 F | 0.8 F |
| 10/7 | 46 F | 71 F | 59 F | 0.84" | 33.42" | N/A | N/A | 7.2 F | 0.7 F |
| 10/8 | 46 F | 70 F | 58 F | 0.95" | 33.53" | N/A | N/A | 7.7 F | 0.7 F |
| 10/9 | 46 F | 69 F | 58 F | 1.08" | 33.66" | N/A | N/A | 8.1 F | 0.6 F |
| 10/10 | 45 F | 69 F | 57 F | 1.20" | 33.78" | N/A | N/A | 8.6 F | 0.6 F |
| 10/11 | 45 F | 68 F | 56 F | 1.33" | 33.91" | N/A | N/A | 9.1 F | 0.5 F |
| 10/12 | 44 F | 68 F | 56 F | 1.46" | 34.04" | N/A | N/A | 9.6 F | 0.5 F |
| 10/13 | 44 F | 67 F | 55 F | 1.59" | 34.17" | N/A | N/A | 10 F | 0.4 F |
| 10/14 | 43 F | 66 F | 55 F | 1.72" | 34.30" | N/A | N/A | 10.5 F | 0.4 F |
| 10/15 | 43 F | 66 F | 54 F | 1.84" | 34.42" | N/A | N/A | 11 F | 0.3 F |
| 10/16 | 42 F | 65 F | 54 F | 1.97" | 34.55" | N/A | N/A | 11.5 F | 0.3 F |
| 10/17 | 42 F | 65 F | 53 F | 2.09" | 34.67" | N/A | N/A | 12 F | 0.3 F |
| 10/18 | 42 F | 64 F | 53 F | 2.21" | 34.79" | N/A | N/A | 12.5 F | 0.2 F |
| 10/19 | 41 F | 63 F | 52 F | 2.33" | 34.91" | N/A | N/A | 13 F | 0.2 F |
| 10/20 | 41 F | 63 F | 52 F | 2.45" | 35.03" | N/A | N/A | 13.5 F | 0.2 F |
| 10/21 | 40 F | 62 F | 51 F | 2.56" | 35.14" | N/A | N/A | 14 F | 0.2 F |
| 10/22 | 40 F | 62 F | 51 F | 2.68" | 35.26" | N/A | N/A | 14.5 F | 0.2 F |
| 10/23 | 39 F | 61 F | 50 F | 2.79" | 35.37" | N/A | N/A | 15 F | 0.2 F |
| 10/24 | 39 F | 60 F | 50 F | 2.90" | 35.48" | N/A | N/A | 15.5 F | 0.2 F |
| 10/25 | 39 F | 60 F | 49 F | 3.02" | 35.60" | N/A | N/A | 16 F | 0.1 F |
| 10/26 | 38 F | 59 F | 49 F | 3.13" | 35.71" | N/A | N/A | 16.4 F | 0.1 F |
| 10/27 | 38 F | 59 F | 48 F | 3.24" | 35.82" | N/A | N/A | 16.9 F | 0.1 F |
| 10/28 | 37 F | 58 F | 48 F | 3.36" | 35.94" | N/A | N/A | 17.3 F | 0.1 F |
| 10/29 | 37 F | 58 F | 47 F | 3.47" | 36.05" | N/A | N/A | 17.8 F | 0.1 F |
| 10/30 | 37 F | 57 F | 47 F | 3.58" | 36.16" | N/A | N/A | 18.2 F | 0.1 F |
| 10/31 | 36 F | 57 F | 46 F | 3.68" | 36.26" | N/A | N/A | 18.7 F | 0.1 F |
