Your favorites:
What is Island Lake, IL, Weather Like in October?
During the month of October, Island Lake, IL,
has an average daytime high temperature of 64°F and an average overnight low temperature dropping to 40°F.
Around 3.21 inches of precipitation is received during the month,
with about 32.65 inches falling in a typical year.
0.10 inches of snow is the mean amount received during October.
Annually, Island Lake receives around 24.90 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
(+4.4 vs avg)
Average Low: 50.5 F
(+9.2 vs avg)
This month was significantly warmer than average.
Actual data from: MID_IMC04
Island Lake, IL Daily Weather Averages for October
Recorded at Mc Henry -wg Stratton L&d
(usc00115493),
3.9 miles
NW of
Island Lake, IL
| Day | Avg Temps (°F) | Precip (in) | Snow (in) | Degree Days (°F) | |||||
|---|---|---|---|---|---|---|---|---|---|
| Low | High | Mean | Month | Year | Month | Year | Heat | Cool | |
| 10/1 | 45 F | 70 F | 58 F | 0.11" | 29.55" | 0.00" | 24.80" | 8.3 F | 0.8 F |
| 10/2 | 45 F | 70 F | 57 F | 0.21" | 29.65" | 0.00" | 24.80" | 8.7 F | 0.7 F |
| 10/3 | 44 F | 69 F | 57 F | 0.32" | 29.76" | 0.00" | 24.80" | 9 F | 0.7 F |
| 10/4 | 44 F | 69 F | 56 F | 0.43" | 29.87" | 0.00" | 24.80" | 9.4 F | 0.6 F |
| 10/5 | 44 F | 68 F | 56 F | 0.54" | 29.98" | 0.00" | 24.80" | 9.8 F | 0.6 F |
| 10/6 | 43 F | 68 F | 55 F | 0.64" | 30.08" | 0.00" | 24.80" | 10.2 F | 0.6 F |
| 10/7 | 43 F | 67 F | 55 F | 0.74" | 30.18" | 0.00" | 24.80" | 10.6 F | 0.5 F |
| 10/8 | 42 F | 67 F | 55 F | 0.83" | 30.27" | 0.00" | 24.80" | 10.9 F | 0.5 F |
| 10/9 | 42 F | 66 F | 54 F | 0.94" | 30.38" | 0.00" | 24.80" | 11.3 F | 0.5 F |
| 10/10 | 42 F | 66 F | 54 F | 1.05" | 30.49" | 0.00" | 24.80" | 11.7 F | 0.4 F |
| 10/11 | 41 F | 65 F | 53 F | 1.15" | 30.59" | 0.00" | 24.80" | 12.1 F | 0.4 F |
| 10/12 | 41 F | 65 F | 53 F | 1.26" | 30.70" | 0.00" | 24.80" | 12.4 F | 0.4 F |
| 10/13 | 41 F | 65 F | 53 F | 1.36" | 30.80" | 0.00" | 24.80" | 12.8 F | 0.3 F |
| 10/14 | 40 F | 64 F | 52 F | 1.46" | 30.90" | 0.00" | 24.80" | 13.2 F | 0.3 F |
| 10/15 | 40 F | 64 F | 52 F | 1.56" | 31.00" | 0.00" | 24.80" | 13.6 F | 0.2 F |
| 10/16 | 40 F | 63 F | 51 F | 1.67" | 31.11" | 0.00" | 24.80" | 13.9 F | 0.2 F |
| 10/17 | 39 F | 63 F | 51 F | 1.77" | 31.21" | 0.00" | 24.80" | 14.3 F | 0.2 F |
| 10/18 | 39 F | 62 F | 51 F | 1.87" | 31.31" | 0.00" | 24.80" | 14.7 F | 0.1 F |
| 10/19 | 39 F | 62 F | 50 F | 1.97" | 31.41" | 0.00" | 24.80" | 15.1 F | 0.1 F |
| 10/20 | 38 F | 61 F | 50 F | 2.07" | 31.51" | 0.00" | 24.80" | 15.5 F | 0.1 F |
| 10/21 | 38 F | 61 F | 49 F | 2.18" | 31.62" | 0.00" | 24.80" | 15.9 F | 0.1 F |
| 10/22 | 38 F | 60 F | 49 F | 2.28" | 31.72" | 0.00" | 24.80" | 16.3 F | 0.1 F |
| 10/23 | 37 F | 60 F | 48 F | 2.38" | 31.82" | 0.00" | 24.80" | 16.6 F | 0.1 F |
| 10/24 | 37 F | 59 F | 48 F | 2.49" | 31.93" | 0.00" | 24.80" | 17 F | 0.1 F |
| 10/25 | 37 F | 59 F | 48 F | 2.59" | 32.03" | 0.00" | 24.80" | 17.4 F | 0.1 F |
| 10/26 | 36 F | 58 F | 47 F | 2.69" | 32.13" | 0.00" | 24.80" | 17.8 F | 0.1 F |
| 10/27 | 36 F | 58 F | 47 F | 2.80" | 32.24" | 0.10" | 24.90" | 18.2 F | N/A |
| 10/28 | 36 F | 57 F | 46 F | 2.91" | 32.35" | 0.10" | 24.90" | 18.6 F | N/A |
| 10/29 | 35 F | 57 F | 46 F | 3.01" | 32.45" | 0.10" | 24.90" | 19 F | N/A |
| 10/30 | 35 F | 56 F | 46 F | 3.11" | 32.55" | 0.10" | 24.90" | 19.4 F | N/A |
| 10/31 | 35 F | 56 F | 45 F | 3.21" | 32.65" | 0.10" | 24.90" | 19.8 F | N/A |
