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What is Mason City, IL, Weather Like in October?
During the month of October, Mason City, IL,
has an average daytime high temperature of 66°F and an average overnight low temperature dropping to 43°F.
Around 3.33 inches of precipitation is received during the month,
with about 34.78 inches falling in a typical year.
As you might expect, snow is not common in the month of October.
Annually, Mason City receives around 10.00 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: 78.3 F
(+9.8 vs avg)
Average Low: 53.4 F
(+8.3 vs avg)
This month was significantly warmer than average.
Actual data from: MID_AU422
Mason City, IL Daily Weather Averages for October
Recorded at Mason City 4se
(usc00115413),
3.6 miles
SE of
Mason City, IL
| Day | Avg Temps (°F) | Precip (in) | Snow (in) | Degree Days (°F) | |||||
|---|---|---|---|---|---|---|---|---|---|
| Low | High | Mean | Month | Year | Month | Year | Heat | Cool | |
| 10/1 | 48 F | 73 F | 61 F | 0.09" | 31.54" | 0.00" | 10.00" | 5.8 F | 1.6 F |
| 10/2 | 48 F | 73 F | 60 F | 0.19" | 31.64" | 0.00" | 10.00" | 6.1 F | 1.5 F |
| 10/3 | 48 F | 72 F | 60 F | 0.29" | 31.74" | 0.00" | 10.00" | 6.4 F | 1.4 F |
| 10/4 | 47 F | 72 F | 60 F | 0.40" | 31.85" | 0.00" | 10.00" | 6.8 F | 1.3 F |
| 10/5 | 47 F | 71 F | 59 F | 0.50" | 31.95" | 0.00" | 10.00" | 7.1 F | 1.2 F |
| 10/6 | 47 F | 71 F | 59 F | 0.60" | 32.05" | 0.00" | 10.00" | 7.5 F | 1.2 F |
| 10/7 | 46 F | 70 F | 58 F | 0.69" | 32.14" | 0.00" | 10.00" | 7.8 F | 1.1 F |
| 10/8 | 46 F | 70 F | 58 F | 0.79" | 32.24" | 0.00" | 10.00" | 8.2 F | 1 F |
| 10/9 | 46 F | 69 F | 57 F | 0.89" | 32.34" | 0.00" | 10.00" | 8.5 F | 1 F |
| 10/10 | 45 F | 69 F | 57 F | 0.99" | 32.44" | 0.00" | 10.00" | 8.9 F | 0.9 F |
| 10/11 | 45 F | 68 F | 57 F | 1.10" | 32.55" | 0.00" | 10.00" | 9.2 F | 0.8 F |
| 10/12 | 45 F | 68 F | 56 F | 1.20" | 32.65" | 0.00" | 10.00" | 9.5 F | 0.7 F |
| 10/13 | 44 F | 67 F | 56 F | 1.30" | 32.75" | 0.00" | 10.00" | 9.9 F | 0.6 F |
| 10/14 | 44 F | 67 F | 55 F | 1.41" | 32.86" | 0.00" | 10.00" | 10.2 F | 0.5 F |
| 10/15 | 43 F | 66 F | 55 F | 1.52" | 32.97" | 0.00" | 10.00" | 10.6 F | 0.4 F |
| 10/16 | 43 F | 66 F | 54 F | 1.63" | 33.08" | 0.00" | 10.00" | 11 F | 0.4 F |
| 10/17 | 43 F | 65 F | 54 F | 1.75" | 33.20" | 0.00" | 10.00" | 11.3 F | 0.3 F |
| 10/18 | 42 F | 65 F | 54 F | 1.87" | 33.32" | 0.00" | 10.00" | 11.7 F | 0.3 F |
| 10/19 | 42 F | 64 F | 53 F | 1.98" | 33.43" | 0.00" | 10.00" | 12.2 F | 0.3 F |
| 10/20 | 42 F | 64 F | 53 F | 2.09" | 33.54" | 0.00" | 10.00" | 12.6 F | 0.2 F |
| 10/21 | 41 F | 63 F | 52 F | 2.20" | 33.65" | 0.00" | 10.00" | 13 F | 0.2 F |
| 10/22 | 41 F | 63 F | 52 F | 2.31" | 33.76" | 0.00" | 10.00" | 13.4 F | 0.2 F |
| 10/23 | 40 F | 62 F | 51 F | 2.42" | 33.87" | 0.00" | 10.00" | 13.8 F | 0.1 F |
| 10/24 | 40 F | 62 F | 51 F | 2.53" | 33.98" | 0.00" | 10.00" | 14.2 F | 0.1 F |
| 10/25 | 40 F | 61 F | 50 F | 2.64" | 34.09" | 0.00" | 10.00" | 14.7 F | 0.1 F |
| 10/26 | 39 F | 61 F | 50 F | 2.75" | 34.20" | 0.00" | 10.00" | 15.1 F | 0.1 F |
| 10/27 | 39 F | 60 F | 50 F | 2.87" | 34.32" | 0.00" | 10.00" | 15.6 F | 0.1 F |
| 10/28 | 38 F | 60 F | 49 F | 2.98" | 34.43" | 0.00" | 10.00" | 16 F | 0.1 F |
| 10/29 | 38 F | 59 F | 49 F | 3.10" | 34.55" | 0.00" | 10.00" | 16.5 F | 0.1 F |
| 10/30 | 37 F | 59 F | 48 F | 3.22" | 34.67" | 0.00" | 10.00" | 16.9 F | 0.1 F |
| 10/31 | 37 F | 58 F | 48 F | 3.33" | 34.78" | 0.00" | 10.00" | 17.4 F | 0.1 F |
