Weather in Chicago, Illinois for October 2025
Until now, October 2025 in Chicago has been nearly identical to the historical average, with a temperature of 17.9 °F (showing only a slight deviation of -0.4 °F).
Expect cooler weather in the next days in Chicago with the forecast suggesting a temperature of 11.2 °F, lower than the historical average.
In general, the average temperature in Chicago at the beginning of October is 21.9 °F. As the month progressed, temperatures tended to significantly cool down, reaching an average of 14 °F by the end of October.
Chicago in October brings notable rainfall, with an average of 16 rainy days and a total precipitation of 120.3 mm.
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Chicago Weather October
Temperatures trend during October in Chicago
October weather in Chicago day by day
| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| Oct. 1 |  Overcast | 22° /15° | 0 mm | 5 | |
| Oct. 2 |  Sunny | 22° /15° | 0.7 mm | 6 | |
| Oct. 3 |  Partly cloudy | 24° /15° | 3.7 mm | 6 | |
| Oct. 4 |  Moderate rain at times | 23° /16° | 2.7 mm | 6 | |
| Oct. 5 |  Cloudy | 24° /16° | 8.1 mm | 5 | |
| Oct. 6 |  Patchy rain possible | 22° /14° | 4.2 mm | 5 | |
| Oct. 7 | Moderate or heavy rain shower | 16° /11° | 4.4 mm | 4 | |
| Oct. 8 | Partly cloudy | 17° /11° | 0.4 mm | 5 | |
| Oct. 9 | Sunny | 19° /11° | 0.1 mm | 5 | |
| Oct. 10 | Sunny | 19° /12° | 0 mm | 5 | |
| Oct. 11 | Moderate or heavy rain shower | 21° /13° | 7.1 mm | 5 | |
| Oct. 12 | Moderate or heavy rain shower | 19° /13° | 6 mm | 4 | |
| Oct. 13 | Overcast | 17° /11° | 13.2 mm | 4 | |
| Oct. 14 | Moderate or heavy rain shower | 15° /11° | 9.4 mm | 3 | |
| Oct. 15 | Moderate or heavy rain shower | 14° /9° | 12.1 mm | 3 | |
| Oct. 16 | Overcast | 15° /8° | 0.1 mm | 4 | |
| Oct. 17 | Overcast | 16° /7° | 0.2 mm | 4 | |
| Oct. 18 | Sunny | 19° /8° | 0 mm | 5 | |
| Oct. 19 | Sunny | 17° /9° | 5.8 mm | 4 | |
| Oct. 20 | Sunny | 19° /9° | 0.2 mm | 5 | |
| Oct. 21 | Overcast | 18° /10° | 0.6 mm | 4 | |
| Oct. 22 | Overcast | 16° /9° | 0 mm | 4 | |
| Oct. 23 | Partly cloudy | 17° /9° | 0 mm | 4 | |
| Oct. 24 | Sunny | 17° /10° | 8.3 mm | 5 | |
| Oct. 25 |  Heavy rain at times | 16° /10° | 12.2 mm | 4 | |
| Oct. 26 | Overcast | 15° /11° | 1 mm | 4 | |
| Oct. 27 | Partly cloudy | 15° /9° | 1.2 mm | 4 | |
| Oct. 28 | Overcast | 14° /7° | 3.5 mm | 4 | |
| Oct. 29 | Partly cloudy | 13° /9° | 0 mm | 0.6 | |
| Oct. 30 | Overcast | 10° /8° | 0 mm | 0.6 | |
| Oct. 31 | Cloudy | 15° /6° | 0 mm | 0.4 | |
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Chicago in October - FAQ
October rainfall patterns in Chicago
UV exposure in Chicago during October
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