Weather in Chicago, Illinois for October 2026
So far, October 2026 in Chicago is slightly warmer than the historical average by 1.1 °C.
The forecast for the next days in Chicago predicts the temperature to be 19.9 °C, significantly warmer than the historical average.
In general, the average temperature in Chicago at the beginning of October is 21.2 °C. As the month progressed, temperatures tended to significantly cool down, reaching an average of 14 °C by the end of October.
Chicago experiences moderate rainfall in October, with an average of 9 rainy days and a total precipitation of 113.5 mm.
Is October a good time to visit Chicago? check out the best time to travel to Chicago page.
✨ Is October a good time to visit Chicago? – Ask the AI Weatherman
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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 |  Light rain | 22° /16° | 7.1 mm | 5 | |
| Oct. 2 |  Patchy rain possible | 21° /16° | 1.1 mm | 5 | |
| Oct. 3 | Light rain | 23° /15° | 3.1 mm | 5 | |
| Oct. 4 | Patchy rain possible | 23° /16° | 2.2 mm | 4.9 | |
| Oct. 5 | Light rain | 22° /15° | 6.7 mm | 4.8 | |
| Oct. 6 | Light rain | 22° /14° | 3.5 mm | 4.7 | |
| Oct. 7 | Light rain | 17° /12° | 3.7 mm | 4 | |
| Oct. 8 |  Partly cloudy | 17° /11° | 0.3 mm | 4 | |
| Oct. 9 |  Sunny | 19° /12° | 0.2 mm | 4.5 | |
| Oct. 10 | Sunny | 20° /13° | 0 mm | 4.4 | |
| Oct. 11 |  Moderate or heavy rain shower | 20° /13° | 5.9 mm | 4.3 | |
| Oct. 12 | Moderate or heavy rain shower | 20° /14° | 5 mm | 4 | |
| Oct. 13 |  Moderate rain | 18° /13° | 13.6 mm | 4 | |
| Oct. 14 | Moderate or heavy rain shower | 16° /12° | 9.8 mm | 3 | |
| Oct. 15 | Moderate rain | 14° /10° | 13.1 mm | 3 | |
| Oct. 16 |  Overcast | 15° /9° | 0.5 mm | 3 | |
| Oct. 17 | Partly cloudy | 15° /7° | 0.2 mm | 3.8 | |
| Oct. 18 | Sunny | 18° /8° | 0 mm | 3.8 | |
| Oct. 19 | Light rain | 16° /9° | 4.8 mm | 3.7 | |
| Oct. 20 | Sunny | 18° /9° | 0.2 mm | 3.6 | |
| Oct. 21 | Sunny | 18° /10° | 0.5 mm | 3.5 | |
| Oct. 22 | Overcast | 16° /10° | 0 mm | 3.5 | |
| Oct. 23 | Partly cloudy | 17° /10° | 0 mm | 3.4 | |
| Oct. 24 | Light rain | 17° /10° | 6.9 mm | 3.3 | |
| Oct. 25 | Overcast | 22° /12° | 0 mm | 2.7 | |
| Oct. 26 | Overcast | 17° /13° | 0 mm | 2.4 | |
| Oct. 27 | Overcast | 21° /12° | 0 mm | 2.1 | |
| Oct. 28 | Overcast | 22° /14° | 0 mm | 0.7 | |
| Oct. 29 | Patchy rain possible | 20° /14° | 1.5 mm | 5 | |
| Oct. 30 | Partly cloudy | 18° /13° | 0.1 mm | 5 | |
| Oct. 31 | Overcast | 19° /15° | 0.4 mm | 4 | |
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Chicago in October - FAQ
What are the expected maximum and minimum temperatures in Chicago during October?
How much rainfall should be expected in Chicago during October?
Will it snow in Chicago in October 2026?
What are the typical wind conditions in Chicago during October?
October rainfall patterns in Chicago
UV exposure in Chicago during October
Where is Chicago?Get accurate weather forecasts for Chicago, located at latitude 41.85 and longitude -87.65. Stay updated with localized weather information tailored for Chicago.