Monthly climate guide
Chicago weather in October
With highs near 15°C (60°F) and lows around 10°C (49°F), October feels mild in Chicago. Rainfall averages about 107 mm (wet) and the sky is often cloudy. Daytime highs are 7°C cooler than September and 7°C warmer than November.
What stands out in October
- Check the hourly forecast before heading to Millennium Park — showers are likely.
- Just 270 km apart, but Chicago runs about 3°C cooler than Indianapolis this month.
- In Chicago, October is mid-autumn.
- It cools down fast from here: November is about 7°C cooler.
Avg high
15°C
60°F
Avg low
10°C
49°F
Rainfall
107 mm
wet
Humidity
78%
relative
Sky
59%
cloud · often cloudy
Chicago weather by month
Show the monthly averages as a table
| Month | Avg high | Avg low | Rain | Humidity | Cloud cover |
|---|---|---|---|---|---|
| January | 0°C / 31°F | -5°C / 22°F | 48 mm | 86% | 70% |
| February | 0°C / 32°F | -6°C / 22°F | 61 mm | 85% | 71% |
| March | 5°C / 40°F | -1°C / 30°F | 57 mm | 82% | 65% |
| April | 10°C / 49°F | 3°C / 38°F | 108 mm | 81% | 65% |
| May | 15°C / 60°F | 9°C / 49°F | 129 mm | 83% | 65% |
| June | 21°C / 70°F | 15°C / 59°F | 113 mm | 82% | 57% |
| July | 25°C / 77°F | 20°C / 68°F | 93 mm | 79% | 47% |
| August | 25°C / 77°F | 20°C / 68°F | 95 mm | 76% | 46% |
| September | 22°C / 72°F | 17°C / 62°F | 85 mm | 77% | 48% |
| October | 15°C / 60°F | 10°C / 49°F | 107 mm | 78% | 59% |
| November | 8°C / 47°F | 3°C / 37°F | 59 mm | 80% | 63% |
| December | 3°C / 38°F | -1°C / 30°F | 53 mm | 85% | 73% |
What to pack for October
- A warm sweater or fleece for layering
- A mid-weight jacket
- A compact umbrella or packable rain jacket
- Water-resistant shoes
Is October a good time to visit Chicago?
Our Chicago guide recommends: May to June or September to October, avoiding the bitter winter cold and the most humid days of summer.
A river or lake architecture boat tour is one of the best ways to see the skyline that made Chicago famous for its buildings.
Best time to visit Chicago →Other United States cities in October
Cite or embed this data
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Chicago weather in October. WeatherCompare, 2026 (NASA POWER / ERA5, 2011–2020 monthly averages). https://weathercompare.eu/weather/usa/chicago/october
<a href="https://weathercompare.eu/weather/usa/chicago/october">Chicago weather in October</a> (WeatherCompare)
<iframe src="https://weathercompare.eu/embed/usa/chicago" width="300" height="160" style="border:0;border-radius:12px" loading="lazy" title="Chicago weather in October"></iframe> <p style="font-size:12px"><a href="https://weathercompare.eu/weather/usa/chicago/october">Chicago weather in October</a> – WeatherCompare</p>
Chicago in October: quick answers
Is October a good time to visit Chicago?
October is one of the wetter months in Chicago, with about 107 mm of rain. You can still go: pack a rain jacket and keep plans flexible.
How warm is Chicago in October?
Average highs are about 15°C (60°F) and average lows about 10°C (49°F), based on 10 years of daily data.
Does it rain a lot in Chicago in October?
Chicago typically gets around 107 mm of rain in October — wet.
When is the best time to visit Chicago?
May to June or September to October, avoiding the bitter winter cold and the most humid days of summer.
Figures are long-term averages for the area around Chicago (NASA POWER / ERA5, 2011–2020), not a forecast for a specific year. For upcoming days, see the live multi-source forecast.