Chicago Weather in October
United States · Humid Continental climate · Data averaged from 2020-01-01 to 2024-12-31 (5 years)
October in Chicago sees average temperatures ranging from a low of 9.0°C (48.2°F) to a high of 17.0°C (62.6°F), with a mean of 12.9°C (55.2°F). Compared to the annual average of 10.9°C (51.6°F), this month is 2.0°C warmer than the yearly norm. Precipitation averages 115.0mm, making it approximately 21.0mm wetter than the monthly average of 94.0mm. The city receives an average of 7.8 hours of sunshine per day during October, with relative humidity averaging 71.0%. Wind speeds reach an average maximum of 26.8 km/h. Snowfall averages 0.6cm during October, which can affect travel plans and outdoor activities. For travelers, this month offers a temperature experience in Chicago, with wetter-than-average conditions compared to the rest of the year.
There's something about Chicago in January that reveals the city's true character. I visited during the polar vortex — minus 25°C, Lake Michigan frozen at the edges, and the locals still walked to their neighborhood taverns as if nothing was unusual. The cultural calendar thrives in winter: theaters full, restaurants cozy, museums uncrowded. Summer (June-August) is when Chicago reclaims its lakefront — 25°C, festivals every weekend, the energy electric. I love October: 14°C, the city in autumn colors, and a melancholy knowing winter is coming. Each season reveals a different Chicago.
October vs Adjacent Months
| Metric | September | October | November |
|---|---|---|---|
| Mean Temp | 19.6°C (67.3°F) | 12.9°C (55.2°F) | 6.2°C (43.2°F) |
| Rainfall | 98.2mm | 115.0mm | 49.0mm |
| Sunshine | 9.6 hrs | 7.8 hrs | 6.4 hrs |
| Humidity | 71.9% | 71.0% | 71.7% |
| Wind | 23.6 km/h | 26.8 km/h | 26.4 km/h |
| Rainy Days | 12.4 | 15.6 | 9.4 |
| Snowfall | 0.0 cm | 0.6 cm | 3.5 cm |
Seasonal Context
October falls in Autumn in the Northern Hemisphere. Autumn sees temperatures gradually cooling from summer highs. For travelers visiting Chicago in October, the data indicates mixed conditions based on the combination of temperature, precipitation, and daylight hours.
Frequently Asked Questions
What is the average temperature in Chicago in October?
The average temperature in Chicago during October ranges from 9.0°C (48.2°F) to 17.0°C (62.6°F), with a mean of 12.9°C (55.2°F).
How much does it rain in Chicago in October?
Chicago receives an average of 115.0mm of precipitation in October, spread across approximately 15.6 rainy days.
What should I pack for Chicago in October?
Based on October weather data, pack warm layers, a medium jacket, and waterproof outerwear. Rain gear is essential — this month averages 115.0mm of precipitation.
Is October a good time to visit Chicago?
October is a cooler month, suitable for travelers who prefer mild weather and fewer crowds. Pack warm layers and enjoy indoor attractions.
Other Months for Chicago
Cities with Similar October Climate (Humid Continental)
Data Source: Open-Meteo historical archive (2020-01-01 to 2024-12-31). Daily measurements aggregated into monthly climate normals. Coordinates: 41.88°, -87.63°. Timezone: America/Chicago. Last updated: 2026-07-30.