Legendary race

Chicago Marathon

Chicago, Illinois, United States

Usually heldOct

Set inChicago, Illinois, United States

In season~63°F high

Climate21–81°F

Fares from$120

Nearest airportORD

CurrencyUSD

LanguageEnglish

TimezoneUTC-05:00

On the map

Map showing the location of Chicago Marathon

Directions (Google Maps) →

Historical monthly weather

Sweet spotPeak Jun–Sep. Go in May, Oct for similar weather.

Sunny share of daylightAug · 54%

WarmestJul · 81°F

WettestOct

Best windowOct

Bar height is the typical daytime high; color shows sunny share of daylight. The shaded months are the ideal window to go.

Weather data & source

2018–2023 averages, not a forecast. Wet days estimate days with at least 1 mm of rain or snow using a calibrated ERA5 threshold. Contains modified Copernicus Climate Change Service information. Weather data by Open-Meteo.com (AWS Open Data, CC BY 4.0). Sunny share of daylight is calibrated from daytime cloud cover. ERA5 via Open-Meteo AWS Open Data

A lightning-fast loop through 29 neighborhoods along Lake Michigan.

When it's run

The Chicago Marathon is typically held in Oct, based on recent years. Exact dates and start waves move year to year, so confirm the official race calendar before you book.