Chicago, Illinois
Chicago is usually warm and urban, with Lake Michigan wind and heat as the main checks.
Typical race window
Monthly climate normal from 2016-2025 archive data.
19°C-27°C
21 km/h
42 km/h
38%
A typical day in August averages 3.4 mm of precipitation, with average gusts around 36 km/h. Treat this as planning context, not a live forecast.
Jan
0°C
Feb
3°C
Mar
8°C
Apr
13°C
May
19°C
Jun
25°C
Jul
27°C
Aug
27°C
Sep
24°C
Oct
17°C
Nov
9°C
Dec
3°C
Lake Michigan can be calm or choppy depending on wind direction and local conditions.
Urban roads make wind, wet surfaces and visibility relevant for handling.
Heat and humidity can build quickly on the lakefront run.
Live race-day forecast
This race page stays evergreen. For date, start time and expected segment durations, open the race-day planner with Chicago, Illinois prefilled.