RaceDayCast

Bank of America Chicago Marathon 2026

Marathon · 11 October 2026 · Chicago, USA

Race-day weather and a pacing plan for the Bank of America Chicago Marathon: see how the hills, the wind, the heat and running in a group change your finish time – and what pace to run, kilometre by kilometre.

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Pick your goal time and get your plan in seconds.

Elevation profile

Typical race-day weather

Typical race-day weather (2016–2025, ±5 days around 11 October): 14 °C on average during the race (most years 10–19 °C, almost all 7–20 °C). Humidity 78 %, wind about 6 m/s, most often from the south. Rain in 17 % of race hours. This is history, not a forecast.

Questions about the Bank of America Chicago Marathon

How hilly is the Bank of America Chicago Marathon?

About 64 m of climbing and 63 m of descent – flat. 97 % of the course is within ±2 %, and none of it is steeper than 6 %. No climbs of 10 m or more.

How much will the conditions slow me down?

It depends on your pace, the course and the weather on the day. RaceDayCast adds up the effect of hills, wind (including shelter from buildings), heat and running in a group – kilometre by kilometre – and shows how much each of them costs or gives you. Choose your goal time to see your own plan.

When can I see the race-day forecast?

The forecast from MET Norway is available about 9 days before the race, and on race day we switch to observed weather as the hours pass. Until then the plan uses the typical weather for the date.

What pace should I run to reach my goal time?

Not the same pace all the way. Run an even effort: a little slower uphill and into the wind, a little faster downhill and with the wind behind you. Your RaceDayCast plan gives you the split for every kilometre or mile.

Open the pacing plan →

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