Historical Race Day Weather for the Chicago Marathon

October 12, 2025

Race day snapshot

Partially cloudy

Start Line Conditions

Start Temp 50°F 10°C

Start Humidity 85% Humidity

Wind ESE 3 mph Wind

Race day high 63°F 17°C

Race day low 49°F 9°C

PR Score 99.42 Normal score 99.76

Course Score 99.76 Course-only Score

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October 13, 2024

Race day snapshot

Overcast

Start Line Conditions

Start Temp 59°F 15°C

Start Humidity 77% Humidity

Wind NNW 7 mph Wind

Race day high 65°F 18°C

Race day low 49°F 9°C

PR Score 98.65 Normal score 99.76

Course Score 99.76 Course-only Score

October 8, 2023

Race day snapshot

Partially cloudy

Start Line Conditions

Start Temp 46°F 8°C

Start Humidity 68% Humidity

Wind WNW 7 mph Wind

Race day high 54°F 12°C

Race day low 44°F 7°C

PR Score 99.76 Normal score 99.76

Course Score 99.76 Course-only Score

October 9, 2022

Race day snapshot

Clear

Start Line Conditions

Start Temp 45°F 7°C

Start Humidity 60% Humidity

Wind WSW 13 mph Wind

Race day high 67°F 19°C

Race day low 44°F 7°C

PR Score 99.76 Normal score 99.76

Course Score 99.76 Course-only Score

October 10, 2021

Race day snapshot

Mostly Cloudy

Start Line Conditions

Start Temp 68°F 20°C

Start Humidity 84% Humidity

Wind S 15 mph Wind

Race day high 79°F 26°C

Race day low 68°F 20°C

PR Score 94.96 Normal score 99.76

Course Score 99.76 Course-only Score

October 13, 2019

Race day snapshot

Partly Cloudy

Start Line Conditions

Start Temp 41°F 5°C

Start Humidity 91% Humidity

Wind WSW 10 mph Wind

Race day high 53°F 12°C

Race day low 39°F 4°C

PR Score 99.76 Normal score 99.76

Course Score 99.76 Course-only Score

Live Forecast Tool

Want course-specific race day conditions?

Use the weather tracker to see how temperatures, headwinds, and tailwinds could change across the course based on your goal time and start setup.

Open 2026 Chicago Marathon Weather Tracker

October 7, 2018

Race day snapshot

Drizzle

Start Line Conditions

Start Temp 58°F 14°C

Start Humidity 94% Humidity

Wind ENE 5 mph Wind

Race day high 64°F 18°C

Race day low 57°F 14°C

PR Score 97.92 Normal score 99.76

Course Score 99.76 Course-only Score

October 8, 2017

Race day snapshot

Partly Cloudy

Start Line Conditions

Start Temp 57°F 14°C

Start Humidity 86% Humidity

Wind SW 8 mph Wind

Race day high 73°F 23°C

Race day low 56°F 13°C

PR Score 98.25 Normal score 99.76

Course Score 99.76 Course-only Score

October 9, 2016

Race day snapshot

Partly Cloudy

Start Line Conditions

Start Temp 51°F 11°C

Start Humidity 80% Humidity

Wind ESE 8 mph Wind

Race day high 63°F 17°C

Race day low 50°F 10°C

PR Score 99.76 Normal score 99.76

Course Score 99.76 Course-only Score

October 11, 2015

Race day snapshot

Clear

Start Line Conditions

Start Temp 54°F 12°C

Start Humidity 70% Humidity

Wind SSW 11 mph Wind

Race day high 78°F 26°C

Race day low 54°F 12°C

PR Score 99.04 Normal score 99.76

Course Score 99.76 Course-only Score

October 12, 2014

Race day snapshot

Partly Cloudy

Start Line Conditions

Start Temp 46°F 8°C

Start Humidity 70% Humidity

Wind SE 8 mph Wind

Race day high 64°F 18°C

Race day low 45°F 7°C

PR Score 99.76 Normal score 99.76

Course Score 99.76 Course-only Score

October 13, 2013

Race day snapshot

Clear

Start Line Conditions

Start Temp 48°F 9°C

Start Humidity 72% Humidity

Wind NW 4 mph Wind

Race day high 65°F 18°C

Race day low 46°F 8°C

PR Score 99.71 Normal score 99.76

Course Score 99.76 Course-only Score

October 7, 2012

Race day snapshot

Mostly Cloudy

Start Line Conditions

Start Temp 40°F 4°C

Start Humidity 64% Humidity

Wind WNW 6 mph Wind

Race day high 51°F 11°C

Race day low 38°F 3°C

PR Score 99.76 Normal score 99.76

Course Score 99.76 Course-only Score

October 9, 2011

Race day snapshot

Clear

Start Line Conditions

Start Temp 59°F 15°C

Start Humidity 69% Humidity

Wind ESE 3 mph Wind

Race day high 80°F 27°C

Race day low 57°F 14°C

PR Score 97.95 Normal score 99.76

Course Score 99.76 Course-only Score

October 10, 2010

Race day snapshot

Scattered Clouds

Start Line Conditions

Start Temp 60°F 16°C

Start Humidity 69% Humidity

Wind No Wind Wind

Race day high 84°F 29°C

Race day low 59°F 15°C

PR Score 98.05 Normal score 99.76

Course Score 99.76 Course-only Score

2009

Race day snapshot

Mostly Cloudy

Start Line Conditions

Start Temp 32°F 0°C

Start Humidity 67% Humidity

Wind NW 7 mph Wind

Race day high 45°F 7°C

Race day low 28°F -2°C

PR Score 99.76 Normal score 99.76

Course Score 99.76 Course-only Score

2008

Race day snapshot

Mostly Cloudy

Start Line Conditions

Start Temp 64°F 18°C

Start Humidity 75% Humidity

Wind SSE 5 mph Wind

Race day high 86°F 30°C

Race day low 63°F 17°C

PR Score 97.29 Normal score 99.76

Course Score 99.76 Course-only Score

2007

Race day snapshot

Mostly Cloudy

Start Line Conditions

Start Temp 72°F 22°C

Start Humidity 79% Humidity

Wind SSW 5 mph Wind

Race day high 88°F 31°C

Race day low 71°F 22°C

PR Score 93.82 Normal score 99.76

Course Score 99.76 Course-only Score

2006

Race day snapshot

Overcast

Start Line Conditions

Start Temp 40°F 4°C

Start Humidity 84% Humidity

Wind WNW 14 mph Wind

Race day high 48°F 9°C

Race day low 36°F 2°C

PR Score 99.76 Normal score 99.76

Course Score 99.76 Course-only Score

2005

Race day snapshot

Mostly Cloudy

Start Line Conditions

Start Temp 51°F 11°C

Start Humidity 72% Humidity

Wind ENE 7 mph Wind

Race day high 59°F 15°C

Race day low 50°F 10°C

PR Score 99.76 Normal score 99.76

Course Score 99.76 Course-only Score

2004

Race day snapshot

Partly Cloudy

Start Line Conditions

Start Temp 47°F 8°C

Start Humidity 88% Humidity

Wind N 1 mph Wind

Race day high 61°F 16°C

Race day low 45°F 7°C

PR Score 99.76 Normal score 99.76

Course Score 99.76 Course-only Score

2003

Race day snapshot

Sunny

Start Line Conditions

Start Temp 47°F 8°C

Start Humidity 92% Humidity

Wind WSW 7 mph Wind

Race day high 70°F 21°C

Race day low 47°F 8°C

PR Score 99.76 Normal score 99.76

Course Score 99.76 Course-only Score