Weather: Chicago Marathon
Historical weather data for race day in October. Use this to plan your race strategy, clothing, and hydration.
🌡️
15°C
Temperature
Range: 11°C – 19°C
💧
65%
Humidity
Moderate
🌧️
30%
Rain Chance
Possible — check forecast
📅
October
Typical race month
Usually on a Sunday
📝 Conditions
Mid-October in Chicago typically brings mild, pleasant running conditions with cooler temperatures ideal for marathon pace. Occasional rain is possible, but the flat terrain and moderate temperatures make for favorable racing conditions.
👟 What to Wear
Singlet or short sleeve
Ideal racing temperatures
💧 Hydration Strategy
Before the Race
Normal hydration. Drink to thirst in the 24 hours before. Avoid over-hydrating.
During the Race
Drink at aid stations every 3-4km. Alternate water and sports drink.
After the Race
Rehydrate within 30 minutes of finishing. A drink with electrolytes and some protein helps recovery.
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