Fox Valley Marathon

St. Charles, IL, USA · September 20, 2026
partly-cloudy-day66°·75° high·Breezy·Rain possible
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Race Day Weather

partly-cloudy-day
66°at start
75° high
Breezy
Rain possible

Warm start, moderate wind, chance of rain, high humidity

Starting at 66°F, heat will be a factor from the gun — go out conservative and stay on top of hydration. Temperatures rising to 75°F through the course will gradually increase perceived effort in the second half. Moderate winds around 13mph may affect pacing on open sections of the course. There's a chance of rain, so have a backup gear plan ready. High humidity (85%) will make it harder to cool down through sweat — increase fluid intake accordingly.

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Distance: 26.2mi
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Race Plan

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Weather-adjusted pacing, per-mile terrain splits, fueling timeline with aid stations, packing checklist, carb tracker, spectator guide — all personalized to your goal and race-day conditions.

Race Conditions
Terrain Splits
Nutrition
Gear & Packing
T-Minus
Carb Tracker
Spectator Guide
Race Band

Race Info

Combining small race atmosphere with big race amenities, the Fox Valley Marathon, Half Marathon, and Fall Final 20 are ideal for both veterans looking for a fast race, as well as first timers looking for an uncrowded, supportive, family-friendly race setting. Starting and ending in historic downtown St Charles, IL, the course winds through picturesque Geneva, Batavia, North Aurora, and Aurora to a spectacular finish across the Fox River that can be seen from over a mile away. The course offers fantastic viewing spots for families and supporters, as well as frequent and well positioned aid stations that are staffed by the most supportive volunteer teams of any race you’ve run. Source

FAQ

When is the 2026 Fox Valley Marathon?

The 2026 Fox Valley Marathon will be held on Sunday September 20, 2026.

Is the Fox Valley Marathon a Boston Marathon Qualifier?

Yes, the Fox Valley Marathon is an official Boston Marathon qualifier.

What is the time limit for the Fox Valley Marathon?

The time limit for the Fox Valley Marathon is 6 hours.

What will the weather be like for the 2026 Fox Valley Marathon?

The forecast calls for a high of 75°F and a low of 65°F with a 38% chance of rain.

Historical Weather

Based on 15 years of data
Avg Temp
67°F
L:59° H:73°
RunScore
5
Conditions
Rain Freq
27%
4 of 15 yrs
Wind7mph
Dew58°F

Temperature History

Range of temperatures during race hours for each year.

Detailed History

YearConditionsLow / HighRainScoreResults
2025
partly-cloudy-day
66°/78°-
4
2024
partly-cloudy-day
67°/72°Light
4
2023
rain
59°/64°Light
6
2022
cloudy
69°/81°-
3
2021
clear-day
59°/86°-
4
2019
cloudy
72°/78°Light
3
2018
clear-day
65°/85°-
3
2017
partly-cloudy-day
67°/82°-
4
2016
clear-day
55°/75°-
5
2015
clear-day
48°/70°-
7
2014
clear-day
55°/63°-
7
2013
clear-day
43°/66°-
8
2012
clear-day
47°/75°-
7
2011
cloudy
54°/59°Light
8
2010
partly-cloudy-day
53°/67°-
7