Fox Valley Marathon

St. Charles, IL, USA · September 20, 2026

60°·77° high·Light·Dry

Weather

Race Day Weather

60°at start

78° high

Light

Dry

Warm day, adjust pace wisely

Runners will face a temperature trend from 60°F at the start to a high of 78°F. With a max wind of 7 mph from the S and an average humidity of 71%, hydration will be crucial. It's advisable to start conservatively to manage the rising heat and humidity throughout the race.

Race day forecast available in 51 days

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Distance: 26.2mi

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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

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Course Map

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

The forecast calls for a high of 76°F and a low of 57°F with a 8% chance of rain.

Historical Weather

Based on 15 years of data

Avg Temp

73°F

L:59° H:74°

RunScore

Conditions

Rain Freq

27%

4 of 15 yrs

Wind7mph

Dew57°F

Temperature History

Range of temperatures during race hours for each year.

Detailed History

Year	Low / High	Rain	Dew Point
2025 Fox Valley Marathon Clearing in the afternoon with late afternoon rain. 2025	66°/79°	-	65°
2024 Fox Valley Marathon Partly cloudy throughout the day with rain in the morning and afternoon. 2024	67°/72°	Light	66°
2023 Fox Valley Marathon Partly cloudy throughout the day with a chance of rain throughout the day. 2023	59°/64°	Light	58°
2022 Fox Valley Marathon Partly cloudy throughout the day with late afternoon rain. 2022	69°/82°	-	64°
2021 Fox Valley Marathon Clear conditions throughout the day. 2021	59°/89°	-	63°
2019 Fox Valley Marathon Partly cloudy throughout the day with a chance of rain throughout the day. 2019	72°/78°	Light	67°
2018 Fox Valley Marathon Clear conditions throughout the day. 2018	65°/88°	-	68°
2017 Fox Valley Marathon Partly cloudy throughout the day. 2017	67°/83°	-	65°
2016 Fox Valley Marathon Clear conditions throughout the day. 2016	55°/76°	-	55°
2015 Fox Valley Marathon Clear conditions throughout the day. 2015	48°/70°	-	49°
2014 Fox Valley Marathon Partly cloudy throughout the day with early morning rain. 2014	55°/63°	-	51°
2013 Fox Valley Marathon Clear conditions throughout the day. 2013	43°/66°	-	46°
2012 Fox Valley Marathon Clear conditions throughout the day. 2012	47°/75°	-	47°
2011 Fox Valley Marathon Cloudy skies throughout the day with rain. 2011	54°/59°	Light	53°
2010 Fox Valley Marathon Partly cloudy throughout the day with early morning rain. 2010	53°/67°	-	51°