That Dam Hill Marathon

London, ON, CanadaSeptember 19, 2026
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Race Day Weather

clear-day
56°
75° high
Light
Dry

Comfortable temps, big temp swing

Mild 56°F temps at gun time mean comfortable early miles without overheating risk. Temps will climb significantly to 75°F by later miles, so expect fading conditions as the race progresses. Light winds shouldn't be a major factor for pacing. Moderate humidity at 72% is worth noting for effort level, especially in later miles.

Race day forecast available in 152 days
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Pace Calculator

Distance: 26.2mi
0:00:00
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Common Goals:

That Dam Hill Marathon in London, Ontario, offers a certified Boston Marathon Qualifier course that is both spectator-friendly and ideal for setting personal bests. The event features a variety of race options, including a marathon, half marathon, and multiple timed ultra races, all set within the scenic Springbank Park. Organized by dedicated volunteers, the race supports cancer research, with all net proceeds benefiting the Dunn with Cancer charity. Source

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Course Map

FAQ

When is the 2026 That Dam Hill Marathon?

The 2026 That Dam Hill Marathon will be held on Saturday September 19, 2026.

What will the weather be like for the 2026 That Dam Hill Marathon?

The forecast calls for a high of 75°F and a low of 56°F with a 0% chance of rain.

Historical Weather

Based on 3 years of data
Avg Temp
75°F
L:55° H:75°
RunScore
8
Conditions
Rain Freq
0%
0 of 3 yrs
Wind7mph
Dew51°F

Temperature History

Range of temperatures during race hours for each year.

Detailed History

YearConditionsLow / HighRainScore
2025
clear-day
54°/73°-
7
2024
partly-cloudy-day
63°/82°-
8
2023
clear-day
48°/69°-
8