That Dam Hill Marathon

London, ON, Canada · September 19, 2026
clear-day58°·74° high·Light·Dry
8
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Race Day Weather

clear-day
58°at start
75° high
Light
Dry

Cool morning, warming afternoon

Runners will face a start-line temperature of 56°F, rising to 75°F by the finish. With an average humidity of 71% and a gentle wind from the SSE at 8 mph, hydration will be crucial. As temperatures climb, runners should consider pacing conservatively to manage the heat in the later stages.

Race day forecast available in 132 days
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Distance: 26.2mi
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Race Info

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.

Area Map

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