That Dam Hill Marathon

London, ON, Canada · September 19, 2026
partly-cloudy-day58°·67° high·Breezy·Dry
9
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Race Day Weather

partly-cloudy-day
58°at start
68° high
Breezy
Dry

Cool start, gradual warmth

Runners will face a starting temperature of 58°F, rising to 68°F by the finish. Wind will be light from the SE at 9 mph, with gusts up to 17 mph. With humidity at 72%, it's advisable to start conservatively and hydrate frequently, especially as temperatures climb.

Race day forecast available in 5 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.

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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 70°F and a low of 58°F with a 7% 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 That Dam Hill Marathon

Partly cloudy throughout the day.

2025
clear-day
54°/73°-
7

2024 That Dam Hill Marathon

Partly cloudy throughout the day with rain clearing later.

2024
partly-cloudy-day
63°/82°-
8

2023 That Dam Hill Marathon

Partly cloudy throughout the day.

2023
clear-day
48°/69°-
8

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