That Dam Hill Marathon
Race Day Weather
Mild start, warming up gradually
Runners will face temperatures starting at 58°F and rising to 68°F. With a wind from the SE at 9 mph, humidity will be around 72%. Runners should consider adjusting their pace as the temperature increases and ensure proper hydration throughout the race.
Pace Calculator
Get forecast alerts for That Dam Hill Marathon
We'll text or email you when the forecast shifts — so you can adjust gear, pacing, and strategy. Max one per day.
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.