ENDURrun Marathon
Race Day Weather
Warm start, steady rain ahead
Runners will face a warm start at 66°F, rising to 73°F during the race, with high humidity at 89% and a dew point of 67°F. Moderate rain is expected, which may affect footing. With a light wind at 8 mph from the SSW, runners should adjust their pace conservatively and hydrate frequently.
Pace Calculator
Enter a finish time to see what race day does to it.
Get forecast alerts for ENDURrun 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
The ENDURrun Marathon is Stage 7 of The ENDURrun, a multi-day stage race held in Ontario's Waterloo Region since 2003 and organized by Run Waterloo. The marathon stage runs five 8.439 km loops on a mostly paved bike path at RIM Park in Waterloo and is a certified Boston Marathon-qualifying course (certification ON-2022-018-PTBA). As of a December 2024 format change, the full seven-stage ENDURrun Ultimate competition, the only format that includes the marathon stage, runs every other year (last held August 2026, next expected 2028); off-years feature a separate annual ENDURrun Sport event capped at the half-marathon distance.
