Ottawa Marathon
Ottawa, ON, Canada · May 30, 2027
Race Day Weather
59°at start
75° high
Breezy
Dry
Warming trend, light winds
Runners will face a temperature rise from 58°F at the start to a peak of 75°F. Winds will be light at 8 mph from the WSW, with occasional gusts. With humidity at 62%, it's advisable to start conservatively and hydrate frequently as temperatures climb.
Race day forecast available in 241 days
Pre-raceRace windowPost-race
Pace Calculator
Distance: 26.2mi
0:00:00
HH:MM:SS
Get forecast alerts for Ottawa 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 Tartan Ottawa International Marathon is Canada’s fastest marathon. This race attracts thousands of participants, including a world-class contingent of pro-athletes every year. The Tartan Ottawa International Marathon is a World Athletics Elite Label Race and one of Canada’s largest Boston Qualifiers. Source
FAQ
When is the 2027 Ottawa Marathon?
The 2027 Ottawa Marathon will be held on Sunday May 30, 2027.
Is the Ottawa Marathon a Boston Marathon Qualifier?
Yes, the Ottawa Marathon is an official Boston Marathon qualifier.
What will the weather be like for the 2027 Ottawa Marathon?
The forecast calls for a high of 74°F and a low of 53°F with a 11% chance of rain. Check our detailed hourly forecast above for the best marathon race plan.
More ON Races
St. Lawrence Marathon
2027-04-24 · Cornwall, ON, Canada
Mississauga Marathon
2027-04-25 · Mississauga, ON, Canada
Georgina Spring Fling Marathon
2027-05-02 · 42.200km · Georgina, ON, Canada
That Dam Hill Marathon
2026-09-19 · 42.200km · London, ON, Canada
The County Marathon
2026-10-04 · 42.200km · Wellington, ON, Canada
Muskoka Marathon
2026-10-04 · 42.200km · Bracebridge, ON, Canada