Starting at 61°F, heat will be a factor from the gun — go out conservative and stay on top of hydration. Temperatures rising to 72°F through the course will gradually increase perceived effort in the second half. Light winds shouldn't be a major factor for pacing.

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Distance: 13.1mi

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About the Marathon de Longueuil 21.1 km

The 21.1 km half marathon starts and finishes at Colisee Jean-Beliveau on Boulevard Jacques-Cartier Est in Longueuil, on the south shore of the Saint Lawrence River. It runs out along Boulevard Jean-Paul-Vincent, loops through Parc Michel-Chartrand, then heads southwest through the residential streets near Rue Saint-Charles and Boulevard Quinn before returning past Rue Geoffrion and Boulevard Fernand-Lafontaine to the park. The course is flat, staying within roughly 25 metres of elevation the whole way, and is certified by Athletics Canada.

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Race weekend

Sunday, May 17

7:45 AM10 km (6.2 mi)

8:15 AM21.1 km (13.1 mi)

8:15 AMMarathon (26.2 mi)

11:30 AM5 km (3.1 mi)

12:00 PM1 km (0.6 mi)

12:20 PM2 km (1.2 mi)

Course Map

Marathon de Longueuil 21.1 km FAQ

When is the 2026 Marathon de Longueuil 21.1 km?

The 2026 Marathon de Longueuil 21.1 km will be held on Sunday May 17, 2026.

What is the time limit for the Marathon de Longueuil 21.1 km?

The time limit for the Marathon de Longueuil 21.1 km is 3.5 hours.

What will the weather be like for the 2026 Marathon de Longueuil 21.1 km?

The forecast calls for a high of 73°F and a low of 57°F with a 0% chance of rain. Check our detailed hourly forecast above for the best half marathon race plan.

What is the weather usually like for the Marathon de Longueuil 21.1 km?

Over the 6 years racecast.io has race-day weather for (2016 to 2026), it averaged 62°F at the start and 66°F by a typical finish. It has not rained during race hours in any of those years.

What was the hottest Marathon de Longueuil 21.1 km?

Of the 6 years on record, 2022 was the warmest, reaching 77°F during race hours. The coldest start was 2025, at 56°F.

What was the windiest Marathon de Longueuil 21.1 km?

Of the 6 years on record, 2022 was the windiest, with wind averaging 12 mph during race hours. The calmest was 2026, at 6 mph.

Marathon de Longueuil 21.1 km weather history

Based on 6 years of data

Avg Temp

64°F

L:62° H:66°

RunScore

Conditions

Rain Freq

0 of 6 yrs

Wind9mph

Dew52°F

Temperature History

Range of temperatures during race hours for each year.

Detailed History

Year	Low / High	Rain	Dew Point
2026 Marathon de Longueuil 21.1 km Partly cloudy throughout the day. 2026	61°/66°	-	49°
2025 Marathon de Longueuil 21.1 km Cloudy skies throughout the day with rain. 2025	56°/59°	-	52°
2024 Marathon de Longueuil 21.1 km Clearing in the afternoon. 2024	65°/68°	-	50°
2023 Marathon de Longueuil 21.1 km Partly cloudy throughout the day with late afternoon rain. 2023	60°/62°	-	49°
2022 Marathon de Longueuil 21.1 km Partly cloudy throughout the day. 2022	69°/77°	-	64°
2016 Marathon de Longueuil 21.1 km Clearing in the afternoon. 2016	60°/65°	-	49°

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