racecast.ioPartly cloudy throughout the day.
Details
Pre-Race
Race
Post-Race
Non-GMO Organic carb heavy chews to power your run. Dairy Free. Nut Free. Gluten Free. Honey Stinger Energy Chews.
When you buy through our links, we may earn a commission.
Wanna to know when the weather changes? .
Race Overview
A Boston-qualifier marathon that follows the St. Lawrence River from Crysler Park Marina to St. Lawrence College in Cornwall, Ontario. Half marathon, 10K, and 5K distances follow the Great Lakes Waterfront Trail along the same stretch of river. The course has a net downhill elevation profile.
WikipediaFAQ
When is the 2027 St. Lawrence Marathon?
The 2027 St. Lawrence Marathon will be held on Saturday April 24, 2027.
Is the St. Lawrence Marathon a Boston Marathon Qualfier?
Yes, the St. Lawrence Marathon is an official Boston Marathon qualifier.
St. Lawrence Marathon Course Map
Loading Course Map...
St. Lawrence Marathon Weather History
St. Lawrence Marathon Weather Averages
Average Temp: 47°, Average Low: 37°, Average High: 57°
| Time | 7AM | 8AM | 9AM | 10AM | 11AM | 12PM | 1PM | 2PM |
|---|---|---|---|---|---|---|---|---|
| Temp | 41° | 45° | 48° | 49° | 50° | 51° | 52° | 53° |
| Feel | 38° | 41° | 45° | 46° | 47° | 49° | 50° | 51° |
| Rain | - | - | - | - | - | - | - | - |
| Wind | 7mph | 7mph | 8mph | 11mph | 11mph | 11mph | 11mph | 11mph |
| Dew | 33° | 33° | 33° | 32° | 33° | 34° | 34° | 35° |
| RunScore |  | | | | | | | |
St. Lawrence Marathon 2026
Apr 25, 2026
Clear conditions throughout the day.
Low: 33°, High: 57°
| Time | 7AM | 8AM | 9AM | 10AM | 11AM | 12PM | 1PM | 2PM |
|---|---|---|---|---|---|---|---|---|
| Temp |  38° | 42° | 46° | 48° | 50° | 52° | 54° | 56° |
| Feel | 31° | 36° | 39° | 41° | 44° | 52° | 54° | 56° |
| Rain | - | - | - | - | - | - | - | - |
| Wind | 9mph | 9mph | 16mph | 19mph | 18mph | 18mph | 19mph | 18mph |
| Dew | 26° | 27° | 26° | 26° | 27° | 27° | 28° | 27° |
| RunScore | |  |  | | | | | |
St. Lawrence Marathon 2025
Apr 26, 2025
Cloudy skies throughout the day with rain.
Low: 44°, High: 52°, Moderate Rain
| Time | 7AM | 8AM | 9AM | 10AM | 11AM | 12PM | 1PM | 2PM |
|---|---|---|---|---|---|---|---|---|
| Temp |  46° |  46° | 47° | 47° | 47° | 49° | 50° | 50° |
| Feel | 41° | 42° | 43° | 43° | 44° | 47° | 49° | 50° |
| Rain | - | light | light | light | - | light | light | light |
| Wind | 10mph | 7mph | 9mph | 7mph | 6mph | 4mph | 3mph | 1mph |
| Dew | 43° | 44° | 44° | 45° | 45° | 47° | 47° | 47° |
| RunScore | | | | | | | | |
St. Lawrence Marathon 2024
Apr 27, 2024
Becoming cloudy in the afternoon with rain.
Low: 32°, High: 71°, Light Rain
| Time | 7AM | 8AM | 9AM | 10AM | 11AM | 12PM | 1PM | 2PM |
|---|---|---|---|---|---|---|---|---|
| Temp | 36° | 46° | 54° | 60° | 63° | 65° | 67° | 70° |
| Feel | 36° | 45° | 54° | 60° | 63° | 65° | 67° | 70° |
| Rain | - | - | - | - | - | - | - | - |
| Wind | 1mph | 4mph | 7mph | 10mph | 10mph | 15mph | 13mph | 12mph |
| Dew | 30° | 30° | 30° | 30° | 30° | 29° | 29° | 30° |
| RunScore | |  | | | | | | |
St. Lawrence Marathon 2023
Apr 29, 2023
Partly cloudy throughout the day with rain.
Low: 46°, High: 55°, Heavy Rain
| Time | 7AM | 8AM | 9AM | 10AM | 11AM | 12PM | 1PM | 2PM |
|---|---|---|---|---|---|---|---|---|
| Temp | 50° | 53° | 55° | 54° | 51° | 49° | 47° | 48° |
| Feel | 50° | 53° | 55° | 54° | 51° | 47° | 44° | 43° |
| Rain | - | - | - | - | light | light | moderate | light |
| Wind | 5mph | 6mph | 4mph | 12mph | 5mph | 5mph | 7mph | 11mph |
| Dew | 39° | 40° | 39° | 36° | 40° | 43° | 44° | 43° |
| RunScore | | | | | | |  | |
St. Lawrence Marathon 2022
Apr 30, 2022
Clear conditions throughout the day.
Low: 32°, High: 60°
| Time | 7AM | 8AM | 9AM | 10AM | 11AM | 12PM | 1PM | 2PM |
|---|---|---|---|---|---|---|---|---|
| Temp | 35° | 42° | 45° | 49° | 51° | 52° | 54° | 56° |
| Feel | 35° | 42° | 45° | 47° | 51° | 52° | 54° | 56° |
| Rain | - | - | - | - | - | - | - | - |
| Wind | 0mph | 1mph | 1mph | 5mph | 8mph | 8mph | 6mph | 7mph |
| Dew | 27° | 22° | 22° | 24° | 23° | 22° | 22° | 24° |
| RunScore | | | | | | | | |
St. Lawrence Marathon 2019
Apr 27, 2019
Partly cloudy throughout the day with a chance of rain throughout the day.
Low: 36°, High: 48°, Moderate Rain
| Time | 7AM | 8AM | 9AM | 10AM | 11AM | 12PM | 1PM | 2PM |
|---|---|---|---|---|---|---|---|---|
| Temp | 41° | 40° | 39° | 39° | 40° | 42° | 41° | 40° |
| Feel | 33° | 31° | 31° | 31° | 31° | 33° | 33° | 32° |
| Rain | light | light | light | light | - | light | light | light |
| Wind | 14mph | 16mph | 13mph | 15mph | 17mph | 19mph | 16mph | 15mph |
| Dew | 36° | 35° | 35° | 34° | 34° | 34° | 34° | 36° |
| RunScore | |  | | | | | | |