Lake · Canada
Lac Saint-Louis
Widening of the Saint Lawrence River, Montreal
- Area
- 151km²
- Max depth
- 28m
- Average depth
- 5.7m
- Elevation
- 19m a.s.l.
- Shoreline
- 177km
- Volume
- 0.855km³
Lac Saint-Louis is a lake in Canada. It covers 151 km². On average it is 5.7 m deep, and 28 m at its deepest point. Its surface lies 19 m above sea level.
Plan your visit
Stay, sail and get there
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The water
How warm is Lac Saint-Louis?
The water is warmest in August, around 22 °C at the surface, and coldest in January, around 0 °C. The surface averages 20 °C or more from July to August: comfortable for most swimmers.
The lake usually freezes over for about 115 days a year, from around 12 December to 5 April.
On the shore, afternoons reach 26 °C on average in July and -6 °C in January. The driest month is February (68 mm of rain), the wettest October (114 mm).
Average surface temperature measured by the Landsat 8 satellite between 2013 and 2021 at the point furthest from the shore (139 readings). Shallow bays and beaches are often warmer.
From above
The whole lake from space
Month by month
The year at the lake, month by month
Not a forecast: these are averages over many years. Water is the 2013–2021 average; air, rain, sun and wind are the 1991–2020 average.
Water: 2013–2021 averageClimate: 1991–2020 average
| Month | Water°C | Water high°C | Air high°C | Air low°C | Rainmm | Rainy daysdays | Sunh/day | Windkm/h |
|---|---|---|---|---|---|---|---|---|
| January | Ice | — | -6 | -16 | 72 | 14 | 3.3 | 17 |
| February | Ice | — | -4 | -15 | 68 | 11 | 4.8 | 18 |
| March | Ice | — | 2 | -8 | 76 | 12 | 5.9 | 18 |
| April | 3 | 6 | 10 | 0 | 95 | 13 | 6.1 | 17 |
| May | 11 | 14 | 18 | 8 | 93 | 14 | 6.9 | 15 |
| June | 18 | 20 | 23 | 14 | 109 | 16 | 7.7 | 14 |
| July | 22 | 23 | 26 | 17 | 95 | 17 | 8.1 | 13 |
| August | 22 | 23 | 26 | 16 | 98 | 14 | 7.5 | 13 |
| September | 20 | 22 | 22 | 11 | 88 | 12 | 6.5 | 14 |
| October | 14 | 18 | 13 | 4 | 114 | 13 | 3.7 | 15 |
| November | 7 | 11 | 5 | -2 | 81 | 13 | 2.6 | 15 |
| December | Ice | — | -2 | -11 | 98 | 14 | 1.9 | 16 |
Water: LakeTEMP (Landsat 8, 2013–2021). Air, rain, sun and wind: NASA POWER, 1991–2020 averages. A rainy day has at least 1 mm of rain. Sunshine hours are derived from measured solar radiation.
Size & depth
How big, how deep
- On average, water stays in the lake for about 1 days before flowing out.
- Its catchment drains 932,539 km² of land.
- About 10,041 m³ of water flow out every second, on average.
- Its shoreline is 4.1 times longer than a circle of the same area: plenty of bays and inlets.
Around the shore
What's around Lac Saint-Louis
Counted within 1.5 km of the shoreline in OpenStreetMap, the map anyone can edit.
- 13beaches and swimming spots
Kahnawake Beach, Annabelle-Beach, Johnson Beach, Bay Access and 9 more
- 2campsites
Tente artisanale, Village des Écluses
- 4boat hire and water-sport clubs
Base de Voile de Pointe-Claire - Grande-Anse, Pointe Claire Canoe Club, Nautical Rental Kiosk, Kahnawake Quarry
- 99marinas and slipways
Melocheville, Marina de Melocheville, Parc Riverain, Rue des Pins, Centre nautique Châteuguay and 94 more
- 4ferry piers
Navette fluviale Châteauguay, Dorval - Île-Dorval, Traversier;Navette fluviale Lachine
- 10viewpoints
Arbre d'observation and 9 more
- 18hotels, B&Bs and chalets
Môtel Le Marigot, Môtel La Bourgade, Môtel Seigneurie de Vaudreuil, Beauséjour Appartements - Hotel Dorval, Marriott Fairfield Inn and 13 more
- 4fishing spots
Quai de la 34e avenue, Lac St-Louis (doré, achigan, perchaude, maskinongé), Parc Riverain (perchaude, brochet, maskinongé, doré), Lac St-Louis (perchaude, brochet, doré, maskinongé)
- 156restaurants and cafés
Towns on the shore
- Châteauguay42,786 people
- Pointe-Claire30,161 people
- Kirkland20,491 people
- Beaconsfield19,194 people
- Dorval18,980 people
- Beauharnois11,918 people
- Pincourt11,197 people
- L'Île-Perrot9,927 people
Nearest airport with scheduled flights: Montreal / Pierre Elliott Trudeau International Airport (YUL), 11 km in a straight line.
Car hire at YUL airport (Montréal)Discover Cars · Affiliate linkOpenStreetMap is built by volunteers: when a number is low, it may just mean nobody has mapped it yet.
Photos
Seen by visitors
Recent years
How each month compared
Afternoon high on the shore. The first row is the reference, the 1991–2020 average in °C; the years below show the difference from it: warmer in orange, cooler in blue.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1991–2020 average | -6.0 | -4.1 | 1.5 | 10.5 | 18.5 | 23.3 | 26.5 | 26.2 | 22.4 | 13.3 | 5.2 | -2.4 |
| 2020 | +2.1 | +1.4 | +2.3 | −1.8 | −0.9 | +1.8 | +3.9 | +0.2 | −1.6 | −0.4 | +2.4 | +2.8 |
| 2021 | +0.9 | −0.7 | +3.4 | +2.1 | +0.8 | +3.2 | −0.3 | +3.4 | +0.7 | +3.3 | +0.5 | +2.0 |
| 2022 | −2.3 | +1.5 | +1.4 | −0.2 | +2.4 | −0.3 | +0.9 | +1.2 | −1.1 | +2.3 | +2.3 | +2.4 |
| 2023 | +3.3 | +1.9 | +1.4 | +1.6 | +0.3 | −0.1 | +0.3 | −1.2 | +1.7 | +3.0 | −1.1 | +2.5 |
| 2024 | +2.4 | +3.7 | +4.3 | +1.5 | +2.1 | +1.7 | +2.1 | −0.2 | +1.3 | +2.4 | +2.7 | +0.3 |
| 2025 | +0.1 | −1.0 | +3.3 | +0.8 | +0.3 | +2.3 | +3.3 | +1.7 | +1.4 | +2.8 | −1.8 | −1.8 |
+1 warmer than usual −1 cooler than usual
Nearby
More lakes nearby
Canada153 km² · 14 km away24°maxLake Saint FrancisCanada238 km² · 35 km away22°maxLake ChamplainCanada1,141 km² · 110 km away23°maxLake MemphremagogCanada90.7 km² · 130 km away22°maxLake George
United States113 km² · 187 km away24°maxLake WinnipesaukeeUnited States182 km² · 281 km away23°maxAbout these numbers
| Outline, area, depth, volume | HydroLAKES v1.0 (Messager et al. 2016) · CC BY 4.0 |
|---|---|
| Water temperature and ice | LakeTEMP v1 (Korver et al. 2024), Landsat 8 2013–2021 · CC BY 4.0 |
| Air, rain, sun, wind | NASA POWER, 1991–2020 · public domain |
| Names and description | Wikidata (Q175828) · CC0 |
| Around the shore | © OpenStreetMap contributors · ODbL |
| Images | EOX Sentinel-2 cloudless 2016 · CC BY 4.0; Wikimedia Commons |
Every figure is an average or a count from a public dataset. Licences and methods: data sources.
