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Live forecasts update automatically; written guidance last reviewed 16 June 2026 by the Canada Edition Weather Desk. Data from Environment and Climate Change Canada and other national met services via Open-Meteo.
Live data from Open-Meteo · updates automatically ·
Salaberry-de-Valleyfield’s live forecast above shows conditions shaped by the St. Lawrence Seaway and Lake Saint-François — expect lake-influenced cloud, a breeze off the water, and readings that often differ a degree or two from inland Montreal communities like Beauharnois or Saint-Zotique.
How does Lake Saint-François affect today’s weather?
Salaberry-de-Valleyfield sits on the north shore of Lake Saint-François, an expanded reach of the St. Lawrence. That open water moderates spring and fall temperatures, keeping overnight lows a touch milder than towns farther from the river. In winter, lake-effect cloud can linger longer over the island, while summer afternoons sometimes catch a light breeze off the water that knocks a couple of degrees off the humidex.
What should Valleyfield residents watch for?
The Beauharnois Canal and the nearby hydroelectric dam complex can create local wind patterns — gusts may strengthen along the water in the afternoon, especially when a cold front passes. Fog also develops more readily over the lake on calm autumn nights, occasionally reducing visibility on the Monseigneur-Langlois Bridge into town.
Does Salaberry‑de‑Valleyfield get more snow than Montreal?
Typically yes, but only slightly. The lake adds a bit of extra moisture to passing systems, so snow accumulations can run 10–15 percent higher than downtown Montreal. The difference is most noticeable in lake-effect bands that set up after a cold front crosses the St. Lawrence.
When is the best time to visit Valleyfield for calm weather?
Late August through mid‑September brings the fewest storms, lightest winds, and comfortable daytime highs near 22–25 °C. The Regata des Voiles Latines often catches ideal sailing conditions in early July, but afternoon thunderstorms are more common that month.
How accurate are long‑range forecasts for this area?
Environment and Climate Change Canada’s three‑day outlook for Valleyfield is reliable within about 2 °C and a 40‑percent probability of precipitation. Beyond day five, confidence drops as small shifts in the position of the St. Lawrence trough can flip rain to sun or vice versa.
Sources
For a broader look at conditions across the province, visit the Canada Weather Hub or check the Ottawa Weather page for comparisons along the Ottawa Valley corridor.