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Live forecasts update automatically; written guidance last reviewed 16 June 2026 by the Northern Focus Weather Desk. Data from Environment and Climate Change Canada and other national met services via Open-Meteo.
Live data from Open-Meteo · updates automatically ·
Longueuil’s weather today, as shown in the live forecast above, is characteristic of early spring on the South Shore—cool, with a mix of sun and cloud. This pattern often persists into April, when daytime highs finally climb above 10°C and the risk of snow diminishes.
What’s the long-range outlook for Longueuil?
The weather in Longueuil 10 days and Longueuil weather 7 days forecasts both point to a gradual warm-up as the jet stream shifts north. Extended models for weather Longueuil 30 days suggest near-normal temperatures for late March, though a brief return to winter is possible during the first week of April. For Longueuil weather hourly details, the live forecast above updates wind speeds and precipitation chances throughout the day.
How does Longueuil’s weather compare to Montreal weather?
Longueuil sits directly across the St. Lawrence River from Montreal, so conditions are nearly identical. Differences arise mainly from elevation and urban heat‑island effects—Montreal’s core can be 1–2°C warmer on calm winter nights.
When does Longueuil see its heaviest snowfall?
Most snow falls from mid‑December through February, with January averaging nearly 50 cm. Lake‑effect bands off the St. Lawrence can boost totals in the eastern parts of the city, especially during persistent northwest flow.
Are heat warnings common in Longueuil?
Heat warnings, issued when humidex values reach 40 or higher, occur roughly 2–4 times per summer. Environment and Climate Change Canada monitors conditions and alerts residents; you can check weather warnings for current advisories.
Sources
For broader Canadian outlooks, visit our Canada weather hub or compare with conditions in Ottawa weather.