Longueuil · Quebec · 2026–27 season
Snow Day Predictor LongueuilWill school be cancelled tomorrow in Longueuil?
Live overnight forecast for Longueuil, Saint-Hubert, Greenfield Park, Le Vieux-Longueuil, Saint-Bruno-de-Montarville, Boucherville, and the wider South Shore. The predictor tunes to CSS Marie-Victorin, CSS des Patriotes, and Riverside School Board closure patterns across the Montérégie region.
Multi-model forecast, five-factor closure engine, province-aware results. No sign-up, no tracking of your queries.
What makes Longueuil unique
Longueuil is the largest city on Montreal’s South Shore and the fifth-largest in Quebec. CSS Marie-Victorin covers Longueuil along with surrounding Montérégie communities, making its closure call a regional decision rather than just a city one.
South Shore Montreal forecast
Longueuil snow day forecast, what to expect this winter
Longueuil sits on the south bank of the St. Lawrence River directly across from downtown Montreal, anchoring a South Shore agglomeration of roughly 450,000 residents that includes Saint-Hubert, Greenfield Park, Le Vieux-Longueuil, Saint-Lambert, and Brossard. The city is the fifth-largest in Quebec and the largest municipality in the Montérégie administrative region. Winters here run from late November through early April, with annual snowfall averaging around 210 cm, slightly less than the island of Montreal but offset by a more pronounced freezing-rain risk because Longueuil sits squarely inside the St. Lawrence Valley freezing-rain corridor.
School operations across Longueuil are divided among three main organizations. The Centre de services scolaire (CSS) Marie-Victorin is the dominant French-language public board, covering Longueuil itself plus a band of surrounding Montérégie communities. CSS des Patriotes runs French-language public schools across the eastern South Shore, including Saint-Bruno-de-Montarville, Boucherville, and the Vallée-du-Richelieu. Riverside School Board (RSB) is the English-language public board for the entire South Shore region, with elementary and secondary campuses from Saint-Lambert through Saint-Hubert and out to Saint-Jean-sur-Richelieu. A smaller French Catholic structure also operates within the Montérégie, though its footprint inside Longueuil itself is modest.
Because CSS Marie-Victorin’s territory stretches well beyond Longueuil’s municipal limits, its closure decision is effectively a regional Montérégie call rather than a city one. The board weighs road conditions across multiple suburban municipalities, freezing-rain forecasts from Environment and Climate Change Canada, and the operational status of its private bus contractors before issuing the morning bulletin. That is why a storm severe enough to close Longueuil schools usually closes schools across a much wider South Shore footprint, and why our forecast separates the closure probability for each of the three main boards even when they share the same overnight forecast.
School boards
Longueuil school boards we model
The boards and transportation operators that make the morning closure call for Longueuil.
- Centre de services scolaire (CSS) Marie-Victorin
The dominant French-language public board covering Longueuil and surrounding Montérégie communities including Saint-Hubert, Greenfield Park, and parts of Brossard. Its closure decision functions as a regional Montérégie call.
- Centre de services scolaire (CSS) des Patriotes
French-language public board for the eastern South Shore, including Saint-Bruno-de-Montarville, Boucherville, and the Vallée-du-Richelieu. Makes a separate closure call from CSS Marie-Victorin even on shared storm days.
- Riverside School Board (RSB)
The English-language public board for the entire South Shore, from Saint-Lambert through Saint-Hubert and out toward Saint-Jean-sur-Richelieu. Closure decisions are independent of the French boards.
- Catholic French-language structures (Montérégie)
A small French Catholic presence operates within the Montérégie alongside the public CSS network; closure decisions for these schools are issued separately and typically align with the nearest CSS.
Bus transportation
CSS Marie-Victorin and Riverside School Board contract directly with private bus operators across the South Shore. There is no inter-board transportation consortium covering Longueuil, which means each board makes its own weather call independently. Decisions are typically posted by 6:00 am on the board website and social channels, and a closure by one board does not automatically trigger a closure by the others even when they share routes through the same neighbourhoods.
Local weather
Longueuil’s signature winter weather patterns
The phenomena that produce most Longueuil snow days.
- St. Lawrence freezing-rain corridor
Longueuil sits inside the narrow band along the St. Lawrence Valley where warm air aloft regularly overruns a trapped cold surface layer. The geometry produces freezing rain rather than snow in roughly one in five major winter storms, and ice accretion above 5 mm is the single most common trigger for full South Shore school closures.
- South Shore Montérégie continental cold
Without the moderating effect of the island’s urban heat density, the South Shore plain runs noticeably colder than central Montreal on clear winter mornings. Wind chill values near −35 °C are routine in January and February and are a frequent factor in CSS Marie-Victorin bus-cancellation decisions.
- Mont-Saint-Bruno topographic enhancement
The Montérégie hills, including Mont-Saint-Bruno just east of Longueuil, add modest elevation lift that enhances snowfall totals over CSS des Patriotes territory. Boucherville and Saint-Bruno-de-Montarville can record 5–10 cm more from the same Colorado low that affects Le Vieux-Longueuil.
- Polar air outbreaks
Arctic air masses moving south across Quebec drop South Shore temperatures into the −25 °C range without snowfall. These cold-snap mornings are the second-most-common closure trigger after freezing rain, particularly when winds push wind chill below the −38 °C boards’ operational threshold.
- Spring freezing rain events
Late February through early April brings the season’s sharpest contrasts between warm Atlantic air and lingering cold surface layers. The Great Ice Storm of January 1998 is the canonical example; smaller spring ice events on the South Shore are a regular feature of March forecasts.
History
Notable Longueuil snow days in recent winters
Storms and ice events that shaped how Longueuil school boards approach the morning call.
Great Ice Storm
January 5-10, 1998The defining South Shore weather event of the modern era. Over five days, freezing rain deposited up to 100 mm of ice on the Longueuil area, more than any other part of Greater Montreal. Power was lost across most of the South Shore for two weeks or longer, schools were closed for the better part of a month, and the Canadian Armed Forces were deployed across the Montérégie. Every freezing-rain forecast in the Longueuil region is still measured against the 1998 benchmark.
March 2017 storm
March 8, 2017A Colorado low dropped 38 cm of snow on the South Shore over a 24-hour period, closing CSS Marie-Victorin and triggering a full Montérégie regional shutdown. The storm is the largest single-day snowfall to close Longueuil schools in the past decade.
January 2022 Quebec winter storm
January 17, 2022A major Quebec winter storm produced 25–30 cm of snow with sustained winds above 60 km/h across the South Shore. CSS Marie-Victorin, CSS des Patriotes, and Riverside School Board all closed; bus operators cancelled service the night before, an unusually early call.
Pre-Christmas storm
December 23, 2022A late-December storm combined heavy snowfall with blizzard-level winds and abrupt temperature drops in the days before Christmas. South Shore boards closed for the final day of the term as visibility on Highway 20 and the Champlain Bridge dropped near zero.
Storm of the Century
March 4-5, 1971The historical reference point for Quebec winter storms. Roughly 47 cm of snow fell on the Longueuil area with hurricane-force gusts and drifts that buried cars on Boulevard Taschereau. Schools were closed across the South Shore for several days and the storm remains the benchmark Montérégie blizzard.
February 2019 South Shore ice event
February 13, 2019A freezing-rain event glazed Longueuil and the South Shore with 15–20 mm of ice over a 12-hour window. CSS Marie-Victorin closed for two days while Hydro-Québec restored service to roughly 60,000 South Shore customers.
FAQ
Longueuil snow day frequently asked questions
The 7 questions Longueuil parents and teachers ask us most.
Will CSS Marie-Victorin close tomorrow?
Type your Longueuil postal code or "Longueuil, Quebec" into the predictor above. CSS Marie-Victorin posts its closure decision by 6:00 am on the board website and social channels. Because its territory covers Longueuil plus a wide band of Montérégie communities, a CSS Marie-Victorin closure is effectively a regional South Shore call and is the single most-watched signal in the area.
Will Riverside School Board close with CSS Marie-Victorin?
Often, but not always. Riverside School Board (RSB) covers the entire South Shore in English and makes its own weather call independent of the French boards. On unambiguous storms, freezing rain over 5 mm, snowfall over 25 cm, wind chill below −38 °C, all three boards typically close together. On marginal mornings, it is common for one board to close while another stays open, especially when road conditions vary between the Le Vieux-Longueuil core and the more rural eastern South Shore.
Will school be cancelled in Saint-Hubert or Greenfield Park tomorrow?
Saint-Hubert and Greenfield Park are boroughs of the City of Longueuil and are served by CSS Marie-Victorin in French and Riverside School Board in English. A closure for either board applies across all Longueuil boroughs, including Le Vieux-Longueuil, Saint-Hubert, and Greenfield Park. Enter your specific postal code in the predictor for the forecast at your exact coordinates, the South Shore freezing-rain corridor can vary block by block within the city.
How does Longueuil winter compare to Montreal?
Longueuil receives slightly less snow than the island of Montreal in a typical winter, roughly 210 cm versus 220 cm on average, but sits more directly inside the St. Lawrence Valley freezing-rain corridor. Without the urban heat island effect of central Montreal, the South Shore also runs 1–3 °C colder on clear mornings, which raises wind chill closures more frequently. A storm that drops snow in Longueuil can fall as freezing rain across the bridges on the island, and vice versa.
Does CSS des Patriotes (Boucherville area) always close with Marie-Victorin?
No. CSS des Patriotes covers the eastern South Shore, Saint-Bruno-de-Montarville, Boucherville, and the Vallée-du-Richelieu, and makes its own independent decision. Because Mont-Saint-Bruno adds modest topographic enhancement, des Patriotes territory often records 5–10 cm more snow from the same storm than Le Vieux-Longueuil. It is common for des Patriotes to close on storms where CSS Marie-Victorin stays open, and the opposite happens too on freezing-rain events that hit the river edge harder.
How does the Champlain Bridge area weather affect Longueuil schools?
The Samuel-De Champlain Bridge corridor between Brossard and the island of Montreal regularly sees the worst freezing-rain conditions on the South Shore because of the open exposure over the river. Bridge closures or accidents during the morning commute can cascade into late bus arrivals across western Longueuil even when the schools themselves are open. CSS Marie-Victorin and Riverside both monitor Champlain Bridge conditions as part of the 6:00 am call.
How did the 1998 ice storm affect the South Shore differently?
The Great Ice Storm of January 1998 hit the South Shore harder than any other part of Greater Montreal. Longueuil and the surrounding Montérégie were near the centre of the “triangle of darkness,” the area where ice accretion exceeded 80 mm and the Hydro-Québec transmission network collapsed. Schools across CSS Marie-Victorin and Riverside were closed for the better part of a month, and the storm remains the reference event every time a major freezing-rain forecast lands on the South Shore.
Near Longueuil
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Other Quebec cities our forecast covers — same regional profile, different local weather.
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