Saint John · New Brunswick · 2026–27 season
Snow Day Predictor Saint JohnWill school be cancelled tomorrow in Saint John?
Live overnight forecast for the City of Saint John, Rothesay, Quispamsis, Grand Bay-Westfield, and the Kennebecasis Valley. The predictor tunes to Anglophone South School District and Francophone Sud School District closure patterns, accounting for the Bay of Fundy fog and freezing-fog events that close coastal routes more often than mainland New Brunswick.
Multi-model forecast, five-factor closure engine, province-aware results. No sign-up, no tracking of your queries.
What makes Saint John unique
Saint John is New Brunswick’s largest city, sitting on the Bay of Fundy where signature fog and freezing fog events define winter operations. Anglophone South and Francophone Sud districts make independent closure calls for the same Saint John area.
Bay of Fundy forecast
Saint John snow day forecast, what to expect this winter
Saint John is New Brunswick’s largest city and the country’s oldest incorporated city, sitting at the mouth of the Saint John River where it empties into the Bay of Fundy. That geography shapes every weather decision Anglophone South School District and Francophone Sud School District make through the winter. The bay holds its heat well into December, then loads the marine layer with moisture for the rest of the season. The result is a winter signature that no other New Brunswick city shares: dense advection fog and freezing fog rolling onshore on southeast winds, often glazing roads in a community while Fredericton and Moncton stay clear under the same synoptic pattern.
Average annual snowfall in Saint John runs around 280 cm, less than Moncton and noticeably less than Fredericton inland, because the Bay of Fundy moderates surface temperatures and pushes the rain-snow line back over the city in many storms. What Saint John gives up in snow total, it makes up in mixed precipitation, ice events, and visibility closures. Atlantic nor’easters strike here with direct onshore wind and tidal storm surge that affect West Saint John, the South End, and the coastal stretches of Anglophone South’s rural routes. Inland up the Kennebecasis Valley toward Rothesay and Quispamsis, the same storm can drop heavy snow while the harbour stays in freezing rain.
School operations for the Saint John area are run by two separate districts that make independent calls. Anglophone South School District covers the English public schools across Saint John, the Kennebecasis Valley, Charlotte County, and the Fundy Isles, with its head office in Saint John. Francophone Sud School District covers French-language schools across the southern half of New Brunswick from a Dieppe head office, including École Samuel-de-Champlain in Saint John. Because the two districts cover different geography with different bus operators, they regularly post different closure decisions for the same Saint John morning. The predictor returns a probability for each district so families with children in both systems can plan accordingly.
School boards
Saint John school boards we model
The boards and transportation operators that make the morning closure call for Saint John.
- Anglophone South School District (ASD-S)
English public school district covering Saint John, the Kennebecasis Valley (Rothesay, Quispamsis), Charlotte County, and the Fundy Isles. Head office in Saint John. Closure decisions account for Bay of Fundy fog more than any other New Brunswick district.
- Francophone Sud School District (DSFS)
French-language public school district covering the southern half of New Brunswick including Saint John, Moncton, and Fredericton. Head office in Dieppe. Makes its own closure call independent of Anglophone South, often with different bus operators on the same road.
Bus transportation
Each district contracts its own bus operators across the Saint John area. Calls are typically posted by 6:00 am the morning of, broadcast on local radio (CHSJ, Country 94, K100), and pushed through district social channels. The Bay of Fundy fog is a distinctive Saint John factor that closes Anglophone South routes more often than any other mainland New Brunswick district, particularly for coastal runs along Red Head Road, the Manawagonish corridor, and the rural stretches into Charlotte County.
Local weather
Saint John’s signature winter weather patterns
The phenomena that produce most Saint John snow days.
- Bay of Fundy fog and freezing fog
The signature Saint John event. Warm, moist marine air over the Bay of Fundy meets cold land surfaces and produces dense advection fog that drops visibility below 400 metres along coastal school bus routes. When surface temperatures sit just below freezing, the fog deposits a thin ice glaze on roads, bridges, and the Reversing Falls and Harbour Bridge approaches. Freezing-fog mornings close Anglophone South routes that other New Brunswick districts would run.
- Atlantic nor’easter direct landfall
Saint John sits in the direct path of nor’easters that track up the eastern seaboard and strike the Bay of Fundy with onshore winds gusting to 100 km/h. These storms deliver heavy wet snow or freezing rain, storm surge against the harbour, and power outages across the Saints John Energy grid. Most multi-day closures in Saint John are nor’easter events.
- Saint John River valley cold-air pooling
On clear, calm nights, cold air drains down the Saint John River valley and pools in the lower Kennebecasis Valley around Rothesay, Quispamsis, and Grand Bay-Westfield. Temperatures in these communities can sit 5 to 8 °C colder than uptown Saint John, dropping the freezing-rain line and producing icy bus routes inland while the harbour stays above zero.
- Tidal influence on coastal roads
The Bay of Fundy has the highest tides in the world, with a range over 8 metres in Saint John Harbour. During storm events, high tide combined with onshore winds pushes salt spray and surge onto coastal roads in West Saint John and along Route 1 between Saint John and St. Stephen, glazing surfaces when temperatures drop after the tide recedes.
- Onshore Atlantic wind events
Strong southeast to south winds push marine air inland for 24 to 48 hours at a time, holding temperatures near freezing and producing prolonged freezing drizzle. These events rarely accumulate large snow totals but produce road conditions sustained enough to keep Anglophone South buses parked across multiple consecutive mornings.
History
Notable Saint John snow days in recent winters
Storms and ice events that shaped how Saint John school boards approach the morning call.
Saint John ice storm
January 17, 2022A slow-moving Atlantic system delivered 25 to 35 mm of freezing rain across Saint John and the Kennebecasis Valley over more than 24 hours. Anglophone South School District closed schools across the Saint John area for multiple consecutive days as ice coated roads, downed tree limbs, and cut power to over 30,000 NB Power customers. The clearest recent example of how a Saint John ice event differs in duration from a mainland snowstorm.
White Juan
February 19-20, 2004A historic Atlantic Canada blizzard that dropped close to 100 cm in Halifax and 40 to 60 cm across southern New Brunswick. Saint John schools closed for multiple days. Although the heaviest snow stayed east of the Saint John area, the storm’s sustained 80 km/h winds and whiteout conditions shut Route 1 and the Harbour Bridge, defining the modern benchmark for an Atlantic Canada closure event.
Pre-Christmas Atlantic storm
December 21, 2010A deep low-pressure system tracked up the Fundy coast and delivered 30 cm of snow with freezing rain on the back side. Anglophone South cancelled buses and closed schools the last day before the holiday break. Saint John Energy reported widespread outages across West Saint John and the Kennebecasis Valley.
Post-tropical storm Dorian
September 7, 2019Hurricane Dorian arrived in southern New Brunswick as a powerful post-tropical storm with 100 km/h sustained winds and gusts over 130 km/h on the Fundy coast. Although the school year had just begun, the storm forced widespread closures across the Saint John area the following Monday for cleanup and power restoration, demonstrating how late-season tropical systems affect Atlantic New Brunswick.
February 2020 storm sequence
February 7-13, 2020A back-to-back run of Atlantic systems delivered three separate closure days for Anglophone South in a single week. Each event combined moderate snow accumulation with freezing rain and Bay of Fundy fog. The sequence is a textbook example of how Saint John’s closure totals build through compounding mid-winter events rather than single large storms.
Freezing fog event
December 5, 2018A persistent fog bank parked over Saint John Harbour with surface temperatures at −2 °C produced freezing fog that glazed roads from West Saint John to Quispamsis. Anglophone South cancelled buses on routes through Charlotte County and the Fundy Isles while Fredericton and Moncton operated normally, a distinctive Saint John outcome that the predictor models specifically.
FAQ
Saint John snow day frequently asked questions
The 7 questions Saint John parents and teachers ask us most.
Will Anglophone South close tomorrow?
Type your Saint John postal code or "Saint John, New Brunswick" into the predictor above. Anglophone South School District (ASD-S) makes its closure call by approximately 6:00 am the morning of, broadcast on CHSJ, Country 94, and the district’s social channels. The predictor returns an advance probability for Anglophone South the night before, based on the overnight forecast and historical Saint John closure thresholds, which are weighted more heavily toward fog and freezing-rain events than other New Brunswick districts.
How does Bay of Fundy fog close Saint John schools?
Bay of Fundy fog forms when warm, moist marine air moves over colder land. In Saint John, the fog rolls onshore on southeast winds and drops visibility below 400 metres on coastal bus routes through Red Head, the Manawagonish corridor, and into Charlotte County. When surface temperatures sit between −5 and 0 °C, the fog also deposits a thin ice glaze on road surfaces, called freezing fog. Anglophone South cancels affected bus routes more often than any other mainland New Brunswick district because of this signature Saint John condition.
Will school be cancelled in Rothesay or Quispamsis tomorrow?
Rothesay and Quispamsis are served by Anglophone South School District, the same district as Saint John itself, so a district-wide closure applies to both communities. However, the Kennebecasis Valley sits inland from the Bay of Fundy and frequently sees colder temperatures, more snow, and less fog than the harbour. The predictor uses your exact coordinates rather than averaging across the district, so the Kennebecasis Valley forecast reflects the cold-air pooling and inland snow signal specific to your address.
Will Francophone Sud close with Anglophone South?
Not always. Francophone Sud School District (DSFS) operates separately from Anglophone South, with its own bus contractors and its own decision-makers based in Dieppe. The two districts often reach the same conclusion on a major storm, but it is common for one to cancel buses while the other operates, particularly during freezing-fog or borderline freezing-rain events. The predictor returns a probability for each district so French-program families have an independent signal.
How is Saint John winter different from Moncton or Fredericton?
Saint John gets less total snow than either Moncton or Fredericton because the Bay of Fundy moderates temperatures and shifts more precipitation into mixed forms. Where Fredericton sees cold, dry inland snow and Moncton catches Atlantic system snow further east, Saint John gets ice, freezing rain, fog, and freezing fog. Closure days in Saint John are more often driven by visibility and road glazing than by snow accumulation, which is why our model weights those factors heavily for the Saint John forecast.
What is freezing fog?
Freezing fog occurs when fog droplets remain liquid at temperatures below 0 °C and then freeze on contact with road surfaces, vehicles, and infrastructure. It is distinct from ordinary fog (which only reduces visibility) and from freezing rain (which falls from clouds aloft). Saint John’s combination of Bay of Fundy moisture and frequent near-freezing surface temperatures makes the city one of the most freezing-fog-prone places in Canada. Environment Canada issues freezing-fog advisories for the Saint John area several times per winter.
How does the Bay of Fundy moderate Saint John winters compared to inland New Brunswick?
The Bay of Fundy holds significant heat through November and December because of its enormous tidal volume and direct exposure to the Atlantic. That marine influence keeps Saint John’s average winter low about 3 to 5 °C warmer than Fredericton, 75 km inland. In practice, that means Saint John sees fewer extreme cold days, more freezing-rain days, and noticeably more fog days than the rest of New Brunswick. It also means snow events near the freezing line tip toward rain or mixed precipitation in the harbour while staying as snow in the Kennebecasis Valley just a few kilometres inland.
Near Saint John
Nearby New Brunswick cities
Other New Brunswick cities our forecast covers — same regional profile, different local weather.
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