St. Thomas Snow Day Predictor
Check tomorrow's estimated chance of a snow day in St. Thomas, ON, including the weather signal behind bus cancellations, school closures and delays, then confirm with the official Student Transportation Services (Southwestern Ontario) notice.
Will school close tomorrow?
Enter a city, ZIP code, or postal code. We use live weather data to estimate closure, delay, and normal-schedule chances.
Why this estimate?
Tomorrow morning
5-day snow day outlook
Same model, one forecast request. Later days are planning signals and become less certain farther from today.
St. Thomas snow day forecast for Thursday, November 5
The forecast for St. Thomas shows little winter-weather disruption signal for Thursday, November 5.
- Snow forecast for the day: 0.0 cm, including 0.0 cm in the 4–9 AM travel window.
- Morning low 11°C, feeling like 8°C, with gusts up to 47 km/h.
- Wind gusts: 47 km/h
5-day St. Thomas outlook
| Day | Snow | Low / high | Closure | Delay |
|---|---|---|---|---|
| Thu Nov 5 | 0.0 cm | 10° / 16°C | 0% | 0% |
| Fri Nov 6 | 0.0 cm | 4° / 10°C | 0% | 0% |
| Sat Nov 7 | 0.0 cm | 4° / 9°C | 0% | 0% |
| Sun Nov 8 | 0.0 cm | 5° / 12°C | 0% | 0% |
| Mon Nov 9 | 0.0 cm | 3° / 13°C | 0% | 0% |
Snapshot saved 3:44 PM EST from the same weather model as the live calculator above, which always shows the newest run. Later days are less certain. This is not an official school or transportation announcement.
St. Thomas bus cancellations and school closures
St. Thomas and Elgin County schools are part of the Thames Valley and London District Catholic boards, with bus cancellations posted on mybigyellowbus.ca alongside London and the other counties.
Who makes the call in St. Thomas
- School board: Thames Valley District School Board (TVDSB)
- School board: London District Catholic School Board (LDCSB)
- School buses: Student Transportation Services (Southwestern Ontario)
How St. Thomas weather decisions work
- Bus cancellations for the London region are posted on mybigyellowbus.ca, which lists cancellations by zone and route.
- Rural county zones and City of London routes can be treated differently. On February 28, 2023, all buses in Middlesex, Oxford and Elgin counties were cancelled while city routes ran, and both TVDSB and LDCSB kept schools open.
Local weather to watch
Elgin County is largely rural and borders Lake Erie, and county routes do not always get the same decision as London city routes.
Local guidance reviewed November 2, 2026. Official school-board and transportation notices always take priority over this estimate.
Chance of a snow day in St. Thomas
The estimate above is driven by the forecast for St. Thomas, not by generic city text. Snow during the early-morning travel window counts more than snow that ends earlier, and the model also checks freezing precipitation, refreeze risk, severe cold, wind gusts and visibility.
Bus cancellation or school closure? In many Canadian boards the first thing bad weather changes is transportation: buses are cancelled for the day while schools stay open for students who can get there safely. The "weather disruption signal" combines the closure and delay chances as a rough guide to how likely the morning is to be disrupted. It is not a separate, calibrated bus-cancellation model.
How this St. Thomas estimate works
The baseline model uses live Open-Meteo forecast data. It does not claim to know a board's historical closure behaviour, and ChanceOfSnowDay does not publish an accuracy percentage until verified outcomes have been collected and reviewed.