St. Thomas weather
Loading live data…Cloudy,much the same tomorrow
Env. Canada, the European and the American model put St. Thomas's high today between 23° and 26°, a 2° split. Tomorrow looks cloudy around 23°, with a 2% chance of rain.
The weather map: all three models at once
Env. Canada, European, American side by side around St. Thomas and nearby towns.Live rain radar →Next 14 hours
consensus of the three models14-day forecast
where the models agree, and where they splitSt. Thomas, Ontario is at its warmest in Jul (average highs near 26°C) and coldest in Feb (lows around -5°C), with roughly 1079 mm of precipitation across the year. Below, compare what Env. Canada, European, American forecast for St. Thomas right now, and see exactly where they disagree.
We grade every model against the weather that actually happened, so you can see which forecast model is most accurate in Canada before you trust any single number.
St. Thomas climate by month
average daytime high and overnight low across a typical yearWhich forecast is most accurate in St. Thomas?
CheckWeather Score — graded against the weather that actually happened
The CheckWeather Score blends temperature, wind and rain accuracy — each measured against ERA5 (the recorded weather) over the last 30 days across 1302 cities. Lower error means a higher score. See which forecast model is most accurate in Canada, how we measure forecast accuracy, or which model each weather app uses.
Where the models disagree
temperature and rain, judged separatelyThe models often agree on temperature and still split on rain — and rain is usually what decides whether a plan survives. A wide rain range means the shower is genuinely uncertain, not that the forecast is wrong.