St. Marys weather
Loading live data…Drizzle,rain likely tomorrow
Env. Canada, the European and the American model agree on a high near 18° in St. Marys today. Tomorrow looks light drizzle around 20°, with a 83% chance of rain.
CheckWeather.io on iPhoneFree. No ads, no account.St. Marys weather in numbers
from 30 years of measured normalsSt. Marys swings 30°C across the year, from 25°C highs in July to -5°C lows in January, and July is usually the wettest month in a year that brings about 1040 mm of precipitation.
The weather map: all three models at once
Env. Canada, European, American side by side around St. Marys and nearby towns.Live rain radar →St. Marys hourly forecast: next 14 hours
consensus of the three modelsRain in the next 24 hours, model by model
each model's own hourly precipitation, side by sideLoading the three models…
St. Marys 10-day forecast, out to 14 days
where the models agree, and where they splitSt. Marys, Ontario is at its warmest in Jul (average highs near 25°C) and coldest in Jan (lows around -5°C), with roughly 1040 mm of precipitation across the year. Below, compare what Env. Canada, European, American forecast for St. Marys 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. Marys climate by month
average daytime high and overnight low across a typical yearWhich forecast is most accurate in St. Marys?
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 1304 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.
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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.