Cornwall weather
Loading live data…Cloudy,rain likely tomorrow
Env. Canada, the European and the American model put Cornwall's high today between 15° and 18°, a 3° split. Tomorrow looks light rain around 15°, with a 94% chance of rain.
CheckWeather.io on iPhoneFree. No ads, no account.Cornwall weather in numbers
measured normals and 10 years of recorded weatherCornwall swings 36°C across the year, from 27°C highs in July to -9°C lows in February, and August is usually the wettest month in a year that brings about 1129 mm of precipitation. Over 10 years of recorded weather it averages 66 days a year at 25°C or above, 12 of them at 30°C or above, 139 frost nights, and rain on 147 days.
Day counts are from the ERA5 reanalysis for Cornwall’s grid square, 2016 to 2025, counted the same way for every city so the numbers compare. A reanalysis square is an area, not a weather station, so it is good for counting days and not for a single day’s record.
The weather map: all three models at once
Env. Canada, European, American side by side around Cornwall and nearby towns.Live rain radar →Cornwall 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…
Cornwall 10-day forecast, out to 14 days
where the models agree, and where they splitCornwall, Ontario is at its warmest in Jul (average highs near 27°C) and coldest in Feb (lows around -9°C), with roughly 1129 mm of precipitation across the year. Below, compare what Env. Canada, European, American forecast for Cornwall 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.
Cornwall climate by month
average daytime high and overnight low across a typical yearWhich forecast is most accurate in Cornwall?
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.