Chelsea weather
Loading live data…Clear,warmer tomorrow
Env. Canada, the European and the American model agree on a high near 12° in Chelsea today. Tomorrow: cloudy, around 16°, with a 1% chance of rain.
CheckWeather.io on iPhoneFree. No ads, no account.Chelsea weather in numbers
from 30 years of measured normalsChelsea swings 39°C across the year, from 25°C highs in July to -14°C lows in February, and September is usually the wettest month in a year that brings about 1025 mm of precipitation.
The weather map: all three models at once
Env. Canada, European, American side by side around Chelsea and nearby towns.Live rain radar →Chelsea 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…
Chelsea 10-day forecast, out to 14 days
where the models agree, and where they splitChelsea, Quebec is at its warmest in Jul (average highs near 25°C) and coldest in Feb (lows around -14°C), with roughly 1025 mm of precipitation across the year. Below, compare what Env. Canada, European, American forecast for Chelsea 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.
Chelsea climate by month
average daytime high and overnight low across a typical year (1991-2020)Source: 1991-2020 averages, ERA5 for this place adjusted with NASA POWER.
How the weather around Chelsea has changed since 1995
Chelsea sits in the same roughly 50 km square of NASA's reanalysis as Ottawa. That square shows no clear change in temperature between 1995-2004 and 2015-2024. See the full 30-year picture on the Ottawa page.
Which forecast is most accurate in Chelsea?
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 1320 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.
What do you think of the forecasts?
your vote countsThe accuracy above is the measured record. This is your opinion: which forecast service do you trust most in Canada? Give each 1 to 5 stars.
One vote per service. Anonymous: we store no personal data, only a one-way hash of your connection for a day to stop double votes.
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.