Markham weather
Loading live data…Clear,much the same tomorrow
Env. Canada, the European and the American model put Markham's high today between 12° and 14°, a 2° split. Tomorrow: partly cloudy, around 16°, with a 0% chance of rain.
Latest for Markham: Env. Canada (GEM model): 5° Clear · European (ECMWF): 8° Clear · American (NOAA GFS): 5° Clear.
CheckWeather.io on iPhoneFree. No ads, no account.Markham weather in numbers
measured normals and 10 years of recorded weatherMarkham swings 35°C across the year, from 26°C highs in July to -9°C lows in February, and August is usually the wettest month in a year that brings about 903 mm of precipitation. Over 10 years of recorded weather it averages 66 days a year at 25°C or above, 11 of them at 30°C or above, 131 frost nights, and rain on 136 days.
Day counts are from the ERA5 reanalysis for Markham’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 Markham and nearby towns.Live rain radar →Markham 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…
Markham 10-day forecast, out to 14 days
where the models agree, and where they splitMarkham, Ontario. Below we compare what Env. Canada, European, American forecast for Markham right now and flag exactly where they disagree, then break down Markham's weather month by month and which forecast model has been most accurate here.
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.
Markham weather by month
what to expect in Markham through the year, 1991-2020 averagesHere is Markham's typical weather in each month: the average daytime high and overnight low in °C, how each month feels, and the wettest month marked. Use it to plan any trip to Markham by season.
What Markham's weather is like through the year
Markham runs from warm summers, with July highs near 26°C, to cold winters, when February lows sit around -9°C (a swing of about 35°C across the year). August is usually the wettest month, and Markham sees roughly 903 mm of precipitation annually. Overnight lows stay below freezing across 4 months (January, February, March and December), so Markham sees regular winter snowfall.
Best time to visit Markham
The most comfortable time to visit Markham is usually May, June, July and September, when daytime highs sit in the pleasant 16-26°C range and the heaviest August rain is behind you.
How the weather around Markham has changed since 1995
Markham sits in the same roughly 50 km square of NASA's reanalysis as North York. That square ran 1.0°C warmer in 2015-2024 than in 1995-2004. See the full 30-year picture on the North York page.
Which forecast is most accurate in Markham?
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.
Bottom line: over the last 30 days the European model has been the most accurate forecast for Markham, scoring 89/100 on our CheckWeather Score, ahead of the Env. Canada at 87. See the full CA accuracy scoreboard for exactly how every model is tested.
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.