Hamilton weather
Loading live data…Clear,warmer tomorrow
Env. Canada, the European and the American model put Hamilton's high today between 13° and 16°, a 3° split. Tomorrow: cloudy, around 19°, with a 2% chance of rain.
Latest for Hamilton: Env. Canada (GEM model): 2° Clear · European (ECMWF): 9° Clear · American (NOAA GFS): 4° Clear.
CheckWeather.io on iPhoneFree. No ads, no account.Hamilton weather in numbers
measured normals and 10 years of recorded weatherHamilton swings 35°C across the year, from 26°C highs in July to -9°C lows in February, and July is usually the wettest month in a year that brings about 972 mm of precipitation. Over 10 years of recorded weather it averages 73 days a year at 25°C or above, 15 of them at 30°C or above, 123 frost nights, and rain on 130 days.
Day counts are from the ERA5 reanalysis for Hamilton’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 Hamilton and nearby towns.Live rain radar →Hamilton in 3D: the weather on the streets, hour by hour
Rain, sun and real shadows drawn on a 3D map of Hamilton, 48 hours ahead. Drag the timeline, pick what you are doing or where you are going, and read the verdict for that hour.Full screen ↗What are you doing?
Where are you going?
Hamilton 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…
Hamilton 10-day forecast, out to 14 days
where the models agree, and where they splitHamilton, Ontario. Below we compare what Env. Canada, European, American forecast for Hamilton right now and flag exactly where they disagree, then break down Hamilton'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.
Hamilton weather by month
what to expect in Hamilton through the year, 1991-2020 averagesHere is Hamilton'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 Hamilton by season.
What Hamilton's weather is like through the year
Hamilton 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). July is usually the wettest month, and Hamilton sees roughly 972 mm of precipitation annually. Overnight lows stay below freezing across 4 months (January, February, March and December), so Hamilton sees regular winter snowfall.
Best time to visit Hamilton
The most comfortable time to visit Hamilton is usually May, June, August and September, when daytime highs sit in the pleasant 16-26°C range and the heaviest July rain is behind you.
How the weather around Hamilton has changed since 1995
Hamilton sits in the same roughly 50 km square of NASA's reanalysis as Brampton. That square ran 0.9°C warmer in 2015-2024 than in 1995-2004. See the full 30-year picture on the Brampton page.
Which forecast is most accurate in Hamilton?
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 Hamilton, scoring 92/100 on our CheckWeather Score, ahead of the American at 84. 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.