Grand River South weather
Loading live data…Clear,much the same tomorrow
Env. Canada, the European and the American model agree on a high near 16° in Grand River South today. Tomorrow: partly cloudy, around 18°, with a 2% chance of rain.
Latest for Grand River South: Env. Canada (GEM model): 1° Clear · European (ECMWF): 5° Clear · American (NOAA GFS): 1° Clear.
CheckWeather.io on iPhoneFree. No ads, no account.Grand River South weather in numbers
from 30 years of measured normalsGrand River South swings 35°C across the year, from 25°C highs in July to -10°C lows in February, and July is usually the wettest month in a year that brings about 874 mm of precipitation.
The weather map: all three models at once
Env. Canada, European, American side by side around Grand River South and nearby towns.Live rain radar →Grand River South 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…
Grand River South 10-day forecast, out to 14 days
where the models agree, and where they splitGrand River South, Ontario is at its warmest in Jul (average highs near 25°C) and coldest in Feb (lows around -10°C), with roughly 874 mm of precipitation across the year. Below, compare what Env. Canada, European, American forecast for Grand River South 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.
Grand River South 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 Grand River South has changed since 1995
Grand River South sits in the same roughly 50 km square of NASA's reanalysis as Kitchener. That square ran 0.9°C warmer in 2015-2024 than in 1995-2004. See the full 30-year picture on the Kitchener page.
Which forecast is most accurate in Grand River South?
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.