Saint John weather
Loading live data…Clear,much the same tomorrow
Env. Canada, the European and the American model put Saint John's high today between 14° and 17°, a 3° split. Tomorrow looks cloudy around 14°, with a 48% chance of rain.
CheckWeather.io on iPhoneFree. No ads, no account.Saint John weather in numbers
measured normals and 10 years of recorded weatherSaint John swings 33°C across the year, from 24°C highs in July to -9°C lows in February, and June is usually the wettest month in a year that brings about 1386 mm of precipitation. Over 10 years of recorded weather it averages 8 days a year at 25°C or above, 133 frost nights, and rain on 138 days.
Day counts are from the ERA5 reanalysis for Saint John’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 Saint John and nearby towns.Live rain radar →Saint John 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…
Saint John 10-day forecast, out to 14 days
where the models agree, and where they splitSaint John, New Brunswick is at its warmest in Jul (average highs near 24°C) and coldest in Feb (lows around -9°C), with roughly 1386 mm of precipitation across the year. Below, compare what Env. Canada, European, American forecast for Saint John 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.
Saint John climate by month
average daytime high and overnight low across a typical yearWhich forecast is most accurate in Saint John?
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.