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Rosemont-La Petite-Patrie weekend weather

This weekend in Rosemont-La Petite-Patrie, Quebec, model by model. Weekend forecasts are far enough out that the models often split - so we show you where.

Weekend

The models centre on about 16° across the weekend. Agreement is medium - plausible, but worth re-checking closer to the day. Rain chance reaches 84% on at least one model.

Today

2026-09-19 — every model, side by side
Env. CanadaGEM model
18°
Clear
High 18°·Low ·Rain 0%
EuropeanECMWF
16°
Cloudy
High 16°·Low ·Rain 0%
AmericanNOAA GFS
14°
Cloudy
High 14°·Low ·Rain 0%

The models range from 14° to 18°. Treat the middle of that range as the likely outcome and keep a backup plan.

Tomorrow

2026-09-20 — every model, side by side
Env. CanadaGEM model
17°
Light rain
High 17°·Low ·Rain 57%
EuropeanECMWF
14°
Light rain
High 14°·Low 10°·Rain 84%
AmericanNOAA GFS
17°
Drizzle
High 17°·Low ·Rain 52%

The models range from 14° to 17°. Treat the middle of that range as the likely outcome and keep a backup plan.

Where the models disagree

temperature and rain, judged separately
DayTemperatureRain
Today±3°14° to 18°models agree0% to 0% chance
Tomorrow±3°14° to 17°±32%52% to 84% chance
Monmodels agree15° to 15°±3%0% to 3% chance
Tue±2°14° to 16°models agree0% to 0% chance
Wed±1°18° to 19°models agree0% to 0% chance

The 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.

Common questions

Will it rain this weekend?
At least one model puts the weekend rain chance as high as 84%. Weekend forecasts sit far enough ahead that models frequently disagree on showers - when they do, no single app can honestly tell you it will or will not rain.
How reliable is a weekend forecast?
It depends how far away the weekend is. Forecast error grows steadily with lead time, so a Saturday forecast made on Friday is far stronger than one made the previous Monday. The honest signal is model agreement: when they converge the forecast is solid, and when they spread the weekend is genuinely uncertain.

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