Canada weather is taking a sharply divided turn this week, with heavy rain affecting parts of Ontario and Quebec while western communities move from an early-season snowfall toward warmer, sunnier conditions.
Environment and Climate Change Canada forecasts issued on Tuesday, October 13, 2026, show a wet pattern across parts of central and eastern Canada, while Calgary and several western locations are set for temperatures near or above seasonal averages.
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Canada Weather: Heavy rain moves across Ontario and Quebec
In eastern Ontario, Tuesday’s forecast includes showers, a risk of thunderstorms and rainfall totals of 30 to 40 millimetres in some areas.
Kingston-area forecasts call for northeast winds becoming southwesterly, with showers continuing into the evening before gradually easing overnight.
Ottawa is also expected to see periods of drizzle and rain, with a risk of thunderstorms and estimated rainfall of 15 to 25 millimetres on Tuesday.
Montreal faces a similarly unsettled day.
Environment Canada forecasts rain at times heavy, with 20 to 30 millimetres expected during the day and another 20 to 30 millimetres possible overnight.
Residents in affected areas should watch for ponding on roads, reduced visibility and rapidly changing driving conditions, particularly during heavier bursts of rain.
Western Canada rebounds after early snow
Parts of Alberta experienced their first accumulating snow of the season over the Thanksgiving weekend, including areas along and west of the Calgary-Edmonton corridor.
Environment Canada previously warned that the heaviest snowfall would target western Alberta, including Grande Cache, Hinton, Nordegg and Rocky Mountain House, where totals of 10 to 25 centimetres were forecast.
That colder spell has now eased in Calgary.
The city’s Tuesday forecast calls for sunshine and a high near 13 C, followed by another sunny day and a high near 17 C on Wednesday.
The shift is also visible in the overnight temperatures.
Calgary is expected to fall to about 2 C Tuesday night before warming again during the day.
In the Rockies, snow cover and colder nights are expected to remain more noticeable, even as daytime temperatures moderate in larger urban centres.
More rain and wind later in the week
The unsettled pattern is not expected to end with Tuesday’s rainfall.
Forecasts for eastern Ontario show another round of rain developing late Thursday and continuing into Friday, with windy conditions and a sharp temperature drop expected by Saturday.
Montreal is also forecast to turn wet again on Friday, with temperatures falling to about 7 C during the day and near zero overnight.
That combination could produce rapidly changing conditions for commuters and travellers, especially in areas where rain changes to showers or flurries as colder air arrives.
What Canadians should watch
Check local Environment Canada alerts before travelling, especially in areas expecting heavy rain or strong winds.
Allow extra time for wet roads, reduced visibility and water pooling in low-lying areas.
Drivers in western and northern regions should be prepared for isolated snow and freezing temperatures overnight.
Residents should secure loose outdoor items before the next windy period reaches parts of Ontario and Quebec.
The current pattern highlights how quickly conditions can change across the country in mid-October.
While parts of the West are moving back toward mild autumn temperatures, central and eastern regions are dealing with repeated rounds of rain before a colder weekend shift.
Frequently Asked Questions
What is the main Canada weather development this week?
Canada is experiencing a sharp regional split, with heavy rain in parts of Ontario and Quebec while western communities move from early-season snow toward warmer conditions.
How much rain is expected in Montreal?
Environment Canada forecasts 20 to 30 millimetres of rain during Tuesday, October 13, with another 20 to 30 millimetres possible overnight.
Will Ottawa see thunderstorms?
Tuesday’s Ottawa forecast includes showers or drizzle, rainfall of 15 to 25 millimetres and a risk of thunderstorms.
Is Calgary still dealing with snow?
Calgary has moved into a milder pattern, with sunshine and temperatures near 13 C Tuesday and 17 C Wednesday, although colder conditions remain possible overnight and in the mountain regions.
Where can Canadians check weather alerts?
Canadians can check current forecasts, watches and warnings through Environment and Climate Change Canada’s official weather service and WeatherCAN app.
Fact-Checked: Key rainfall, snowfall and temperature details were checked against Environment and Climate Change Canada forecast information issued for October 13, 2026.
Disclaimer: Forecast conditions can change quickly, so readers should check local alerts and updated forecasts before travelling.