Weather in Montréal in October

A hard month. October is a hard month in Montréal, and worth planning around. Highs sit at 12.4 °C and the day is short; this is an indoors-with-excursions month, not an outdoors-all-day one.

October ranks 6 of 12 in Montréal: past the worst of the year but short of September, which is the month to book if the dates are open.

Rain on 14 days, 3 of them heavy. Enough to need a plan B, not enough to need a plan around it. Layers, and a genuinely waterproof outer — at 12.4 °C the difference between a good day and a miserable one is entirely down to what you are wearing.

What the averages hide

Averages flatten a month, and this one hides a few things: 8 nights fall below freezing. Across the twenty years measured, the hottest October day reached 25.2 °C and the coldest night fell to -5.7 °C, and the wettest single day dropped 48 mm — roughly 42% of the month's rain in one day.

October is statistically steady but not small: the year-to-year variation is modest in relative terms, yet the wettest October on record still delivered 212 mm against 45 mm in the driest. In a month this wet, even a tame spread is a lot of rain in absolute terms — the 114 mm average is a reasonable planning figure, not a promise.

Wind is light at 10.5 km/h, so the temperature on the page is close to the temperature on your skin, and humidity runs at 81%, which at 12.4 °C means damp rather than muggy — the kind of cold that gets into a coat and stays there.

How October sits in the year

The month is on the way down: 8.9 °C cooler than September, with November dropping another 8.2 °C. The first week and the last are not the same trip.

Daylight in October

11 hours of daylight, losing 1.5 hours across the month. That is between Montréal's extremes of 15.7 and 8.7 hours, so days are long enough not to constrain the plan.

An inland climate

Montréal has no sea to moderate it, and it shows: 43.1 °C separates the hottest afternoon of the year from the coldest night. That is a genuinely continental range, and it means summer and winter here are barely the same place.

How busy it gets

Shoulder. The value months — prices ease off and you get the place closer to itself.

Crowd levels are estimated from climate desirability and school-holiday calendars, not from visitor numbers.

October in Montréal versus nearby

If Montréal is one option among several, the nearby comparison is worth making. Sherbrooke is close enough to be a coin toss — within a degree on temperature, 2 days more rain. Ottawa is close enough to be a coin toss — within a degree on temperature, the same number of rain days.

So: October is a compromise. September is 29 points better and is what Montréal is actually like at its best — worth moving the trip for if that is possible, and worth adjusting expectations for if it is not.

Every month in Montréal

See all twelve months in Montréal, or where else to go in October.