The most comfortable time to visit Montréal is from late May to mid September. For sun, aim for mid July; for walking, go from September to mid October.
When to go five ratings · thirty-six ten-day sections · click a cell to read it
For sun, go in mid July. It peaks in mid July, at 57. That is a short window, about ten days a year. Avoid October to early May for this: it falls to 0, mostly because it is too cool. The clearest skies come in July, when the sky is typically 41% covered at midday (partly cloudy).
The being outside season here runs from late May to mid September. It peaks in late August, at 75. The weakest stretch is from mid November to early April, when it drops to 0, mostly because it is too cold.
For walking, go from September to mid October, with a second spell from May to mid June. It peaks in late September, at 75. Avoid late November to early March for this: it falls to 0, mostly because it is too cold.
For snow, go from January to mid February. It peaks in mid January, at 60. Avoid May to mid October for this: it falls to 0, mostly because it is too mild. Snow here is a proxy: cold enough for snow to hold, with precipitation likely. It is not measured snow depth.
The year, measured
The average temperature in Montréal over the whole year is 8°C. July is the hottest month, with highs of about 25°C; January is the coldest, with lows of about -8°C. Montréal has no sharply defined rainy season: the chance of rain on a given day runs from 12% in September, the driest month, to 24% in December, the wettest. Winds in Montréal are highest in February, averaging 3.3 m/s (12 km/h), and lightest in September, at 2.3 m/s (8 km/h). The prevailing wind is from the W. The clearest skies in Montréal come in July, when the sky is typically 36% covered; December is the cloudiest month, at 66%.
Month by month Montréal climate by month: average temperatures year round · click a month to read it
| Month | High | Low | Feels like | Chance of rain | Cloud | Wind | Being outside | Sun | Walking |
|---|---|---|---|---|---|---|---|---|---|
| January | -6°C | -8°C | -11°C | 23% | 63% | 3.1 m/s | 0 | 0 | 0 |
| February | -4°C | -8°C | -10°C | 21% | 54% | 3.3 m/s | 0 | 0 | 1 |
| March | 1°C | -3°C | -4°C | 20% | 52% | 3.2 m/s | 0 | 0 | 6 |
| April | 9°C | 3°C | 4°C | 22% | 49% | 3.2 m/s | 6 | 0 | 33 |
| May | 17°C | 11°C | 14°C | 14% | 44% | 2.9 m/s | 42 | 8 | 69 |
| June | 22°C | 17°C | 21°C | 16% | 42% | 2.8 m/s | 69 | 24 | 60 |
| July | 25°C | 20°C | 25°C | 14% | 36% | 2.5 m/s | 68 | 53 | 33 |
| August | 24°C | 18°C | 24°C | 14% | 37% | 2.4 m/s | 73 | 44 | 41 |
| September | 20°C | 14°C | 19°C | 12% | 36% | 2.3 m/s | 65 | 19 | 69 |
| October | 13°C | 8°C | 10°C | 18% | 52% | 2.6 m/s | 26 | 1 | 61 |
| November | 4°C | 1°C | -0°C | 19% | 59% | 2.9 m/s | 4 | 0 | 15 |
| December | -3°C | -5°C | -8°C | 24% | 66% | 3.1 m/s | 0 | 0 | 2 |
High and low are the warmest and coolest of four readings a day — midnight, 6am, noon and 6pm — so a true overnight low can sit a degree or two under them. Chance of rain, cloud and wind are the day’s average; feels-like and the three ratings (each out of 100: Good from 55, Ideal from 80) are read at midday.
Seasons, and the year in short Montréal weather by season
Year round, Montréal has days of about -6°C at their warmest in January, its coolest month, and 25°C in July, its warmest; the coolest hours of the day run from -8°C to 20°C through the year, and the average temperature over the year is 8°C around the clock. Rain is most likely around December and least likely around September. Every figure here is a decade of observations blended into one representative year, so it reads as what this date is usually like, not a forecast for one particular day.
Montréal weather in winterDecember to February
Winter in Montréal has typical daily highs of about -4°C and lows of about -7°C, with a 23% chance of rain on a given day.
Montréal weather in springMarch to May
Spring in Montréal has typical daily highs of about 9°C and lows of about 4°C, with a 19% chance of rain on a given day.
Montréal weather in summerJune to August
Summer in Montréal has typical daily highs of about 24°C and lows of about 18°C, with a 14% chance of rain on a given day.
Montréal weather in autumnSeptember to November
Autumn in Montréal has typical daily highs of about 12°C and lows of about 7°C, with a 16% chance of rain on a given day.
When is the rainy season in Montréal?
Montréal has no sharply defined rainy season: the chance of rain on a given day runs from 12% in September, the driest month, to 24% in December, the wettest.
What time of year is Montréal windiest?
Winds in Montréal are highest in February, averaging 3.3 m/s (12 km/h), and lightest in September, at 2.3 m/s (8 km/h). The prevailing wind is from the W.
What is the average temperature in Montréal year round?
The average temperature in Montréal over the whole year is 8°C. July is the hottest month, with highs of about 25°C; January is the coldest, with lows of about -8°C.
Where to go instead in early January, the weakest time here for being outside
How this is worked out
Every figure is a decade of weather-station observations blended into one typical year, in ten-day sections. The ratings, the chart and the feels-like column are read at midday local solar time. Being outside is the Easy outdoors rating, Sun is Sunbathing and Walking is Active outdoors, each out of 100: Good from 55, Ideal from 80. They describe what a time of year is usually like here, not a forecast. The dotted links open the map at that time of year; set its time of day to midday to see these numbers.