Montreal records about 1000mm of rain across roughly 113 wet days a year, which is a 31% chance on an average day. November is the wettest month at 93mm (9% of the annual total) and February the driest at 62mm. Local rain type: snow mix. Montreal gets heavy snow from December through March and thunderstorms in summer. The Underground City (RÉSO) provides 33km of weather-free walking.
Chance of rain on an average day: 31%
Rainfall climatology for Montreal. The live hour-by-hour answer for today loads at the top of this page from Open-Meteo and refreshes through the day — the figures below describe a typical year, not today.
Last updated: · Live forecast data refreshes hourly.
| Annual rainfall | 1000mm |
| Rain days per year | 113 |
| Odds on an average day | 31% |
| Wettest month | November — 93mm over 11 days |
| Driest month | February — 62mm over 7 days |
| Rain type | snow mix |
| Best dry window | Late May through June offers warm, increasingly dry conditions after the spring thaw. |
| Worst rain window | December through March buries the city in snow, while July-August brings humid thunderstorms. |
November delivers 50% more rain than February (93mm vs 62mm). That gap is the difference between planning around showers and ignoring them.
No single month holds more than 9% of the annual total, so rain in Montreal is spread through the year — there is no season you can rely on being dry.
Montreal rain typically comes as discrete showers, so a compact umbrella and a flexible plan are usually enough.
Rain falls on about 11 days in November against 7 in February — the frequency swing matters more for planning than the millimetre totals.
Climate normals. Use them to judge whether today's live forecast at the top of the page is typical or unusual for the season.
| Month | Rainfall | Rain days | Chance on a given day | Highs |
|---|---|---|---|---|
| January | 78mm | 9 | 30% | -4°C |
| February | 62mm | 7 | 23% | -4°C |
| March | 74mm | 9 | 30% | 0°C |
| April | 78mm | 9 | 30% | 6°C |
| May | 76mm | 9 | 30% | 15°C |
| June | 87mm | 10 | 33% | 21°C |
| July | 91mm | 10 | 33% | 25°C |
| August | 92mm | 11 | 37% | 25°C |
| September | 88mm | 10 | 33% | 21°C |
| October | 83mm | 10 | 33% | 15°C |
| November | 93mm | 11 | 37% | 6°C |
| December | 81mm | 9 | 30% | 0°C |
Rain probability is the chance that at least 0.2mm falls at your location — not how long it rains. For Montreal we combine the hourly probability curve, expected volume in millimetres, and the city's own rainfall record into a single umbrella verdict.
| Factor | Weight | What it measures |
|---|---|---|
| Hourly probability | 40% | Peak and sustained chance of measurable rain across the next 24 hours. |
| Expected volume | 30% | Total millimetres, which separates a passing shower from a genuine soaking. |
| Timing & duration | 20% | When rain starts, when it eases, and the longest continuous dry window. |
| Local rain type | 10% | Drizzle, brief showers, thunderstorms or monsoon — each needs different gear. |
Live hourly values come from Open-Meteo and refresh through the day. Monthly rainfall figures are climate normals, so they describe a typical year rather than a forecast.
Montreal records rain on roughly 113 days a year — about a 31% chance on any given day — totalling around 1000mm.
November, with about 93mm over 11 rain days. That is 9% of the entire year's rainfall in a single month.
February is the driest month at 62mm across roughly 7 days. Late May through June offers warm, increasingly dry conditions after the spring thaw.
Montreal gets heavy snow from December through March and thunderstorms in summer. The Underground City (RÉSO) provides 33km of weather-free walking.
No. Probability is the chance that at least 0.2mm of rain falls at your location at some point in the period. Check the expected millimetres alongside it: 40% with 0.4mm is a passing shower, 40% with 12mm is a soaking.