October Weather in Montreal, Canada

Last updated: April 22, 2025

In October, Montreal experiences a striking transition as autumn settles in, showcasing a maximum temperature of 27°C (80°F), while the average drops to a cool 10°C (50°F). The month can be brisk, with temperatures dipping to a minimum of -4°C (25°F), inviting the vibrant hues of fall foliage. Rain is a regular guest, contributing to a total of 139 mm (5.5 in) of precipitation spread over 13 days, and a humidity level averaging 86%. This blend of chill and moisture creates a unique atmosphere, making October a picturesque time to explore the city's seasonal charm.

October Temperature in Montreal

As October unfolds in Montreal, temperatures begin to dip, marking a distinct shift towards the cool, crisp days of fall. The month typically experiences a minimum temperature of -4°C (25°F), climbing to an average of 10°C (50°F), with a pleasant maximum of 27°C (80°F) on the warmest days. This transitional period highlights the city’s dramatic temperature fluctuations, as the lingering warmth of September gives way to cooler evenings. Observing how the mercury drops, it's evident that October serves as a bridge between the vibrant summer and the approaching chill of winter, where residents can savor the breathtaking fall foliage in a comfortable, albeit brisk, atmosphere.

October Weather in Montreal: Daily Temperature Highs, Lows, and Averages

The chart illustrates October temperature patterns in Montreal, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends.
JanFebMarAprMayJunJulAugSepOctNovDec171929435766727062503524
Data source: Temperature data for Montreal generated using information from the Copernicus Climate Change Service.
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The average of daily temperatures (24 hours) calculated across all days in the month.

October Precipitation in Montreal

In October, Montreal experiences a notable surge in precipitation, with an impressive 139 mm (5.5 in) of rain falling over 13 days. This marks a significant increase compared to the previous month, where September saw only 73 mm (2.9 in) over 9 days. As autumn deepens, October's rainfall becomes a defining characteristic of the season, often bringing vibrant foliage and a brisk chill to the air. The trend indicates that while the summer months of July and August stay relatively wet with 103 mm and 109 mm respectively, October stands out as the wettest month of the fall, preparing the city for the snowy winter ahead. Such precipitation not only nourishes the landscape but also sets the stage for the changing weather patterns that Montrealers must embrace.

October Precipitation Trends in Montreal

The chart displays monthly precipitation patterns in Montreal, with values for each month alongside October's data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how October's conditions compare to those of other months.
JanFebMarAprMayJunJulAugSepOctNovDec848284121971041031097313911888
Data source: Precipitation data for October generated using information from the Copernicus Climate Change Service.
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October Humidity in Montreal

As October rolls into Montreal, the city experiences a noticeable shift in humidity levels, with the average reaching 86%. This jump from September's 78% indicates a gradual reversion to the higher humidity levels seen in the winter months. Interestingly, October stands out as a transitional phase, similar to March and April, where moisture begins to permeate the air again after the drier summer months. Following a steady decline from the summery June peak of 74%, the increase in humidity this fall hints at the approaching winter chill, preparing residents for the cold months ahead. Overall, October captures a balance between the lingering warmth of autumn and the inevitable arrival of winter's embrace.

October Average Humidity in Montreal

This chart illustrates the average monthly humidity levels in Montreal, with October's data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, allowing you to see how October's humidity levels compare to other months.
JanFebMarAprMayJunJulAugSepOctNovDec93%92%86%85%80%74%76%75%78%86%89%89%
Data source: Humidity data for October generated using information from the Copernicus Climate Change Service.

October UV Index in Montreal

As October arrives in Montreal, the UV Index settles at a moderate level of 5, indicating a slight drop from the summer peak of 9 in May and June. This transition not only reflects the waning sunlight but also results in a longer burn time of 30 minutes—a noticeable increase from the 15 minutes seen in the height of summer. While you're less likely to overexpose your skin compared to the scorching months, it's still important to be mindful of sun protection during outdoor activities. With the shifting seasons, the UV Index is dropping steadily, moving from 7 in September to its current position, mirroring the gradual decline in daylight hours. For more insights on UV conditions throughout the year, visit Montreal UV Index.

Maximum UV Index Levels in Montreal for October

The chart shows the monthly maximum UV Index (UVI) for Montreal in October, representing the highest UV radiation level. The UVI measures the intensity of ultraviolet radiation from the sun, indicating the potential risk of sunburn and UV-related health issues.
JanFebMarAprMayJunJulAugSepOctNovDec245799887532
Data source: Montreal October UVI data generated using information from the Copernicus Climate Change Service.

UV Risk Categories

  •  Extreme (11+): Avoid the sun, stay in shade.
  •  Very High (8-10): Limit sun exposure.
  •  High (6-7): Use SPF 30+ and protective clothing.
  •  Moderate (3-5): Midday shade recommended.
  •  Low (0-2): No protection needed.

October Sunshine in Montreal

As October unfolds in Montreal, the city basks in a generous 196 hours of sunshine, a delightful pause before the chill of winter sets in. Just as the vibrant fall foliage begins to paint the landscape, the sun's rays still linger, showcasing a noticeable decline from the sun-drenched summer months, where July and August boast over 340 hours each. This month reflects a transition from the sunniest peak of the year, as September's 281 hours slowly yields to the dimming days ahead in November, with only 146 hours of sunlight. The shift from the vibrant energy of summer to the mellow warmth of autumn creates a unique charm in Montreal, encouraging residents to embrace the crisp air and the stunning hues that October graciously offers.

Monthly Sunshine Duration in Montreal: October Highlighted

The October sunshine duration represents the total number of hours Montreal experiences direct sunlight during the month of October, excluding cloudy or obstructed periods. This chart compares the sunshine duration of October with the other months of the year.
JanFebMarAprMayJunJulAugSepOctNovDec118h155h236h226h285h321h342h326h281h196h146h143h
Data source: Montreal October Sunshine duration data generated using information from the Copernicus Climate Change Service.

Chance of Sun in Montreal During October

As October unfolds in Montreal, the likelihood of sunny weather takes a notable dip, with only 29% chance of sunshine. This stands in stark contrast to the sunnier months of August and September, which enjoy considerably higher probabilities at 45% and 41%, respectively. Interestingly, as the year progresses from the bright days of summer to the crisp autumn air, the trend shows a gradual decline in sunlit days, reaching its annual low in October and mirroring the wintery gloom found in January and December. With the onset of fall, residents and visitors may find themselves embracing the beauty of the season’s vibrant foliage while preparing for the cloudy days ahead.

Percentage of Sunny Days in October in Montreal

The chart illustrates the percentage of sunny days in Montreal throughout the year, with October highlighted. It highlights the variation in sunshine across each month and provides an overview of the typical frequency of sunny days, offering insights into how often Montreal experiences clear skies throughout the year.
JanFebMarAprMayJunJulAugSepOctNovDec37%39%43%36%41%36%33%46%41%29%45%29%
Data source: Montreal October chance of sun data, generated using information from the Copernicus Climate Change Service.

Daylight Hours in Montreal in October

As October arrives in Montreal, the vibrant colors of fall are mirrored by a notable shift in daylight duration. With 10 hours of daylight, the city sees a gentle decline from the longer summer days, which peaked at 15 hours in June and July. This gradual reduction is part of a clear seasonal trend, as the daylight hours decrease from the sun-drenched months of May and June towards the shorter days of winter. October serves as a reminder of the diminishing sunlight, especially after enjoying the 14 hours of daylight in August. Embracing the crisp autumn air, Montrealiers can savor these fleeting hours before they fall to 9 hours in November, ushering in the colder months ahead.

Average Daylight Hours in Montreal for October

The chart illustrates the variation in daylight duration in Montreal throughout the year, with October highlighted. It shows the monthly changes in daylight hours, calculated by summing the hours between sunrise and sunset.
JanFebMarAprMayJunJulAugSepOctNovDec9h 8m10h 23m11h 57m13h 33m14h 55m15h 36m15h 14m14h12h 28m10h 52m9h 28m8h 45m
Data source: Montreal daylight hours, calculated by summing the hours between sunrise and sunset for each day.

October Winds in Montreal

In Montreal, October ushers in a gentle breeze with an average wind speed of 3.2 m/s (7 mph), mirroring the calmer winds of July and August. As the city transitions from the vibrant hues of autumn leaves, the wind patterns reveal a subtle dip, reminiscent of early spring months where winds are softer yet refreshing. This decrease is notable compared to the brisker winds of March and December, which often pick up to around 4 m/s. While October carries with it a sense of change, its winds remain moderate, inviting residents to enjoy the crisp air and stunning fall scenery without the harshness of winter's approach.

Average October Wind Speed in Montreal

The chart displays monthly wind speed patterns in Montreal, with values for each month shown alongside October's data, which is highlighted for easy comparison. It illustrates the average wind speed, offering insights into how October's wind conditions compare to the rest of the year.
JanFebMarAprMayJunJulAugSepOctNovDec3.23.64.53.53.43.73.03.03.43.2 m/s3.44.0
Data source: Montreal October wind data, generated using information from the Copernicus Climate Change Service.

How October Weather in Montreal Compares to Other Months

The weather in Montreal changes throughout the year, offering a unique experience in each season. Below is a month-by-month comparison of October's weather with other months, highlighting differences in temperature, precipitation, and other key factors. Click on each section to discover seasonal trends in Montreal and find detailed weather information for every month.

October and January present stark contrasts in weather patterns. In October, temperatures range from a chilly -4°C (25°F) at night to a pleasant 27°C (80°F) during the day, with an average of 10°C (50°F). This month experiences significant rainfall, totaling 139 mm over 13 days, along with a high humidity level of 86%. Conversely, January brought a deep chill, with temperatures plunging to a minimum of -32°C (-25°F) and averaging -8°C (17°F), peaking at just 9°C (49°F). Precipitation is lower in January, at 84 mm over 11 days, but the humidity is noticeably higher at 93%. For more detailed information about January conditions, visit Montreal weather in January.

October and February present stark contrasts in weather, reflecting the transition from autumn to winter. In October, temperatures range from a minimum of -4°C (25°F) to a maximum of 27°C (80°F), with an average of around 10°C (50°F). The month experiences significant precipitation, totaling 139 mm (5.5 in) over approximately 13 days, accompanied by a relatively high humidity of 86%. Conversely, February is much colder, with temperatures dipping as low as -25°C (-13°F) and averaging -7°C (20°F), peaking at just 13°C (56°F). While February sees a lower total precipitation of 82 mm (3.2 in) across 12 days, humidity rises slightly to 92%. For more detailed insights on February weather, you can explore Montreal weather in February.

When comparing the weather in October and March, it’s evident that October tends to be milder and more temperate. In October, temperatures range from a chilly minimum of -4°C (25°F) to a comfortable maximum of 27°C (80°F), with an average of 10°C (50°F). In contrast, March experiences much colder conditions, with temperatures dropping as low as -23°C (-9°F) and only peaking at 20°C (69°F), averaging around -2°C (29°F). Additionally, October has greater precipitation, averaging 139 mm (5.5 in) over 13 days, compared to March's 84 mm (3.3 in) over 11 days. Both months share a high humidity level of 86%, but the overall feel of October is distinctly warmer and more inviting. For more details on March weather, you can check Montreal weather in March.

In comparing October and April weather, we see notable differences in temperature and precipitation. October features a wider temperature range, with minimums of -4°C (25°F) and maximums reaching 27°C (80°F), while April experiences lower extremes, ranging from -10°C (14°F) to a maximum of 25°C (78°F). Despite October having slightly higher average temperatures at 10°C (50°F) compared to April’s 6°C (43°F), both months exhibit similar humidity levels and days of precipitation—October averages 139 mm (5.5 in) over 13 days, and April has 121 mm (4.7 in) over 12 days. This makes both months relatively wet, but with distinct temperature profiles. For more details on April's weather specifics, you can check Montreal weather in April.

In October, temperatures in Montreal can fluctuate significantly, with minimums dropping as low as -4°C (25°F) and an average high of 27°C (80°F). The month experiences considerable precipitation, averaging 139 mm (5.5 in) over 13 days, and features high humidity at 86%. In contrast, May offers a slightly milder climate, with temperatures ranging from a low of -1°C (30°F) to a warm maximum of 36°C (97°F). With significantly less rainfall at 97 mm (3.8 in) over 11 days and a lower humidity level of 80%, May presents a more comfortable atmosphere. For more detailed information on May weather, you can visit Montreal weather in May.

When comparing the weather in October and June, notable contrasts emerge. October experiences a wider temperature range, with minimums dropping as low as -4°C (25°F) and maximums reaching 27°C (80°F), while the average temperature hovers around a cooler 10°C (50°F). In contrast, June maintains milder conditions, with minimum temperatures at 3°C (38°F) and maximums soaring up to 34°C (94°F), leading to a much warmer average of 19°C (67°F). While October sees higher precipitation levels at 139 mm (5.5 in) over 13 days and a higher humidity of 86%, June is slightly drier with 103 mm (4.1 in) across 12 days and a more comfortable humidity of 74%. For a deeper dive into June’s weather specifics, visit Montreal weather in June.

When comparing the weather in October and July, we see significant contrasts in temperature and humidity. October experiences a broader range of temperatures, with minimums dipping to -4°C (25°F), and average temperatures around 10°C (50°F), peaking at 27°C (80°F). In contrast, July boasts milder conditions with minimum temperatures of 10°C (50°F) and averages reaching 22°C (72°F), with highs up to 35°C (95°F). Precipitation is also notable, as October receives more rain (139 mm, or 5.5 in) over 13 days, while July gets less (103 mm, or 4.1 in) across 14 days. Additionally, October's humidity is higher at 86%, compared to July’s 76%. For a deeper dive into the specifics, you can check out Montreal weather in July.

In comparison to August, October exhibits a more variable temperature range, with minimums dropping to -4°C (25°F) and maximums reaching 27°C (80°F), contrasting sharply with August's warmer temperatures, which range from a minimum of 8°C (47°F) to a maximum of 33°C (92°F). Although both months experience around 13 days of precipitation, October sees a higher total of 139 mm (5.5 inches) compared to August's 109 mm (4.3 inches), contributing to a noticeable increase in humidity at 86% in October versus 75% in August. For more detailed information, you can check Montreal weather in August.

In comparing the weather between September and October, October sees a notable drop in average temperatures, with a minimum of -4°C (25°F) compared to September's milder 2°C (35°F). The maximum temperature in October peaks at 27°C (80°F), significantly lower than September's high of 32°C (90°F). Additionally, October experiences higher precipitation, measuring 139 mm (5.5 in) over 13 days, whereas September records only 73 mm (2.9 in) across 9 days. Humidity also rises in October, averaging 86% compared to September's 78%, contributing to a more damp and cool atmosphere as fall progresses. For a closer look at September weather specifics, visit Montreal weather in September.

October and November present notable contrasts in weather. October tends to be milder, with temperatures ranging from a minimum of -4°C (25°F) to a maximum of 27°C (80°F), averaging around 10°C (50°F). This month sees higher precipitation at 139 mm (5.5 in) over 13 days, accompanied by a humidity level of 86%. In contrast, November experiences significantly colder temperatures, with lows dipping to -17°C (1°F) and an average of 2°C (35°F), peaking at 23°C (73°F). Although November has slightly less precipitation at 118 mm (4.6 in) also over 13 days, it maintains a similar humidity level of 88%. For more details on what to expect, check out Montreal weather in November.

October and December exhibit notably contrasting weather patterns. October experiences milder temperatures, ranging from a minimum of -4°C (25°F) to a maximum of 27°C (80°F), with an average temperature of 10°C (50°F). In this month, precipitation is relatively high, totaling 139 mm (5.5 in) over approximately 13 days, and humidity levels stand at 86%. In contrast, December ushers in the chill of winter, showcasing much lower temperatures with a minimum of -26°C (-15°F) and an average of -5°C (24°F), peaking at a maximum of 14°C (57°F). Although December has less total precipitation at 88 mm (3.5 in) over 12 days, the humidity is slightly higher at 89%. For a detailed look at what to expect, check out Montreal weather in December.

Compare Montreal's Climate with Cities Worldwide

Conclusion: What to Expect From October Weather in Montreal

As October unfolds in Montreal, the city experiences a striking transition from the warmth of summer to the chill of winter. With average temperatures dipping to a crisp 10°C, this month showcases a more varied climate compared to the relatively stable conditions of previous months. While you can still feel a touch of warmth with occasional highs of 27°C, the cool nights may bring temperatures as low as -4°C. October also marks a notable increase in precipitation, with 139 mm of rain over about 13 days, contributing to the month’s overall 86% humidity. This combination of cooler air and increased moisture sets the stage for stunning autumn foliage, making October a uniquely beautiful time to explore the city. To learn more about seasonal trends, visit Montreal Climate.