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October Weather in Montreal, United States

Last updated: June 24, 2025

In October, the average temperature in Montreal, United States hovers around 8°C (46°F), with extremes ranging from a brisk -8°C (18°F) to a pleasant 26°C (79°F). Expect 112 mm (4.4 in) of precipitation spread over approximately 15 days, leading to an average humidity level of 81%. Stay prepared for a mix of chilly and warm spells!

October Temperature in Montreal

In October in Montreal, the average temperature is 8°C (46°F), with a maximum that can reach 26°C (79°F) and a minimum as low as -8°C (18°F). This makes it essential to pack layers to prepare for both mild and chilly weather.

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. In Montreal, October typically has an average temperature of 8°C (46°F), with highs reaching up to 26°C (79°F) and lows dropping to around -8°C (18°F).
JanFebMarAprMayJunJulAugSepOctNovDec161528385465706660463122
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 Montreal in October, the precipitation amount is 112 mm (4.4 in) spread over a period of 15 days.

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. In Montreal, October typically receives around 112 mm (4.4 inches) of precipitation spread over approximately 15 days.
JanFebMarAprMayJunJulAugSepOctNovDec395252878711187110941126174
Data source: Precipitation data for October generated using information from the Copernicus Climate Change Service.
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October Humidity in Montreal

In Montreal in October humidity is 81%. With an average temperature of 8°C (46°F), this humidity feels like walking through a damp blanket, making traveling uncomfortable and leading to a persistent chill that seeps into your bones.

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, helping you understand how conditions vary by season. In October, average humidity in Montreal is approximately 81%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec93%93%89%85%76%71%70%71%73%82%88%91%
Data source: Humidity data for October generated using information from the Copernicus Climate Change Service.

October UV Index in Montreal

In Montreal in October, the maximum UV index reaches 5, which corresponds to a moderate Exposure Category. Under these conditions, the estimated time to burn is approximately 30 minutes. For more details, you can check the Hourly UV Index in Montreal.

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. In October, the maximum UV index in Montreal typically reaches 5, which falls under the moderate exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec2458810987532
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.

How October Weather in Montreal Compares to Other Months

Weather in Montreal varies notably across the year, with each month offering distinct climate conditions. This page compares October’s weather to other months in Montreal, focusing on differences in temperature, rainfall, humidity, and UV levels.

This table compares monthly weather conditions in Montreal, showing how October’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-9°C (16°F)39 mm (1.5 inches)93%low
February Weather-9°C (16°F)52 mm (2.1 inches)93%moderate
March Weather-2°C (28°F)52 mm (2.0 inches)89%moderate
April Weather3°C (38°F)87 mm (3.4 inches)85%very high
May Weather12°C (54°F)87 mm (3.4 inches)76%very high
June Weather18°C (65°F)111 mm (4.4 inches)71%very high
July Weather21°C (70°F)87 mm (3.4 inches)70%very high
August Weather19°C (67°F)110 mm (4.3 inches)71%very high
September Weather15°C (60°F)94 mm (3.7 inches)73%high
October Weather8°C (46°F)112 mm (4.4 inches)81%moderate
November Weather-1°C (31°F)61 mm (2.4 inches)87%moderate
December Weather-6°C (22°F)74 mm (2.9 inches)91%low

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