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October Weather in Markham, Canada

Last updated: June 18, 2025

In October, the average temperature in Markham, Canada hovers around 12°C (54°F), with a minimum dipping to 1°C (35°F) and a maximum reaching 25°C (77°F). Expect moderate rainfall, with approximately 115 mm (4.5 in) of precipitation spread over 14 days. The air tends to be quite humid, boasting an average humidity level of 83%.

October Temperature in Markham

In October in Markham, the average temperature is 12°C (54°F), with a maximum that can reach 25°C (77°F) and a minimum that can drop to 1°C (35°F). Overall, this range makes it an ideal time for travelers to enjoy mild weather while exploring the area.

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

The chart illustrates October temperature patterns in Markham, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Markham, October typically has an average temperature of 12°C (54°F), with highs reaching up to 25°C (77°F) and lows dropping to around 1°C (35°F).
JanFebMarAprMayJunJulAugSepOctNovDec272733415061707065544032
Data source: Temperature data for Markham 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 Markham

In Markham in October, the precipitation amount is 115 mm (4.5 in) over the course of 14 days.

October Precipitation Trends in Markham

The chart displays monthly precipitation patterns in Markham, 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 Markham, October typically receives around 115 mm (4.5 inches) of precipitation spread over approximately 14 days.
JanFebMarAprMayJunJulAugSepOctNovDec808375118103807376691159691
Data source: Precipitation data for October generated using information from the Copernicus Climate Change Service.
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October Humidity in Markham

In Markham in October humidity is 83%. With an average temperature of 12°C (54°F), this humidity feels like a heavy blanket wrapping around you, making outdoor exploration feel sticky and uncomfortable, which can dampen the excitement of traveling.

October Average Humidity in Markham

This chart illustrates the average monthly humidity levels in Markham, 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 Markham is approximately 83%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec91%91%88%88%82%80%77%72%76%83%88%87%
Data source: Humidity data for October generated using information from the Copernicus Climate Change Service.

October UV Index in Markham

In Markham 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 Markham.

Maximum UV Index Levels in Markham for October

The chart shows the monthly maximum UV Index (UVI) for Markham 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 Markham typically reaches 5, which falls under the moderate exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec245899987532
Data source: Markham 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 Markham Compares to Other Months

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

This table compares monthly weather conditions in Markham, showing how October’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-3°C (27°F)80 mm (3.2 inches)91%low
February Weather-3°C (28°F)83 mm (3.3 inches)91%moderate
March Weather0°C (33°F)75 mm (2.9 inches)88%moderate
April Weather5°C (41°F)118 mm (4.6 inches)88%very high
May Weather10°C (50°F)103 mm (4.1 inches)82%very high
June Weather16°C (62°F)80 mm (3.1 inches)79%very high
July Weather21°C (71°F)73 mm (2.9 inches)77%very high
August Weather21°C (71°F)76 mm (3.0 inches)72%very high
September Weather18°C (65°F)69 mm (2.7 inches)76%high
October Weather12°C (54°F)115 mm (4.5 inches)83%moderate
November Weather4°C (40°F)96 mm (3.8 inches)88%moderate
December Weather0°C (33°F)91 mm (3.6 inches)87%low

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