October Weather in Harriston, Canada

Last updated: June 18, 2025

In Harriston, Canada, the average temperature in October is a brisk 9°C (49°F). While you may experience lows of -4°C (26°F), sunny days can reach up to a warm 27°C (80°F). Expect 111 mm (4.4 in) of precipitation over approximately 15 days, with an average humidity of 84% adding to the region’s distinctive atmosphere.

October Temperature in Harriston

In October in Harriston, the average temperature is 9°C (49°F), with maximums reaching 27°C (80°F) and minimums dropping as low as -4°C (26°F). This varied climate makes Harriston an ideal destination for travelers looking to experience a mix of pleasant warmth and crisp coolness.

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

The chart illustrates October temperature patterns in Harriston, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Harriston, October typically has an average temperature of 9°C (49°F), with highs reaching up to 27°C (80°F) and lows dropping to around -4°C (26°F).

Data source: Temperature data for Harriston generated using information from the Copernicus Climate Change Service.

October Precipitation in Harriston

In Harriston in October, the total precipitation amount is 111 mm (4.4 in) spread over 15 days.

October Precipitation Trends in Harriston

The chart displays monthly precipitation patterns in Harriston, 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 Harriston, October typically receives around 111 mm (4.4 inches) of precipitation spread over approximately 15 days.

Data source: Precipitation data for October generated using information from the Copernicus Climate Change Service.

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Millimeters (mm) Inches (in)

October Humidity in Harriston

In Harriston in October, humidity is 84%. With an average temperature of 9°C (49°F), this humidity feels like a chilly embrace, making travel uncomfortable as the dampness seeps into your clothes and lingers in the air, leaving you feeling cool yet clammy.

October Average Humidity in Harriston

This chart illustrates the average monthly humidity levels in Harriston, 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 Harriston is approximately 84%, offering insight into how humid the weather typically is during this month.

Data source: Humidity data for October generated using information from the Copernicus Climate Change Service.

October UV Index in Harriston

In Harriston 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 Harriston.

Maximum UV Index Levels in Harriston for October

The chart shows the monthly maximum UV Index (UVI) for Harriston 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 Harriston typically reaches 5, which falls under the moderate exposure category.

Data source: Harriston 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 Harriston Compares to Other Months

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

This table compares monthly weather conditions in Harriston, showing how October’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	-6°C (21°F)	76 mm (3.0 inches)	90%	low
February Weather	-6°C (22°F)	83 mm (3.3 inches)	90%	moderate
March Weather	-1°C (30°F)	70 mm (2.8 inches)	87%	moderate
April Weather	5°C (41°F)	107 mm (4.2 inches)	87%	very high
May Weather	12°C (54°F)	103 mm (4.1 inches)	82%	very high
June Weather	18°C (64°F)	106 mm (4.2 inches)	81%	very high
July Weather	20°C (69°F)	89 mm (3.5 inches)	79%	very high
August Weather	19°C (67°F)	110 mm (4.3 inches)	80%	very high
September Weather	15°C (60°F)	94 mm (3.7 inches)	81%	high
October Weather	9°C (49°F)	111 mm (4.4 inches)	84%	moderate
November Weather	1°C (35°F)	95 mm (3.8 inches)	88%	moderate
December Weather	-3°C (28°F)	83 mm (3.2 inches)	87%	low