April Weather in Harriston, Canada

Last updated: June 18, 2025

In April, the average temperature in Harriston, Canada hovers around 5°C (41°F). Prepare for a range, with minimums dipping to -9°C (17°F) and maximums soaring up to 25°C (78°F). Expect a fair amount of precipitation, totaling 107 mm (4.2 in) over 14 days, accompanied by an average humidity of 87%.

April Temperature in Harriston

In April in Harriston, the average temperature is 5°C (41°F). Maximums can reach 25°C (78°F), while minimums can drop as low as -9°C (17°F). Pack accordingly to enjoy a range of weather during your visit!

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

The chart illustrates April 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, April typically has an average temperature of 5°C (41°F), with highs reaching up to 25°C (78°F) and lows dropping to around -9°C (17°F).

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

April Precipitation in Harriston

In Harriston in April, the precipitation amount is 107 mm (4.2 in) spread over a period of 14 days.

April Precipitation Trends in Harriston

The chart displays monthly precipitation patterns in Harriston, with values for each month alongside April’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how April’s conditions compare to those of other months. In Harriston, April typically receives around 107 mm (4.2 inches) of precipitation spread over approximately 14 days.

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

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Millimeters (mm) Inches (in)

April Humidity in Harriston

In Harriston in April humidity is 87%. With an average temperature of 5°C (41°F), this humidity feels like a heavy, damp blanket enveloping you, making every step seem laborious and the chill more biting, which can be quite challenging for traveling.

April Average Humidity in Harriston

This chart illustrates the average monthly humidity levels in Harriston, with April’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In April, average humidity in Harriston is approximately 87%, offering insight into how humid the weather typically is during this month.

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

April UV Index in Harriston

In Harriston in April, the maximum UV index is 8, which corresponds to a very high Exposure Category. This means that the time to burn is only 15 minutes. For more detailed information, you can refer to the Hourly UV Index in Harriston.

Maximum UV Index Levels in Harriston for April

The chart shows the monthly maximum UV Index (UVI) for Harriston in April, 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 April, the maximum UV index in Harriston typically reaches 8, which falls under the very high exposure category.

Data source: Harriston April 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 April 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 April’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 April’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