April Weather in Alliston, Canada

Last updated: June 18, 2025

In April, the average temperature in Alliston, Canada hovers around 5°C (42°F), making it a chilly time of year. Daily temperatures can vary dramatically, with a minimum of -9°C (16°F) and a potential maximum of 25°C (78°F). Expect 102 mm (4.0 in) of precipitation spread over approximately 13 days, contributing to an average humidity of 82%—perfect for cozy indoor activities!

April Temperature in Alliston

In April in Alliston, the average temperature is 5°C (42°F), with maximums reaching up to 25°C (78°F) and minimums dropping as low as -9°C (16°F). It's essential to pack for a variety of weather conditions, as this time of year can showcase both warmth and chill.

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

The chart illustrates April temperature patterns in Alliston, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Alliston, April typically has an average temperature of 5°C (42°F), with highs reaching up to 25°C (78°F) and lows dropping to around -9°C (16°F).

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

April Precipitation in Alliston

In Alliston in April, precipitation amounts to 102 mm (4.0 in) over the course of 13 days.

April Precipitation Trends in Alliston

The chart displays monthly precipitation patterns in Alliston, 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 Alliston, April typically receives around 102 mm (4.0 inches) of precipitation spread over approximately 13 days.

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

Choose your preferred precipitation unit

Millimeters (mm) Inches (in)

April Humidity in Alliston

In Alliston in April humidity is 82%. With an average temperature of 5°C (42°F), this humidity feels like a wet chill that seeps into your bones, making outdoor exploration uncomfortable and dampening the joy of traveling.

April Average Humidity in Alliston

This chart illustrates the average monthly humidity levels in Alliston, 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 Alliston is approximately 82%, 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 Alliston

In Alliston 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 Alliston.

Maximum UV Index Levels in Alliston for April

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

Data source: Alliston 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 Alliston Compares to Other Months

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

This table compares monthly weather conditions in Alliston, 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)	59 mm (2.3 inches)	93%	low
February Weather	-5°C (23°F)	62 mm (2.5 inches)	94%	moderate
March Weather	-1°C (31°F)	58 mm (2.3 inches)	87%	moderate
April Weather	5°C (42°F)	102 mm (4.0 inches)	82%	very high
May Weather	13°C (55°F)	99 mm (3.9 inches)	74%	very high
June Weather	18°C (65°F)	94 mm (3.7 inches)	68%	very high
July Weather	21°C (71°F)	90 mm (3.5 inches)	67%	very high
August Weather	20°C (69°F)	96 mm (3.8 inches)	67%	very high
September Weather	16°C (61°F)	68 mm (2.7 inches)	74%	high
October Weather	10°C (50°F)	98 mm (3.9 inches)	83%	moderate
November Weather	2°C (36°F)	76 mm (3.0 inches)	89%	moderate
December Weather	-3°C (28°F)	69 mm (2.7 inches)	91%	low