August Weather in Guelph, Canada

Last updated: June 18, 2025

In August, the average temperature in Guelph, Canada hovers around 20°C (69°F). This pleasant month can see temperatures dip to a minimum of 7°C (45°F), while highs may reach up to 32°C (89°F). Expect 95 mm (3.7 in) of precipitation spread over 12 days, contributing to an average humidity level of 80%.

August Temperature in Guelph

In August in Guelph, the average temperature is 20°C (69°F), with maximums reaching up to 32°C (89°F) and minimums dropping as low as 7°C (45°F). It's a great time to visit Guelph for mild weather and pleasant outdoor activities.

August Weather in Guelph: Daily Temperature Highs, Lows, and Averages

The chart illustrates August temperature patterns in Guelph, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Guelph, August typically has an average temperature of 20°C (69°F), with highs reaching up to 32°C (89°F) and lows dropping to around 7°C (45°F).

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

August Precipitation in Guelph

In Guelph in August, the precipitation amount is 95 mm (3.7 in) over the course of 12 days.

August Precipitation Trends in Guelph

The chart displays monthly precipitation patterns in Guelph, with values for each month alongside August’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how August’s conditions compare to those of other months. In Guelph, August typically receives around 95 mm (3.7 inches) of precipitation spread over approximately 12 days.

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

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Millimeters (mm) Inches (in)

August Humidity in Guelph

In Guelph in August, humidity is 80%. With an average temperature of 20°C (69°F), this humidity feels like a warm blanket enveloping you, making every step slightly more challenging as you navigate the air that clings to your skin, often leaving you longing for a cool breeze while exploring the sights.

August Average Humidity in Guelph

This chart illustrates the average monthly humidity levels in Guelph, with August’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In August, average humidity in Guelph is approximately 80%, offering insight into how humid the weather typically is during this month.

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

August UV Index in Guelph

In Guelph in August, the maximum UV index is 9, which corresponds to a very high Exposure Category. The time to burn is just 15 minutes, so it's essential to take precautions. For detailed information, you can check the Hourly UV Index in Guelph.

Maximum UV Index Levels in Guelph for August

The chart shows the monthly maximum UV Index (UVI) for Guelph in August, 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 August, the maximum UV index in Guelph typically reaches 9, which falls under the very high exposure category.

Data source: Guelph August 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 August Weather in Guelph Compares to Other Months

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

This table compares monthly weather conditions in Guelph, showing how August’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	-5°C (23°F)	70 mm (2.8 inches)	90%	low
February Weather	-5°C (24°F)	75 mm (2.9 inches)	90%	moderate
March Weather	0°C (32°F)	65 mm (2.5 inches)	87%	moderate
April Weather	6°C (42°F)	103 mm (4.1 inches)	87%	very high
May Weather	13°C (56°F)	97 mm (3.8 inches)	82%	very high
June Weather	19°C (66°F)	105 mm (4.1 inches)	81%	very high
July Weather	22°C (71°F)	77 mm (3.0 inches)	79%	very high
August Weather	20°C (69°F)	95 mm (3.7 inches)	80%	very high
September Weather	17°C (62°F)	71 mm (2.8 inches)	81%	high
October Weather	10°C (50°F)	101 mm (4.0 inches)	84%	moderate
November Weather	2°C (36°F)	78 mm (3.1 inches)	88%	moderate
December Weather	-2°C (29°F)	72 mm (2.8 inches)	87%	low