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August Weather in Waterloo, Canada

Last updated: June 18, 2025

In August, the average temperature in Waterloo, Canada hovers around 19°C (67°F), creating a pleasantly mild atmosphere. Expect a range with minimums dipping to 6°C (43°F) and maximums soaring to 32°C (89°F). During this period, precipitation amounts to 128 mm (5.0 in) over approximately 16 days, contributing to an average humidity of 75% that envelops the locale in a refreshing embrace.

August Temperature in Waterloo

In August in Waterloo, the average temperature is 19°C (67°F). Maximum temperatures can reach 32°C (89°F), while minimums can drop as low as 6°C (43°F). This climate makes Waterloo an ideal destination for travelers seeking a mix of warm days and cool evenings.

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

The chart illustrates August temperature patterns in Waterloo, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Waterloo, August typically has an average temperature of 19°C (67°F), with highs reaching up to 32°C (89°F) and lows dropping to around 6°C (43°F).
JanFebMarAprMayJunJulAugSepOctNovDec172028415563696759483323
Data source: Temperature data for Waterloo 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.

August Precipitation in Waterloo

In Waterloo in August, the precipitation amount is 128 mm (5.0 in) spread over 16 days.

August Precipitation Trends in Waterloo

The chart displays monthly precipitation patterns in Waterloo, 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 Waterloo, August typically receives around 128 mm (5.0 inches) of precipitation spread over approximately 16 days.
JanFebMarAprMayJunJulAugSepOctNovDec9389901201071261231288414712586
Data source: Precipitation data for August generated using information from the Copernicus Climate Change Service.
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August Humidity in Waterloo

In Waterloo in August humidity is 75%. With an average temperature of 19°C (67°F), this humidity feels like a warm embrace, making travel invigorating yet slightly sticky, as you navigate through the vibrant streets or scenic landscapes.

August Average Humidity in Waterloo

This chart illustrates the average monthly humidity levels in Waterloo, 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 Waterloo is approximately 75%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec93%92%86%85%80%74%76%75%78%86%89%89%
Data source: Humidity data for August generated using information from the Copernicus Climate Change Service.

August UV Index in Waterloo

In Waterloo in August, 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 Waterloo.

Maximum UV Index Levels in Waterloo for August

The chart shows the monthly maximum UV Index (UVI) for Waterloo 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 Waterloo typically reaches 8, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec245799987532
Data source: Waterloo 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 Waterloo Compares to Other Months

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

This table compares monthly weather conditions in Waterloo, showing how August’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-8°C (18°F)93 mm (3.7 inches)93%low
February Weather-7°C (20°F)89 mm (3.5 inches)92%moderate
March Weather-2°C (28°F)90 mm (3.5 inches)86%moderate
April Weather5°C (42°F)120 mm (4.7 inches)85%high
May Weather13°C (55°F)106 mm (4.2 inches)80%very high
June Weather17°C (64°F)126 mm (5.0 inches)74%very high
July Weather20°C (69°F)123 mm (4.8 inches)76%very high
August Weather19°C (67°F)128 mm (5.0 inches)75%very high
September Weather15°C (60°F)84 mm (3.3 inches)78%high
October Weather9°C (49°F)147 mm (5.8 inches)86%moderate
November Weather1°C (33°F)125 mm (4.9 inches)88%moderate
December Weather-5°C (23°F)86 mm (3.4 inches)89%low

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