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April Weather in Waterloo, Canada

Last updated: June 18, 2025

In April, the average temperature in Waterloo, Canada hovers around 5°C (42°F). While it can dip as low as -10°C (14°F), temperatures may also climb to a pleasant 25°C (77°F). Expect 120 mm (4.7 in) of precipitation over 16 days, with an average humidity of 85% making the air feel quite damp. Prepare accordingly!

April Temperature in Waterloo

In April in Waterloo, the average temperature is 5°C (42°F). Maximum can reach 25°C (77°F), and minimum can be as low as -10°C (14°F). Be prepared for a wide range of temperatures, making it essential to pack layers for your trip.

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

The chart illustrates April 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, April typically has an average temperature of 5°C (42°F), with highs reaching up to 25°C (77°F) and lows dropping to around -10°C (14°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.

April Precipitation in Waterloo

In Waterloo in April, the precipitation amount is 120 mm (4.7 in) spread over 16 days.

April Precipitation Trends in Waterloo

The chart displays monthly precipitation patterns in Waterloo, 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 Waterloo, April typically receives around 120 mm (4.7 inches) of precipitation spread over approximately 16 days.
JanFebMarAprMayJunJulAugSepOctNovDec9389901201071261231288414712586
Data source: Precipitation data for April generated using information from the Copernicus Climate Change Service.
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April Humidity in Waterloo

In Waterloo in April, humidity is 85%. With an average temperature of 5°C (42°F), this humidity feels like a damp chill that clings to your skin, making outdoor activities uncomfortable and requiring extra layers to stay warm while exploring.

April Average Humidity in Waterloo

This chart illustrates the average monthly humidity levels in Waterloo, 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 Waterloo is approximately 85%, 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 April generated using information from the Copernicus Climate Change Service.

April UV Index in Waterloo

In Waterloo in April, the maximum UV index is 7, which corresponds to the high Exposure Category. This means that the time to burn is approximately 25 minutes. For more detailed information, you can check the Hourly UV Index in Waterloo.

Maximum UV Index Levels in Waterloo for April

The chart shows the monthly maximum UV Index (UVI) for Waterloo 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 Waterloo typically reaches 7, which falls under the high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec245799987532
Data source: Waterloo 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 Waterloo Compares to Other Months

Weather in Waterloo varies notably across the year, with each month offering distinct climate conditions. This page compares April’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 April’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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