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August Weather in St. Catharines, Canada

Last updated: June 18, 2025

In St. Catharines, Canada, the average temperature in August hovers around 22°C (72°F), creating a pleasant climate for outdoor activities. Expect minimum temperatures of 15°C (59°F) and maximums reaching up to 29°C (84°F). With an average precipitation amount of 80 mm (3.1 in) spread over about 12 days, it’s wise to keep an umbrella handy. Additionally, the air remains comfortably humid, with an average humidity of 72%. Enjoy the beautiful weather while it lasts!

August Temperature in St. Catharines

In August in St. Catharines, the average temperature is 22°C (72°F), with maximums reaching up to 29°C (84°F) and minimums dropping as low as 15°C (59°F). This pleasant climate makes it an ideal destination for travelers looking to enjoy mild and comfortable weather.

August Weather in St. Catharines: Daily Temperature Highs, Lows, and Averages

The chart illustrates August temperature patterns in St. Catharines, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In St. Catharines, August typically has an average temperature of 22°C (72°F), with highs reaching up to 29°C (84°F) and lows dropping to around 15°C (59°F).
JanFebMarAprMayJunJulAugSepOctNovDec282935435365737266554234
Data source: Temperature data for St. Catharines 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 St. Catharines

In St. Catharines in August, the total precipitation amount is 80 mm (3.1 in) spread over 12 days.

August Precipitation Trends in St. Catharines

The chart displays monthly precipitation patterns in St. Catharines, 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 St. Catharines, August typically receives around 80 mm (3.1 inches) of precipitation spread over approximately 12 days.
JanFebMarAprMayJunJulAugSepOctNovDec7786711191018210680691268686
Data source: Precipitation data for August generated using information from the Copernicus Climate Change Service.
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August Humidity in St. Catharines

In St. Catharines in August humidity is 72%. With an average temperature of 22°C (72°F), this humidity feels like you are stepping into a warm, embracing blanket, making traveling feel sweaty and slightly stifling, but the balmy weather is also quite perfect for exploring local attractions.

August Average Humidity in St. Catharines

This chart illustrates the average monthly humidity levels in St. Catharines, 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 St. Catharines is approximately 72%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec91%91%88%88%82%80%77%72%76%83%88%87%
Data source: Humidity data for August generated using information from the Copernicus Climate Change Service.

August UV Index in St. Catharines

In St. Catharines 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 St. Catharines.

Maximum UV Index Levels in St. Catharines for August

The chart shows the monthly maximum UV Index (UVI) for St. Catharines 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 St. Catharines typically reaches 9, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec2458910997532
Data source: St. Catharines 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 St. Catharines Compares to Other Months

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

This table compares monthly weather conditions in St. Catharines, showing how August’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-2°C (29°F)77 mm (3.0 inches)91%low
February Weather-2°C (29°F)86 mm (3.4 inches)91%moderate
March Weather1°C (35°F)71 mm (2.8 inches)88%moderate
April Weather6°C (43°F)119 mm (4.7 inches)88%very high
May Weather12°C (54°F)101 mm (4.0 inches)82%very high
June Weather18°C (65°F)82 mm (3.2 inches)79%very high
July Weather23°C (73°F)106 mm (4.2 inches)77%very high
August Weather22°C (72°F)80 mm (3.1 inches)72%very high
September Weather19°C (66°F)69 mm (2.7 inches)76%high
October Weather13°C (56°F)126 mm (4.9 inches)83%moderate
November Weather5°C (42°F)86 mm (3.4 inches)88%moderate
December Weather1°C (35°F)86 mm (3.4 inches)87%low

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