July Weather in St. Catharines, Canada

Last updated: June 18, 2025

In July, the average temperature in St. Catharines, Canada is a pleasant 23°C (73°F). You can expect a minimum of 16°C (61°F) and a maximum of 30°C (87°F), creating ideal conditions for outdoor activities. However, be prepared for some rain, as the area receives an average precipitation of 106 mm (4.2 in) over 12 days. With an average humidity of 77%, it's wise to stay hydrated and enjoy the lush surroundings!

July Temperature in St. Catharines

In July in St. Catharines, the average temperature is 23°C (73°F). The maximum can reach 30°C (87°F), while the minimum can be as low as 16°C (61°F). This comfortable climate makes St. Catharines an ideal destination for travelers seeking pleasant weather during their visit.

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

The chart illustrates July 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, July typically has an average temperature of 23°C (73°F), with highs reaching up to 30°C (87°F) and lows dropping to around 16°C (61°F).

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

July Precipitation in St. Catharines

In St. Catharines in July, the precipitation amount is 106 mm (4.2 in), occurring over a span of 12 days.

July Precipitation Trends in St. Catharines

The chart displays monthly precipitation patterns in St. Catharines, with values for each month alongside July’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how July’s conditions compare to those of other months. In St. Catharines, July typically receives around 106 mm (4.2 inches) of precipitation spread over approximately 12 days.

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

Choose your preferred precipitation unit

Millimeters (mm) Inches (in)

July Humidity in St. Catharines

In St. Catharines in July, humidity is 77%. With an average temperature of 23°C (73°F), this humidity feels like a warm, sticky embrace, making travel somewhat uncomfortable but bearable. It's essential to stay hydrated and take frequent breaks to enjoy the sights while avoiding overheating.

July Average Humidity in St. Catharines

This chart illustrates the average monthly humidity levels in St. Catharines, with July’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In July, average humidity in St. Catharines is approximately 77%, offering insight into how humid the weather typically is during this month.

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

July UV Index in St. Catharines

In St. Catharines in July, 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 July

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

Data source: St. Catharines July 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 July 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 July’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 July’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
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 Weather	1°C (35°F)	71 mm (2.8 inches)	88%	moderate
April Weather	6°C (43°F)	119 mm (4.7 inches)	88%	very high
May Weather	12°C (54°F)	101 mm (4.0 inches)	82%	very high
June Weather	18°C (65°F)	82 mm (3.2 inches)	79%	very high
July Weather	23°C (73°F)	106 mm (4.2 inches)	77%	very high
August Weather	22°C (72°F)	80 mm (3.1 inches)	72%	very high
September Weather	19°C (66°F)	69 mm (2.7 inches)	76%	high
October Weather	13°C (56°F)	126 mm (4.9 inches)	83%	moderate
November Weather	5°C (42°F)	86 mm (3.4 inches)	88%	moderate
December Weather	1°C (35°F)	86 mm (3.4 inches)	87%	low