Saint Catharines (ON) Weather & Climate: Best Time to Visit

In Saint Catharines, temperatures differ significantly between summer and winter months. Typically, average maximum daytime temperatures range from a comfortable 26°C (79°F) in July to a very cold 1°C (34°F) in the coolest month, February.

Nights vary from 20°C (68°F) in July to around -6°C (21°F) during the colder months.

Check out our detailed temperature page for more information.

Temperature ranges by month

Saint Catharines experiences significant rain/snowfall throughout the year, averaging 1086 mm (43 in) of precipitation annually. Precipitation levels in Saint Catharines remain relatively steady throughout the year. April has the most rain, with 105 mm (4.1 in) over 12 days. In the driest month February, this drops slightly to 73 mm (2.9 in), making the city's climate fairly predictable. For more details, please visit our Saint Catharines Precipitation page.

The mean monthly precipitation over the year, including rain, hail, and snow

The average number of days each month with precipitation

For those who appreciate different seasons, Saint Catharines serves as an ideal destination. Expect longer, more sun-filled days in July with an average of 10.2 hours of sunshine daily, and embrace the darker days in December, offering only 2.3 hours of daily sunlight.

Visit our detailed sunshine hours page for more information.

Monthly hours of sunshine

Daily hours of sunshine

Daily percentage of sunshine

The relative humidity is high throughout the year in Saint Catharines.

The city experiences its highest humidity in December, reaching 77%. In April, the humidity drops to its lowest level at 67%. What does this mean? Read our detailed page on humidity levels for further details.

Relative humidity over the year