Monthly weather forecast and climate
Saint Catharines, Canada

The coldest month is January, with an average high-temperature of -0.3°C (31.5°F) and an average low-temperature of -7.4°C (18.7°F). With an average relative humidity of 73%, January is the most humid month.
Weather in January »
In Saint Catharines, the average high-temperature is 0.9°C (33.6°F), and the average low-temperature is -6.8°C (19.8°F). In Saint Catharines, Canada, the average relative humidity is 67.7%.
Weather in February »
The average high-temperature, is 5.5°C (41.9°F), while the average low-temperature is -3.3°C (26.1°F). In March, the average relative humidity is 62.9%.
Weather in March »
The average high-temperature, in April, is 12.4°C (54.3°F), while the average low-temperature is 2.2°C (36°F). In April, the average relative humidity is 57.6%.
Weather in April »
The average high-temperature, is 19.5°C (67.1°F), while the average low-temperature is 7.9°C (46.2°F). With an average relative humidity of 55.9%, May is the least humid month.
Weather in May »
The average high-temperature, is 24.4°C (75.9°F), while the average low-temperature is 13.4°C (56.1°F). The average relative humidity in June is 58.1%.
Weather in June »
The warmest month is July, with an average high-temperature of 27.1°C (80.8°F) and an average low-temperature of 16.6°C (61.9°F). In July, the average relative humidity is 57.5%.
Weather in July »
The average high-temperature, in Saint Catharines, is 25.8°C (78.4°F), while the average low-temperature is 15.7°C (60.3°F). In Saint Catharines, Canada, the average relative humidity is 59%.
Weather in August »
In September, the average high-temperature is 21.6°C (70.9°F), and the average low-temperature is 11.6°C (52.9°F). In Saint Catharines, the average relative humidity in September is 60.5%.
Weather in September »
In October, the average high-temperature is 15.1°C (59.2°F), and the average low-temperature is 5.6°C (42.1°F). The average relative humidity is 64.5%.
Weather in October »
In Saint Catharines, the average high-temperature is 8.4°C (47.1°F), and the average low-temperature is 0.8°C (33.4°F). In Saint Catharines, Canada, the average relative humidity is 69.1%.
Weather in November »
The average high-temperature, is 2.5°C (36.5°F), while the average low-temperature is -4.2°C (24.4°F). The average relative humidity in December is 71.9%.
Weather in December »

What is the coldest month in Saint Catharines?

January is the coldest month in Saint Catharines, Canada, with an average high-temperature of -0.3°C (31.5°F) and an average low-temperature of -7.4°C (18.7°F).

What is the most humid month in Saint Catharines?

The most humid month is January, with an average relative humidity of 73%.

How many days does it rain in Saint Catharines?

In Saint Catharines, during the entire year, the rain falls for 117.2 days and collects up to 754.3mm (29.7") of precipitation.

When does it snow in Saint Catharines?

January through May, October through December are months with snowfall in Saint Catharines, Canada.

How many days does it snow in Saint Catharines?

Throughout the year, there are 42.9 snowfall days, and 1371mm (54") of snow is accumulated.

What is the snowiest month in Saint Catharines?

The month with the most snowfall is January when snow falls for 12.3 days and typically aggregates up to 386mm (15.2") of snow.

What is the month with the least sunshine in Saint Catharines?

The month with the least sunshine is January, with an average of 2.1h of sunshine.

What is the driest month in Saint Catharines?

The month with the least rainfall is February when the rain falls for 5.8 days and typically collects 28.9mm (1.1") of precipitation.

What is the month with the coldest sea water in Saint Catharines?

With an average sea temperature of 1.7°C (35.1°F), February is the month with the coldest seawater in Saint Catharines, Canada. For swimming, this is considered extremely cold, dangerous, and life-threatening. Unless suitably protected with insulated waterproof clothing, hypothermia quickly occurs.

What is the least humid month in Saint Catharines?

With an average relative humidity of 55.9%, May is the least humid month in Saint Catharines, Canada.

When are the longest days in Saint Catharines?

June has the longest days of the year in Saint Catharines, with an average of 15.3h of daylight.

What month has the most sunshine in Saint Catharines?

The month with the most sunshine is June, with an average of 9.3h of sunshine.

What is the warmest month in Saint Catharines?

With an average high-temperature of 27.1°C (80.8°F) and an average low-temperature of 16.6°C (61.9°F), July is the warmest month in Saint Catharines, Canada.

What is the month with the warmest sea water in Saint Catharines?

The month with the warmest seawater in Saint Catharines is August, with an average sea temperature of 23.2°C (73.8°F). Depending on a person's sensitivity to cold, with regards to sunshine, wind, and air temperature, a quick swim in 23.2°C (73.8°F) water may be enjoyable. (FYI: The official water temperature required for the Olympic swimming competition is 25°C (77°F) to 28°C (82.4°F).)

What is the rainiest month in Saint Catharines?

The month with the most rainfall in Saint Catharines is September when the rain falls for 10.9 days and typically aggregates up to 90.6mm (3.6") of precipitation.

What is the month with the shortest days in Saint Catharines?

With an average of 9h of daylight, December has the shortest days of the year.
Average temperature - Saint Catharines, Canada
Average humidity - Saint Catharines, Canada
Average rainfall - Saint Catharines, Canada

The wettest month (with the highest rainfall) is September (90.6mm).
The driest month (with the lowest rainfall) is February (28.9mm).

Average rainfall days - Saint Catharines, Canada

The month with the highest number of rainy days is April (12.4 days).
Months with the lowest number of rainy days are January and February (5.8 days).

Average snowfall - Saint Catharines, Canada
Average snowfall days - Saint Catharines, Canada

The month with the highest number of snowfall days is January (12.3 days).
Months with the lowest number of snowfall days are June, July, August and September (0 days).

Average sea temperature - Saint Catharines, Canada

The best month for swimming (with the highest average sea temperature) is August (23.2°C).
The coldest month (with the lowest average sea temperature) is February (1.7°C).

Average daylight / Average sunshine - Saint Catharines, Canada
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