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Saint Catharines (ON) Weather & Climate: Best Time to Visit
Average temperatures, rainfall, sunshine and the best time to visit Saint Catharines.
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Climate overview of Saint Catharines
The climate in Saint Catharines, Ontario, Canada, is marked by large temperature swings across the seasons, ranging from 26°C (79°F) in July to 1°C (34°F) in January.
The city receives considerable rain/snowfall, with around 1086 mm (43 in) annually. April is the wettest month. It has warm summers and very cold winters. The most sunshine falls in July, with an average of 10.2 hours of daily sunshine.
Saint Catharines Weather by Month
Pick a month to see the average temperature, rainfall and sunshine in Saint Catharines - and find the best time to visit.
Monthly Temperature in Saint Catharines
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, January.
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
Rainfall in Saint Catharines
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
Sunshine Hours in Saint Catharines
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
Data from: Buffalo, the United States of America (42 KM, 26 Miles).
Daily hours of sunshine
Data from: Buffalo, the United States of America (42 KM, 26 Miles).
Daily percentage of sunshine
Data from: Buffalo, the United States of America (42 KM, 26 Miles).
Humidity in Saint Catharines by Month
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
Data from: Buffalo, the United States of America (42 KM, 26 Miles).
Best Time to Visit Saint Catharines
For comfortable weather, consider visiting Saint Catharines in July, August and September. Conditions are usually least favourable in January, February, March, April, November and December.
Monthly ratings reflect general weather comfort, based on daytime temperature and rainfall. Swimming and winter conditions are highlighted separately where relevant.
Jan
cold
Feb
cold
Mar
cold
Apr
wet
May
good
Jun
very good
Jul
excellent
Aug
excellent
Sep
excellent
Oct
good
Nov
cold
Dec
cold
- Best overall: July, August and September
- Warmest weather: July and August
- Most sunshine: July
- Fewest rainy days: June, July, August and September
- Seasonal pattern: Warm summers and very cold winters
- Coldest conditions: January, with freezing nights around -6°C (21°F).
Frequently asked questions about the climate in Saint Catharines
What is the best time to visit Saint Catharines?
July, August and September typically offer the most optimal weather in Saint Catharines. In contrast, January, February, March, April, November and December tend to have less optimal conditions. Saint Catharines has warm summers and very cold winters.
What temperatures can I expect in Saint Catharines?
Daytime highs range from 1°C (34°F) in January to 26°C (79°F) in July. Nighttime lows range from -6°C (21°F) to 20°C (68°F). Temperatures vary considerably through the year.
How much rain does Saint Catharines get?
Annual rainfall is around 1086 mm (43 in). April is the wettest month with 105 mm (4.1 in), while February is the driest with 73 mm (2.9 in).
How sunny is Saint Catharines?
Saint Catharines receives around 2,211 hours of sunshine per year. July is the sunniest month with 307 hours, while December is the cloudiest with just 68 hours. Overall, Saint Catharines enjoys abundant sunshine.
Saint Catharines 3-Day Forecast
Saint Catharines on the map
Saint Catharines is highlighted - select any city to see its climate.
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