St. Catharines Weather in October
What's the weather like in St. Catharines (Ontario) in October 2025?
The climate in St. Catharines during October can be summarized as mild and reasonably dry.
October is in the fall / autumn in St. Catharines and is typically the 6th warmest month of the year. Daytime maximum temperatures average around a cool 15°C (59°F), whilst at night 6°C (43°F) is normal.
| Daytime temperature | 14.7°C 58.5°F |
|---|---|
| Nightly temperature | 6.3°C 43.3°F |
| Average temperature | 10.5°C 50.9°F |
| Daily sunshine | 5.2 hrs |
| Avg rainfall | 64 mm 2.5 ins |
| Rainy days | 12 days |
| Sea temperature | 14.1°C 57.3°F |
| Humidity | 76% |
| Windspeed | 14.8kph 9 mph |
On average October is the 5th driest month of the year in St. Catharines with around 64mm 2.5 inches of rain making it a reasonably dry time to visit. This rainfall is typically spread over 12 days, although this may vary considerably.
On the flip side this corresponds to an average of 5.2 hours of sunshine per day.
October temperatures in St. Catharines
October rainfall
October hourly sunshine
The data used in these monthly averages covers a period of over 100 years right up until last year. As such they are a valid prediction of what to expect for the weather in St. Catharines in October 2025.
Other monthly averages
Best places to visit in October
St. Catharines weather stats
| Hottest month: | July | 26.7°C 80.1°F |
|---|---|---|
| Driest month: | January | 50mm 2ins |
| Sunniest month: | July | 9.9hrs |
| Coldest month: | January | -0.7°C 30.7°F |
| Wettest month: | September | 84mm 3.3ins |
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