Weatheo

St. Catharines weather by month

Warmest month

July

28°C average high

Coolest month

January

-6°C average low

Wettest month

August

74 mm of rain

Driest month

February

27 mm of rain

Average temperature and rainfall in St. Catharines by month

Averages of the daily highs and lows recorded in each month, with total rainfall, mean humidity and mean wind speed.

MonthAvg highAvg lowRecord low / highRainfallHumidityWind
January0°C-6°C-19°C / 12°C
37 mm
79%20 km/h
February1°C-6°C-17°C / 16°C
27 mm
78%21 km/h
March6°C-2°C-14°C / 22°C
45 mm
72%19 km/h
April11°C3°C-8°C / 24°C
72 mm
73%17 km/h
May19°C9°C2°C / 30°C
60 mm
75%15 km/h
June24°C15°C8°C / 32°C
72 mm
70%13 km/h
July28°C18°C11°C / 32°C
60 mm
75%12 km/h
August26°C17°C11°C / 32°C
74 mm
76%12 km/h
September23°C14°C5°C / 32°C
58 mm
78%13 km/h
October17°C9°C2°C / 29°C
74 mm
78%16 km/h
November10°C4°C-7°C / 25°C
50 mm
75%19 km/h
December4°C-2°C-15°C / 17°C
52 mm
79%20 km/h

Frost and snow-likely months in St. Catharines

Nights in St. Catharines average 2°C or below in 4 months (January, February, March and December). January, February, March and December combine average lows at or below 0°C with 10 mm or more of monthly precipitation, so precipitation then is likely to fall as snow. The coldest month is January with an average low of -6°C and a record low of -19°C.

  • January: average low -6°C, record low -19°C, 37 mm of precipitation — snow-likely
  • February: average low -6°C, record low -17°C, 27 mm of precipitation — snow-likely
  • March: average low -2°C, record low -14°C, 45 mm of precipitation — snow-likely
  • December: average low -2°C, record low -15°C, 52 mm of precipitation — snow-likely

These records carry temperature and precipitation, not snowfall totals.

Best time to visit St. Catharines

The most comfortable time to visit St. Catharines is generally June and August to September, balancing mild daytime temperatures against the driest stretch of the year. The city has strongly marked seasons and rain concentrates around August, totalling about 681 mm a year.

Travellers who prefer heat should aim for July, when highs average 28°C. August is the month to avoid if rain would spoil your plans — it averages 74 mm, roughly 3× the rainfall of the driest month (February).

St. Catharines climate: your questions

Does it snow in St. Catharines?

Yes, in winter: January, February, March and December average lows at or below 0°C with 10 mm or more of monthly precipitation, so some of it falls as snow. The coldest month is January (average low -6°C, record low -19°C). Our records carry temperature and precipitation, not snowfall totals. What is falling now: St. Catharines weather today.

When is it going to snow in St. Catharines this month?

St. Catharines's winter months average lows of -2°C in December, -6°C in January and -6°C in February, with about 116 mm of precipitation across the three; 3 of them sit at or below 0°C, so snow is likely on the colder days. The records hold no snowfall totals. The next 15 days: St. Catharines 10-day forecast.

Which months are best for visiting St. Catharines?

June and August to September are the most comfortable months in St. Catharines, with highs near 24°C. July is the warmest month, averaging 28°C by day; August is the wettest, with 74 mm; and January is the coolest, with lows near -6°C. What it is doing today: St. Catharines weather today.

Source: OpenWeather historical and statistical weather data. Values are long-term averages, not a forecast — see the St. Catharines forecast for what is happening now.

Nearest cities: Monthly climate

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