St. Catharines monthly weather averages

Contents

Average daytime temperature

The bar chart below shows the average monthly peak daytime temperatures at St. Catharines

St. Catharines average temperature chart (Celsius) St. Catharines average temperature chart (Fahrenheit)
Average monthly temperatures in St. Catharines (degrees centigrade and fahrenheit)
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
°C -0.7 -0.1 4.8 11.5 18 23.5 26.7 25.5 21.2 14.5 8.3 2
°F 30.7 31.8 40.6 52.7 64.5 74.3 80 77.9 70.2 58.1 46.9 35.7

Please note: these are the average peak daytime temperatures (usually around mid-afternoon) so do not show daytime / night highs and lows. To see the daily range of temperatures have a look at the temperature max / min chart below.

Average rainfall & rainy days

The graph below shows the average rainfall and number of rainy days per month.

St. Catharines monthly rainfall chart (mm) St. Catharines monthly rainfall chart (inches)
Average monthly rainfall in St. Catharines (mm and inches)
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
mm 50 54 63 68 71 77 64 78 84 64 75 77
inches 2 2.1 2.5 2.7 2.8 3 2.5 3.1 3.3 2.5 2.9 3
Rainy days 13 12 12 12 11 10 9 10 10 12 13 14

Average annual rainfall in St. Catharines: 787.4mm (310 inches)

Average daily sunshine

The bar chart below shows the average daily sunshine hours in St. Catharines

St. Catharines average daily sunshine chart
Average daily sunshine St. Catharines
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Hrs sunshine 3.2 4.1 5.2 6.7 8 9.4 9.9 8.7 6.6 5.2 3 2.4

Day / night temperatures

The graph below shows the daily range of temperatures for each month.

St. Catharines average minimum / maximum temperatures (Celsius) St. Catharines average minimum / maximum temperatures (Fahrenheit)
Maximum and minimum daily temperatures in St. Catharines (degrees centigrade and fahrenheit)
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Min °C -7.5 -7.1 -2.8 2.3 7.5 13.3 16.7 16.1 12.4 6.3 1.6 -4.2
Max °C -0.6 0 5 11.8 18.3 23.8 26.9 25.8 21.5 14.7 8.5 2.2
Min °F 18.6 19.3 27.1 36.1 45.5 55.9 62.1 60.9 54.2 43.3 34.8 24.4
Max °F 24.8 25.7 34 44.6 55.2 65.3 71.2 69.6 62.4 50.9 41 30.2

Sea temperature

The graph below shows the average sea temperature.

St. Catharines average sea temperature chart (Celsius) St. Catharines average sea temperature chart (Fahrenheit)
Average sea temperature around St. Catharines in degrees centigrade and fahrenheit
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
°C 3.3 2.4 2.1 3.1 6.7 13.5 19.7 21.4 19.1 14.1 9.2 5.3
°F 38 36.2 35.8 37.6 44 56.3 67.5 70.5 66.4 57.3 48.6 41.5

Wind speed

The graph below shows the average wind speed.

St. Catharines average winspeed by month (km/h) St. Catharines average winspeed by month (mph)
Average wind speed in St. Catharines (mph and kmh)
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
km/h 19 19 18 17 15 14 13 12 13 15 18 18
mph 12 12 11 11 9 9 8 8 8 9 11 11

A monthly average windspeed of over 16km/h or 10mph suggests a location is fairly windy.

Relative humidity

The graph below shows the average relative humidity.

St. Catharines relative humidity averages
Average relative humidity in St. Catharines
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
78% 77% 75% 69% 67% 70% 69% 73% 75% 76% 78% 80%

Other monthly averages

UV index Best time to go?

Beta

Current (hourly) weather 15 day forecast

St. Catharines weather stats

St. Catharines weather statistics
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
Warmest sea: August 21.4°C 70.5°F
Map showing location of St. Catharines (43.16681, -79.24958) St. Catharines map pin © Google

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