Ottawa monthly weather averages

Average daytime temperature

The bar chart below shows the average monthly peak daytime temperatures at Ottawa

Ottawa average temperature chart (Celsius) Ottawa average temperature chart (Fahrenheit)
Average monthly temperatures in Ottawa (degrees centigrade and fahrenheit)
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
°C -6.6 -4.7 1.4 10.4 18.1 23.3 25.9 24.3 19.4 12.5 4.4 -3.8
°F 20.1 23.5 34.5 50.6 64.6 73.9 78.7 75.7 66.8 54.6 40 25.1

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.

Ottawa monthly rainfall chart (mm) Ottawa monthly rainfall chart (inches)
Average monthly rainfall in Ottawa (mm and inches)
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
mm 59 58 62 65 73 83 88 86 80 71 84 82
inches 2.3 2.3 2.4 2.6 2.9 3.3 3.5 3.4 3.2 2.8 3.3 3.2
Rainy days 14 12 11 11 12 12 11 11 12 12 14 16

Average daily sunshine

The bar chart below shows the average daily sunshine hours in Ottawa

Ottawa average daily sunshine chart
Average daily sunshine Ottawa
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Hrs sunshine 3.7 4.9 5.5 6.7 7.9 9 9.7 8.3 6.2 4.8 3.1 2.8

Day / night temperatures

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

Ottawa average minimum / maximum temperatures (Celsius) Ottawa average minimum / maximum temperatures (Fahrenheit)
Maximum and minimum daily temperatures in Ottawa (degrees centigrade and fahrenheit)
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Min °C -15.6 -14.5 -7.6 0.4 7 12.3 15 13.9 9.4 3.7 -2 -11.4
Max °C -6.4 -4.5 1.6 10.6 18.4 23.6 26.2 24.6 19.6 12.8 4.6 -3.7
Min °F 3.9 5.9 18.3 32.7 44.6 54.1 59 56.9 48.9 38.6 28.4 11.6
Max °F 12.2 14.9 26.6 41.9 54.9 64.2 69.1 66.6 58.1 46.8 34.3 18.5

Sea temperature

The graph below shows the average sea temperature.

Ottawa average sea temperature chart (Celsius) Ottawa average sea temperature chart (Fahrenheit)
Average sea temperature around Ottawa in degrees centigrade and fahrenheit
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
°C 3.5 2.5 2.2 2.9 5.6 11 16.1 18 16.1 12 8.1 5.1
°F 38.2 36.5 35.9 37.2 42.1 51.7 61 64.4 60.9 53.5 46.6 41.1

Wind speed

The graph below shows the average wind speed.

Ottawa average winspeed by month (km/h) Ottawa average winspeed by month (mph)
Average wind speed in Ottawa (mph and kmh)
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
km/h 15 14 15 15 13 12 10 10 11 13 14 14
mph 9 9 9 9 8 7 7 7 7 8 9 9

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.

Ottawa relative humidity averages
Average relative humidity in Ottawa
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
73% 70% 68% 63% 63% 68% 69% 73% 76% 74% 78% 78%
Ottawa

Other monthly averages

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Ottawa weather stats

Ottawa weather statistics
Hottest month: July 25.9°C 78.6°F
Driest month: February 58mm 2.3ins
Sunniest month: July 9.7hrs
Coldest month: January -6.6°C 20.1°F
Wettest month: July 88mm 3.5ins
Warmest sea: August 18°C 64.4°F
Map showing location of Ottawa (45.41117, -75.69812)

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