Sarnia monthly weather averages

Contents

Average daytime temperature

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

Sarnia average temperature chart (Celsius) Sarnia average temperature chart (Fahrenheit)
Average monthly temperatures in Sarnia (degrees centigrade and fahrenheit)
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
°C -1.9 -0.9 4.7 11.8 18.4 23.9 26.5 25.8 21.9 15.4 7.7 1.1
°F 28.6 30.3 40.4 53.2 65.1 75 79.7 78.4 71.4 59.7 45.9 33.9

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.

Sarnia monthly rainfall chart (mm) Sarnia monthly rainfall chart (inches)
Average monthly rainfall in Sarnia (mm and inches)
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
mm 57 54 63 75 68 82 71 71 76 60 78 75
inches 2.2 2.1 2.5 2.9 2.7 3.2 2.8 2.8 3 2.3 3.1 3
Rainy days 11 10 11 11 10 10 9 9 9 10 11 12

Average annual rainfall in Sarnia: 788.6mm (310.5 inches)

Average daily sunshine

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

Sarnia average daily sunshine chart
Average daily sunshine Sarnia
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Hrs sunshine 3.1 4.1 4.7 6.8 8.4 9.5 9.9 8.2 6.6 5.5 3.1 2.3

Day / night temperatures

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

Sarnia average minimum / maximum temperatures (Celsius) Sarnia average minimum / maximum temperatures (Fahrenheit)
Maximum and minimum daily temperatures in Sarnia (degrees centigrade and fahrenheit)
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Min °C -8.7 -8.3 -3.1 2.2 7.8 13.3 16.3 15.6 12.1 6.4 1.1 -5
Max °C -1.7 -0.8 4.9 12 18.7 24.2 26.8 26 22.1 15.6 7.9 1.2
Min °F 16.3 17.2 26.5 36 46 55.9 61.3 60.1 53.8 43.5 34 23
Max °F 22.6 23.9 33.6 44.8 55.8 65.7 70.7 69.4 62.8 51.8 40.1 28.6

Sea temperature

The graph below shows the average sea temperature.

Sarnia average sea temperature chart (Celsius) Sarnia average sea temperature chart (Fahrenheit)
Average sea temperature around Sarnia in degrees centigrade and fahrenheit
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
°C 2.4 1.5 1.6 3.8 9 15.8 21.6 23 20.5 15.1 9.6 4.9
°F 36.3 34.7 34.8 38.9 48.1 60.5 70.9 73.5 68.9 59.1 49.2 40.9

Wind speed

The graph below shows the average wind speed.

Sarnia average winspeed by month (km/h) Sarnia average winspeed by month (mph)
Average wind speed in Sarnia (mph and kmh)
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
km/h 19 18 18 18 16 14 13 12 13 15 17 18
mph 12 11 11 11 10 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.

Sarnia relative humidity averages
Average relative humidity in Sarnia
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
78% 77% 75% 69% 67% 70% 71% 75% 77% 75% 78% 80%

Other monthly averages

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Beta

Current (hourly) weather 15 day forecast

Sarnia weather stats

Sarnia weather statistics
Hottest month: July 26.5°C 79.7°F
Driest month: February 54mm 2.1ins
Sunniest month: July 9.9hrs
Coldest month: January -1.9°C 28.6°F
Wettest month: June 82mm 3.2ins
Warmest sea: August 23°C 73.4°F
Map showing location of Sarnia (42.97866, -82.40407) Sarnia map pin © Google

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