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Climate & Weather Averages in Sarnia, Ontario, Canada

Currently: 30 °F. Light snow. Mostly cloudy. (Weather station: Sarnia Airport, Canada). See more current weather

Annual Weather Averages Near Sarnia

Averages are for Sarnia Airport, which is 4 miles from Sarnia.

Based on weather reports collected during 1985–2015.

All Year Climate & Weather Averages in Sarnia

High Temp: 80 °F

Low Temp: 18 °F

Mean Temp: 48 °F

Precipitation: 1.50"

Humidity: 74%

Dew Point: 40 °F

Wind: 9 mph

Pressure: 30.03 "Hg

Visibility: 10 mi

January Climate & Weather Averages in Sarnia

High Temp: 31 °F

Low Temp: 18 °F

Mean Temp: 25 °F

Precipitation: 1.52"

Humidity: 79%

Dew Point: 19 °F

Wind: 11 mph

Pressure: 30.05 "Hg

Visibility: 9 mi

February Climate & Weather Averages in Sarnia

High Temp: 32 °F

Low Temp: 18 °F

Mean Temp: 25 °F

Precipitation: 0.95"

Humidity: 76%

Dew Point: 19 °F

Wind: 10 mph

Pressure: 30.07 "Hg

Visibility: 10 mi

March Climate & Weather Averages in Sarnia

High Temp: 41 °F

Low Temp: 26 °F

Mean Temp: 34 °F

Precipitation: 1.03"

Humidity: 74%

Dew Point: 26 °F

Wind: 10 mph

Pressure: 30.06 "Hg

Visibility: 10 mi

April Climate & Weather Averages in Sarnia

High Temp: 54 °F

Low Temp: 36 °F

Mean Temp: 45 °F

Precipitation: 1.52"

Humidity: 69%

Dew Point: 35 °F

Wind: 10 mph

Pressure: 29.98 "Hg

Visibility: 11 mi

May Climate & Weather Averages in Sarnia

High Temp: 66 °F

Low Temp: 46 °F

Mean Temp: 56 °F

Precipitation: 1.77"

Humidity: 70%

Dew Point: 46 °F

Wind: 9 mph

Pressure: 29.99 "Hg

Visibility: 11 mi

June Climate & Weather Averages in Sarnia

High Temp: 75 °F

Low Temp: 56 °F

Mean Temp: 66 °F

Precipitation: 1.62"

Humidity: 72%

Dew Point: 57 °F

Wind: 7 mph

Pressure: 29.96 "Hg

Visibility: 11 mi

July Climate & Weather Averages in Sarnia

High Temp: 80 °F

Low Temp: 61 °F

Mean Temp: 70 °F

Precipitation: 1.67"

Humidity: 73%

Dew Point: 62 °F

Wind: 7 mph

Pressure: 29.98 "Hg

Visibility: 11 mi

August Climate & Weather Averages in Sarnia

High Temp: 78 °F

Low Temp: 60 °F

Mean Temp: 69 °F

Precipitation: 1.21"

Humidity: 76%

Dew Point: 61 °F

Wind: 7 mph

Pressure: 30.02 "Hg

Visibility: 10 mi

September Climate & Weather Averages in Sarnia

High Temp: 72 °F

Low Temp: 53 °F

Mean Temp: 62 °F

Precipitation: 1.82"

Humidity: 76%

Dew Point: 54 °F

Wind: 7 mph

Pressure: 30.05 "Hg

Visibility: 10 mi

October Climate & Weather Averages in Sarnia

High Temp: 59 °F

Low Temp: 43 °F

Mean Temp: 51 °F

Precipitation: 1.48"

Humidity: 74%

Dew Point: 43 °F

Wind: 9 mph

Pressure: 30.04 "Hg

Visibility: 11 mi

November Climate & Weather Averages in Sarnia

High Temp: 47 °F

Low Temp: 33 °F

Mean Temp: 40 °F

Precipitation: 1.56"

Humidity: 76%

Dew Point: 33 °F

Wind: 10 mph

Pressure: 30.06 "Hg

Visibility: 10 mi

December Climate & Weather Averages in Sarnia

High Temp: 35 °F

Low Temp: 24 °F

Mean Temp: 30 °F

Precipitation: 1.80"

Humidity: 80%

Dew Point: 25 °F

Wind: 10 mph

Pressure: 30.07 "Hg

Visibility: 9 mi

Quick Climate Info

Hottest MonthJuly (70 °F avg)
Coldest MonthJanuary (25 °F avg)
Wettest MonthSeptember (1.82" avg)
Windiest MonthJanuary (11 mph avg)
Annual precip.17.96" (per year)

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