Monthly weather forecast and climate
Sarnia, Canada

What is the coldest month in Sarnia?

The coldest month in Sarnia is January, with an average high-temperature of -1.2°C (29.8°F) and an average low-temperature of -8.3°C (17.1°F).

How many days does it rain in Sarnia?

Throughout the year, there are 116.9 rainfall days, and 770.1mm (30.3") of precipitation is accumulated.

What is the driest month in Sarnia?

The month with the least rainfall in Sarnia, Canada, is January when the rain falls for 5 days and typically collects 22.9mm (0.9") of precipitation.

When does it snow in Sarnia?

Months with snowfall in Sarnia are January through April, October through December.

How much does it snow in Sarnia?

In Sarnia, Canada, during the entire year, snow falls for 41.3 days, and aggregates up to 1119.8mm (44.1") of snow.

What is the snowiest month in Sarnia?

January is the month with the most snowfall in Sarnia. Snow falls for 11.3 days and accumulates 310mm (12.2") of snow.

When is the sea coldest in Sarnia?

February and March, with an average sea temperature of 0.3°C (32.5°F), are months with the coldest seawater. For swimming, this is considered life-threatening and very dangerous. The water feels painfully cold, and hyperventilation quickly occurs. A specialized swimsuit is mandatory to reduce thermal damage.

What is the warmest month in Sarnia?

July is the warmest month in Sarnia, Canada, with an average high-temperature of 26.4°C (79.5°F) and an average low-temperature of 15.8°C (60.4°F).

What month is the sea warmest in Sarnia?

With an average sea temperature of 23.2°C (73.8°F), August is the month with the warmest seawater in Sarnia. For individuals prone to feeling cold, swimming in 23°C (73.4°F) is still regarded as intolerable. A wetsuit is not a necessity, but sunshine, wind, and air temperature are essential factors for relishing swimming at 23.2°C (73.8°F).

What is the wettest month in Sarnia?

The month with the most rainfall in Sarnia is September when the rain falls for 11.4 days and typically aggregates up to 104.7mm (4.1") of precipitation.
Average humidity - Sarnia, Canada
Average rainfall - Sarnia, Canada

The wettest month (with the highest rainfall) is September (104.7mm).
The driest month (with the lowest rainfall) is January (22.9mm).

Average rainfall days - Sarnia, Canada

The month with the highest number of rainy days is May (12.6 days).
The month with the lowest number of rainy days is February (4.9 days).

Average snowfall - Sarnia, Canada
Average snowfall days - Sarnia, Canada

The month with the highest number of snowfall days is January (11.3 days).
Months with the lowest number of snowfall days are May, June, July, August and September (0 days).

Average sea temperature - Sarnia, Canada

The best month for swimming (with the highest average sea temperature) is August (23.2°C).
Coldest months (with the lowest average sea temperature) are February and March (0.3°C).

Average daylight / Average sunshine - Sarnia, Canada
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