Sarnia
Canada
Long-term weather forecast
Long-term weather forecast

Monthly weather forecast and climate
Sarnia, Canada

January, like December, is a freezing cold winter month in Sarnia, Canada, with temperature in the range of an average high of -1.2°C (29.8°F) and an average low of -8.3°C (17.1°F). The coldest month 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). Weather in January »
The last month of the winter, February, is a cold month in Sarnia, Canada, with average temperature fluctuating between -7.5°C (18.5°F) and 0.2°C (32.4°F). In February, the average high-temperature is practically the same as in January - a cold 0.2°C (32.4°F). Weather in February »

The first month of the spring, March, is also a wintry month in Sarnia, Canada, with average temperature varying between 4.9°C (40.8°F) and -3.6°C (25.5°F). In Sarnia, the average high-temperature in March slightly increases, from 0.2°C (32.4°F) in February, to a still wintry 4.9°C (40.8°F). Weather in March »

April is a cool spring month in Sarnia, Canada, with temperature in the range of an average high of 12°C (53.6°F) and an average low of 1.7°C (35.1°F). In April, the average high-temperature rises, from a wintry 4.9°C (40.8°F) in March, to a fresh 12°C (53.6°F). Weather in April »

The last month of the spring, May, is a comfortable month in Sarnia, Canada, with average temperature fluctuating between 7.1°C (44.8°F) and 18.3°C (64.9°F). In Sarnia, the average high-temperature increases, from a cool 12°C (53.6°F) in April, to a comfortable 18.3°C (64.9°F). Weather in May »

The first month of the summer, June, is a warm month in Sarnia, Canada, with average temperature fluctuating between 23.8°C (74.8°F) and 12.6°C (54.7°F). In Sarnia, the average high-temperature in June rises, from an enjoyable 18.3°C (64.9°F) in May, to a moderately hot 23.8°C (74.8°F). Weather in June »

July, like June, in Sarnia, Canada, is a moderately hot summer month, with temperature in the range of an average high of 26.4°C (79.5°F) and an average low of 15.8°C (60.4°F). July is the warmest month, with an average high-temperature of 26.4°C (79.5°F) and an average low-temperature of 15.8°C (60.4°F). Weather in July »

The last month of the summer, August, is also a moderately hot month in Sarnia, Canada, with average temperature ranging between min 14.8°C (58.6°F) and max 25.2°C (77.4°F). In August, the average high-temperature is essentially the same as in July - a still warm 25.2°C (77.4°F). Weather in August »

September, the first month of the autumn, in Sarnia, is also an agreeable month, with average temperature ranging between min 11°C (51.8°F) and max 21.7°C (71.1°F). In Sarnia, the average high-temperature in September slightly decreases, from a warm 25.2°C (77.4°F) in August, to a pleasant 21.7°C (71.1°F). Weather in September »

October, like September, is a moderate autumn month in Sarnia, Canada, with temperature in the range of an average high of 14.7°C (58.5°F) and an average low of 5.3°C (41.5°F). In Sarnia, the average high-temperature in October decreases, from a pleasant 21.7°C (71.1°F) in September, to a moderate 14.7°C (58.5°F). Weather in October »

The last month of the autumn, November, is also a frosty month in Sarnia, Canada, with average temperature fluctuating between 0.6°C (33.1°F) and 8°C (46.4°F). In Sarnia, the average high-temperature decreases, from a moderate 14.7°C (58.5°F) in October, to a frosty 8°C (46.4°F). Weather in November »

The first month of the winter, December, is also a wintry month in Sarnia, Canada, with average temperature ranging between min -5.1°C (22.8°F) and max 1.5°C (34.7°F). In Sarnia, the average high-temperature decreases, from a chilly 8°C (46.4°F) in November, to a cold 1.5°C (34.7°F). Weather in December »

What is the coldest month in Sarnia?

January is the coldest month, 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?

In Sarnia, during the entire year, the rain falls for 116.9 days and collects up to 770.1mm (30.3") of precipitation.

What is the driest month in Sarnia?

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

When does it snow in Sarnia?

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

How many days does it snow in Sarnia?

In Sarnia, 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. Snow falls for 11.3 days and accumulates 310mm (12.2") of snow.

What is the least humid month in Sarnia?

February is the least humid month, with an average relative humidity of 82.8%.

What months are 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 in Sarnia. For swimming, this is considered extremely cold, dangerous, and life-threatening. Unless suitably protected with insulated waterproof clothing, hypothermia quickly occurs.

When are the longest days in Sarnia?

The month with the longest days is June, with an average of 15.3h of daylight.

What is the warmest month in Sarnia?

The warmest month in Sarnia is July, 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 has the most sunshine in Sarnia?

July has the most sunshine of the year, with an average of 9.6h of sunshine.

What is the most humid month in Sarnia?

August is the most humid month, with an average relative humidity of 91.5%.

When is the sea warmest in Sarnia?

The month with the warmest seawater in Sarnia, Canada, is August, with an average sea temperature of 23.2°C (73.8°F). A person's cold intolerance, with sunshine, wind, and air temperature, are essential factors for enjoying swimming in 23.2°C (73.8°F) water.

What is the rainiest 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.

What is the month with the shortest days in Sarnia?

The month with the shortest days is December, with an average of 9.1h of daylight.

What is the month with the least sunshine in Sarnia?

With an average of 2.2h of sunshine, December has the least sunshine of the year in Sarnia.
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