September weather forecast and climate
Sarnia, Canada

What is the temperature in September in Sarnia?

In Sarnia, Canada, in September, the average high-temperature is 21.7°C (71.1°F), and the average low-temperature is 11°C (51.8°F).

What is the average humidity in September in Sarnia?

In Sarnia, the average relative humidity in September is 90.5%.

How much does it rain in Sarnia in September?

In Sarnia, Canada, in September, it is raining for 11.4 days, with typically 104.7mm (4.1") of accumulated precipitation.

What is the wettest month in Sarnia?

September is the month with the most rainfall in Sarnia, Canada. Rain falls for 11.4 days and accumulates 104.7mm (4.1") of precipitation.

Does it snow in Sarnia in September?

In Sarnia, in September, it doesn't snow. In October, it regularly snows.

What is the sea water temperature in September in Sarnia?

In Sarnia, in September, the average water temperature is 20.8°C (69.4°F). For most, swimming in 20.8°C (69.4°F) is not an enjoyable activity. Furthermore, controlling your breathing becomes progressively more difficult as the water temperature decreases from 21°C (69.8°F) to 15°C (59°F).
Average temperature in September - Sarnia, Canada
  • Average high temperature in September: 21.7°C

The warmest month (with the highest average high temperature) is July (26.4°C).
The month with the lowest average high temperature is January (-1.2°C).

  • Average low temperature in September: 11°C

The month with the highest average low temperature is July (15.8°C).
The coldest month (with the lowest average low temperature) is January (-8.3°C).

Average humidity in September - Sarnia, Canada
  • Average humidity in September: 90.5%

The month with the highest relative humidity is August (91.5%).
The month with the lowest relative humidity is February (82.8%).

Average rainfall in September - Sarnia, Canada
  • Average rainfall in September: 104.7mm

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 in September - Sarnia, Canada
  • Average rainfall days in September: 11.4 days

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 in September - Sarnia, Canada
  • Average snowfall in September: 0mm

The month with the highest snowfall is January (310mm).
Months with the lowest snowfall are May, June, July, August and September (0mm).

Average snowfall days in September - Sarnia, Canada
  • Average snowfall days in September: 0 days

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 in September - Sarnia, Canada
  • Average sea temperature in September: 20.8°C

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 in September / Average sunshine in September - Sarnia, Canada
  • Average daylight in September: 12.5h

The month with the longest days is June (Average daylight: 15.3h).
The month with shortest days is December (Average daylight: 9.1h).

  • Average sunshine in September: 6.4h

The month with most sunshine is July (Average sunshine: 9.6h).
The month with least sunshine is December (Average sunshine: 2.2h).

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