Sarnia Weather in September

What's the weather like in Sarnia (Ontario) in September 2024?

The climate in Sarnia during September can be summarized as mild and reasonably dry.

September is in the fall / autumn in Sarnia and is typically the 4th warmest month of the year. Daytime maximum temperatures average around 22°C (72°F), whilst at night 12°C (54°F) is normal.

Sarnia weather averages (imperial / metric)
Daytime temperature 22.1°C 71.8°F
Nightly temperature 12.1°C 53.8°F
Average temperature 17.1°C 62.8°F
Daily sunshine 6.6 hrs
Avg rainfall 76 mm 3 ins
Rainy days 9 days
Sea temperature 20.5°C 68.9°F
Humidity 77%
Windspeed 13kph 8 mph

On average September is the 3rd wettest month of the year in Sarnia with around 76mm 3 inches of rain making it a reasonably dry time to visit. This rainfall is typically spread over 9 days, although this may vary considerably.

On the flip side this corresponds to an average of 6.6 hours of sunshine per day.

September temperatures in Sarnia

Sarnia average temperature in September

September rainfall

Sarnia average rain in September

September hourly sunshine

Sarnia average rain in September

The data used in these monthly averages covers a period of over 100 years right up until last year. As such they are a valid prediction of what to expect for the weather in Sarnia in September 2024.

Other monthly averages

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UV index Best time to go?

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
Map showing location of Sarnia (42.97866, -82.40407) Sarnia map pin © Google

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