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Weather in Sarnia for September 2027

Your guide to Sarnia weather in September - trends and predictions

    Temperatures

  • In general, the average temperature in Sarnia at the beginning of September is 25 °C. As the month progressed, temperatures tended to significantly cool down, reaching an average of 20.4 °C by the end of September.

    • Rain 🌧️

  • With an average of 5 rainy days, Sarnia experiences minimal rainfall in September.

    • More

  • Is September a good time to visit Sarnia? check out the best time to travel to Sarnia page.

  • ✨ Is September a good time to visit Sarnia? – Ask the AI Weatherman

Average dry days
25
Dry days
Average rainy days
5
Rainy days
Average snowy days
0
Snow days
Average temperatures
22°/14°
Temperatures
Average wind speed
20 km/h
Avg max wind
Average humidity
75 %
Avg humidity

Sarnia Weather September

Move between months or click on a day
August
October
Sun.Mon.Tue.Wed.Thu.Fri.Sat.
1
Sunny
26°
2
Light rain
25°
3
Patchy rain possible
28°
4
Moderate rain
26°
5
Sunny
27°
6
Light rain
24°
7
Light rain shower
21°
8
Patchy rain possible
22°
9
Light rain
23°
10
Overcast
23°
11
Partly cloudy
23°
12
Torrential rain shower
25°
13
Overcast
23°
14
Sunny
22°
15
Light rain
24°
16
Mist
23°
17
Patchy rain possible
22°
18
Fog
20°
19
Patchy rain possible
19°
20
Patchy rain possible
22°
21
Moderate rain
23°
22
Light rain
24°
23
Light rain
20°
24
Light rain
20°
25
Partly cloudy
20°
26
Patchy rain possible
20°
27
Overcast
21°
28
Overcast
19°
29
Mist
21°
30
Overcast
22°

Temperatures trend during September in Sarnia

See the weather trend as well as the moving average line

September weather in Sarnia day by day

Click on a date for more information
August October
Date Weather Temperatures Rain UV More
1 Sept. Sunny
Sunny
 26° /14° 0 mm 6
2 Sept. Light rain
Light rain
 25° /14° 3.8 mm 5
3 Sept. Patchy rain possible
Patchy rain possible
 28° /15° 1.8 mm 6
4 Sept. Moderate rain
Moderate rain
 26° /15° 12.6 mm 6
5 Sept. Sunny
Sunny
 27° /15° 0 mm 7
6 Sept. Light rain
Light rain
 24° /14° 3.4 mm 6
7 Sept. Light rain shower
Light rain shower
 21° /12° 2.2 mm 5
8 Sept. Patchy rain possible
Patchy rain possible
 22° /11° 0 mm 4
9 Sept. Light rain
Light rain
 23° /14° 3.3 mm 5
10 Sept. Overcast
Overcast
 23° /14° 0.1 mm 5
11 Sept. Partly cloudy
Partly cloudy
 23° /14° 0.2 mm 6
12 Sept. Torrential rain shower
Torrential rain shower
 25° /14° 6.9 mm 5
13 Sept. Overcast
Overcast
 23° /13° 0.1 mm 5
14 Sept. Sunny
Sunny
 22° /13° 0 mm 6
15 Sept. Light rain
Light rain
 24° /14° 5.7 mm 5
16 Sept. Mist
Mist
 23° /14° 0.8 mm 5
17 Sept. Patchy rain possible
Patchy rain possible
 22° /13° 0.2 mm 4
18 Sept. Fog
Fog
 20° /13° 0.3 mm 5
19 Sept. Patchy rain possible
Patchy rain possible
 19° /13° 1.2 mm 4
20 Sept. Patchy rain possible
Patchy rain possible
 22° /13° 0.1 mm 4
21 Sept. Moderate rain
Moderate rain
 23° /14° 11.3 mm 5
22 Sept. Light rain
Light rain
 24° /14° 8.3 mm 5
23 Sept. Light rain
Light rain
 20° /14° 6.2 mm 4
24 Sept. Light rain
Light rain
 20° /14° 3.9 mm 5
25 Sept. Partly cloudy
Partly cloudy
 20° /14° 0 mm 5
26 Sept. Patchy rain possible
Patchy rain possible
 20° /14° 0.1 mm 4
27 Sept. Overcast
Overcast
 21° /14° 0 mm 5
28 Sept. Overcast
Overcast
 19° /15° 0.7 mm 4
29 Sept. Mist
Mist
 21° /14° 0.1 mm 5
30 Sept. Overcast
Overcast
 22° /14° 0.8 mm 4
Next
Important Notice
Our weather forecast for Sarnia in September is based on the analysis of historical data rather than real-time forecast models. While this provides a general overview, weather conditions can change. We recommend that you check the Sarnia forecast closer to your planned date for the most up-to-date weather information.
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Sarnia in September - FAQ

What are the expected maximum and minimum temperatures in Sarnia during September?
Enjoy moderate daytime temperatures of up to 22° and cooler nights around 14°. Ideal for a range of outdoor activities, from hiking to city tours.

How much rainfall should be expected in Sarnia during September?
Moderate rainfall is anticipated in Sarnia during September, with a total of 74.4 mm spread over approximately 5 days. Considering plans for rainy days is advisable.

What are the typical wind conditions in Sarnia during September?
The average wind speed in Sarnia during September is 20 km/h, suggesting breezy to windy conditions, depending on your activities.

September rainfall patterns in Sarnia

Explore the daily rainfall trends and prepare for Sarnias September weather 💧
Typically, Sarnia has 5 rainy days in September with a total of 74.4 mm of rainfall.

UV exposure in Sarnia during September

Stay informed about UV levels for safe outdoor activities throughout the month of September ☀️
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Get accurate weather forecasts for Sarnia, located at latitude 42.979 and longitude -82.404. Stay updated with localized weather information tailored for Sarnia.

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