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Weather in Sarnia for August 2025

Your guide to Sarnia weather in August - trends and predictions
  • In general, the average temperature in Sarnia at the beginning of August is 24.9 °C. As the month progressed, temperatures tended to slightly decrease, reaching an average of 24.4 °C by the end of August.

  • The climate of Sarnia in August is notably wet, with an average of 12 rainy days.

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Average dry days
19
Dry days
Average rainy days
12
Rainy days
Average snowy days
0
Snow days
Average temperatures
24°/15°
Temperatures
Average wind speed
22 km/h
Avg max wind
Average humidity
77 %
Avg humidity

Sarnia in August average weather

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Temperatures trend during August in Sarnia

See the weather trend as well as the moving average line

August weather day by day

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Date Weather Temperatures Rain UV More
1 Aug. Cloudy
Cloudy
26° /17° 1.3 mm 6
2 Aug. Overcast
Overcast
27° /18° 11.1 mm 6
3 Aug. Partly cloudy
Partly cloudy
28° /19° 0.4 mm 7
4 Aug. Overcast
Overcast
26° /18° 0 mm 6
5 Aug. Overcast
Overcast
23° /18° 0.1 mm 5
6 Aug. Heavy rain at times
Heavy rain at times
22° /16° 9.5 mm 5
7 Aug. Heavy rain at times
Heavy rain at times
22° /16° 3.9 mm 5
8 Aug. Overcast
Overcast
25° /15° 0.1 mm 6
9 Aug. Patchy rain possible
Patchy rain possible
25° /16° 0.1 mm 6
10 Aug. Heavy rain at times
Heavy rain at times
22° /14° 2.8 mm 5
11 Aug. Overcast
Overcast
23° /13° 0.6 mm 5
12 Aug. Moderate or heavy rain shower
Moderate or heavy rain shower
25° /16° 4.3 mm 6
13 Aug. Partly cloudy
Partly cloudy
23° /16° 0.9 mm 6
14 Aug. Overcast
Overcast
24° /15° 1.5 mm 6
15 Aug. Moderate or heavy rain shower
Moderate or heavy rain shower
23° /16° 13.2 mm 6
16 Aug. Overcast
Overcast
25° /16° 3.5 mm 6
17 Aug. Moderate or heavy rain shower
Moderate or heavy rain shower
25° /17° 9.5 mm 6
18 Aug. Cloudy
Cloudy
21° /15° 4 mm 5
19 Aug. Cloudy
Cloudy
22° /13° 0.1 mm 5
20 Aug. Cloudy
Cloudy
24° /15° 0.1 mm 5
21 Aug. Overcast
Overcast
22° /14° 0.1 mm 6
22 Aug. Overcast
Overcast
22° /13° 0 mm 6
23 Aug. Moderate or heavy rain shower
Moderate or heavy rain shower
23° /14° 38.6 mm 6
24 Aug. Patchy rain possible
Patchy rain possible
29° /17° 10.4 mm 7
25 Aug. Overcast
Overcast
24° /16° 0 mm 6
26 Aug. Overcast
Overcast
25° /17° 0.1 mm 6
27 Aug. Cloudy
Cloudy
26° /16° 1 mm 6
28 Aug. Partly cloudy
Partly cloudy
23° /15° 3.6 mm 6
29 Aug. Fog
Fog
25° /13° 0.4 mm 6
30 Aug. Patchy rain possible
Patchy rain possible
24° /14° 4.8 mm 6
31 Aug. Sunny
Sunny
24° /15° 0.9 mm 6
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Important Notice
Our weather forecast for Sarnia in August 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.

Sarnia in August - FAQ

What are the expected maximum and minimum temperatures in Sarnia during August?
During August, expect a variety of temperatures with highs around 24° and lows near 15°, suitable for diverse activities and preferences.
How much rainfall should be expected in Sarnia during August?
Significant rainfall exceeding 173.1 mm is expected in Sarnia during August, occurring over more than 12 days. Preparing for wet conditions is recommended in your planning.
What are the typical wind conditions in Sarnia during August?
The average wind speed in Sarnia during August is 22 km/h, suggesting breezy to windy conditions, depending on your activities.

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Location coordinates Where is Sarnia?

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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