Sarnia
August
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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19
Dry days
12
Rainy days
0
Snow days
24°/15°
Temperatures
22 km/h
Avg max wind
77 %
Avg humidity
Sarnia in August average weather
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| Mon. | Tue. | Wed. | Thu. | Fri. | Sat. | Sun. |
|---|---|---|---|---|---|---|
| 1  26° | 2  27° | 3  28° | ||||
| 4 26° | 5 23° | 6  22° | 7 22° | 8 25° | 9  25° | 10 22° |
| 11 23° | 12  25° | 13 23° | 14 24° | 15 23° | 16 25° | 17 25° |
| 18 21° | 19 22° | 20 24° | 21 22° | 22 22° | 23 23° | 24 29° |
| 25 24° | 26 25° | 27 26° | 28 23° | 29  25° | 30 24° | 31  24° |
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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 | 26° /17° | 1.3 mm | 6 | |
| 2 Aug. | Overcast | 27° /18° | 11.1 mm | 6 | |
| 3 Aug. | Partly cloudy | 28° /19° | 0.4 mm | 7 | |
| 4 Aug. | Overcast | 26° /18° | 0 mm | 6 | |
| 5 Aug. | Overcast | 23° /18° | 0.1 mm | 5 | |
| 6 Aug. | Heavy rain at times | 22° /16° | 9.5 mm | 5 | |
| 7 Aug. | Heavy rain at times | 22° /16° | 3.9 mm | 5 | |
| 8 Aug. | Overcast | 25° /15° | 0.1 mm | 6 | |
| 9 Aug. | Patchy rain possible | 25° /16° | 0.1 mm | 6 | |
| 10 Aug. | Heavy rain at times | 22° /14° | 2.8 mm | 5 | |
| 11 Aug. | Overcast | 23° /13° | 0.6 mm | 5 | |
| 12 Aug. | Moderate or heavy rain shower | 25° /16° | 4.3 mm | 6 | |
| 13 Aug. | Partly cloudy | 23° /16° | 0.9 mm | 6 | |
| 14 Aug. | Overcast | 24° /15° | 1.5 mm | 6 | |
| 15 Aug. | Moderate or heavy rain shower | 23° /16° | 13.2 mm | 6 | |
| 16 Aug. | Overcast | 25° /16° | 3.5 mm | 6 | |
| 17 Aug. | Moderate or heavy rain shower | 25° /17° | 9.5 mm | 6 | |
| 18 Aug. | Cloudy | 21° /15° | 4 mm | 5 | |
| 19 Aug. | Cloudy | 22° /13° | 0.1 mm | 5 | |
| 20 Aug. | Cloudy | 24° /15° | 0.1 mm | 5 | |
| 21 Aug. | Overcast | 22° /14° | 0.1 mm | 6 | |
| 22 Aug. | Overcast | 22° /13° | 0 mm | 6 | |
| 23 Aug. | Moderate or heavy rain shower | 23° /14° | 38.6 mm | 6 | |
| 24 Aug. | Patchy rain possible | 29° /17° | 10.4 mm | 7 | |
| 25 Aug. | Overcast | 24° /16° | 0 mm | 6 | |
| 26 Aug. | Overcast | 25° /17° | 0.1 mm | 6 | |
| 27 Aug. | Cloudy | 26° /16° | 1 mm | 6 | |
| 28 Aug. | Partly cloudy | 23° /15° | 3.6 mm | 6 | |
| 29 Aug. | Fog | 25° /13° | 0.4 mm | 6 | |
| 30 Aug. | Patchy rain possible | 24° /14° | 4.8 mm | 6 | |
| 31 Aug. | 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.
August rainfall patterns in Sarnia
Explore the daily rainfall trends and prepare for Sarnias August weather 💧
UV exposure in Sarnia during August
Stay informed about UV levels for safe outdoor activities throughout the month of August ☀️
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