Sarnia
August
Weather in Sarnia for August 2025
Your guide to Sarnia weather in August - trends and predictions
The forecast for the first days of August 2025 in Sarnia predicts temperatures to be around 27 °C, close to the historical average.
In general, the average temperature in Sarnia at the beginning of August is 26.6 °C. As the month progressed, temperatures tended to noticeably cool down, reaching an average of 24.4 °C by the end of August.
Sarnia in August brings notable rainfall, with an average of 16 rainy days and a total precipitation of 126.7 mm.
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Temperatures
Rain 🌧️
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15
Dry days
16
Rainy days
0
Snow days
24°/16°
Temperatures
21 km/h
Avg max wind
74 %
Avg humidity
Sarnia Weather August
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Temperatures trend during August in Sarnia
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August weather in Sarnia day by day
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| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| 1 Aug. |  Sunny | 24° /16° | 0 mm | 2.2 | |
| 2 Aug. | Sunny | 26° /14° | 0 mm | 2 | |
| 3 Aug. | Sunny | 27° /16° | 0 mm | 0.1 | |
| 4 Aug. | Sunny | 28° /17° | 0 mm | 6 | |
| 5 Aug. |  Patchy rain possible | 28° /18° | 2.8 mm | 5 | |
| 6 Aug. | Patchy rain possible | 28° /20° | 2.5 mm | 5 | |
| 7 Aug. | Patchy rain possible | 25° /20° | 4.3 mm | 5 | |
| 8 Aug. | Patchy rain possible | 30° /19° | 0.7 mm | 5 | |
| 9 Aug. | Patchy rain possible | 29° /21° | 1.2 mm | 5 | |
| 10 Aug. | Sunny | 31° /20° | 0 mm | 7 | |
| 11 Aug. | Patchy rain possible | 31° /21° | 2.4 mm | 6 | |
| 12 Aug. |  Partly cloudy | 22° /16° | 0.1 mm | 5 | |
| 13 Aug. | Sunny | 18° /10° | 0 mm | 4 | |
| 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.
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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 16°, suitable for diverse activities and preferences.
How much rainfall should be expected in Sarnia during August?
Significant rainfall exceeding 126.7 mm is expected in Sarnia during August, occurring over more than 16 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 21 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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