Ontario
August
Weather in Ontario for August 2025
Your guide to Ontario weather in August - trends and predictions
In general, the average temperature in Ontario at the beginning of August is 35.6 °F. As the month progressed, temperatures tended to moderately fall, reaching an average of 34.3 °F by the end of August.
With an average of 4 rainy days, Ontario experiences minimal rainfall in August, ensuring that most days remain pleasantly dry.
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27
Dry days
4
Rainy days
0
Snow days
33°/19°
Temperatures
16 km/h
Avg max wind
42 %
Avg humidity
Ontario in August average weather
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| Mon. | Tue. | Wed. | Thu. | Fri. | Sat. | Sun. |
|---|---|---|---|---|---|---|
| 1  34° | 2  35° | 3  35° | ||||
| 4 36° | 5 38° | 6 37° | 7 34° | 8 33° | 9  32° | 10  32° |
| 11 31° | 12 32° | 13 33° | 14 34° | 15 36° | 16 36° | 17 36° |
| 18 35° | 19 33° | 20  31° | 21 31° | 22  30° | 23 30° | 24 29° |
| 25 32° | 26 34° | 27 35° | 28 35° | 29 35° | 30 35° | 31 34° |
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Temperatures trend during August in Ontario
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 |
|---|---|---|---|---|---|
| Aug. 1 | Overcast | 34° /21° | 0 mm | 7 | |
| Aug. 2 | Partly cloudy | 35° /20° | 0 mm | 9 | |
| Aug. 3 | Sunny | 35° /20° | 0 mm | 9 | |
| Aug. 4 | Sunny | 36° /19° | 0 mm | 9 | |
| Aug. 5 | Sunny | 38° /20° | 0 mm | 9 | |
| Aug. 6 | Sunny | 37° /22° | 0 mm | 9 | |
| Aug. 7 | Sunny | 34° /19° | 0 mm | 9 | |
| Aug. 8 | Sunny | 33° /17° | 0 mm | 8 | |
| Aug. 9 | Heavy rain at times | 32° /20° | 1.8 mm | 8 | |
| Aug. 10 | Patchy rain possible | 32° /19° | 0.2 mm | 8 | |
| Aug. 11 | Partly cloudy | 31° /18° | 0 mm | 8 | |
| Aug. 12 | Sunny | 32° /18° | 0 mm | 8 | |
| Aug. 13 | Sunny | 33° /17° | 0 mm | 8 | |
| Aug. 14 | Sunny | 34° /19° | 0 mm | 9 | |
| Aug. 15 | Sunny | 36° /19° | 0 mm | 9 | |
| Aug. 16 | Patchy rain possible | 36° /20° | 0.1 mm | 8 | |
| Aug. 17 | Sunny | 36° /20° | 0 mm | 9 | |
| Aug. 18 | Sunny | 35° /17° | 0 mm | 9 | |
| Aug. 19 | Patchy rain possible | 33° /19° | 0.1 mm | 8 | |
| Aug. 20 | Moderate or heavy rain shower | 31° /19° | 37.8 mm | 8 | |
| Aug. 21 | Moderate rain at times | 31° /17° | 13.8 mm | 7 | |
| Aug. 22 | Cloudy | 30° /15° | 0 mm | 7 | |
| Aug. 23 | Sunny | 30° /15° | 0 mm | 8 | |
| Aug. 24 | Partly cloudy | 29° /15° | 0 mm | 8 | |
| Aug. 25 | Partly cloudy | 32° /15° | 0 mm | 8 | |
| Aug. 26 | Sunny | 34° /18° | 0 mm | 8 | |
| Aug. 27 | Sunny | 35° /19° | 0 mm | 9 | |
| Aug. 28 | Sunny | 35° /20° | 0 mm | 9 | |
| Aug. 29 | Sunny | 35° /20° | 0 mm | 9 | |
| Aug. 30 | Sunny | 35° /20° | 0 mm | 9 | |
| Aug. 31 | Sunny | 34° /20° | 0 mm | 8 | |
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Important Notice
Our weather forecast for Ontario 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 Ontario forecast closer to your planned date for the most up-to-date weather information.
Ontario in August - FAQ
What are the expected maximum and minimum temperatures in Ontario during August?
Expect warm days with temperatures around 33°, cooling to mild conditions of 19° after sunset. Perfect for those who enjoy warm weather.
How much rainfall should be expected in Ontario during August?
Significant rainfall exceeding 107.2 mm is expected in Ontario during August, occurring over more than 4 days. Preparing for wet conditions is recommended in your planning.
What are the typical wind conditions in Ontario during August?
The average wind speed in Ontario during August is 16 km/h, suggesting breezy to windy conditions, depending on your activities.
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