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 26.1 °C. As the month progressed, temperatures tended to moderately fall, reaching an average of 24.9 °C by the end of August.
Expect significant rainfall in Ontario during August, with an average of 16 rainy days.
- New! Chat with our AI weatherman - it’s amazing and free.
15
Dry days
16
Rainy days
0
Snow days
24°/15°
Temperatures
16 km/h
Avg max wind
68 %
Avg humidity
Ontario in August average weather
Move between months or click on a day
| Mon. | Tue. | Wed. | Thu. | Fri. | Sat. | Sun. |
|---|---|---|---|---|---|---|
| 1  27° | 2  27° | 3  27° | ||||
| 4 28° | 5  25° | 6 25° | 7 24° | 8 23° | 9 25° | 10 22° |
| 11 22° | 12 25° | 13 26° | 14 26° | 15 26° | 16 26° | 17 25° |
| 18 21° | 19  23° | 20 24° | 21 23° | 22 24° | 23  24° | 24 25° |
| 25  27° | 26 26° | 27 27° | 28  23° | 29 24° | 30 23° | 31 24° |
You can click on date
Access Ontario weather forecasts with a simple click. Select any date for comprehensive insights on temperature, rainfall, and wind conditions.
Temperatures trend during August in Ontario
See the weather trend as well as the moving average line
August weather day by day
Click on a date for more information
| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| 1 Aug. | Patchy rain possible | 27° /18° | 0.7 mm | 6 | |
| 2 Aug. | Overcast | 27° /18° | 0.1 mm | 7 | |
| 3 Aug. | Moderate rain at times | 27° /18° | 3.3 mm | 6 | |
| 4 Aug. | Patchy rain possible | 28° /19° | 0.1 mm | 7 | |
| 5 Aug. | Cloudy | 25° /17° | 1.6 mm | 6 | |
| 6 Aug. | Overcast | 25° /16° | 1.2 mm | 6 | |
| 7 Aug. | Moderate or heavy rain shower | 24° /16° | 5.4 mm | 6 | |
| 8 Aug. | Overcast | 23° /17° | 0.2 mm | 5 | |
| 9 Aug. | Cloudy | 25° /16° | 5.3 mm | 6 | |
| 10 Aug. | Moderate or heavy rain shower | 22° /16° | 7.2 mm | 5 | |
| 11 Aug. | Cloudy | 22° /14° | 1.2 mm | 5 | |
| 12 Aug. | Moderate or heavy rain shower | 25° /16° | 5 mm | 6 | |
| 13 Aug. | Patchy rain possible | 26° /15° | 0.2 mm | 6 | |
| 14 Aug. | Overcast | 26° /16° | 0 mm | 6 | |
| 15 Aug. | Moderate rain at times | 26° /17° | 4.9 mm | 6 | |
| 16 Aug. | Cloudy | 26° /17° | 0.5 mm | 6 | |
| 17 Aug. | Patchy rain possible | 25° /18° | 7.7 mm | 6 | |
| 18 Aug. | Patchy rain possible | 21° /16° | 7.9 mm | 5 | |
| 19 Aug. | Partly cloudy | 23° /13° | 0.9 mm | 6 | |
| 20 Aug. | Moderate or heavy rain shower | 24° /13° | 1.4 mm | 6 | |
| 21 Aug. | Overcast | 23° /14° | 0 mm | 6 | |
| 22 Aug. | Overcast | 24° /14° | 0 mm | 6 | |
| 23 Aug. | Heavy rain at times | 24° /15° | 3.4 mm | 6 | |
| 24 Aug. | Patchy rain possible | 25° /16° | 1 mm | 6 | |
| 25 Aug. | Mist | 27° /17° | 0.9 mm | 7 | |
| 26 Aug. | Cloudy | 26° /16° | 0 mm | 6 | |
| 27 Aug. | Partly cloudy | 27° /16° | 0 mm | 7 | |
| 28 Aug. | Sunny | 23° /15° | 2 mm | 6 | |
| 29 Aug. | Mist | 24° /14° | 0.3 mm | 6 | |
| 30 Aug. | Light rain shower | 23° /14° | 1.6 mm | 6 | |
| 31 Aug. | Sunny | 24° /14° | 5 mm | 6 | |
| Next | |||||
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?
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 Ontario during August?
Moderate rainfall is anticipated in Ontario during August, with a total of 77.8 mm spread over approximately 16 days. Considering plans for rainy days is advisable.
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.
August rainfall patterns in Ontario
Explore the daily rainfall trends and prepare for Ontarios August weather 💧
UV exposure in Ontario during August
Stay informed about UV levels for safe outdoor activities throughout the month of August ☀️
Provinces in Ontario
Select a province for an accurate weather forecast
Top locations in Ontario
Select a location for an accurate weather forecast
More Locations Quick links
You are here
Where is Ontario?Get accurate weather forecasts for Ontario, located at latitude 43.706 and longitude -79.399. Stay updated with localized weather information tailored for Ontario.
Found a mistake?
We appreciate your attention to details. Tell us here.