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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.

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Average dry days
27
Dry days
Average rainy days
4
Rainy days
Average snowy days
0
Snow days
Average temperatures
33°/19°
Temperatures
Average wind speed
16 km/h
Avg max wind
Average humidity
42 %
Avg humidity

Ontario in August average weather

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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
Overcast
34° /21° 0 mm 7
Aug. 2 Partly cloudy
Partly cloudy
35° /20° 0 mm 9
Aug. 3 Sunny
Sunny
35° /20° 0 mm 9
Aug. 4 Sunny
Sunny
36° /19° 0 mm 9
Aug. 5 Sunny
Sunny
38° /20° 0 mm 9
Aug. 6 Sunny
Sunny
37° /22° 0 mm 9
Aug. 7 Sunny
Sunny
34° /19° 0 mm 9
Aug. 8 Sunny
Sunny
33° /17° 0 mm 8
Aug. 9 Heavy rain at times
Heavy rain at times
32° /20° 1.8 mm 8
Aug. 10 Patchy rain possible
Patchy rain possible
32° /19° 0.2 mm 8
Aug. 11 Partly cloudy
Partly cloudy
31° /18° 0 mm 8
Aug. 12 Sunny
Sunny
32° /18° 0 mm 8
Aug. 13 Sunny
Sunny
33° /17° 0 mm 8
Aug. 14 Sunny
Sunny
34° /19° 0 mm 9
Aug. 15 Sunny
Sunny
36° /19° 0 mm 9
Aug. 16 Patchy rain possible
Patchy rain possible
36° /20° 0.1 mm 8
Aug. 17 Sunny
Sunny
36° /20° 0 mm 9
Aug. 18 Sunny
Sunny
35° /17° 0 mm 9
Aug. 19 Patchy rain possible
Patchy rain possible
33° /19° 0.1 mm 8
Aug. 20 Moderate or heavy rain shower
Moderate or heavy rain shower
31° /19° 37.8 mm 8
Aug. 21 Moderate rain at times
Moderate rain at times
31° /17° 13.8 mm 7
Aug. 22 Cloudy
Cloudy
30° /15° 0 mm 7
Aug. 23 Sunny
Sunny
30° /15° 0 mm 8
Aug. 24 Partly cloudy
Partly cloudy
29° /15° 0 mm 8
Aug. 25 Partly cloudy
Partly cloudy
32° /15° 0 mm 8
Aug. 26 Sunny
Sunny
34° /18° 0 mm 8
Aug. 27 Sunny
Sunny
35° /19° 0 mm 9
Aug. 28 Sunny
Sunny
35° /20° 0 mm 9
Aug. 29 Sunny
Sunny
35° /20° 0 mm 9
Aug. 30 Sunny
Sunny
35° /20° 0 mm 9
Aug. 31 Sunny
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.

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 ☀️

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Location coordinates Where is Ontario?

Get accurate weather forecasts for Ontario, located at latitude 34.063 and longitude -117.651. Stay updated with localized weather information tailored for Ontario.

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