Last updated: June 24, 2025
In Ontario, United States, the average temperature in August hovers around 27°C (82°F). Expect a minimum of 11°C (51°F) and a scorching maximum of 44°C (111°F). Precipitation is minimal, with just 5 mm (0.2 in) over 0 days. Additionally, the average humidity is a comfortable 50%. Enjoy the warm weather!
In August in Ontario, the average temperature is 27°C (82°F), with maximums reaching up to 44°C (111°F) and minimums dropping as low as 11°C (51°F). Be prepared for a warm climate but pack a light jacket for cooler evenings.
In Ontario in August, the precipitation amount is 5 mm (0.2 in) during a span of 0 days.
In Ontario in August humidity is 50%. With an average temperature of 27°C (82°F), this humidity feels like a warm embrace, making travel quite pleasant, though you'll want to stay hydrated and take breaks in the shade to fully enjoy the sights.
In Ontario in August, the maximum UV index reaches 10, which corresponds to a very high Exposure Category. With a time to burn of just 15 minutes, it's crucial to take precautions. For more detailed information, you can check the Hourly UV Index in Ontario.
UV Risk Categories
Weather in Ontario varies notably across the year, with each month offering distinct climate conditions. This page compares August’s weather to other months in Ontario, focusing on differences in temperature, rainfall, humidity, and UV levels.
Temperature | Precipitation | Humidity | UV | |
---|---|---|---|---|
January Weather | 0°C (33°F) | 42 mm (1.7 inches) | 88% | moderate |
February Weather | 2°C (36°F) | 46 mm (1.8 inches) | 89% | moderate |
March Weather | 8°C (47°F) | 32 mm (1.3 inches) | 85% | high |
April Weather | 12°C (55°F) | 23 mm (0.9 inches) | 79% | high |
May Weather | 17°C (64°F) | 28 mm (1.1 inches) | 71% | very high |
June Weather | 23°C (73°F) | 16 mm (0.6 inches) | 71% | extreme |
July Weather | 29°C (84°F) | 1 mm (0.0 inches) | 66% | very high |
August Weather | 27°C (82°F) | 5 mm (0.2 inches) | 50% | very high |
September Weather | 21°C (70°F) | 10 mm (0.4 inches) | 48% | very high |
October Weather | 12°C (55°F) | 16 mm (0.6 inches) | 65% | moderate |
November Weather | 6°C (43°F) | 27 mm (1.1 inches) | 84% | moderate |
December Weather | 1°C (35°F) | 29 mm (1.1 inches) | 87% | low |