Ontario Weather in August

August in Ontario brings very high temperatures, with highs of 34°C (93°F) and nights dropping to 18°C (64°F). Rainfall is very low this month, averaging just 0.9 mm (0.04 in).

Rainfall in Ontario in August

This month experiences about 0 days of rain according to historical data, averaging 0.9 mm (0.04 in). Any rain that does arrive is likely to be light drizzle rather than a proper shower.

Temperature in Ontario in August

In August, Ontario sees very high temperatures, with highs of 34°C (93°F). Nights drop to around 18°C (64°F). Mornings and evenings are often more comfortable than the peak afternoon hours. With overnight lows of 18°C (64°F), evenings can feel noticeably cooler than the daytime. An extra layer is a good idea, though the cool air makes for a good night's sleep. Keep in mind, these temperatures are averages, and some days might be even warmer. Dress suitably to manage the heat.

Sunshine in Ontario in August

There are approximately 351 hours of sunshine this month, resulting in mostly clear days.

If you prefer dry days with pleasant temperatures, August may not be the ideal month to visit Ontario. Our weather planner can help you explore destinations with more pleasant weather conditions.