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.

Select a Month

Check the conditions for any month of the year.

• January
• February
• March
• April

• May
• June
• July
• August

• September
• October
• November
• December

For a detailed overview over the year and the best time to visit the United States of America, check out our Ontario's climate page.

Ontario Temperature in August

Min Temperature 18°C (64°F)  

Max Temperature 34°C (93°F)  

Chance of Rain 1%  

Precipitation 0.9 mm (0.04 in)  

Rainy days 0 days  

Sunshine 351 hours *  

Percentage Sunshine *  

* Data from: Corona, the United States of America (22 KM, 13 Miles).

What to Wear in Ontario in August

Get ready for hot weather in August! Lightweight, breathable fabrics are your best friend during this month. Cotton and linen shirts, shorts, sundresses, and sandals will keep you comfortable. Light colors help reflect the heat, avoid wearing black. You'll definitely want to pack sunglasses and sunscreen. There will be plenty of bright sunshine this month.

What To Do in Ontario in August

We rated the following activities from 1 (least suitable) to 10 (best) to do.

Swimming

10/10

Cycling

8/10

Walking

8/10

Barbeque

10/10

Camping

10/10

Outdoor sports

8/10

Select a Month

Check the conditions for any month of the year.

• January
• February
• March
• April

• May
• June
• July
• August

• September
• October
• November
• December

For a detailed overview over the year and the best time to visit the United States of America, check out our Ontario's climate page.

More climate data for Ontario

Temperature Rainfall Sunshine

See the full Ontario climate overview or explore weather in the United States of America.