Temperature in Ontario in August

Daytime highs, nighttime lows and the warmest cities in Ontario, Canada this August.

Ontario, Canada, a region in Canada, experiences maximum daytime temperatures in August ranging from 20°C (68°F) in Niagara on the Lake to 27°C (81°F) in Amherstburg. Nighttime temperatures generally drop to 20°C (68°F) in Amherstburg and 12°C (54°F) in Niagara on the Lake. In August, it is summer.

What is the temperature of the different cities in Ontario, Canada in August?

Explore the map below to discover average August temperatures at the top destinations in Ontario. For a deeper dive, simply click on any destination dot.

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

See also: Ontario weather by month.

Best Places to Visit in Ontario in August

Click on a destination dot for more details. Toggle the map to compare temperatures or precipitation across Ontario.

Conditions Temperatures Precipitation
Avg daytime high -5°C (23°F) cold → 32°C (90°F) hot

Marker color shows the average daytime high temperature in August: blue is cold, red is hot.

See all August weather averages, cities and regions in Ontario

Ontario temperatures in August: frequently asked questions

How hot does it get in Ontario, Canada in August?

Toronto averages a daytime high of 26°C (79°F) in August, which is high for Ontario, Canada.

How cold does it get at night in Ontario, Canada in August?

Nighttime temperatures in Toronto typically drop to around 18°C (64°F) in August.

What is the warmest city in August in Ontario, Canada?

Data insights from our comprehensive database indicate that Amherstburg is the city with the highest warmth. Daytime peaks average near 27°C (81°F), while the nights are characterized by a low temperature close to 20°C (68°F).

What is the coldest city in August in Ontario, Canada?

Our database indicates that in August, Niagara on the Lake is the city with the coolest temperatures in Ontario, Canada. You can expect daytime highs of 20°C (68°F) and nighttime lows close to 12°C (54°F).

How much sun does Ontario, Canada get in August?

Toronto usually sees around 245 hours of sunlight, indicating many sunny days.

Interested in more climate information?

We have much more information about the climate in Ontario.

Weather and climate has detailed information for every country in the world. Are you going to Canada? Get detailed historical weather averages for many cities in Canada.

Not sure yet where to go? We now have a tool which recommends destinations that suit your ideal travel conditions. Find out where to go with our weather planner.

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