Toronto

Ontario Weather in August

Average temperatures, rainfall, sunshine and the best places to visit in Ontario, Canada in August.

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Toronto Ottawa Niagara Falls Mississauga

Planning a getaway to Ontario, Canada this August and curious about the weather you should prepare for? Discover all the vital details you need on this page, solving your puzzle:

What to Expect in Ontario in August

Ontario, Canada is a region in Canada. August in Ontario generally has temperatures that range from pleasant to warm, with precipitation levels ranging from moderate to high. It's the height of summer.

Temperatures

Based on our climate data spanning from 1990-2020, the average maximum temperature is pleasant in Niagara on the Lake at 20°C (68°F) to warm in Amherstburg at 27°C (81°F). Nighttime temperatures generally drop to 20°C (68°F) in Amherstburg and 12°C (54°F) in Niagara on the Lake.

To explore the conditions in Ontario, Canada in more detail, check the map below.

Precipitation

In August, precipitation varies across different areas. From moderate rainfall in Niagara on the Lake with an average of 47 mm (1.9 in) to high rainfall in Otter Lake with 113 mm (4.4 in). Looking at the climate data spanning the last 30 years, this month usually has the lowest rainfall in Toronto, marking it as the year's driest month.

Average sunshine

Most destinations offer generous amounts of sunshine this August. For example, Toronto gets approximately 245 hours of sunlight, perfect for anyone wanting bright, sunny days.

Explore Ontario by month

Pick a month to see the average temperature, rainfall and sunshine in Ontario - and find the best time to visit. (based on Toronto)

January1°C (34°F) February1°C (34°F) March5°C (41°F) April10°C (50°F) May16°C (61°F) June22°C (72°F) This monthJuly26°C (79°F) August26°C (79°F) September22°C (72°F) October16°C (61°F) November9°C (48°F) December4°C (39°F)
Best Time to Visit Ontario →

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
perfect weather
pleasant
tolerable
unpleasant
poor

Perfect weather is subjective. On this map perfect weather has been defined with temperatures between 20°C (68°F) and 29°C (84°F) and not too much precipitation (less than 90 mm (3.5 in) a month).

Popular Destinations in Ontario

What is the weather like in August for some of the most popular destinations in Ontario, Canada?

Temperature range in Ontario (August)

Precipitation variation in Ontario (August)

Toronto

In August Toronto generally has high temperatures with maximum daytime temperatures around 26°C (79°F), minimum nighttime temperatures around 18°C (64°F) and moderate monthly rainfall. So on average the conditions are excellent that month.

« July
August
September »
July
August
September
Max temperature
26°C (79°F)
26°C (79°F)
22°C (72°F)
Min temperature
18°C (64°F)
18°C (64°F)
15°C (59°F)
Monthly sun hours
280 hours
245 hours
195 hours
Monthly rainfall
71 mm (2.8 in)
68 mm (2.7 in)
83 mm (3.3 in)
Monthly rainy days
9 days
10 days
10 days
Weather conditions
excellent
excellent
excellent
Climate in Toronto →

Ottawa

In August Ottawa generally has high temperatures with maximum daytime temperatures around 26°C (79°F), minimum nighttime temperatures around 14°C (57°F) and moderate monthly rainfall. So on average the conditions are excellent that month.

« July
August
September »
July
August
September
Max temperature
27°C (81°F)
26°C (79°F)
22°C (72°F)
Min temperature
15°C (59°F)
14°C (57°F)
10°C (50°F)
Monthly sun hours
280 hours
251 hours
178 hours
Monthly rainfall
102 mm (4 in)
94 mm (3.7 in)
99 mm (3.9 in)
Monthly rainy days
11 days
11 days
12 days
Weather conditions
very good
excellent
excellent
Climate in Ottawa →

Niagara Falls

In August Niagara Falls generally has high temperatures with maximum daytime temperatures around 26°C (79°F), minimum nighttime temperatures around 17°C (63°F) and moderate monthly rainfall. So on average the conditions are excellent that month.

« July
August
September »
July
August
September
Max temperature
27°C (81°F)
26°C (79°F)
23°C (73°F)
Min temperature
17°C (63°F)
17°C (63°F)
13°C (55°F)
Monthly sun hours
307 hours
268 hours
206 hours
Monthly rainfall
90 mm (3.5 in)
67 mm (2.6 in)
86 mm (3.4 in)
Monthly rainy days
12 days
11 days
12 days
Weather conditions
excellent
excellent
excellent
Climate in Niagara Falls →

Mississauga

In August Mississauga generally has high temperatures with maximum daytime temperatures around 26°C (79°F), minimum nighttime temperatures around 17°C (63°F) and moderate monthly rainfall. So on average the conditions are excellent that month.

« July
August
September »
July
August
September
Max temperature
27°C (81°F)
26°C (79°F)
23°C (73°F)
Min temperature
17°C (63°F)
17°C (63°F)
13°C (55°F)
Monthly sun hours
295 hours
276 hours
216 hours
Monthly rainfall
76 mm (3 in)
69 mm (2.7 in)
80 mm (3.1 in)
Monthly rainy days
9 days
9 days
9 days
Weather conditions
excellent
excellent
excellent
Climate in Mississauga →

Niagara on the Lake

In August Niagara on the Lake generally has pleasant temperatures with maximum daytime temperatures around 20°C (68°F), minimum nighttime temperatures around 12°C (54°F) and moderate monthly rainfall. So on average the conditions are excellent that month.

« July
August
September »
July
August
September
Max temperature
20°C (68°F)
20°C (68°F)
17°C (63°F)
Min temperature
12°C (54°F)
12°C (54°F)
9°C (48°F)
Monthly sun hours
307 hours
268 hours
206 hours
Monthly rainfall
53 mm (2.1 in)
47 mm (1.9 in)
60 mm (2.4 in)
Monthly rainy days
9 days
8 days
9 days
Weather conditions
excellent
excellent
good
Climate in Niagara on the Lake →

Is your destination not in the list? Have a look at all destinations in Ontario, in Canada.

Popular cities in August

Day & night temperatures, rainfall and average weather in Ontario in August.

City Weather Day temp Night temp Rainfall
Toronto 26°C (79°F) 18°C (64°F) 68 mm (2.7 in)
Ottawa 26°C (79°F) 14°C (57°F) 94 mm (3.7 in)
Niagara Falls 26°C (79°F) 17°C (63°F) 67 mm (2.6 in)
Mississauga 26°C (79°F) 17°C (63°F) 69 mm (2.7 in)
Niagara on the Lake 20°C (68°F) 12°C (54°F) 47 mm (1.9 in)
Kingston 26°C (79°F) 18°C (64°F) 101 mm (4 in)

Ontario weather in August: frequently asked questions

What is the weather like in Ontario, Canada in August?

Expect excellent weather across Ontario, Canada in August. The popular destination of Toronto averages 26°C (79°F) by day and 18°C (64°F) at night during this summer month.

What is the average temperature in Ontario, Canada in August?

Toronto averages a daytime maximum of 26°C (79°F) in August, with overnight lows close to 18°C (64°F).

Does Ontario, Canada get a lot of rain in August?

August is on the drier side in Ontario, Canada. Toronto averages only about 68 mm (2.7 in), with most days staying dry.

Is August a Good Time to Visit Ontario, Canada?

We believe that August is one of the best times to visit Ontario, Canada with overall excellent weather in Toronto.

On average, the best time to visit Ontario, Canada is in June, July, August and September with generally excellent weather in Toronto. The weather in January, February, March, April, November and December, on the other hand, tends to be less favorable.

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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