Montréal Weather in August

August in Montréal typically sees daytime highs of 27°C (81°F) and nighttime lows of 15°C (59°F). Rainfall is also possible this month, so it's worth packing an umbrella. It falls within the summer season.

Rainfall in Montréal in August

You can expect rain on around 13 days based on historical patterns, with 104 mm (4.1 in) average for the month. Individual showers can be quite heavy this month. A proper umbrella or rain jacket is worth having.

Temperature in Montréal in August

August in Montréal sees highs of 27°C (81°F) and lows of 15°C (59°F) overnight. August marks the summer season. The days can feel warmer than the evenings, so packing for both parts of the day is a good idea. At 15°C (59°F) overnight, it can feel quite a bit cooler after dark. Worth packing something warmer for evenings, but the cooler temperatures are ideal for sleeping.

Sunshine in Montréal in August

Enjoy a sunny month with about 245 hours of sunshine, the clear skies make Montréal even more beautiful.

Wind Speed in Montréal in August

August has wind speeds averaging 5 m/s (10 knots). You can expect gentle to moderate winds that move small trees and make flags wave steadily on typical days. Conditions typically range from light breezes to moderate winds.

Average water temperature in August

With water at 21°C (70°F), conditions are good for swimming and other water activities. You won't need a wetsuit and most people find it very comfortable.

So this is a great month to visit if you prefer dry days with pleasant temperatures.

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

Montréal Temperature in August

Min Temperature 15°C (59°F)  

Max Temperature 27°C (81°F)  

Water Temperature 21°C (70°F)  

Chance of Rain 42%  

Precipitation 104 mm (4.1 in)  

Rainy days 13 days  

Humidity 57%  

Windspeed 5 m/s (10 knots)  

Sunshine 245 hours  

Percentage Sunshine 56%  

Daily Historical Temperatures

50-year average (1976-2025)

Based on our historical records, temperatures in Montréal typically stay consistent throughout August, with daily highs averaging around 27°C (81°F). Nights are pleasant, with lows typically ranging from 14°C (57°F) to 18°C (64°F).

Average temperatures in August

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Daily Historical Precipitation

50-year average (1976-2025)

Average daily rainfall for each day of the month based on long-term records.

Average precipitation in August

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Historical weather for Montréal in August

Browse day-by-day weather records for Montréal spanning 51 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.

Historical weather Temperatures Precipitation

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Montréal historical weather extremes in August

Based on 49 years of weather observations (1976-2025), these are the most extreme conditions recorded in Montréal.

• On August 14, 2002, temperatures climbed to 35°C (95°F), marking the warmest August day on record.
• The lowest daytime temperature in August was 13°C (55°F), recorded on August 31, 1994.
• The lowest overnight temperature recorded in August was 3°C (37°F) (August 31, 1976).

What to Wear in Montréal in August

Warm but pleasant conditions in Montréal in August. Focus on lightweight, maybe with natural fabrics, cotton blend shirts, comfortable shorts, and breathable footwear. A light cover-up for sun protection is smart too. Expect heavy rainfall, so bring good rain protection and waterproof bags. The water temperature sits at about 21°C (70°F), making it perfect for swimming and water activities. Don't forget to pack your favorite swimwear and perhaps some snorkel gear. And with plenty of sunshine hours, don’t forget sunglasses, sunscreen, and maybe a sun hat.

What To Do in Montréal in August

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

Swimming

9/10

Cycling

7/10

Walking

7/10

Camping

6/10

Outdoor sports

7/10

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 Canada, check out our Montréal's climate page.

More climate data for Montréal

Temperature Rainfall Sunshine Humidity Wind Speed Water Temp

See the full Montréal climate overview or explore weather in Canada.