August · Canada
Best time to visit Montreal in August Weather, crowds & prices
Weather in Montreal in August
Average temperature 21°C, 123 mm of rain, about 18 days with 6+ hours of sunshine and 74% humidity — based on the five most recent complete years of ERA5 data (2021–2025).
August score
7.5/10
Ranked #5 of 12 months
- Avg temp
- 21°C
- Rainfall
- 123 mm
- Humidity
- 74%
- Days with 6h+ sun
- 18
- Crowd Density
- Peak Tourist Rush
- Average Expenses
- $$$ · Peak Season Rates ($$$)
August in Montreal scores 7.5/10 for sightseeing and cultural travel - an above-average month (#5 of 12). Expect around 21°C, 123 mm of rain, and roughly 18 days with 6+ hours of sunshine this month.
Montréal sets Old Montréal's stone streets below Mount Royal, with Plateau cafés and bagels nearby.
August in Montreal: strong conditions, 5th of 12
August averages 21°C (70°F) — pleasant for mornings and evenings on foot in the city, with a midday break when the sun is strongest.
At 123 mm this is a genuinely wet month: about 18 days with 6+ hours of sunshine in total, and outdoor plans need an indoor fallback.
It scores 7.5/10 here, 5th of 12 months, against 8.7/10 in the destination's best month.
Pack light clothing, a hat and real sun protection, a proper rain shell rather than an umbrella.
Figure on peak pricing, with this is one of the busiest months here.
Frequently asked
- What is the weather like in Montreal in August?
- In August, Montreal averages 21°C, 123 mm of rain, and about 18 days with 6+ hours of sunshine. Its climate-comfort score is 7.5/10.
- Is August a good time to visit Montreal?
- August earns a 7.5/10 climate-comfort score. Use the year-round chart to weigh the weather against your budget and crowd preferences.
- How much does it rain in Montreal in August?
- Expect about 123 mm of rain in August. Average humidity is 74% and there are about 18 days with 6+ hours of sunshine.
Curated in Montreal
Tickets & experiences
Things to do in Montreal
Montreal, Canada. Live activities and tours from GetYourGuide, matched to this destination.