Montreal Weather in August
Canada · Humid Continental climate · Data averaged from 2020-01-01 to 2024-12-31 (5 years)
August in Montreal sees average temperatures ranging from a low of 17.1°C (62.8°F) to a high of 25.2°C (77.4°F), with a mean of 20.9°C (69.6°F). Compared to the annual average of 8.1°C (46.6°F), this month is 12.8°C warmer than the yearly norm. Precipitation averages 153.6mm, making it approximately 58.0mm wetter than the monthly average of 95.0mm. This is the wettest month of the year, with 153.6mm of precipitation and around 19.6 rainy days. The city receives an average of 10.3 hours of sunshine per day during August, with relative humidity averaging 75.9%. Wind speeds reach an average maximum of 17.1 km/h. For travelers, this month offers a temperature experience in Montreal, with wetter-than-average conditions compared to the rest of the year.
Montreal's climate offers four distinct seasons with dramatic temperature swings. I visited during the summer festival season and found the city alive with outdoor energy. The data shows that the best time to visit is May to September, when temperatures are warm and the city's famous festivals are in full swing. The winters are cold and snowy, but the city's underground city and indoor culture provide warm alternatives.
August vs Adjacent Months
| Metric | July | August | September |
|---|---|---|---|
| Mean Temp | 22.3°C (72.1°F) | 20.9°C (69.6°F) | 16.9°C (62.4°F) |
| Rainfall | 118.1mm | 153.6mm | 79.8mm |
| Sunshine | 11.6 hrs | 10.3 hrs | 9.3 hrs |
| Humidity | 72.8% | 75.9% | 75.5% |
| Wind | 18.0 km/h | 17.1 km/h | 17.4 km/h |
| Rainy Days | 19.4 | 19.6 | 12.0 |
Seasonal Context
August falls in Summer in the Northern Hemisphere. Summer brings the warmest conditions of the year with the longest daylight hours. For travelers visiting Montreal in August, the data indicates mixed conditions based on the combination of temperature, precipitation, and daylight hours.
Frequently Asked Questions
What is the average temperature in Montreal in August?
The average temperature in Montreal during August ranges from 17.1°C (62.8°F) to 25.2°C (77.4°F), with a mean of 20.9°C (69.6°F).
How much does it rain in Montreal in August?
Montreal receives an average of 153.6mm of precipitation in August, spread across approximately 19.6 rainy days. This is the wettest month of the year.
What should I pack for Montreal in August?
Based on August weather data, pack layers including light jackets and t-shirts, plus an umbrella. Rain gear is essential — this month averages 153.6mm of precipitation.
Is August a good time to visit Montreal?
August is a month with challenging conditions. Plan activities carefully and stay hydrated.
Other Months for Montreal
Cities with Similar August Climate (Humid Continental)
Data Source: Open-Meteo historical archive (2020-01-01 to 2024-12-31). Daily measurements aggregated into monthly climate normals. Coordinates: 45.5°, -73.57°. Timezone: America/Montreal. Last updated: 2026-07-30.