Montréal in August

When to go

August is still full summer in Montréal. Environment and Climate Change Canada's most recent normals for the Montréal-Trudeau station list the month's typical highs and lows, its rain days and the days when the humidex runs high, so check the forecast close to your dates. Tourisme Montréal lists Osheaga at Parc Jean-Drapeau into the first day of August and its annual fireworks competition from July to August, and its festival guide says hundreds of events run from May to September.

Trip facts

• Environment and Climate Change Canada's 1991–2020 Canadian Climate Normals for the Montreal Trudeau (Airport) station list, for August, a daily maximum of 25.7 °C, a daily minimum of 15.6 °C, 93.6 mm of precipitation, 11.2 days with at least 0.2 mm of precipitation and 15.3 days with a humidex of 30 or more. (climate.weather.gc.ca, checked 2026-10-16)
• Tourisme Montréal's listing shows OSHEAGA, Music and Arts Festival from July 30 to August 1, 2027 at Parc Jean-Drapeau, Île Sainte-Hélène, with numerous outdoor stages and over 100 bands over the course of three days. (www.mtl.org, checked 2026-10-16)
• Tourisme Montréal's listing shows L'International des Feux Loto-Québec annually from July to August, an international fireworks competition launched from inside the La Ronde amusement park on Île Sainte-Hélène that explodes over the St. Lawrence River beside the Jacques-Cartier Bridge. (www.mtl.org, checked 2026-10-16)
• Tourisme Montréal's summer festival guide says that, year after year, Montréal's summer festivals make up one of the most packed events calendars in the world, with hundreds of events from May to September. (www.mtl.org, checked 2026-10-16)
• The Canada Border Services Agency says that, to prove identity and citizenship, regardless of age, it recommends US citizens travel with a valid passport, that they may also present documents showing their full name, date of birth and citizenship, and that documents required by the airlines may be different than what the CBSA requires upon entry. (www.cbsa-asfc.gc.ca, checked 2026-10-16)
• The Canada Border Services Agency says you can make your customs and immigration declaration with Advance Declaration in the ArriveCAN app up to 72 hours before a flight into a participating airport, and lists Montréal-Trudeau International Airport (YUL) among them. (www.canada.ca, checked 2026-10-16)
• Montréal-Trudeau's help centre says YUL provides border preclearance for passengers bound for the United States, so they will not have to submit to any other formalities when arriving in the United States, and that they must have all the required documentation to enter the United States, including a valid passport. (yulsatisfaction.admtl.com, checked 2026-10-16)
• Montréal-Trudeau's help centre says the 747 bus line runs between YUL and downtown Montréal 24 hours a day, 7 days a week, on a short route between Lionel-Groulx metro station and YUL (approximately 30 to 35 minutes) and a long route between the Gare d'autocars de Montréal (Berri-UQAM station) and YUL with 11 stops (approximately 45 to 70 minutes). (yulsatisfaction.admtl.com, checked 2026-10-16)
• Montréal-Trudeau's help centre says the fare for the 747 line is $11.25 and includes unlimited travel for 24 hours on the entire STM bus and métro network. (yulsatisfaction.admtl.com, checked 2026-10-16)
• Tourisme Montréal says the STM is composed of a four-line Métro system linked with 220 daytime bus lines and 23 night routes, and that children aged 11 and under can travel for free at all times when accompanied by someone 14 or older who holds a valid transit fare, an offer that also applies to the 747 YUL Airport / Downtown bus line. (www.mtl.org, checked 2026-10-16)