Yes

you do need a jacket based on the weather in Montreal, QC, Canada 1 minute ago

Why? Because the wind could blow a wig clean off your head!
61°F16°C & Cloudy

Wind is 11 mph17 km/h from the West, gusting to 23 mph37 km/h
August 26
9am62°F17°C11 mph18 km/h WestMostly Clear
10am63°F17°C11 mph18 km/h WestPartly Cloudy
11am65°F18°C12 mph19 km/h WestPartly Cloudy
12pm66°F19°C12 mph20 km/h WestMostly Cloudy
1pm68°F20°C13 mph20 km/h WestMostly Cloudy
2pm68°F20°C12 mph20 km/h WestMostly Cloudy
3pm68°F20°C12 mph19 km/h WestMostly Cloudy
4pm69°F21°C12 mph19 km/h WestMostly Cloudy
5pm69°F20°C11 mph18 km/h WestPartly Cloudy
6pm68°F20°C10 mph17 km/h WestPartly Cloudy
7pm66°F19°C9 mph14 km/h WestPartly Cloudy
8pm65°F18°C7 mph12 km/h WestPartly Cloudy
DateLowHighWindDayNight
August 2658°F15°C69°F21°C11 mph18 km/h from WestPartly CloudyMostly Clear
August 2755°F13°C70°F21°C7 mph12 km/h from WestPartly CloudyPartly Cloudy
August 2855°F13°C73°F23°C8 mph12 km/h from SouthMostly CloudyRain
August 2957°F14°C67°F20°C7 mph11 km/h from SouthwestRainDrizzle
August 3054°F12°C66°F19°C6 mph10 km/h from WestDrizzlePartly Cloudy
August 3156°F13°C72°F22°C5 mph8 km/h from NorthPartly CloudyMostly Clear
September 157°F14°C75°F24°C3 mph5 km/h from NorthwestMostly ClearMostly Clear

Yes

Low of 55°F13°C, High of 70°F21°C
Wind: 7 mph12 km/h
Precipitation: None

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