Yes

you do need a jacket based on the weather in Montreal, QC, Canada 7 minutes ago

Why? Because it's cool. Pleasantly cool, but cool!
58°F14°C & Clear

Wind is 6 mph9 km/h from the North, gusting to 11 mph18 km/h
August 6
5am58°F14°C6 mph9 km/h NorthClear
6am57°F14°C6 mph9 km/h NorthClear
7am58°F15°C6 mph10 km/h NortheastClear
8am61°F16°C6 mph10 km/h NortheastClear
9am65°F18°C7 mph12 km/h NortheastClear
10am69°F20°C7 mph11 km/h NortheastClear
11am74°F23°C6 mph10 km/h NortheastClear
12pm77°F25°C6 mph10 km/h NortheastClear
1pm80°F26°C6 mph10 km/h NortheastClear
2pm81°F27°C6 mph10 km/h NortheastClear
3pm82°F28°C6 mph10 km/h NortheastClear
4pm82°F28°C6 mph10 km/h NortheastClear
DateLowHighWindDayNight
August 657°F14°C82°F28°C6 mph10 km/h from NortheastClearMostly Clear
August 762°F17°C83°F28°C3 mph5 km/h from SoutheastPartly CloudyMostly Clear
August 866°F19°C84°F29°C5 mph8 km/h from SouthPartly CloudyPartly Cloudy
August 968°F20°C86°F30°C7 mph11 km/h from SouthwestMostly ClearMostly Clear
August 1070°F21°C89°F32°C7 mph11 km/h from SouthwestMostly ClearClear
August 1172°F22°C90°F32°C7 mph11 km/h from SouthwestMostly ClearPartly Cloudy
August 1274°F23°C87°F30°C9 mph14 km/h from SouthwestPartly CloudyRain

No

Low of 62°F17°C, High of 83°F29°C
Wind: 3 mph5 km/h
Precipitation: 6% rain

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