Yes

you do need a jacket based on the weather in Montreal, QC, Canada 4 minutes ago

Why? Because it's cold. simple as that!
43°F6°C & Clear

Wind is 6 mph9 km/h from the W, gusting to 11 mph18 km/h
October 17
11am46°F8°C7 mph11 km/h SWClear
12pm49°F9°C7 mph12 km/h SWClear
1pm51°F11°C8 mph13 km/h SWClear
2pm53°F12°C8 mph13 km/h SWClear
3pm54°F12°C8 mph13 km/h SWClear
4pm55°F13°C8 mph13 km/h SWClear
5pm54°F12°C7 mph11 km/h SWClear
6pm51°F11°C6 mph10 km/h SWClear
7pm49°F9°C6 mph9 km/h WClear
8pm47°F9°C5 mph8 km/h WClear
9pm46°F8°C5 mph8 km/h WClear
10pm45°F7°C5 mph8 km/h WClear
DateLowHighWindDayNight
October 1734°F1°C55°F13°C6 mph10 km/h from SWClearClear
October 1837°F3°C59°F15°C3 mph6 km/h from SWClearClear
October 1942°F5°C64°F18°C8 mph13 km/h from SWClearMostly Clear
October 2046°F8°C66°F19°C10 mph16 km/h from SWPartly CloudyMostly Clear
October 2152°F11°C68°F20°C8 mph13 km/h from WMostly ClearMostly Clear
October 2251°F10°C72°F22°C6 mph9 km/h from SWMostly ClearPartly Cloudy
October 2355°F13°C69°F21°C8 mph13 km/h from SThunderstormsRain

Yes

Low of 37°F3°C, High of 59°F15°C
Wind: 3 mph6 km/h
Precipitation: None

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