Yes

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

Why? Because it's bitterly cold.
48°F9°C & Clear

Wind is 7 mph11 km/h from the W, gusting to 16 mph25 km/h
April 25
7pm48°F9°C6 mph10 km/h WMostly Clear
8pm45°F7°C6 mph9 km/h WClear
9pm43°F6°C5 mph9 km/h WClear
10pm42°F5°C5 mph9 km/h WClear
11pm40°F4°C5 mph8 km/h WClear
April 26
12am39°F4°C5 mph8 km/h WClear
1am37°F3°C5 mph8 km/h NWClear
2am36°F2°C4 mph6 km/h NClear
3am35°F2°C3 mph6 km/h NClear
4am34°F1°C3 mph5 km/h NClear
5am33°F1°C3 mph4 km/h NEClear
6am32°F0°C2 mph4 km/h NEClear
DateLowHighWindDayNight
April 2526°F-4°C49°F9°C5 mph8 km/h from WMostly ClearClear
April 2632°F0°C56°F14°C3 mph5 km/h from SClearClear
April 2738°F3°C64°F18°C10 mph16 km/h from SEMostly CloudyDrizzle
April 2848°F9°C68°F20°C8 mph12 km/h from SDrizzleRain
April 2949°F9°C66°F19°C9 mph14 km/h from NEMostly CloudyRain
April 3052°F11°C68°F20°C7 mph11 km/h from ERainRain
May 148°F9°C65°F18°C5 mph7 km/h from NERainRain

Yes

Low of 32°F0°C, High of 56°F14°C
Wind: 3 mph5 km/h
Precipitation: None

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