Yes

you do need a jacket based on the weather in Montreal, QC H2P 2L1, Canada 1 second ago

Why? Because it's cold. simple as that.
41°F5°C & Clear

Wind is 2 mph3 km/h from the E, gusting to 7 mph11 km/h
April 26
10am43°F6°C2 mph4 km/h SEClear
11am47°F8°C2 mph4 km/h SClear
12pm50°F10°C2 mph4 km/h SClear
1pm52°F11°C2 mph4 km/h SWClear
2pm54°F12°C2 mph4 km/h SClear
3pm55°F13°C3 mph5 km/h SClear
4pm56°F14°C4 mph6 km/h SClear
5pm57°F14°C4 mph7 km/h SClear
6pm56°F13°C4 mph7 km/h SClear
7pm54°F12°C4 mph6 km/h SClear
8pm51°F11°C4 mph6 km/h SEClear
9pm49°F9°C4 mph7 km/h SEClear
DateLowHighWindDayNight
April 2630°F-1°C57°F14°C3 mph5 km/h from SClearClear
April 2738°F3°C65°F18°C9 mph14 km/h from SEMostly CloudyDrizzle
April 2848°F9°C67°F20°C7 mph11 km/h from SCloudyMostly Cloudy
April 2944°F7°C60°F16°C8 mph13 km/h from NEMostly CloudyRain
April 3045°F7°C56°F13°C11 mph19 km/h from NERainDrizzle
May 142°F5°C62°F17°C5 mph9 km/h from NEMostly CloudyDrizzle
May 250°F10°C65°F18°C6 mph9 km/h from WDrizzleDrizzle

Yes

Low of 37°F3°C, High of 65°F19°C
Wind: 9 mph14 km/h
Precipitation: None

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