Yes

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

Why? Because just cool enough for a jacket, but not warm enough to ditch it!
51°F10°C & Cloudy

Wind is 4 mph6 km/h from the North, gusting to 6 mph10 km/h
May 3
10am52°F11°C3 mph5 km/h NorthCloudy
11am53°F11°C3 mph5 km/h NorthwestCloudy
12pm53°F12°C3 mph4 km/h WestCloudy
1pm54°F12°C4 mph7 km/h SouthwestCloudy
2pm55°F13°C4 mph7 km/h WestCloudy
3pm56°F13°C5 mph8 km/h SouthwestCloudy
4pm57°F14°C3 mph5 km/h SouthwestMostly Cloudy
5pm57°F14°C3 mph5 km/h SouthwestMostly Cloudy
6pm57°F14°C3 mph5 km/h SouthMostly Cloudy
7pm56°F14°C3 mph5 km/h SouthMostly Cloudy
8pm54°F12°C3 mph5 km/h SouthPartly Cloudy
9pm52°F11°C3 mph6 km/h SouthMostly Cloudy
DateLowHighWindDayNight
May 347°F9°C58°F15°C4 mph6 km/h from WestCloudyMostly Cloudy
May 443°F6°C65°F18°C4 mph6 km/h from NortheastMostly CloudyMostly Cloudy
May 545°F7°C67°F19°C10 mph16 km/h from EastDrizzleDrizzle
May 653°F12°C69°F21°C11 mph17 km/h from SoutheastDrizzleDrizzle
May 751°F11°C64°F18°C9 mph14 km/h from SouthwestMostly CloudyDrizzle
May 847°F8°C57°F14°C7 mph12 km/h from NorthCloudyPartly Cloudy
May 944°F7°C60°F16°C8 mph13 km/h from NorthPartly CloudyMostly Clear

Yes

Low of 44°F7°C, High of 64°F18°C
Wind: 4 mph6 km/h
Precipitation: None

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