Yes

you do need a jacket based on the weather in Toronto, ON, Canada 3 minutes ago

Why? Because the cold's there, but it's just a reminder, not an invasion!
44°F7°C & Partly Cloudy

Wind is 4 mph7 km/h from the North, gusting to 9 mph14 km/h
April 4
1pm45°F7°C6 mph9 km/h NorthPartly Cloudy
2pm47°F8°C4 mph7 km/h NorthPartly Cloudy
3pm47°F8°C5 mph7 km/h SoutheastPartly Cloudy
4pm46°F8°C6 mph10 km/h SoutheastMostly Cloudy
5pm45°F7°C4 mph6 km/h SouthMostly Cloudy
6pm45°F7°C3 mph4 km/h SoutheastCloudy
7pm45°F7°C3 mph4 km/h EastCloudy
8pm44°F6°C2 mph4 km/h EastCloudy
9pm43°F6°C4 mph6 km/h EastCloudy
10pm42°F6°C5 mph7 km/h EastCloudy
11pm41°F5°C5 mph9 km/h EastCloudy
April 5
12am41°F5°C7 mph11 km/h EastCloudy
DateLowHighWindDayNight
April 436°F2°C47°F9°C5 mph8 km/h from NorthPartly CloudyRain
April 538°F3°C51°F10°C8 mph14 km/h from NortheastRainCloudy
April 633°F1°C42°F6°C9 mph15 km/h from NorthwestMostly CloudyMostly Cloudy
April 730°F-1°C41°F5°C6 mph10 km/h from SouthwestRainSnow
April 824°F-4°C31°F-0°C15 mph25 km/h from NorthwestWindyMostly Clear
April 925°F-4°C40°F4°C9 mph14 km/h from SouthwestMostly CloudyMostly Cloudy
April 1032°F-0°C43°F6°C7 mph12 km/h from EastDrizzleRain

Yes

Low of 38°F4°C, High of 51°F11°C
Wind: 8 mph14 km/h
Precipitation: 89% rain

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