Yes

you do need a jacket based on the weather in Toronto, ON, Canada 4 minutes ago

Why? Because it's quite chilly!
44°F7°C & Partly Cloudy

Wind is 4 mph7 km/h from the Northeast, gusting to 9 mph14 km/h
May 12
2am44°F7°C5 mph8 km/h NortheastClear
3am44°F7°C5 mph8 km/h NortheastClear
4am44°F7°C5 mph8 km/h NortheastClear
5am44°F6°C5 mph8 km/h NortheastClear
6am44°F6°C4 mph7 km/h NortheastClear
7am45°F7°C3 mph5 km/h NortheastClear
8am49°F9°C4 mph7 km/h EastClear
9am51°F11°C3 mph5 km/h EastClear
10am55°F13°C2 mph3 km/h EastClear
11am59°F15°C2 mph4 km/h SoutheastClear
12pm62°F17°C4 mph7 km/h SoutheastClear
1pm65°F18°C5 mph8 km/h SouthClear
DateLowHighWindDayNight
May 1244°F6°C71°F21°C4 mph6 km/h from SoutheastMostly ClearMostly Cloudy
May 1352°F11°C62°F17°C8 mph13 km/h from EastRainRain
May 1453°F12°C63°F17°C10 mph16 km/h from EastRainMostly Cloudy
May 1554°F12°C68°F20°C5 mph8 km/h from EastDrizzleThunderstorms
May 1654°F12°C74°F23°C6 mph10 km/h from SouthDrizzlePartly Cloudy
May 1754°F12°C69°F21°C10 mph15 km/h from SouthwestRainPartly Cloudy
May 1854°F12°C68°F20°C8 mph12 km/h from WestPartly CloudyPartly Cloudy

Yes

Low of 53°F12°C, High of 63°F17°C
Wind: 8 mph13 km/h
Precipitation: 56% rain

Support This Page