Yes

you do need a jacket based on the weather in Toronto, ON M5V 3T5, Canada 3 minutes ago

Why? Because it's pretty chilly!
58°F14°C & Clear

Wind is 5 mph8 km/h from the Northeast, gusting to 11 mph17 km/h
September 17
5am57°F14°C5 mph8 km/h NortheastClear
6am56°F14°C5 mph8 km/h NorthClear
7am56°F14°C5 mph8 km/h NorthMostly Clear
8am58°F15°C5 mph8 km/h NorthMostly Clear
9am63°F17°C4 mph7 km/h NortheastMostly Clear
10am67°F20°C4 mph6 km/h NortheastPartly Cloudy
11am70°F21°C4 mph7 km/h EastMostly Cloudy
12pm72°F22°C4 mph7 km/h EastMostly Cloudy
1pm74°F23°C5 mph8 km/h EastMostly Cloudy
2pm74°F24°C5 mph8 km/h SoutheastMostly Cloudy
3pm75°F24°C5 mph7 km/h SoutheastMostly Cloudy
4pm76°F24°C5 mph8 km/h SoutheastMostly Cloudy
DateLowHighWindDayNight
September 1756°F14°C76°F24°C4 mph7 km/h from EastPartly CloudyMostly Clear
September 1859°F15°C78°F25°C4 mph6 km/h from WestMostly ClearMostly Clear
September 1956°F13°C70°F21°C5 mph8 km/h from NorthClearClear
September 2052°F11°C64°F18°C10 mph17 km/h from EastClearMostly Clear
September 2157°F14°C74°F23°C7 mph12 km/h from SoutheastMostly ClearPartly Cloudy
September 2264°F18°C75°F24°C8 mph13 km/h from SouthRainDrizzle
September 2363°F17°C74°F23°C6 mph9 km/h from SouthDrizzleRain

No

Low of 59°F15°C, High of 78°F26°C
Wind: 4 mph6 km/h
Precipitation: 44% rain

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