Yes

you do need a jacket based on the weather in Mississauga (Erin Mills), Ontario, Canada 1 second ago

Why? Because it's quite chilly!
43°F6°C & Clear

Wind is 7 mph12 km/h from the Southwest, gusting to 16 mph25 km/h
November 3
5am43°F6°C8 mph12 km/h SouthwestClear
6am43°F6°C9 mph14 km/h SouthwestMostly Cloudy
7am43°F6°C8 mph13 km/h SouthwestMostly Cloudy
8am42°F6°C8 mph13 km/h SouthwestCloudy
9am44°F6°C10 mph16 km/h SouthwestCloudy
10am44°F7°C10 mph17 km/h SouthwestCloudy
11am44°F7°C11 mph18 km/h SouthwestCloudy
12pm45°F7°C12 mph19 km/h SouthwestCloudy
1pm45°F7°C14 mph22 km/h SouthwestCloudy
2pm46°F8°C15 mph25 km/h SouthwestWindy
3pm46°F8°C17 mph28 km/h SouthwestWindy
4pm45°F7°C18 mph29 km/h SouthwestDrizzle
DateLowHighWindDayNight
November 230°F-1°C51°F11°C3 mph5 km/h from SoutheastMostly ClearPartly Cloudy
November 342°F6°C50°F10°C16 mph26 km/h from WestDrizzleClear
November 440°F4°C54°F12°C12 mph19 km/h from WestMostly ClearCloudy
November 542°F5°C54°F12°C11 mph18 km/h from WestDrizzleDrizzle
November 637°F3°C48°F9°C7 mph11 km/h from NorthwestMostly ClearMostly Cloudy
November 738°F4°C54°F12°C11 mph17 km/h from SouthRainRain
November 838°F3°C48°F9°C9 mph15 km/h from NorthwestMostly CloudySnow

Yes

Low of 43°F6°C, High of 51°F11°C
Wind: 16 mph26 km/h
Precipitation: 60% rain

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