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!
44°F7°C & Cloudy

Wind is 4 mph7 km/h from the Northwest, gusting to 7 mph12 km/h
November 8
8pm44°F7°C5 mph7 km/h NorthMostly Cloudy
9pm43°F6°C5 mph9 km/h NorthCloudy
10pm42°F5°C6 mph10 km/h NorthCloudy
11pm40°F4°C6 mph10 km/h NortheastCloudy
November 9
12am39°F4°C7 mph12 km/h NortheastCloudy
1am38°F3°C7 mph11 km/h NortheastCloudy
2am37°F3°C7 mph11 km/h NortheastCloudy
3am37°F3°C8 mph12 km/h NortheastCloudy
4am37°F3°C7 mph12 km/h NortheastCloudy
5am36°F2°C7 mph12 km/h NortheastCloudy
6am35°F2°C7 mph12 km/h NortheastCloudy
7am35°F2°C7 mph11 km/h NortheastCloudy
DateLowHighWindDayNight
November 836°F2°C48°F9°C5 mph8 km/h from NorthPartly CloudyFlurries
November 930°F-1°C36°F2°C13 mph20 km/h from NorthSnowMostly Cloudy
November 1025°F-4°C34°F1°C10 mph16 km/h from NorthwestPartly CloudyPartly Cloudy
November 1124°F-4°C38°F4°C11 mph18 km/h from WestMostly CloudyCloudy
November 1235°F1°C44°F6°C14 mph22 km/h from WestCloudyPartly Cloudy
November 1337°F3°C44°F7°C13 mph21 km/h from WestPartly CloudyPartly Cloudy
November 1435°F2°C42°F6°C7 mph11 km/h from NorthwestMostly CloudyPartly Cloudy

Yes

Low of 29°F-2°C, High of 37°F3°C
Wind: 13 mph20 km/h
Precipitation: 77% snow

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