Yes

you do need a jacket based on the weather in Newmarket, ON, Canada 1 second ago

Why? Because too cold for just a hoodie, too warm for a parka!
43°F6°C & Cloudy

Wind is 7 mph12 km/h from the Northwest, gusting to 18 mph29 km/h
November 1
7pm44°F7°C8 mph13 km/h NorthwestMostly Cloudy
8pm44°F7°C8 mph13 km/h NorthwestPartly Cloudy
9pm43°F6°C7 mph11 km/h NorthwestMostly Cloudy
10pm41°F5°C4 mph7 km/h NorthMostly Cloudy
11pm40°F5°C3 mph5 km/h NorthMostly Cloudy
November 2
12am39°F4°C3 mph4 km/h NorthwestMostly Cloudy
1am39°F4°C3 mph5 km/h NorthPartly Cloudy
2am38°F3°C3 mph4 km/h NorthwestPartly Cloudy
3am37°F3°C2 mph4 km/h NorthwestPartly Cloudy
4am36°F2°C3 mph4 km/h WestPartly Cloudy
5am35°F2°C3 mph5 km/h SouthwestPartly Cloudy
6am35°F1°C3 mph5 km/h SouthwestPartly Cloudy
DateLowHighWindDayNight
November 136°F2°C44°F7°C7 mph11 km/h from NorthwestMostly CloudyPartly Cloudy
November 232°F0°C50°F10°C6 mph10 km/h from SouthwestPartly CloudyPartly Cloudy
November 341°F5°C49°F10°C14 mph23 km/h from SouthwestMostly CloudyMostly Clear
November 438°F3°C54°F12°C12 mph19 km/h from WestMostly ClearMostly Cloudy
November 539°F4°C49°F9°C7 mph12 km/h from SouthwestRainPartly Cloudy
November 636°F2°C48°F9°C8 mph13 km/h from NorthwestMostly CloudyMostly Cloudy
November 738°F3°C53°F12°C12 mph20 km/h from SouthDrizzleDrizzle

Yes

Low of 33°F1°C, High of 50°F10°C
Wind: 6 mph10 km/h
Precipitation: None

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