Yes

you do need a jacket based on the weather in Leamington, ON N8H 1L2, Canada 1 second ago

Why? Because it's cold enough that makes you wish you had a hat, but you're still too proud to admit it and the wind is offering free, unsolicited face massages!
41°F5°C & Clear

Wind is 9 mph15 km/h from the Northwest, gusting to 22 mph36 km/h
November 6
5am40°F5°C10 mph16 km/h NorthwestClear
6am39°F4°C10 mph15 km/h NorthwestClear
7am38°F3°C8 mph13 km/h NorthwestClear
8am37°F3°C9 mph14 km/h NorthwestClear
9am36°F2°C8 mph14 km/h NorthwestClear
10am36°F2°C7 mph12 km/h NorthwestClear
11am35°F2°C7 mph12 km/h NorthwestClear
12pm37°F3°C8 mph13 km/h NorthwestClear
1pm38°F3°C7 mph12 km/h NorthwestClear
2pm41°F5°C7 mph11 km/h NorthwestClear
3pm45°F7°C7 mph11 km/h NorthwestClear
4pm47°F8°C7 mph12 km/h NorthwestClear
DateLowHighWindDayNight
November 540°F5°C58°F14°C17 mph27 km/h from WestWindyClear
November 635°F1°C50°F10°C7 mph12 km/h from WestMostly ClearCloudy
November 746°F8°C57°F14°C18 mph29 km/h from SouthwestRainPartly Cloudy
November 842°F5°C48°F9°C7 mph12 km/h from NorthMostly CloudyRain
November 932°F0°C45°F7°C18 mph29 km/h from NorthwestRainSnow
November 1028°F-2°C35°F2°C18 mph28 km/h from NorthwestSnowWindy
November 1128°F-2°C40°F4°C20 mph32 km/h from SouthwestWindyWindy

Yes

Low of 35°F2°C, High of 50°F10°C
Wind: 7 mph12 km/h
Precipitation: None

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