Yes

you do need a jacket based on the weather in Markham, ON, 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 it's so windy, your hat has officially retired from your head!
50°F10°C & Mostly Cloudy

Wind is 11 mph17 km/h from the Northwest, gusting to 22 mph35 km/h
May 31
9pm49°F9°C8 mph14 km/h NorthwestMostly Clear
10pm47°F8°C7 mph11 km/h NorthwestMostly Clear
11pm46°F8°C6 mph10 km/h NorthwestMostly Clear
June 1
12am44°F7°C6 mph10 km/h NorthwestMostly Clear
1am45°F7°C6 mph10 km/h NorthwestMostly Cloudy
2am45°F7°C9 mph14 km/h NorthwestMostly Cloudy
3am44°F7°C9 mph14 km/h NorthwestMostly Cloudy
4am43°F6°C8 mph13 km/h NorthwestPartly Cloudy
5am43°F6°C8 mph13 km/h NorthwestMostly Cloudy
6am44°F7°C9 mph14 km/h WestMostly Cloudy
7am45°F7°C10 mph15 km/h WestMostly Cloudy
8am47°F8°C11 mph17 km/h NorthwestPartly Cloudy
DateLowHighWindDayNight
May 3144°F7°C57°F14°C8 mph14 km/h from NorthwestCloudyPartly Cloudy
June 143°F6°C58°F14°C12 mph20 km/h from NorthwestMostly CloudyClear
June 244°F6°C72°F22°C7 mph12 km/h from WestMostly ClearPartly Cloudy
June 355°F13°C82°F28°C9 mph15 km/h from SouthwestMostly ClearMostly Clear
June 461°F16°C84°F29°C12 mph19 km/h from SouthwestMostly ClearDrizzle
June 560°F16°C74°F23°C6 mph10 km/h from WestDrizzleRain
June 657°F14°C70°F21°C7 mph12 km/h from NorthRainMostly Clear

Yes

Low of 43°F6°C, High of 58°F15°C
Wind: 12 mph20 km/h
Precipitation: None

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