Yes

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

Why? Because just cool enough for a jacket, but not warm enough to ditch it!
59°F15°C & Clear

Wind is 12 mph20 km/h from the Northwest, gusting to 18 mph29 km/h
May 19
5pm58°F15°C12 mph20 km/h NorthClear
6pm57°F14°C12 mph20 km/h NorthwestClear
7pm56°F13°C12 mph19 km/h NorthClear
8pm53°F12°C11 mph18 km/h NorthClear
9pm50°F10°C8 mph13 km/h NorthClear
10pm47°F8°C9 mph14 km/h NorthClear
11pm45°F7°C8 mph13 km/h NorthClear
May 20
12am44°F7°C8 mph13 km/h NorthClear
1am43°F6°C7 mph11 km/h NorthClear
2am42°F5°C7 mph11 km/h NorthClear
3am40°F5°C7 mph11 km/h NorthClear
4am40°F4°C7 mph11 km/h NorthClear
DateLowHighWindDayNight
May 1944°F7°C59°F15°C8 mph13 km/h from NorthMostly ClearClear
May 2039°F4°C60°F15°C6 mph9 km/h from NortheastPartly CloudyCloudy
May 2146°F8°C54°F12°C13 mph22 km/h from EastRainRain
May 2245°F7°C49°F10°C13 mph21 km/h from EastRainRain
May 2345°F7°C51°F11°C7 mph11 km/h from NorthDrizzleDrizzle
May 2446°F8°C58°F14°C9 mph14 km/h from NorthwestMostly CloudyPartly Cloudy
May 2545°F7°C62°F17°C8 mph12 km/h from NorthwestMostly CloudyMostly Clear

Yes

Low of 39°F4°C, High of 60°F16°C
Wind: 6 mph9 km/h
Precipitation: None

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