Yes

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

Why? Because it's cold. simple as that.
38°F3°C & Mostly Cloudy

Wind is 11 mph17 km/h from the NW, gusting to 21 mph34 km/h
March 29
11am38°F3°C11 mph18 km/h NWMostly Cloudy
12pm40°F4°C11 mph18 km/h NWMostly Cloudy
1pm41°F5°C12 mph19 km/h NWMostly Cloudy
2pm43°F6°C12 mph20 km/h NWCloudy
3pm44°F7°C13 mph20 km/h NWCloudy
4pm44°F7°C13 mph21 km/h NWMostly Cloudy
5pm43°F6°C13 mph21 km/h NWMostly Cloudy
6pm41°F5°C12 mph20 km/h NWMostly Cloudy
7pm39°F4°C11 mph18 km/h NWPartly Cloudy
8pm37°F3°C11 mph17 km/h NWPartly Cloudy
9pm36°F2°C9 mph15 km/h NWPartly Cloudy
10pm34°F1°C9 mph15 km/h NWPartly Cloudy
DateLowHighWindDayNight
March 2928°F-2°C44°F7°C10 mph17 km/h from NWMostly CloudyPartly Cloudy
March 3029°F-2°C47°F9°C4 mph6 km/h from SWMostly CloudyCloudy
March 3132°F-0°C48°F9°C7 mph11 km/h from NWMostly CloudyCloudy
April 133°F0°C52°F11°C6 mph10 km/h from NEMostly CloudyMostly Cloudy
April 238°F3°C44°F6°C15 mph25 km/h from ERainRain
April 335°F2°C40°F4°C13 mph22 km/h from ERainDrizzle
April 432°F0°C42°F6°C14 mph22 km/h from NWCloudyPartly Cloudy

Yes

Low of 28°F-2°C, High of 47°F9°C
Wind: 4 mph6 km/h
Precipitation: None

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