Yes

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

Why? Because it's not very warm out!
58°F14°C & Cloudy

Wind is 8 mph13 km/h from the North, gusting to 14 mph22 km/h
October 15
7pm59°F15°C9 mph14 km/h NorthClear
8pm58°F15°C10 mph15 km/h NorthMostly Clear
9pm57°F14°C10 mph16 km/h NorthMostly Clear
10pm55°F13°C10 mph16 km/h NorthwestMostly Clear
11pm51°F11°C9 mph15 km/h NorthwestMostly Clear
October 16
12am48°F9°C9 mph14 km/h NorthwestMostly Clear
1am47°F8°C9 mph14 km/h NorthwestMostly Clear
2am46°F8°C8 mph13 km/h NorthMostly Clear
3am45°F7°C7 mph12 km/h NorthMostly Clear
4am44°F7°C7 mph11 km/h NorthMostly Clear
5am43°F6°C6 mph10 km/h NorthMostly Clear
6am42°F6°C6 mph9 km/h NorthMostly Clear
DateLowHighWindDayNight
October 1544°F7°C59°F15°C7 mph11 km/h from NorthMostly ClearMostly Clear
October 1638°F3°C58°F14°C8 mph12 km/h from NorthClearMostly Clear
October 1738°F3°C55°F13°C3 mph5 km/h from SouthwestMostly CloudyCloudy
October 1850°F10°C65°F18°C9 mph14 km/h from SouthPartly CloudyMostly Cloudy
October 1953°F12°C64°F18°C12 mph20 km/h from SouthRainRain
October 2049°F9°C58°F14°C10 mph17 km/h from WestDrizzleRain
October 2148°F9°C57°F14°C10 mph16 km/h from SouthwestRainThunderstorms

Yes

Low of 37°F3°C, High of 58°F15°C
Wind: 8 mph12 km/h
Precipitation: None

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