Yes

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

Why? Because it's not very warm out!
50°F10°C & Partly Cloudy

Wind is 6 mph9 km/h from the North, gusting to 14 mph23 km/h
August 27
10pm49°F9°C6 mph10 km/h NorthMostly Cloudy
11pm49°F9°C6 mph10 km/h NorthPartly Cloudy
August 28
12am48°F9°C7 mph11 km/h NorthCloudy
1am49°F9°C7 mph12 km/h NorthCloudy
2am48°F9°C8 mph13 km/h NorthCloudy
3am48°F9°C8 mph12 km/h NorthCloudy
4am47°F9°C8 mph13 km/h NorthCloudy
5am47°F8°C8 mph12 km/h NorthCloudy
6am47°F8°C7 mph12 km/h NorthCloudy
7am46°F8°C7 mph12 km/h NorthCloudy
8am47°F8°C8 mph13 km/h NorthMostly Cloudy
9am48°F9°C8 mph13 km/h NorthMostly Cloudy
DateLowHighWindDayNight
August 2748°F9°C57°F14°C9 mph14 km/h from NorthMostly CloudyMostly Cloudy
August 2846°F8°C63°F17°C6 mph10 km/h from NorthMostly CloudyMostly Clear
August 2945°F7°C71°F22°C5 mph8 km/h from SouthwestClearMostly Clear
August 3052°F11°C76°F25°C6 mph9 km/h from NorthwestMostly ClearMostly Clear
August 3155°F13°C76°F24°C3 mph4 km/h from SoutheastMostly ClearClear
September 158°F15°C82°F28°C6 mph10 km/h from SouthwestClearMostly Clear
September 261°F16°C77°F25°C10 mph15 km/h from SouthwestDrizzleRain

Yes

Low of 46°F8°C, High of 64°F18°C
Wind: 6 mph10 km/h
Precipitation: None

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