Yes

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

Why? Because rain: where every drop seems to aim directly at your glasses!
63°F17°C & Rain

Wind is 4 mph6 km/h from the Northwest, gusting to 12 mph19 km/h
June 5
3am63°F17°C4 mph7 km/h NorthwestRain
4am62°F17°C5 mph8 km/h NorthwestCloudy
5am61°F16°C6 mph10 km/h NorthwestCloudy
6am60°F16°C6 mph10 km/h NorthCloudy
7am60°F16°C6 mph10 km/h NorthCloudy
8am61°F16°C6 mph10 km/h NorthCloudy
9am61°F16°C6 mph10 km/h NorthRain
10am62°F17°C6 mph10 km/h NorthRain
11am63°F17°C6 mph9 km/h NorthCloudy
12pm65°F18°C5 mph9 km/h NorthCloudy
1pm67°F19°C6 mph9 km/h NorthCloudy
2pm68°F20°C6 mph9 km/h NorthCloudy
DateLowHighWindDayNight
June 560°F16°C70°F21°C5 mph9 km/h from NorthRainMostly Cloudy
June 658°F15°C72°F22°C4 mph7 km/h from SoutheastMostly CloudyPartly Cloudy
June 758°F14°C74°F23°C10 mph15 km/h from NorthwestMostly ClearPartly Cloudy
June 854°F12°C68°F20°C9 mph15 km/h from EastPartly CloudyDrizzle
June 955°F13°C72°F22°C9 mph15 km/h from SouthwestRainRain
June 1055°F13°C71°F22°C7 mph10 km/h from WestPartly CloudyPartly Cloudy
June 1155°F13°C74°F23°C6 mph10 km/h from WestMostly ClearClear

Yes

Low of 58°F15°C, High of 72°F22°C
Wind: 4 mph7 km/h
Precipitation: 21% rain

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