Yes

you do need a jacket based on the weather in Mississauga (Erin Mills), Ontario, Canada 1 second ago

Why? Because it's pretty chilly and it's fairly windy outside!
53°F12°C & Partly Cloudy

Wind is 10 mph16 km/h from the West, gusting to 20 mph32 km/h
May 2
8am55°F13°C10 mph17 km/h WestPartly Cloudy
9am56°F14°C13 mph21 km/h WestMostly Cloudy
10am58°F14°C14 mph23 km/h WestPartly Cloudy
11am59°F15°C16 mph26 km/h WestWindy
12pm60°F16°C15 mph25 km/h WestWindy
1pm62°F17°C15 mph25 km/h WestWindy
2pm63°F17°C14 mph23 km/h WestPartly Cloudy
3pm64°F18°C14 mph22 km/h WestPartly Cloudy
4pm64°F18°C14 mph22 km/h WestMostly Cloudy
5pm64°F18°C13 mph20 km/h WestPartly Cloudy
6pm62°F16°C12 mph19 km/h WestMostly Cloudy
7pm60°F15°C10 mph16 km/h NorthwestPartly Cloudy
DateLowHighWindDayNight
May 245°F7°C64°F18°C13 mph22 km/h from WestPartly CloudyMostly Cloudy
May 344°F6°C54°F12°C7 mph11 km/h from NortheastDrizzleCloudy
May 444°F7°C55°F13°C9 mph15 km/h from NortheastDrizzleRain
May 548°F9°C56°F13°C11 mph18 km/h from EastDrizzleDrizzle
May 649°F10°C62°F17°C6 mph10 km/h from SouthwestDrizzlePartly Cloudy
May 750°F10°C63°F17°C8 mph13 km/h from NorthwestMostly CloudyPartly Cloudy
May 846°F8°C58°F14°C7 mph10 km/h from NortheastPartly CloudyClear

Yes

Low of 44°F7°C, High of 55°F13°C
Wind: 7 mph11 km/h
Precipitation: 44% rain

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