Yes

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

Why? Because it's bitterly cold.
35°F2°C & Mostly Clear

Wind is 7 mph12 km/h from the NW, gusting to 16 mph25 km/h
March 29
10am36°F2°C8 mph13 km/h NWPartly Cloudy
11am38°F4°C8 mph13 km/h NWPartly Cloudy
12pm41°F5°C9 mph15 km/h NWMostly Cloudy
1pm43°F6°C11 mph17 km/h WMostly Cloudy
2pm44°F7°C12 mph20 km/h WMostly Cloudy
3pm45°F7°C13 mph21 km/h WMostly Cloudy
4pm46°F8°C13 mph21 km/h NWMostly Cloudy
5pm45°F7°C13 mph21 km/h NWMostly Cloudy
6pm43°F6°C13 mph21 km/h NWPartly Cloudy
7pm41°F5°C12 mph19 km/h NWPartly Cloudy
8pm38°F3°C10 mph16 km/h NWMostly Clear
9pm36°F2°C9 mph14 km/h NWMostly Clear
DateLowHighWindDayNight
March 2930°F-1°C46°F8°C10 mph16 km/h from NWPartly CloudyMostly Clear
March 3029°F-1°C44°F7°C4 mph6 km/h from SEMostly CloudyDrizzle
March 3132°F0°C49°F9°C5 mph8 km/h from WMostly CloudyRain
April 135°F2°C51°F10°C9 mph15 km/h from NEMostly CloudyCloudy
April 239°F4°C44°F6°C17 mph28 km/h from ERainRain
April 335°F2°C41°F5°C16 mph26 km/h from NERainRain
April 434°F1°C43°F6°C14 mph23 km/h from NCloudyMostly Clear

Yes

Low of 29°F-2°C, High of 45°F7°C
Wind: 4 mph6 km/h
Precipitation: None

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