Yes

you do need a jacket based on the weather in Hamilton, ON, Canada 2 minutes ago

Why? Because you're not freezing, but you’ll definitely start complaining if it lasts much longer and the wind is harsh and biting!
50°F10°C & Cloudy

Wind is 11 mph18 km/h from the Northwest, gusting to 25 mph40 km/h
April 26
9am49°F10°C12 mph20 km/h NorthwestCloudy
10am49°F9°C14 mph22 km/h NorthwestCloudy
11am49°F10°C14 mph23 km/h NorthwestMostly Cloudy
12pm51°F11°C16 mph27 km/h NorthwestWindy
1pm51°F11°C17 mph28 km/h NorthwestWindy
2pm52°F11°C18 mph28 km/h NorthwestWindy
3pm52°F11°C18 mph29 km/h NorthwestWindy
4pm51°F11°C18 mph29 km/h NorthwestWindy
5pm50°F10°C18 mph29 km/h NorthwestWindy
6pm49°F9°C17 mph28 km/h NorthwestWindy
7pm48°F9°C17 mph27 km/h NorthwestWindy
8pm46°F8°C16 mph25 km/h NorthwestWindy
DateLowHighWindDayNight
April 2645°F7°C53°F12°C16 mph25 km/h from NorthwestWindyPartly Cloudy
April 2741°F5°C66°F19°C10 mph16 km/h from NorthClearMostly Clear
April 2842°F6°C68°F20°C6 mph10 km/h from SouthMostly ClearPartly Cloudy
April 2946°F8°C76°F24°C19 mph31 km/h from SouthwestDrizzleMostly Clear
April 3038°F4°C58°F14°C5 mph9 km/h from NortheastPartly CloudyMostly Cloudy
May 142°F6°C51°F11°C8 mph13 km/h from NortheastRainRain
May 248°F9°C60°F15°C9 mph15 km/h from WestRainDrizzle

Yes

Low of 42°F6°C, High of 65°F19°C
Wind: 10 mph16 km/h
Precipitation: None

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