Yes

you do need a jacket based on the weather in Ottawa, ON, Canada 1 minute ago

Why? Because sorry, it's too cool for just a hoodie and there are strong winds blowing out there!
54°F12°C & Cloudy

Wind is 9 mph15 km/h from the Northwest, gusting to 26 mph42 km/h
May 31
7pm53°F12°C10 mph16 km/h NorthwestCloudy
8pm51°F11°C11 mph18 km/h NorthwestCloudy
9pm49°F9°C10 mph16 km/h NorthwestCloudy
10pm48°F9°C11 mph17 km/h NorthwestCloudy
11pm47°F8°C11 mph18 km/h NorthwestCloudy
June 1
12am46°F8°C11 mph18 km/h NorthwestCloudy
1am45°F7°C11 mph17 km/h NorthwestCloudy
2am45°F7°C11 mph17 km/h NorthwestCloudy
3am44°F7°C10 mph17 km/h WestCloudy
4am44°F7°C10 mph17 km/h WestCloudy
5am44°F7°C10 mph17 km/h WestCloudy
6am44°F7°C11 mph17 km/h WestCloudy
DateLowHighWindDayNight
May 3146°F8°C57°F14°C8 mph13 km/h from NorthDrizzleCloudy
June 144°F7°C54°F12°C12 mph19 km/h from WestCloudyPartly Cloudy
June 245°F7°C68°F20°C8 mph13 km/h from WestMostly ClearPartly Cloudy
June 350°F10°C80°F27°C8 mph13 km/h from SouthMostly ClearPartly Cloudy
June 460°F16°C85°F29°C11 mph17 km/h from SouthwestMostly ClearRain
June 563°F17°C76°F24°C7 mph11 km/h from SouthwestRainRain
June 657°F14°C69°F20°C6 mph10 km/h from NortheastRainDrizzle

Yes

Low of 45°F7°C, High of 54°F12°C
Wind: 12 mph19 km/h
Precipitation: 24% rain

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