Yes

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

Why? Because it's quite chilly.
42°F6°C & Mostly Cloudy

Wind is 7 mph11 km/h from the W, gusting to 15 mph24 km/h
March 28
12pm43°F6°C7 mph12 km/h WPartly Cloudy
1pm45°F7°C7 mph12 km/h WPartly Cloudy
2pm46°F8°C7 mph11 km/h WPartly Cloudy
3pm47°F9°C6 mph10 km/h SWMostly Cloudy
4pm48°F9°C6 mph10 km/h SWMostly Cloudy
5pm49°F9°C6 mph9 km/h SWMostly Cloudy
6pm48°F9°C5 mph8 km/h SWMostly Cloudy
7pm46°F8°C4 mph6 km/h SWMostly Cloudy
8pm44°F6°C4 mph6 km/h SWMostly Cloudy
9pm42°F5°C4 mph7 km/h SWMostly Cloudy
10pm40°F4°C4 mph7 km/h WCloudy
11pm38°F3°C5 mph8 km/h WMostly Cloudy
DateLowHighWindDayNight
March 2837°F3°C49°F9°C6 mph9 km/h from WMostly CloudyPartly Cloudy
March 2929°F-2°C46°F8°C10 mph16 km/h from NWPartly CloudyMostly Clear
March 3029°F-2°C45°F7°C8 mph13 km/h from NWMostly ClearCloudy
March 3130°F-1°C47°F8°C8 mph12 km/h from NWPartly CloudyClear
April 128°F-2°C49°F10°C4 mph6 km/h from EPartly CloudyCloudy
April 235°F1°C42°F5°C10 mph17 km/h from EDrizzleRain
April 333°F1°C38°F3°C9 mph15 km/h from ERainSnow

Yes

Low of 29°F-2°C, High of 46°F8°C
Wind: 10 mph16 km/h
Precipitation: None

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