Yes

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

Why? Because it's cold. simple as that.
38°F3°C & Mostly Clear

Wind is 9 mph14 km/h from the NW, gusting to 17 mph28 km/h
March 29
11am38°F4°C9 mph15 km/h NWMostly Clear
12pm41°F5°C10 mph16 km/h NWPartly Cloudy
1pm43°F6°C10 mph17 km/h NWMostly Cloudy
2pm44°F7°C11 mph17 km/h NWPartly Cloudy
3pm46°F8°C12 mph19 km/h NWPartly Cloudy
4pm46°F8°C12 mph20 km/h NWPartly Cloudy
5pm46°F8°C13 mph20 km/h NWPartly Cloudy
6pm45°F7°C12 mph19 km/h NWMostly Clear
7pm43°F6°C11 mph18 km/h NWMostly Clear
8pm40°F4°C10 mph16 km/h NWMostly Clear
9pm38°F3°C10 mph16 km/h NWMostly Clear
10pm36°F2°C10 mph16 km/h NWMostly Clear
DateLowHighWindDayNight
March 2928°F-2°C46°F8°C10 mph16 km/h from NWMostly ClearMostly Clear
March 3028°F-2°C45°F7°C10 mph15 km/h from NWMostly ClearMostly Cloudy
March 3130°F-1°C47°F9°C8 mph13 km/h from WPartly CloudyMostly Clear
April 130°F-1°C50°F10°C4 mph6 km/h from NEMostly CloudyMostly Cloudy
April 232°F0°C48°F9°C12 mph19 km/h from EMostly CloudyRain
April 332°F0°C38°F3°C16 mph25 km/h from ERainSnow
April 432°F-0°C40°F4°C11 mph18 km/h from NSnowMostly Cloudy

Yes

Low of 28°F-3°C, High of 46°F8°C
Wind: 10 mph15 km/h
Precipitation: None

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