Yes

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

Why? Because it's not very warm out and it's so windy, even the squirrels are holding onto branches for dear life!
53°F12°C & Cloudy

Wind is 9 mph14 km/h from the East, gusting to 23 mph37 km/h
April 25
11pm52°F11°C9 mph14 km/h EastCloudy
April 26
12am51°F11°C8 mph13 km/h EastCloudy
1am51°F10°C7 mph11 km/h EastCloudy
2am50°F10°C7 mph12 km/h EastCloudy
3am49°F9°C7 mph11 km/h EastCloudy
4am48°F9°C7 mph11 km/h EastCloudy
5am48°F9°C7 mph11 km/h EastCloudy
6am48°F9°C7 mph11 km/h EastRain
7am48°F9°C6 mph10 km/h EastDrizzle
8am48°F9°C5 mph9 km/h NortheastDrizzle
9am49°F9°C5 mph8 km/h NortheastDrizzle
10am50°F10°C5 mph8 km/h NortheastCloudy
DateLowHighWindDayNight
April 2546°F8°C63°F17°C5 mph8 km/h from EastMostly CloudyRain
April 2640°F4°C54°F12°C6 mph9 km/h from NorthRainRain
April 2739°F4°C62°F17°C14 mph23 km/h from NorthDrizzleClear
April 2841°F5°C67°F20°C6 mph9 km/h from SouthwestMostly ClearPartly Cloudy
April 2946°F8°C68°F20°C11 mph18 km/h from SouthwestRainRain
April 3037°F3°C55°F13°C11 mph18 km/h from NorthwestMostly ClearClear
May 134°F1°C58°F14°C6 mph9 km/h from SoutheastMostly CloudyDrizzle

Yes

Low of 40°F5°C, High of 55°F13°C
Wind: 6 mph9 km/h
Precipitation: 89% rain

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