Yes

you do need a jacket based on the weather in Ottawa, ON K1T 0L5, Canada 1 second ago

Why? Because it's pretty chilly and it's windy enough to give you a brand new hairdo!
53°F12°C & Cloudy

Wind is 10 mph16 km/h from the East, gusting to 21 mph33 km/h
April 25
10pm53°F12°C10 mph16 km/h EastCloudy
11pm52°F11°C10 mph17 km/h EastCloudy
April 26
12am51°F11°C11 mph17 km/h EastCloudy
1am50°F10°C10 mph16 km/h EastCloudy
2am50°F10°C9 mph14 km/h EastCloudy
3am49°F9°C8 mph13 km/h EastCloudy
4am49°F9°C9 mph14 km/h EastDrizzle
5am49°F9°C8 mph12 km/h EastDrizzle
6am48°F9°C7 mph11 km/h EastDrizzle
7am48°F9°C7 mph12 km/h EastRain
8am48°F9°C6 mph10 km/h NortheastDrizzle
9am49°F9°C5 mph8 km/h NortheastDrizzle
DateLowHighWindDayNight
April 2546°F8°C61°F16°C5 mph7 km/h from EastMostly CloudyRain
April 2640°F4°C54°F12°C6 mph10 km/h from NorthRainRain
April 2738°F4°C63°F17°C15 mph24 km/h from NorthDrizzleClear
April 2840°F4°C68°F20°C6 mph10 km/h from SouthwestMostly ClearPartly Cloudy
April 2946°F8°C68°F20°C13 mph21 km/h from SouthwestRainRain
April 3037°F3°C55°F13°C12 mph19 km/h from NorthwestMostly ClearClear
May 132°F0°C58°F15°C6 mph9 km/h from SouthMostly CloudyRain

Yes

Low of 40°F5°C, High of 55°F13°C
Wind: 6 mph10 km/h
Precipitation: 91% rain

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