Yes

you do need a jacket based on the weather in Ottawa (Orléans), Ontario, Canada 1 second ago

Why? Because rain's coming down and you're not freezing, but you’ll definitely start complaining if it lasts much longer and it's windy enough to give you a brand new hairdo!
48°F9°C & Rain

Wind is 10 mph16 km/h from the East, gusting to 22 mph35 km/h
April 21
6pm48°F9°C11 mph18 km/h EastRain
7pm46°F8°C11 mph18 km/h EastRain
8pm46°F8°C10 mph16 km/h EastRain
9pm46°F8°C10 mph15 km/h EastDrizzle
10pm47°F8°C11 mph17 km/h EastDrizzle
11pm48°F9°C8 mph13 km/h EastCloudy
April 22
12am49°F9°C8 mph12 km/h SoutheastCloudy
1am49°F9°C5 mph8 km/h SoutheastDrizzle
2am50°F10°C6 mph10 km/h SouthCloudy
3am51°F10°C7 mph12 km/h SouthwestCloudy
4am49°F10°C9 mph15 km/h SouthwestMostly Cloudy
5am47°F9°C9 mph14 km/h SouthwestMostly Cloudy
DateLowHighWindDayNight
April 2129°F-1°C54°F12°C12 mph19 km/h from EastRainRain
April 2243°F6°C51°F10°C13 mph21 km/h from WestCloudyPartly Cloudy
April 2337°F3°C58°F14°C8 mph13 km/h from NorthwestPartly CloudyMostly Clear
April 2435°F2°C58°F14°C5 mph8 km/h from EastMostly CloudyCloudy
April 2543°F6°C62°F17°C6 mph9 km/h from EastCloudyRain
April 2645°F7°C58°F14°C9 mph14 km/h from NortheastDrizzlePartly Cloudy
April 2741°F5°C63°F17°C7 mph11 km/h from NorthMostly ClearPartly Cloudy

Yes

Low of 43°F6°C, High of 51°F11°C
Wind: 13 mph21 km/h
Precipitation: None

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