Yes

you do need a jacket based on the weather in Ottawa, ON, Canada 4 minutes ago

Why? Because it's cold enough that makes you wish you had a hat, but you're still too proud to admit it!
42°F5°C & Cloudy

Wind is 3 mph5 km/h from the North, gusting to 8 mph13 km/h
April 20
10pm41°F5°C4 mph6 km/h NorthPartly Cloudy
11pm39°F4°C3 mph5 km/h NortheastMostly Cloudy
April 21
12am37°F3°C3 mph5 km/h NortheastMostly Cloudy
1am36°F2°C3 mph5 km/h NortheastMostly Cloudy
2am35°F2°C3 mph5 km/h NortheastCloudy
3am34°F1°C3 mph5 km/h NortheastCloudy
4am34°F1°C3 mph5 km/h NortheastMostly Cloudy
5am33°F1°C4 mph6 km/h NortheastMostly Cloudy
6am33°F1°C4 mph7 km/h EastMostly Cloudy
7am35°F2°C5 mph8 km/h EastMostly Cloudy
8am38°F3°C7 mph12 km/h EastMostly Cloudy
9am41°F5°C9 mph15 km/h EastMostly Cloudy
DateLowHighWindDayNight
April 2035°F2°C53°F12°C8 mph12 km/h from NorthwestMostly ClearMostly Cloudy
April 2133°F1°C52°F11°C10 mph17 km/h from EastRainRain
April 2243°F6°C50°F10°C13 mph21 km/h from WestCloudyMostly Cloudy
April 2338°F4°C55°F13°C6 mph10 km/h from NorthwestMostly CloudyPartly Cloudy
April 2438°F4°C62°F17°C4 mph6 km/h from SouthPartly CloudyMostly Cloudy
April 2544°F6°C69°F21°C8 mph13 km/h from EastMostly CloudyRain
April 2639°F4°C56°F14°C14 mph22 km/h from WestRainMostly Clear

Yes

Low of 33°F1°C, High of 52°F11°C
Wind: 10 mph17 km/h
Precipitation: 60% rain

Support This Page