Yes

you do need a jacket based on the weather in Ottawa, ON, Canada 3 minutes ago

Why? Because it's cool enough your breath is visible, but your nose isn’t red yet and it's so windy, your hat has officially retired from your head!
41°F5°C & Mostly Clear

Wind is 8 mph13 km/h from the North, gusting to 23 mph37 km/h
May 11
3am39°F4°C7 mph11 km/h NorthClear
4am38°F3°C6 mph10 km/h NorthwestClear
5am37°F3°C6 mph10 km/h NorthwestClear
6am36°F2°C6 mph9 km/h NorthwestClear
7am37°F3°C8 mph12 km/h NorthClear
8am40°F4°C8 mph13 km/h NorthClear
9am43°F6°C7 mph12 km/h NorthClear
10am47°F8°C7 mph11 km/h NorthClear
11am51°F10°C7 mph10 km/h NorthwestClear
12pm54°F12°C6 mph10 km/h NorthwestClear
1pm58°F14°C6 mph10 km/h NorthwestClear
2pm60°F16°C6 mph9 km/h NorthwestClear
DateLowHighWindDayNight
May 1136°F2°C63°F17°C6 mph9 km/h from NorthwestClearPartly Cloudy
May 1245°F7°C75°F24°C6 mph10 km/h from WestMostly ClearMostly Clear
May 1352°F11°C78°F25°C7 mph11 km/h from SoutheastMostly CloudyMostly Cloudy
May 1458°F14°C73°F23°C6 mph10 km/h from SouthCloudyCloudy
May 1559°F15°C70°F21°C3 mph5 km/h from SoutheastCloudyMostly Clear
May 1657°F14°C77°F25°C6 mph10 km/h from SouthDrizzleMostly Cloudy
May 1759°F15°C75°F24°C10 mph16 km/h from SouthwestPartly CloudyMostly Cloudy

Yes

Low of 45°F7°C, High of 75°F24°C
Wind: 6 mph10 km/h
Precipitation: None

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