Yes

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

Why? Because the cold's there, but it's just a reminder, not an invasion and there are strong winds blowing out there!
41°F5°C & Mostly Clear

Wind is 8 mph13 km/h from the West, gusting to 27 mph44 km/h
November 4
8am41°F5°C9 mph14 km/h WestMostly Clear
9am40°F5°C9 mph15 km/h WestMostly Clear
10am40°F4°C10 mph16 km/h WestMostly Clear
11am39°F4°C9 mph15 km/h WestClear
12pm39°F4°C10 mph16 km/h WestClear
1pm40°F4°C10 mph17 km/h WestClear
2pm42°F6°C11 mph17 km/h WestClear
3pm45°F7°C11 mph18 km/h WestClear
4pm47°F8°C12 mph19 km/h WestMostly Clear
5pm49°F9°C13 mph20 km/h WestMostly Clear
6pm50°F10°C14 mph22 km/h WestMostly Clear
7pm50°F10°C13 mph21 km/h WestMostly Clear
DateLowHighWindDayNight
November 438°F3°C50°F10°C11 mph17 km/h from WestClearPartly Cloudy
November 538°F3°C44°F7°C6 mph10 km/h from EastRainDrizzle
November 629°F-2°C39°F4°C9 mph15 km/h from NorthwestPartly CloudyPartly Cloudy
November 729°F-2°C43°F6°C7 mph12 km/h from SoutheastRainRain
November 831°F-1°C43°F6°C7 mph11 km/h from NorthwestMostly CloudyMostly Cloudy
November 929°F-2°C35°F2°C5 mph9 km/h from NortheastSnowSnow
November 1026°F-3°C32°F-0°C9 mph15 km/h from NorthwestMostly CloudyPartly Cloudy

Yes

Low of 37°F3°C, High of 44°F7°C
Wind: 6 mph10 km/h
Precipitation: 89% rain

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