Yes

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

Why? Because there's a refreshing nip in the air!
47°F8°C & Clear

Wind is 7 mph12 km/h from the Southwest, gusting to 18 mph29 km/h
November 2
8pm47°F8°C8 mph13 km/h SouthwestPartly Cloudy
9pm46°F8°C5 mph9 km/h SouthwestMostly Clear
10pm43°F6°C5 mph8 km/h SouthPartly Cloudy
11pm41°F5°C6 mph9 km/h SouthMostly Clear
November 3
12am40°F4°C7 mph11 km/h SouthMostly Clear
1am38°F3°C7 mph11 km/h SouthMostly Clear
2am37°F3°C7 mph11 km/h SouthClear
3am37°F3°C6 mph10 km/h SouthMostly Clear
4am36°F2°C6 mph10 km/h SouthMostly Clear
5am36°F2°C6 mph9 km/h SouthMostly Clear
6am36°F2°C6 mph10 km/h SouthMostly Clear
7am37°F3°C7 mph11 km/h SouthPartly Cloudy
DateLowHighWindDayNight
November 236°F2°C47°F8°C5 mph9 km/h from SouthwestPartly CloudyPartly Cloudy
November 336°F2°C51°F10°C13 mph22 km/h from SouthwestRainDrizzle
November 438°F3°C49°F10°C12 mph19 km/h from WestMostly ClearMostly Cloudy
November 537°F3°C46°F8°C5 mph8 km/h from SouthRainDrizzle
November 629°F-2°C42°F5°C10 mph16 km/h from NorthwestPartly CloudyPartly Cloudy
November 728°F-2°C47°F9°C8 mph13 km/h from SouthRainRain
November 832°F0°C47°F9°C8 mph13 km/h from NorthwestDrizzleRain

Yes

Low of 37°F3°C, High of 51°F11°C
Wind: 13 mph22 km/h
Precipitation: 81% rain

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