Yes

you do need a jacket based on the weather in Ottawa, ON K1T 0L5, Canada 1 second ago

Why? Because it's so windy, even the squirrels are holding onto branches for dear life!
60°F16°C & Cloudy

Wind is 11 mph17 km/h from the Southwest, gusting to 21 mph34 km/h
September 7
11am61°F16°C11 mph18 km/h WestPartly Cloudy
12pm61°F16°C10 mph16 km/h WestMostly Cloudy
1pm62°F17°C12 mph20 km/h WestMostly Cloudy
2pm64°F18°C10 mph15 km/h WestPartly Cloudy
3pm66°F19°C11 mph18 km/h WestMostly Clear
4pm66°F19°C12 mph19 km/h WestMostly Clear
5pm65°F18°C11 mph17 km/h WestMostly Clear
6pm63°F17°C8 mph13 km/h WestMostly Clear
7pm61°F16°C6 mph10 km/h WestMostly Clear
8pm58°F14°C5 mph9 km/h WestMostly Clear
9pm55°F13°C6 mph10 km/h WestMostly Clear
10pm54°F12°C6 mph10 km/h WestMostly Clear
DateLowHighWindDayNight
September 751°F11°C66°F19°C9 mph14 km/h from WestPartly CloudyClear
September 846°F8°C66°F19°C6 mph9 km/h from WestMostly ClearClear
September 945°F7°C71°F22°C5 mph7 km/h from SouthMostly ClearClear
September 1048°F9°C76°F24°C4 mph6 km/h from SouthPartly CloudyPartly Cloudy
September 1152°F11°C70°F21°C9 mph14 km/h from NorthMostly ClearClear
September 1245°F7°C67°F20°C4 mph6 km/h from NorthMostly ClearPartly Cloudy
September 1346°F8°C70°F21°C4 mph7 km/h from SouthMostly CloudyPartly Cloudy

Yes

Low of 46°F8°C, High of 66°F19°C
Wind: 6 mph9 km/h
Precipitation: None

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