Yes

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

Why? Because it's cool enough your breath is visible, but your nose isn’t red yet and it's so gusty, you’re basically doing accidental parkour!
48°F9°C & Clear

Wind is 8 mph13 km/h from the Northeast, gusting to 20 mph32 km/h
September 20
6am47°F8°C8 mph13 km/h NortheastClear
7am46°F8°C8 mph12 km/h NortheastClear
8am48°F9°C9 mph14 km/h NortheastClear
9am52°F11°C10 mph16 km/h EastMostly Clear
10am56°F13°C11 mph18 km/h EastMostly Clear
11am59°F15°C11 mph18 km/h EastClear
12pm62°F16°C11 mph18 km/h EastClear
1pm63°F17°C11 mph18 km/h EastClear
2pm65°F18°C11 mph18 km/h EastClear
3pm66°F19°C11 mph18 km/h EastClear
4pm66°F19°C11 mph18 km/h EastClear
5pm66°F19°C11 mph17 km/h EastClear
DateLowHighWindDayNight
September 2046°F8°C66°F19°C10 mph17 km/h from EastClearPartly Cloudy
September 2154°F12°C73°F23°C9 mph14 km/h from EastPartly CloudyDrizzle
September 2265°F18°C75°F24°C9 mph14 km/h from SouthwestDrizzleDrizzle
September 2363°F17°C73°F23°C4 mph6 km/h from WestRainDrizzle
September 2460°F15°C70°F21°C8 mph13 km/h from NortheastPartly CloudyPartly Cloudy
September 2557°F14°C68°F20°C9 mph15 km/h from EastDrizzleRain
September 2660°F15°C71°F22°C6 mph10 km/h from SouthwestDrizzleMostly Clear

Yes

Low of 55°F13°C, High of 73°F23°C
Wind: 9 mph14 km/h
Precipitation: 12% rain

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