Yes

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

Why? Because you're not freezing, but you’ll definitely start complaining if it lasts much longer!
40°F4°C & Cloudy

Wind is 9 mph14 km/h from the Southwest, gusting to 19 mph30 km/h
November 3
7am39°F4°C9 mph15 km/h SouthwestCloudy
8am40°F4°C10 mph17 km/h SouthwestCloudy
9am40°F4°C11 mph17 km/h SouthwestCloudy
10am41°F5°C12 mph20 km/h SouthwestCloudy
11am42°F5°C12 mph20 km/h SouthwestCloudy
12pm42°F6°C13 mph21 km/h SouthwestCloudy
1pm43°F6°C14 mph23 km/h SouthwestCloudy
2pm43°F6°C15 mph24 km/h SouthwestDrizzle
3pm43°F6°C16 mph26 km/h SouthwestDrizzle
4pm43°F6°C17 mph27 km/h SouthwestDrizzle
5pm43°F6°C17 mph27 km/h SouthwestWindy
6pm45°F7°C18 mph29 km/h SouthwestDrizzle
DateLowHighWindDayNight
November 339°F4°C48°F9°C17 mph27 km/h from SouthwestDrizzlePartly Cloudy
November 439°F4°C51°F10°C13 mph22 km/h from WestPartly CloudyCloudy
November 539°F4°C49°F9°C11 mph18 km/h from WestDrizzleDrizzle
November 634°F1°C43°F6°C8 mph12 km/h from NorthwestMostly CloudyMostly Cloudy
November 735°F1°C52°F11°C12 mph19 km/h from SouthRainDrizzle
November 834°F1°C43°F6°C8 mph13 km/h from NorthwestMostly CloudyDrizzle
November 932°F0°C38°F3°C13 mph22 km/h from NorthSnowMostly Cloudy

Yes

Low of 39°F4°C, High of 51°F11°C
Wind: 13 mph22 km/h
Precipitation: None

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