Yes

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

Why? Because you're not freezing, but you’ll definitely start complaining if it lasts much longer!
41°F5°C & Clear

Wind is 6 mph10 km/h from the North, gusting to 15 mph24 km/h
October 16
5am41°F5°C6 mph10 km/h NorthClear
6am39°F4°C6 mph9 km/h NorthMostly Clear
7am39°F4°C6 mph10 km/h NorthMostly Clear
8am38°F3°C6 mph10 km/h NorthMostly Clear
9am37°F3°C6 mph10 km/h NorthwestMostly Clear
10am37°F3°C6 mph10 km/h NorthMostly Clear
11am36°F2°C6 mph10 km/h NorthwestMostly Clear
12pm38°F3°C6 mph10 km/h NorthClear
1pm42°F5°C7 mph11 km/h NorthClear
2pm46°F8°C8 mph13 km/h NorthClear
3pm49°F10°C8 mph13 km/h NorthClear
4pm53°F12°C9 mph14 km/h NorthClear
DateLowHighWindDayNight
October 1636°F2°C59°F15°C8 mph13 km/h from NorthMostly ClearPartly Cloudy
October 1738°F3°C55°F13°C3 mph6 km/h from NorthwestMostly CloudyCloudy
October 1848°F9°C63°F17°C9 mph14 km/h from SouthMostly CloudyRain
October 1956°F13°C67°F19°C15 mph24 km/h from SouthRainRain
October 2052°F11°C58°F15°C13 mph21 km/h from WestRainPartly Cloudy
October 2149°F9°C62°F17°C10 mph16 km/h from SouthDrizzleDrizzle
October 2246°F8°C54°F12°C12 mph19 km/h from WestDrizzleMostly Clear

Yes

Low of 38°F4°C, High of 55°F13°C
Wind: 3 mph6 km/h
Precipitation: None

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