Yes

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

Why? Because the cold's there, but it's just a reminder, not an invasion!
43°F6°C & Mostly Cloudy

Wind is 6 mph10 km/h from the Northwest, gusting to 12 mph20 km/h
October 24
11pm42°F6°C4 mph7 km/h NorthwestPartly Cloudy
October 25
12am41°F5°C5 mph9 km/h WestMostly Cloudy
1am40°F5°C4 mph7 km/h WestMostly Cloudy
2am40°F4°C4 mph6 km/h NorthwestMostly Cloudy
3am39°F4°C4 mph6 km/h WestMostly Cloudy
4am38°F3°C4 mph6 km/h WestPartly Cloudy
5am37°F3°C4 mph6 km/h WestPartly Cloudy
6am37°F3°C4 mph6 km/h WestPartly Cloudy
7am37°F3°C4 mph6 km/h WestMostly Cloudy
8am37°F3°C3 mph5 km/h WestMostly Cloudy
9am36°F2°C3 mph5 km/h WestMostly Cloudy
10am36°F2°C4 mph6 km/h WestMostly Cloudy
DateLowHighWindDayNight
October 2438°F3°C48°F9°C8 mph12 km/h from NorthwestMostly CloudyMostly Cloudy
October 2536°F2°C50°F10°C5 mph7 km/h from NorthwestMostly CloudyMostly Clear
October 2631°F-1°C48°F9°C6 mph9 km/h from NortheastMostly ClearMostly Clear
October 2731°F-1°C46°F8°C10 mph17 km/h from EastPartly CloudyPartly Cloudy
October 2836°F2°C48°F9°C12 mph19 km/h from EastMostly CloudyMostly Cloudy
October 2936°F2°C49°F9°C9 mph14 km/h from NortheastPartly CloudyPartly Cloudy
October 3037°F3°C47°F8°C8 mph12 km/h from NorthRainPartly Cloudy

Yes

Low of 36°F2°C, High of 50°F10°C
Wind: 5 mph7 km/h
Precipitation: None

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