Yes

you do need a jacket based on the weather in Toronto, ON, Canada 5 minutes ago

Why? Because the drizzle is not enough rain to call it "raining," but enough to make you a little soggy and you're not freezing, but you’ll definitely start complaining if it lasts much longer!
48°F9°C & Drizzle

Wind is 5 mph8 km/h from the North, gusting to 11 mph17 km/h
May 23
2am48°F9°C5 mph9 km/h NorthDrizzle
3am48°F9°C6 mph10 km/h NorthwestDrizzle
4am48°F9°C7 mph12 km/h NorthwestDrizzle
5am47°F8°C9 mph14 km/h NorthwestRain
6am47°F8°C9 mph15 km/h NorthwestRain
7am46°F8°C9 mph15 km/h NorthwestDrizzle
8am47°F8°C9 mph14 km/h NorthwestDrizzle
9am47°F9°C9 mph14 km/h NorthwestDrizzle
10am48°F9°C9 mph14 km/h WestDrizzle
11am49°F10°C9 mph15 km/h NorthwestDrizzle
12pm51°F10°C9 mph15 km/h NorthwestCloudy
1pm52°F11°C9 mph14 km/h NorthwestCloudy
DateLowHighWindDayNight
May 2346°F8°C53°F12°C9 mph14 km/h from NorthwestDrizzleDrizzle
May 2445°F7°C59°F15°C10 mph16 km/h from NorthwestMostly CloudyPartly Cloudy
May 2546°F8°C61°F16°C8 mph13 km/h from NorthwestMostly CloudyClear
May 2647°F8°C66°F19°C3 mph5 km/h from SouthMostly ClearClear
May 2749°F9°C66°F19°C8 mph12 km/h from EastMostly CloudyMostly Cloudy
May 2851°F10°C61°F16°C9 mph15 km/h from EastDrizzlePartly Cloudy
May 2951°F11°C61°F16°C5 mph9 km/h from SouthDrizzleDrizzle

Yes

Low of 46°F8°C, High of 59°F15°C
Wind: 10 mph16 km/h
Precipitation: 26% rain

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