Yes

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

Why? Because jack frost is nipping at your nose!
29°F-2°C & Mostly Clear

Wind is 6 mph9 km/h from the NW, gusting to 15 mph24 km/h
March 29
4am29°F-2°C7 mph10 km/h NWMostly Clear
5am28°F-2°C6 mph10 km/h NWClear
6am28°F-2°C6 mph10 km/h NWClear
7am27°F-3°C6 mph9 km/h NWMostly Clear
8am28°F-2°C6 mph9 km/h NWMostly Clear
9am31°F-1°C7 mph12 km/h NWMostly Clear
10am33°F1°C10 mph15 km/h NWPartly Cloudy
11am36°F2°C11 mph18 km/h WPartly Cloudy
12pm38°F3°C13 mph20 km/h WMostly Cloudy
1pm40°F4°C13 mph21 km/h WMostly Cloudy
2pm40°F5°C14 mph23 km/h WCloudy
3pm41°F5°C14 mph23 km/h NWMostly Cloudy
DateLowHighWindDayNight
March 2927°F-3°C41°F5°C12 mph19 km/h from NWPartly CloudyMostly Clear
March 3026°F-3°C44°F6°C4 mph7 km/h from SEDrizzleFreezingdrizzle
March 3130°F-1°C46°F8°C6 mph9 km/h from WCloudyCloudy
April 132°F-0°C49°F9°C10 mph15 km/h from NEMostly CloudyRain
April 236°F2°C44°F7°C14 mph22 km/h from ERainRain
April 333°F1°C38°F3°C15 mph24 km/h from NSnowSnow
April 430°F-1°C42°F5°C16 mph26 km/h from NWWindyMostly Clear

Yes

Low of 26°F-4°C, High of 44°F7°C
Wind: 4 mph7 km/h
Precipitation: 30% rain

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