Yes

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

Why? Because you're not freezing, but you’ll definitely start complaining if it lasts much longer!
46°F8°C & Mostly Clear

Wind is 5 mph8 km/h from the Southwest, gusting to 10 mph16 km/h
March 10
1pm47°F8°C6 mph10 km/h SouthwestClear
2pm49°F10°C8 mph12 km/h SouthwestClear
3pm51°F10°C8 mph13 km/h SouthwestClear
4pm52°F11°C9 mph14 km/h SouthwestClear
5pm51°F11°C9 mph15 km/h SouthwestClear
6pm50°F10°C9 mph14 km/h SouthwestClear
7pm45°F7°C8 mph13 km/h SouthwestClear
8pm43°F6°C8 mph13 km/h SouthwestClear
9pm41°F5°C8 mph14 km/h SouthwestMostly Clear
10pm40°F5°C9 mph14 km/h SouthwestPartly Cloudy
11pm41°F5°C9 mph15 km/h SouthwestPartly Cloudy
March 11
12am40°F5°C9 mph15 km/h SouthwestMostly Clear
DateLowHighWindDayNight
March 1029°F-2°C52°F11°C5 mph9 km/h from SouthwestClearMostly Clear
March 1124°F-5°C45°F7°C13 mph21 km/h from WestPartly CloudyPartly Cloudy
March 1222°F-6°C34°F1°C11 mph18 km/h from EastCloudyMostly Cloudy
March 1325°F-4°C45°F7°C4 mph6 km/h from EastMostly CloudyMostly Cloudy
March 1431°F-1°C55°F13°C7 mph11 km/h from EastMostly CloudyCloudy
March 1544°F7°C61°F16°C15 mph24 km/h from SouthWindyRain
March 1638°F3°C57°F14°C13 mph21 km/h from SouthwestRainMostly Cloudy

Yes

Low of 24°F-5°C, High of 45°F7°C
Wind: 13 mph21 km/h
Precipitation: None

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