you do need a jacket based on the weather in Calgary, AB, Canada 2 minutes ago

Why? Because it's cold. simple as that.
46°F8°C & Cloudy

Wind is 2 mph4 km/h from the S, gusting to 7 mph11 km/h
May 25
11am47°F8°C3 mph5 km/h SMostly Cloudy
12pm50°F10°C4 mph7 km/h SECloudy
1pm53°F12°C6 mph9 km/h SEMostly Cloudy
2pm56°F13°C6 mph9 km/h SECloudy
3pm58°F14°C6 mph10 km/h SECloudy
4pm59°F15°C7 mph11 km/h SECloudy
5pm59°F15°C6 mph9 km/h SECloudy
6pm58°F14°C6 mph10 km/h SECloudy
7pm57°F14°C5 mph9 km/h SCloudy
8pm56°F13°C7 mph11 km/h SCloudy
9pm54°F12°C6 mph9 km/h SWDrizzle
10pm51°F11°C5 mph9 km/h NWMostly Cloudy
May 2538°F3°C59°F15°C5 mph8 km/h from SEDrizzleDrizzle
May 2640°F4°C60°F15°C7 mph11 km/h from NWMostly CloudyMostly Clear
May 2740°F4°C68°F20°C6 mph10 km/h from SWPartly CloudyMostly Cloudy
May 2846°F8°C69°F21°C6 mph10 km/h from SMostly CloudyMostly Cloudy
May 2946°F8°C59°F15°C8 mph13 km/h from NWMostly CloudyMostly Cloudy
May 3041°F5°C64°F18°C11 mph17 km/h from NWRainMostly Cloudy
May 3143°F6°C65°F18°C7 mph12 km/h from WPartly CloudyPartly Cloudy


Low of 40°F5°C, High of 60°F16°C
Wind: 7 mph11 km/h
Precipitation: 27% rain

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