When visiting Calgary, be prepared by bringing along clothes to add layers when necessary. You may need a coat, even in the summertime, because the mountain air gets quite chilly in the evenings after the sun goes down.
In contrast, be ready to wear short sleeves in January if the Chinook winds come your way while you’re there. Calgary’s weather is greatly influenced by the city’s close proximity to the Rocky Mountains (just 60 minutes away!); it has cool winters (though mild by Canadian standards) and short, warm summers.

The city is also one of the sunniest in Canada, with 2,405 hours of annual sunshine, on average. Although Calgary's winters can be uncomfortably cold: warm, dry Chinook winds routinely blow into the city from the Pacific Ocean during the winter months, giving Calgarians a break from the cold. 

As a consequence of Calgary's high elevation, summer evenings can be very cool, the average summer minimum temperature is 46°F, and frosts can occur in any month of the year. Calgary has experienced snowfall even in July and August! Unlike cities further east, like Toronto or Montreal, humidity is almost never a factor during the Calgary summer.

Current Calgary Weather

Observed at Calgary Int'l Airport on 2010-03-19 23:00:00

	-1°C Clear
		Feels Like	-5	Wind	SSE 13 km/
		Humidity	62 %	Pressure	102.6 kPa falling
		Dew Point	-7.0°C	Visibility	24.1 km
		Air Quality		Temperature	-0.7°C

Short Term Forecast

	Friday Night	Saturday	Saturday Night	Sunday	Monday
	Clearing	Sunny	A Few Clouds	A Mix Of Sun And Cloud	Chance Of Showers
Low	-2°C		1°C		1°C
High		15°C		13°C	5°C

Detailed Calgary Weather Forecast

Friday Night	Clearing early this evening. Wind becoming west 20 km/h overnight. Low minus 2. Forecast issued 4:00 PM MDT Friday 19 March 2010
Saturday	Sunny. Wind west 20 km/h becoming light in the morning. High 15. UV index 3 or moderate. Forecast issued 4:00 PM MDT Friday 19 March 2010
Saturday Night	Clear. Becoming cloudy periods near midnight. Wind southwest 20 km/h becoming light in the evening. Low plus 1. Forecast issued 4:00 PM MDT Friday 19 March 2010
Sunday	A mix of sun and cloud. High 13. Forecast issued 4:00 PM MDT Friday 19 March 2010
Monday	Cloudy with 40 percent chance of showers. Low plus 1. High plus 5. Forecast issued 4:00 PM MDT Friday 19 March 2010
Tuesday	A mix of sun and cloud. Low minus 3. High 9. Forecast issued 4:00 PM MDT Friday 19 March 2010
Wednesday	A mix of sun and cloud. Low minus 3. High plus 3. Forecast issued 4:00 PM MDT Friday 19 March 2010
Thursday	Cloudy. Low minus 5. High plus 1. Forecast issued 4:00 PM MDT Friday 19 March 2010