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 2010-09-02 17:00:00

	19°C Sunny
		Feels Like		Wind	NE 9 km/h
		Humidity	31 %	Pressure	102.4 kPa falling
		Dew Point	1.8°C	Visibility	64.4 km
		Air Quality		Temperature	19.2°C

Short Term Forecast

	Thursday Night	Friday	Friday Night	Saturday	Sunday
	A Few Clouds	Sunny With Cloudy Periods	Clear	A Mix Of Sun And Cloud	A Mix Of Sun And Cloud
Low	6&°C		10°C		8&°C
High		23°C		20°C	11°C

Detailed Calgary Weather Forecast

Thursday Night	A few clouds. Low 6. Forecast issued 4:00 PM MDT Thursday 02 September 2010
Friday	Sunny with cloudy periods. High 23. UV index 5 or moderate. Forecast issued 4:00 PM MDT Thursday 02 September 2010
Friday Night	Clear. Low 10. Forecast issued 4:00 PM MDT Thursday 02 September 2010
Saturday	A mix of sun and cloud. High 20. Forecast issued 4:00 PM MDT Thursday 02 September 2010
Sunday	A mix of sun and cloud. Low 8. High 11. Forecast issued 4:00 PM MDT Thursday 02 September 2010
Monday	A mix of sun and cloud. Low plus 4. High 12. Forecast issued 4:00 PM MDT Thursday 02 September 2010
Tuesday	A mix of sun and cloud. Low plus 5. High 15. Forecast issued 4:00 PM MDT Thursday 02 September 2010
Wednesday	A mix of sun and cloud. Low 6. High 15. Forecast issued 4:00 PM MDT Thursday 02 September 2010