Monday's weather forecast is sure to get a chilly reception in Calgary, with Environment Canada projecting single-digit temperatures and a chance of rain turning to snow in southern Alberta.

The mercury is expected to plummet from a balmy high of 25 Celsius on Sunday down to a predicted high of just 2 Celsius on Monday. The sudden plunge is due to a cold Arctic air mass blowing through the region, Environment Canada says.

The weather watchdog issued a special weather statement Sunday warning of the possible first snowfall of the season.

"Summer will remain for one more day in Southern Alberta before an intense cold front moves through," the statement said.

That cold front could bring up to five centimetres of snow to Calgary and the surrounding area.

Temperatures will remain in the single-digit range until Thursday, according to Environment Canada forecasts.

The average daily high in Calgary for this time of year is 19 Celsius.

It's been a short summer season in Calgary. Earlier this week, drivers southwest of the city ran into a stretch of highway blanketed by overnight snow. The snow melted partway through the day.

Calgary also dealt with a late-season snowstorm last May, when 20 centimetres fell on the city in a 24-hour period.