The mercury in thermometers will be on the rise this week in southwestern Saskatchewan as a heatwave is set to roll in.

Starting today and stretching to Sunday daytimes are expected to reach the low to mid-30s C, with overnight lows not dropping below 14 C.

Dan Kulak, a meteorologist from Environment and Climate Change Canada, said the balmy weather pattern was created in the atmosphere above the United States.

"The heat is basically at this time of the year is an extension of all the heat that occurs in the southern US," he said Monday afternoon. "We get into the really strong temperatures in the summertime in the US deserts and that heat gradually works its way northwards and the peak time of the year for that heat to make its way to the southern prairies is usually late July and the first part of August."

Its been a cooler July than normal and when comparing July 2019's (24.8 C) daytime high to the current July (23.3 C), it's a 1.5 C difference.

"It's generally been coolish and showeryish and kind of not what people expect," the Edmonton-based meteorologist said. "Certainly there has been some warm days and some heat involved in the summer so far in much of southern Saskatchewan, but this is the first real push of very warm air from the US into southern Saskatchewan."

According to Environment Canada data, only one day this month has been above 28.2 C and that was on July 22 when it reached 31.2 C.

Kulac also noted with the warmer weather people need to pay extra attention to children, seniors, and pets as it only takes a matter of moments for them to face life-threatening situations, especially if they are left in the car in sunlight.