There are still a few weeks left of summer calendar-wise but the temperatures in southern Saskatchewan are about to switch to fall-like conditions in a hurry.

This week, Environment Canada is expecting daytime highs to top out at the mid-20s C and overnight lows hovering below 10 degrees.

Environment and Climate Change Canada Meteorologist Terri Lang said the cooler air entering the area will be sweeping down from the north.

Lang believes that even though temperatures are creeping toward the freezing mark, there shouldn't be any widespread frost overnight just yet.

"When we're looking for a widespread frost, we're looking for a big area of high pressure that moves down from the north that allows for clear skies in the overnight period," she said. "We're not seeing that, we're seeing certainly some cooler temperatures, but we're seeing a lot of systems moving through. And what that does is there's cloud associated with it, which in the overnight period, tends to act like a little blanket and winds that come with that. Which kind of stirs the lower atmosphere and makes it harder for the frost to form."

She did point out that there might be some patchy frost in areas she referred to as frost hollows or in lower terrains.

While the cool weather is welcomed by many, especially after the record-setting heats we saw earlier this month, the risk of frost could prove to be a burden to some farmers who have late crops and haven't been able to start harvest on them.

"It'll slow us down a bit," explained Dale Paslawski, a farmer in southern Saskatchewan who is around half-way through harvest. "Sometimes we back off a little bit and wait for the moisture to come off our crop so we can put it through our combines."

With the cooler weather, more condensation can be expected in the mornings. But although widespread frost isn't expected, it is important to remember that doesn't mean there can't be frost patches.

"We have some later flax that is still green, so if it does freeze it could become damaged," Paslawski added. "But it can actually take minus one or minus two degrees for about an hour."

He says his concern is largely with farmers that have late canola, as an untimely frost could affect the green seed and impact their harvest significantly.