This week may mark the first time the heating is switched on in many households across Wales, as Hurricane Lorenzo threatens to send the mercury plummeting.
The Category-2 system is currently heading toward the Azores before it's expected to cross the Atlantic on its way to the United Kingdom.
While the jury is out on where exactly the storm will track, meteorologists say the United Kingdom should brace for more heavy rain, gale-force winds and a surge of chilly air toward the end of the week.
Met Office spokeswoman Nicola Maxey said: "There's huge discrepancy in what the models expect the storm to do.
"Some models take it far to the north of the UK, another takes it across the South West, and then there's some that have it crossing the north of England and Scotland," she said.
Though it's unclear where the strongest winds and heaviest rain will occur, current forecasts are calling for wet and windy weather late on Thursday into Friday across Wales.
Nicola said: "By the time it reaches us, it will be an ex-tropical storm. It will slow down and wind speeds will reduce.
"It certainly won't be a hurricane."
However, gale force winds are likely with gusts expected to near 50mph at times.
And with the stormy conditions, temperatures will drop to some of the lowest readings seen since last winter across Wales.
"We're going to see some cooler air coming in from the north, so we're likely to see below-average temperatures," Nicola said.
"Wednesday night and Thursday night we could see some rural grass frost or even some air frost."
North Wales is the most likely location for this, with single digit temperatures in the forecast.
For many households, the air will be chilly enough to switch on the heating for the first time this season.
Though autumn only officially kicked off last week, the cold air could usher in the season's first snowfall for some parts of the UK.
"Because of this cold air coming in, there is a chance that you might see some snow on the highest tops of mountains in northern Scotland.
"But you'll certainly not be seeing snow drifts in Aberystwyth or snow in Cardiff, and I doubt you'd see anything at the top of Snowdon either."
However, "it is certainly looking possible for Scotland," she said.
