Western Australia has had its warmest September on record, with mean temperatures 2.3ºC above average.

The state's mean maximum temperature was 2.73 ºC above average, which was the third-highest on record, while the mean minimum temperature was 1.87ºC above average, the highest on record for September.

"It wasn't hoodie weather, that's for sure."

That's the non-technical September weather summary from Matt Poynton, a West Australian dad living in Bunbury.

Poynton used to work winters in Victoria's snowfields and still flies over once each year but was unable to do so this year due to Covid. Instead, he and his young family took a road trip to Esperance and WA's Great Southern region.

Their trip was met with unusually mild weather in August, when the state's mean maximum was 2.1ºC above average. And once the Poyntons returned to Bunbury in September, the mild conditions continued.

"The fire pit didn't get any use at all, and there were definitely a few opportunities to get down to the beach after work," Poynton told Weatherzone.

"If you're doing that in the southwest in September, that's a pretty good start to spring."

But it wasn't just the south of the state where temperatures were warmer than normal.

Numerous locations in the Kimberley and Pilbara had their warmest September on record, while Mandora - a 94,000 hectare cattle station on the far west Kimberley coast - reached 40ºC or higher on six days. The previous record was four days.

Back down south, the warm start to spring is about to be rudely interrupted by a cold front approaching from the south-west.

The front will likely cross the South West Land Division on Friday and could even deliver snow to the Stirling Range, about 70 kilometres north of Albany.

Image: A past dusting of snow on Bluff Knoll. Source: Jodie Jones.

The Stirlings receive a very light dusting of snow once or twice a year on average. The highest peak, Bluff Knoll, is 1099m.

Perth will likely have maximums in the teens on both Friday and Saturday before warming up into the new week.