An unseasonable warm spell this week will let people shed their winter layers – but don’t put those big coats away just yet, the summer-like weather is expected to be gone by the weekend.

Still, inland Orange County could see record-breaking temps by Thursday, when areas such as Anaheim are expected to reach mid-to-upper 80s, said National Weather Service meteorologist Sebastian Westerink.

Already on Tuesday, an area of high pressure was causing weather to warm up to the mid-80s in the Inland Empire, he said. Temperatures on Wednesday are expected to be similar, before spiking even higher Thursday.

Though Monday was blue skies.along much of the coastline, a thick marine layer hovered through the afternoon Tuesday.

That fog layer is caused by the warm air overhead constricting colder air below, not allowing the moisture to burn off.

“It’s a very stubborn, widespread coverage area of fog contained by the warm air above pressing down on it,” Westerink said.

A weak Santa Ana wind on Thursday should keep that marine layer offshore, he added, allowing temps to increase at the coast to the low-to-mid 70s.

That day, temps will be 15-to-20 degrees above average. The record high for Anaheim is 87 degrees, and temperatures could come close to breaking that record, Westerink said.

Cooler weather is expected ahead for the weekend, and there’s even a chance for rain.

Right now, two different models are conflicting, so it’s hard to say with certainty if Southern California will receive a needed soak, Westerink said. “Warm weather will be gone, and whether we will see just a drop in temperature or showery rainy weather is unclear.”

There could be a chance for snow at local mountains at the tail end of that storm, he added.