Yes, it's happening. California gets snow and rain in June

Pedestrians cross 16th Street under their umbrellas in the rain on Friday, March 24, 2017 in San Francisco, Calif. Pedestrians cross 16th Street under their umbrellas in the rain on Friday, March 24, 2017 in San Francisco, Calif. Photo: Lea Suzuki, The Chronicle Buy photo Photo: Lea Suzuki, The Chronicle Image 1 of / 25 Caption Close Yes, it's happening. California gets snow and rain in June 1 / 25 Back to Gallery

The roads are wet and slick, the windshield wipers are on, and the umbrellas opening up.

Yes, it's actually raining in June.

Downtown San Francisco is expected to receive one-hundredth of an inch to fifteen one-hundredths of an inch. The city will likely see the average rainfall for June, which is sixteen one-hundredths of an inch, in one day.

Urban areas in the North Bay will get up to a quarter of an inch and higher elevations a half-inch.

"The rainy days in June are very limited," said Scott Rowe, a meteorologist with the National Weather Service office in Monterey. "When you do get precipitation in June, it's usually only one or two days."

Rowe warns that because it hasn't rained in the Bay Area since April 19, oil will be built up on roads and motorists could encounter slippery spots during the morning commute. "Traffic could be slow this morning," he said.

What's more, the rainy weather is interfering with many school's end-of-the-year activities such as picnics, beach days, outdoor graduations and special field trips to amusement parks.

In the mountains, snow was falling above 10,000 feet Thursday morning and the snow level will likely rise above 8,000 feet in the afternoon.

"The Sierra Nevada could get some good precipitation, up to an inch," Rowe said. "You have the mountains that lift up the moisture and squeeze it out of the storm front."

The precipitation is the result of a low-pressure system that's coming from the Pacific Northwest and anchored off the coast of British Columbia. The worst of the weather will arrive this afternoon when a trailing cold front drapes over Northern California.

As the storm moves through the region, precipitation is forecast to decrease rapidly into the night. Friday through Sunday will be dry and cool with inland highs in the mid-60s to mid-70s (up to 10 degrees below normal) and coastal highs in the 50s to 60s (two to three degrees below normal).

Things should begin to warm up Monday and through next week, with temperatures reaching as high as the 90s inland by Thursday.