What’s this? Bay Area could see rain for first time in nearly six months

A couple watches the waves at Lands End in San Francisco, Calif. Monday, Jan. 29, 2018. Bay Area weather forecast suggests that little rain is in the near future and February to be the warmest on record. A couple watches the waves at Lands End in San Francisco, Calif. Monday, Jan. 29, 2018. Bay Area weather forecast suggests that little rain is in the near future and February to be the warmest on record. Photo: Mason Trinca / Special To The Chronicle Photo: Mason Trinca / Special To The Chronicle Image 1 of / 32 Caption Close What’s this? Bay Area could see rain for first time in nearly six months 1 / 32 Back to Gallery

Nearly six months have passed since the Bay Area saw rain.

That may change this weekend with a new weather pattern sweeping through the region to bring cooler temperatures and some light rainfall to the North Bay and East Bay, forecasters said.

“This is definitely the time of year we are starting to transition from our dry season,” said Roger Gass, a meteorologist with the National Weather Service.

“October, November is when we start to transition into that weather pattern,” he added.

The most notable changes this weekend are expected to be felt at the higher elevations and the inland areas.

Starting Friday, temperatures in inland areas, including Livermore, Concord and parts of the Napa and Sonoma valleys, will drop by about 10 degrees. Most of those areas will barely reach 70 degrees compared to the 80- and 90-degree temperatures from earlier this week.

The North Bay could receive some light rainfall starting Saturday and the inland areas are expected to receive a dousing of precipitation by Monday, Gass said.

“Right now, there is a lot of uncertainty because things change that far out, especially this time of year,” he said. “Nonetheless, it does look like sometime Monday into Tuesday, we may have that next system come into the California coast and result in more widespread rainfall.”

Meanwhile, the changing weather pattern won’t have much impact on San Francisco or Oakland.

Temperatures in the two cities will likely remain in the lower 60s throughout the weekend.

Because of “the proximity to the bay, (San Francisco and Oakland) are not going to see that drastic change,” Gass said.

Sarah Ravani is a San Francisco Chronicle staff writer. Email: sravani@sfchronicle.com Twitter: @SarRavani