Is that rain in San Francisco this morning? Sure, and one spot measured 0.05 inch

A trough of low-pressure was spread across the San Francisco Bay Area on Wednesday morning, delivering heavy drizzle to many locations, the National Weather Service said.

A weather gauge in San Francisco’s Sunset District had measured 0.05 inches of rain as of 7:30 am on Wednesday. A gauge near Dolores Park picked up 0.01 inches.

The weather service’s downtown San Francisco gauge measured 0.01 inches. Is that a record? Not quite. In 2011, the gauge hit 0.03 inches on July 13. This record could be broken later this morning, said Dalton Behringer, a forecaster with the weather service’s Monterey office.

Up to 0.01 inches fell across the East Bay hills. Half Moon Bay has seen the highest amount of precipitation so far with 0.06 inches.

Behringer said residents in the Santa Cruz Mountains reported rain in their gutters to the weather service.

“It’s a light summer rain,” Behringer said. “I wouldn’t say it’s entirely unusual, especially in coastal locations.”

Behringer said the low-pressure system pushed into Northern California from the Pacific Northwest and it’s competing with a ridge of high pressure over the Great Basin.

“There’s a battle between a ridge of high pressure over the Great Basin and a trough out over the Pacific Northwest, and that trough is currently keeping us under that cool onshore flow,” he explained. “As we move into the weekend, some of the guidance is hinting at the ridge winning and warming up.”

Temperatures will start to climb Thursday with Saturday expected to be the hottest day of the week. On Saturday, afternoon highs are forecast to be in the 90s in inland locations and the 70s along the coast.