While the San Francisco Bay Area has seen a handful of potent storms this winter, weak systems, the sort that merely wet sidewalks, have been more common.

This weekend, yet another one of these drizzly systems is headed for the region.

The storm, if you want to even call it that, will arrive Saturday night, delivering the first drops in the North Bay and gradually spreading south. By Sunday morning, conditions will dry up with most of the rain falling overnight.

"I don’t think it’s going to be much of a big deal," said Suzanne Sims, a forecaster with the National Weather Service office in Monterey. "We’re grasping at straws here. The bulk of the rain will fall in the North Bay with amounts of three quarters of an inch or less. It tapers down to a quarter of an inch or less once it hits the central Bay Area and just a few hundredths as you get down to Monterey."

Ahead of the weekend, Thursday and Friday will be mostly dry and gray with mild temperatures. Afternoon highs are forecast to be in the mid-50s to low-60s. There's a slight chance of rain in the far reaches of the North Bay Thursday night, but areas south of the Golden Gate aren't expected to see any drops.

All of these weak weather systems have given the perception that the region has seen a lot of rain and indeed there have been a lot of rainy days. But in fact, the Bay Area is generally behind in its rainfall totals.

"Normally, since January 1, San Francisco would have seen about 3 inches of rain by this time of year and we've only gotten a little over one inch so we're running behind," said Sims. "There's still plenty of rainy season left so let's not lose hope."

Since the start of the season beginning Oct. 1, 2019, most locations remain under average. The gauge at the Santa Rosa Airport received 15.31 inches since Jan. 16, with the rainfall total being 80 percent of average for this time of year. San Francisco has recorded 8.77 inches and is 73 percent of normal and Oakland has seen only 5.60 inches and is only 53 percent of average.

Amy Graff is a digital editor with SFGATE. Email her weather tips at agraff@sfgate.com.