But with weather conditions improving, the San Francisco Giants are expecting an on-time first pitch, team spokeswoman Staci Slaughter said.
There is a 30 percent chance of light scattered showers this afternoon and this evening, National Weather Service meteorologist Austin Cross said.
The Giants-Cardinals game is scheduled to begin at 5:07 p.m.
If rain causes a game delay, Slaughter said, "we will wait out as long a possible" in order to finish the game tonight.
The winner of tonight's game between the Giants and the St. Louis Cardinals moves on to the World Series against the American League champions, the Detroit Tigers.
If the game were to begin and is stopped due to rain, it could limit the duration of the outings for starting pitchers Matt Cain and Kyle Lohse, potentially turning the remainder of Game 7 into a matchup of bullpens.
Rain makes headache of morning commute
The deluge of the storm was relentless in the North Bay. Flooding and accidents on 101 slowed traffic to a crawl -- making the Monday morning commute more painful than usual.
"I'm going have to call my boss and tell him I'm going to be late, so hopefully my clients can reschedule. It's nerve-wracking when there's a bunch of traffic," said Nicole Aebischer of Mill Valley.
"I think that at the beginning of the season people always drive a little more, not recklessly, but they're not conscious of what's going on with the slippery roads," said Jeff O'Sammon of Mill Valley.
Commuter Patrick Connolly put-off the headache until later this morning, but he finally decided to take the inevitable in stride.
"Yeah, rain's always a pain in San Francisco, especially first rains of the year. People just don't drive well here so, I don't know. I'm getting a late start. I figure it's going to be bedlam out there," said Connolly.
In San Mateo, a clogged storm drain forced lane closures on Interstate 280 at Highway 92, bringing traffic to a crawl.
In the East Bay, traffic is moving without any problem on the Interstate 880 and 980 junction following overnight flooding. Caltrans crews responded to the scene just after three this morning. Rain left three feet of standing water on the roadway in both directions. That forced the closure of some lanes. However, Caltrans cleared the scene just before 4:30 a.m..
In the Sierra, the first significant snow is falling -- with up to 18 inches expected at higher elevations.
Caltrans has chain controls in effect starting at Baxter across Donner Summit to Truckee. Highway 50 to South Lake Tahoe also has chain controls starting at Twin Bridges over Echo Summit to Meyers. Chains are not required for four-wheel drive vehicles with snow tires for either route. But, conditions do change, so carry chains if you are heading into the mountains.
Bay City News contributed to this report