The National Weather Service said that rain is likely throughout Wednesday and Thursday.
Between a quarter and half an inch of rain is expected on Wednesday, with wind gusts as high as 22 miles per hour expected.
Temperatures overnight are expected to drop into the 30s, the agency predicted, with as much as another inch of rain possible.
The National Weather Service said there is a 60-percent chance of rain on Thanksgiving, with the total expected to be up to a quarter of an inch. Southwest winds up to nine miles per hour during the day also are predicted.
On Thanksgiving night, temperatures are forecast to drop into the high 30s, with a 40-percent chance of showers and west northwest winds at around 9 miles per hours, the National Weather Service reported.
Weather through the rest of the week is expected to be sunny, with some clouds, and daytime temperatures in the 50s and 60s, according to forecasters.
The National Weather Service is predicting a slight chance of rain early next week
Caltrans urges travelers to be prepared for winter storms when traveling, to give themselves extra time to reach destinations during inclement weather, and be equipped with chains, blankets and flashlights, and food and water in case of travel delays.
Current road conditions can be found by calling 800-427-7623 or by visiting www.dot.ca.gov.
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