An early-season storm is expected to dump up to 1.5 inches of rain on Stockton starting Monday, with up to a 20% chance of thunderstorms, the National Weather Service in Sacramento predicts.
The soaker could last into Tuesday night.
A last-minute forecast Sunday downgraded the precipitation prediction slightly, by about half an inch.
Showers are expected to begin between 2 and 3 p.m. Monday, along with a light 6- to 9-mph breeze. If thunderstorms materialize, they most likely will occur in the evening.
The rain is expected to continue throughout Tuesday, with chances of showers still 30% into the evening.
Temperatures will hover in the mid-60s Monday before dipping into the low 50s Monday night.
Since Oct. 1, the start of the water year, Stockton has already received 0.41 inches of rain, the NWS says.
In San Joaquin County, one of the top-producing agricultural centers of the state, every drop counts. A strong start to the rainy season is good news to farmers.
Outside the San Joaquin Valley, the storm will be cold enough to bring significant snow to the Sierra. The weather service says 1 to 3 feet of snow could drop at elevations above 5,500 feet, with winds up to 35 mph.