Rain Forecast. Map on the left shows precipitation amounts for interior northern California. Amounts range from 0.25 to 1 inches in the Valley and from 0.50 to 2.5 inches across foothills and mountains. Impacts: Minor. Longer than normal travel time and ponding of water on roadways. Thunderstorms. Snow levels: 5500–6500 ft Saturday evening, lowering to 3500–4500 ft Sunday. Timing: Late this afternoon – Sunday, February 4-5, 2023.