CA Sacramento CA Zone Forecast for Saturday, December 16, 2017 _____ 287 FPUS56 KSTO 171000 ZFPSTO Interior Northern California Zone Forecasts for California National Weather Service Sacramento CA 200 AM PST Sun Dec 17 2017 Spot temperatures and probabilities of measurable precipitation are for today, tonight, and Monday. CAZ013-180015- Shasta Lake Area / Northern Shasta County- Including the city of Shasta Dam 200 AM PST Sun Dec 17 2017 .TODAY...Mostly sunny.