Area Forecast5-day Forecast Grass ValleyTodayPartly CloudyHigh:70Low:49ThursdayClearHigh:76Low:47FridayPartly CloudyHigh:77Low:48SaturdayPartly CloudyHigh:74Low:47SundayPartly CloudyHigh:74Low:47MotherlodeToday: Partly cloudy and very nice. Highs: 71 to 76. Tonight: Mostly clear. Lows: 48 to 53.Tomorrow: Mild and breezy. Highs: 67 to 72.Sacramento RegionToday: Warm and mostly sunny. Highs: 81 to 86.Tonight: Partly cloudy. Lows: 53 to 58.Tomorrow: A little cooler. Highs: 75 to 80.Sierra NevadaToday: Isolated thunderstorms. Highs: 62 to 67. Tonight: Partly to mostly cloudy. Lows: 38 to 43.Tomorrow: Cooler and partly cloudy. Highs: 57 to 62.Bay AreaToday: Patchy fog. Highs: 62 to 67.Tonight: Partly cloudy. Lows: 49 to 54.Tomorrow: Partly to mostly cloudy. Highs: 56 to 61.ALMANACGrass ValleyAvg. …