A Pacific storm system could bring the first substantial precipitation of the season to the foothills and mountains this week.
Storms associated with the system are expected to bring up to a half inch of rain to the foothills between Tuesday and Wednesday.
Up to 4 inches of snow are forecast above 7,000.
"The first big storm system is coming in right now," Karl Swanberg, National Weather Service forecaster in Sacramento, said today.
Swanberg said lows tonight are predicted in the low- to mid-40s in Sonora and Angels Camp. Daytime highs today will be in the mid-50s.
The overnight low at 7,000 feet - about Lake Alpine and Kennedy Meadows - is expected to be 33 degrees tonight.
Since July 1, only 0.79 inch of rain has fallen in Sonora. The average for this time of year is 3.51 inches.
The dry weather is the result of a ridge of high pressure parked off the coast, deflecting normal fall-winter weather patterns, Swanberg said.
The remainder of the week, clear skies and cooler temperatures are forecast.
The next rain and snow could come Dec. 6, according to Accuweather, a private weather forecasting service.