Grass Valley is a city of approximately 12,900 people in California, United States. Located in the Pacific Time Zone at 39.2°N latitude.
In 2025, Grass Valley recorded an average annual temperature of 59°F — about 6.9°F above the 30-year normal of 52°F. The hottest day reached 98°F in September; the coldest was 25°F in February. Total precipitation was 52 inches (drier than usual). The wettest month was February.
View current conditions and forecast for Grass Valley · More cities in California