With a population of around 22,700, Rosemont sits in California, United States. The city operates in the Pacific Time Zone.
In 2025, Rosemont recorded an average annual temperature of 62°F — about 1.4°F below the 30-year normal of 63°F. The hottest day reached 106°F in August; the coldest was 30°F in January. Total precipitation was 29 inches (wetter than usual). The wettest month was February.
View current conditions and forecast for Rosemont · More cities in California