Thornton is a city of approximately 1,100 people in California, United States. Located in the Pacific Time Zone at 38.2°N latitude.
In 2025, Thornton recorded an average annual temperature of 61°F — about 2.3°F below the 30-year normal of 63°F. The hottest day reached 102°F in September; the coldest was 29°F in January. Total precipitation was 24 inches (wetter than usual). The wettest month was February.
View current conditions and forecast for Thornton · More cities in California