weather in valley center, california fahrenheit
California Weather > Valley Center Weather. Valley Center, CA climate is warm during summer when temperatures tend to be in the 70's and cool during winter when temperatures tend to be in the 50's. The warmest month of the year is August with an average maximum temperature of 89.10 degrees Fahrenheit, while the coldest month of the year is December with an average minimum temperature of 41.60 degrees Fahrenheit.