December/January weather in LA/ Beverly hills/ San Francisco

Ruhena • I thank God everyday for my beautiful family ❤️
I am planning on going to LA in mid December for three weeks can anyone tell me what the weather is like. We will be staying in beverly hills most of the holiday and one week in San Francisco. Although we have been to Beverly hills before it was in summer and October. I know we won't feel cold considering we live in London where it is cold and damp most day now but I have heard San Francisco is quite unpredictable. This holiday will be my last holiday before our baby arrives in April God Willing. I don't think I can do a eleven hour journey on the plane later in the pregnancy. My children are looking forward to the nice weather hopefully we won't be disappointed 🙏