The meaning of Fog / foghorn in dream | Dream interpretation
To dream that you are in a ihick mist or fog means that your way in life will often seem dark and perplexing. But, by perseverance and by applying yourself to your own self-development, you will come out of the dark into the light.
To be completely lost in a fog means you are frustrated, not knowing what decision to make.
To hear a foghorn means that there are troubled times coming.