Seeing fog in your dream symbolizes ambiguity, confusion, and uncertainty. This dream may carry important messages about various aspects of your life. Understanding the nature of the fog and connecting it to your current circumstances can help you interpret its meaning. The significance of this dream may relate to your present situation and future goals.
From Imam Muhammad Ibn Seerin's Dictionary of Dreams According to Islamic Inner Traditions â entry "Fog" (page 173).
Fog in a dream means going on a journey or returning from one. Fog in a dream also means confusion or obscurity about a material or a spiritual matter. If one sees himself walking through fog in a dream, it means that he is intending something despised by God Almighty and he should desist from it. Fog in a dream also means ambiguity, dubiousness, tangle or doubt. Fog in a dream also means trials or a fight between people. (Also see Clouds)
Note: Islamic dream interpretation depends on the dreamer's circumstances and state. This is a general guide drawn directly from the source book.