In a dream, if you see yourself carrying an umbrella, it means you are protecting yourself against the bad luck of getting caught in the rain. Rain water gives life to plants and animals alike. Rain water collected in reservoirs, pools and ponds are essential for animals. The dream imagery of carrying an umbrella means good luck because rain is anticipated. This is similar to what happens in real life.
In waking life, if you carry an umbrella when going outdoors, it means you are taking protection against rain.