Dreams can have very unique weather. It may be sunny and thundering, or pouring rain everywhere except for where you are standing. Weather images in dreams often reflect your feelings about your environment. You may view the world as contrary to your goals; thus a dream would have bad weather in it. On the contrary, pleasant dreams or dreams at a time when life is going well usually feature good weather. The weather in dreams is generally not as significant as other images unless it is somehow aberrant from normal, waking world weather.
Did the weather in your dream prevent something good from happening, such as a planned event?