If the rain is a gentle one, and especially if rainbows are present, this is a positive symbol, foreshadowing the coming of a peaceful interlude and much happiness.
If the rain is heavy, this indicates a change in the dreamer’s financial fortunes. Depending on his circumstances, it could be a windfall or a major setback.
A major thunderstorm with thunder and lightning indicates a sudden and unexpected increase in wealth, possibly through a legacy.
Astrological parallel: Venus Tarot parallel: The Wheel of Fortune