Dreaming about the weather, and especially rain, is very common, though it obviously has slightly different implications depending on which part of the world you live in.
For example, the UK has quite a lot of moderate rainfall which makes the countryside very green. Rain is pretty much part of everyday life. In other parts of the world, like hotter areas of the Middle East and desert lands, rain is a rare occurrence and something of a blessing when it arrives. On the other hand, in the Philippines and Southern China the monsoon season is a long period of very heavy rain that often caused devastating floods. The point being, when considering the below meanings of rain in dreams one should also consider one’s own feelings towards rain.
Aside from the above extremes, rain is essential to nature, all life in fact. As humans, we can go weeks without food, but we can only last a few days maximum without water. However, rain is more often considered the life bringer to plants, flowers, crops and trees. Rain is also a cleanser, washing away dust and dirt. Some people often think of rain as cleansing their sins! Certainly water in dreams is connected to spirituality, it is the substance from which we are born.
Dreaming of rain can be a sign of cleansing the spirit, new beginnings and a fresh outlook.
However, if you are caught in a very heavy downpour, or even a monsoon, with floods, the dreams can signify being overwhelmed and feelings helplessness.