The speaker wants to be washed clean. Others assume they are happy, "friends with the sun," but the speaker says the opposite: what they really long for is a storm. Rain, wind and dark clouds become a way of imagining relief from a darkness inside them. The rain runs down their body to wash it out, the wind carries them far from other people, and the clouds block out the light so that this cleansing can happen privately.
There is an ache in the wish "to be normal just like everyone else," which suggests the speaker feels set apart. The last stanza shifts the mood. After the storm comes a rainbow, and with it hope and the chance "to live life again." The poem begins in loneliness and hidden pain, but it ends gently, with the idea that suffering might be a passage toward a fresh start rather than the end of the story.