This song delves into the idea that our perception shapes our reality, challenging the common tendency to complain about things like the weather. It suggests that what one person sees as "rain" or a negative experience, another might view differently, perhaps even as part of a benign, mind-altering journey. The lyrics explore the importance of mind over matter, a theme that would become more prominent in the band's psychedelic period, presenting the material world as potentially an illusion. At its heart, "Rain" encourages a shift in perspective, finding beauty or acceptance in what might typically be considered undesirable.