The poem is set against a backdrop of bleakness, darkness, and turbulence, creating a haunting atmosphere that mirrors the struggles and derangement of the narrator. The poem opens with a vivid description of a stormy night: "The rain set early in to-night, / The sullen wind was soon awake." This imagery immediately establishes a mood of desolation and unrest, with the elements serving as a metaphor for the emotional turmoil brewing within the narrator's mind. The setting of the poem is further characterized by darkness and isolation. The cottage in which the narrator waits for Porphyria is described as "cheerless," with only the "sullen wind" and the "vexed lake" for company. This sense of solitude and desolation enhances the atmosphere of foreboding and unease, foreshadowing the tragic events that will unfold. The darkness of the setting also reflects the moral ambiguity of the narrator's actions. As the storm rages outside, the narrator's obsession with Porphyria grows increasingly intense, leading to a violent and ultimately fatal act. The setting thus serves as a haunting metaphor for the darkness within the narrator's soul.