The poem begins with an apt personification of a stormy night which serves as the backdrop to the speaker's own disquieting thoughts ("The rain set early in tonight, / The sullen wind was soon awake, / It tore the elm-tops down for spite, / And did its worst to vex the lake"). This effectively sets the mood as the poem's unnamed lover is anxiously waiting for Porphyria to join him inside a cottage ("I listened with heart fit to break"). When she finally arrives, Porphyria makes things well inside the cottage in contrast to the harsh conditions outside ("When glided in Porphyria; straight / She shut the cold out and the storm, / And kneeled and made the cheerless grate / Blaze up, and all the cottage warm"). Porphyria's loving presence stands in contrast to the cold weather conditions and, as we will later learn, to the cold calculations of her lover.
According to how she is next described after bringing warmth to the cottage, it would appear Porphyria is an upper class lady of the nineteenth century ("Which done, she rose, and from her form / Withdrew the dripping cloak and shawl, / And laid her soiled gloves by, untied / Her hat and let the damp hair fall"). She is likely married and has dashed away from a "gay feast" to meet her brooding lover in a tryst wherein she initiates the lovemaking ("And, last, she sat down by my side