Clarissa Dalloway, the heroine of the novel, struggles constantly to balance her internal life with the external world. Her world consists of glittering surfaces, such as fine fashion, parties, and high society, but as she moves through that world she probes beneath those surfaces in search of deeper meaning. Yearning for privacy, Clarissa has a tendency toward introspection that gives her a profound capacity for emotion, which many other characters lack. However, she is always concerned with appearances and keeps herself tightly composed, seldom sharing her feelings with anyone. She uses a constant stream of convivial chatter and activity to keep her soul locked safely away, which can make her seem shallow even to those who know her well.

Constantly overlaying the past and the present, Clarissa strives to reconcile herself to life despite her potent memories. For most of the novel she considers aging and death with trepidation, even as she performs life-affirming actions, such as buying flowers. Though content, Clarissa never lets go of the doubt she feels about the decisions that have shaped her life, particularly her decision to marry Richard instead of Peter Walsh. She understands that life with Peter would have been difficult, but at the same time she is uneasily aware that she sacrificed passion for the security and tranquility of an upper-class life. At times she wishes for a chance to live life over again. She experiences a moment of clarity and peace when she watches her old neighbor through her window, and by the end of the day she has come to terms with the possibility of death. Like Septimus, Clarissa feels keenly the oppressive forces in life, and she accepts that the life she has is all she’ll get. Her will to endure, however, prevails.