In William Shakespeare’s Sonnet 18, what does the speaker compare the beloved to?

In Shakespeare’s Sonnet 18, the speaker compares the beloved to a summer’s day.

The poem begins with the famous question, “Shall I compare thee to a summer’s day?” It then argues that the beloved is more lovely and more temperate than summer. Summer can be too short, too hot, or roughened by winds, while the beloved’s beauty is presented as more enduring.

The sonnet’s central claim is that poetry can preserve beauty. The speaker says the beloved’s “eternal summer” will not fade because the poem itself will continue to live and give life to the beloved’s beauty. The closing couplet links that endurance to readers who see and read the verse.

Sonnet 18 is part of Shakespeare’s 154-sonnet sequence, first published in 1609. The poem’s beloved is not identified by name, and scholars debate the sequence’s biographical implications. The comparison, however, is explicit: the opening image is a summer’s day.