In the sonnet, the speaker compares his beloved to the summer season, and argues that his beloved is better. He also states that his beloved will live on forever through the words of the poem. Scholars have found parallels within the poem to Ovid's Tristia and Amores, both of which have love themes. Sonnet 18 is written in the typical Shakespearean sonnet form, having 14 lines of iambic pentameter ending in a rhymed couplet. Detailed exegeses have revealed several double meanings within the poem, giving it a greater depth of interpretation.