The song opens with vivid imagery that sets the scene for a day spent together, highlighting the beauty of the moment despite the thunderous weather. This juxtaposition of nature's chaos against the tranquility of their connection symbolizes how love can thrive even in tumultuous circumstances. The narrator's reflections on the girl evoke a sense of nostalgia and warmth, suggesting that their time together is both precious and fleeting. As the lyrics progress, the narrator expresses a profound yearning to be with this person, emphasizing the emotional support and comfort they provide. Phrases that compare the girl's hair to a waterfall illustrate the beauty and fluidity of their relationship, while also conveying a sense of awe and admiration. The chorus reinforces the theme of devotion, with the narrator willing to do anything to ensure the loved one feels valued and cherished. The repetition of the phrase "I'm with you" serves as a mantra, underscoring the importance of presence and companionship in a relationship. The song's bridge introduces a moment of vulnerability, where the narrator confronts uncertainties but ultimately reaffirms their commitment. This emotional depth is further enhanced by the melodic instrumentation, which complements the lyrical content and creates an immersive listening experience. Overall, "I’m with You" captures the essence of romantic love, portraying it as a source of strength and inspiration, while also acknowledging the complexities that come with it.

Released in 2018, "I’m with You" arrived during a time when indie pop was gaining significant traction in the music industry. Vance Joy, known for his storytelling and emotive songwriting, tapped into universal themes of love and connection that resonate with audiences across generations. The song's release coincided with a growing appreciation for authenticity in music, as listeners sought out artists who conveyed genuine emotions and experiences. The backdrop of Australian culture, with its stunning landscapes and laid-back lifestyle, adds an additional layer of relatability to the song, inviting listeners to envision their own moments of intimacy and connection.