The speaker wakes up every day determined to be a "ray of sunshine," and the poem lists the small kindnesses that follow: carrying groceries for an elderly woman, guiding a blind man, helping a friend, reuniting a lost child with his parents. The people he helps barely respond, just a quiet "thanks." He doesn't ask for more, yet he quietly hopes someone might one day help him without being asked.
That hope runs into silence. When he looks back for help, he finds everyone busy with themselves, and he is left alone. The weather then mirrors his mood: heavy clouds gather, and rain pours down. He looks up for the sunshine he tries to be for others, but none appears. The final line blurs rain and tears so that we can't tell them apart. The mood is gentle but lonely, a quiet ache about giving freely and receiving nothing back.