Hazel McKay's poem is a small, quiet moment: someone is indoors or nearby, listening to rain, and surrounded by plants. Instead of treating the rain as gloomy or something to escape, the speaker calls it "peaceful." That one word sets the tone for everything else.
The final line makes a leap. With the rain falling and the greenery close by, the speaker says it feels like being in a rainforest. The comparison is imaginative but gentle. Nothing dramatic happens, and the speaker doesn't leave the room or the house. Instead, an ordinary scene becomes something larger and more exotic, just through the way it is noticed.
The mood is calm, cozy and a little dreamy. The short lines and plain wording mirror that feeling, as if the poem is taking a slow breath. It suggests that peace can be found in everyday surroundings if we pay attention, and that imagination can turn a rainy day into a small escape.