Three short lines, and the whole mood turns on one surprise: the speaker is happy about being rained on. The rain "found us," as if it had been searching, and instead of complaining, the speaker says plainly, "I am glad." The word "us" suggests the speaker isn't alone, though the poem never says who else is there.
What the rain gives is stranger and more interesting. It offers "a land to tenant," meaning a small territory the speaker can live in for a while, the way a tenant rents a home. Rain closes the world in. The view shrinks, sounds soften, and the outside feels farther away. The words "close and quiet" capture that feeling of being sheltered inside the weather itself.
The mood is calm, intimate, and grateful. The poem is so brief that it feels like a held breath, and the pause at "quiet" leaves the reader sitting in that hush too.