Rain-Obscured Harvest Moon (Sampler Only Version)

Rain-obscured harvest moon has no perfect one-word equivalent in English,
but its meaning can be expressed like this:

Rain-obscured harvest moon
or
The full moon hidden behind autumn rain

More poetically:

A night when the harvest moon should shine,
but rain veils it from sight.

Key nuance in English:

The moon is expected to be there

Its absence is what creates the mood

Beauty comes from anticipation and imagination, not visibility

So it's not just "rainy moon", but:

The beauty of something that exists, yet cannot be seen.