You ask how long before I come. Still no date is set.
The night rains on Mount Pa swell the autumn pool.
When shall we, side by side, trim a candle at the West window,
And talk back to the time of the night rains on Mount Pa?
another translation:

Writing to My Wife at a Rainy Night

I cannot foretell when to leave Mount Ba for our reunion.
So far the Autumn Lake is rising with the night rain.
I don’t know when to light off our wedding candle again;
We’ll recall what happened tonight with the rainy mountain.