This poem means that the autumn wind is getting colder. Looking out in the autumn wind will make you miss your hometown again tonight.
"The autumn wind is cool, don't think about it tonight." It expresses an emotional conception of autumn, which means that if you look out in the autumn wind when the autumn wind is cool, you will miss your hometown again tonight. It means that on this autumn night, the poet bids farewell to a specific person or thing and no longer misses and recalls it too much. The whole poem reveals a hint of sadness and parting mood, showing the bleak beauty of autumn.