Evening, a time when the light and heat are fading away, represents a state in which a person -- or a community of people -- is turning away from the Lord, with little desire left to be good and little knowledge left regarding what good is. Evening is often a time of judgment.

In Genesis 19:1, the evening signifies the visitation that comes before judgment. (Arcana Coelestia 2318)

In Genesis 30:16, this signifies the good or truth in a state of good, but in the obscurity that is characteristic of the natural. (Arcana Coelestia 3949)

2318. 'The two angels came to Sodom in the evening' means the visitation which takes place prior to judgement. This becomes clear from the statements made by the three men, that is, by Jehovah, in the previous chapter, also from what follows in the present chapter, as well as from the meaning of 'the evening'. In the previous chapter Jehovah said, 'I will go down and I will see whether the inhabitants of Sodom and Gomorrah have done altogether according to the cry which has come to Me; and if not, I will know', verses 20-21. At that point it was shown that those words meant the visitation that takes place prior to judgement. In the present chapter the actual process of visitation is described and after that judgement, as is evident from what follows. That 'evening' means the time when visitation takes place will be seen below. As for what visitation is and the fact that visitation takes place prior to judgement, see 2242. In the previous chapter the subject was the corrupt state of the human race and the Lord's grief and intercession on behalf of those who are immersed in evil and yet with whom some good and truth exist. The present chapter therefore goes on to deal with the salvation of those with whom some good and truth exist, it being these who are represented in this chapter by Lot. At the same time it deals with the destruction of those who are immersed completely in evil and falsity, it being these who are meant here by Sodom and Gomorrah.