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Dust particles in the air refract the sun's light... this is normally when the air is quite dry.  If the evening sky is red, that is to say, the western sky, then you may assume the weather headed in your direction is dry.  If the morning sky is red, that is, the eastern sky, you may assume the dry weather has past, having been pushed east by rainy weather coming in from the west.   From the Bible, Matthew 16:1-3   (Jesus said)... "When evening comes, you say, 'It will be fair weather, for the sky is red,' and in the morning, 'Today it will be stormy, for the sky is red and overcast.'