What astronomical phenomenon is the yellow sky tonight? Is this a sign of rain or something?

If it only turns yellow on the horizon, it is sunset glow, which means that the weather in the upper reaches of the west has turned fine or the clouds have split, and the sunlight can penetrate to cause sunset glow, which means that the rain clouds shrouded in the local area are about to move eastward and the weather will turn fine.

If the sky turns yellow, it may rain. Because blue-violet light with short wavelength is easy to scatter, orange-yellow light with long wavelength has strong transmission ability, and water vapor condenses into clouds in the air. Only the yellow light with longer wavelength passes through the clouds, and the scattering turns the sky yellow.