It's a full moon tonight, the full moon closest to the autumn equinox, known as the harvest moon. Full moons always rise very close to sunset (the moon is full because it's opposite the sun, you see). For these few nights there is no long period of darkness between sunset and moonrise. The moonlight sort of extends the day, granting farmers extra time to bring in their crops, hence the name.
The harvest moon also appears larger and yellower than usual. This is because you tend to view it when it is close to the horizon. Because you are looking at it through a great thickness of atmosphere, differential scattering makes it look yellower or redder than normal. If you take a photograph of it, the change in colour will show up on the photo so this is a real effect even though the actual moon has not changed colour.
The apparent increase in size is just an illusion, though. If you measure the size of the moon, it is no different than at other times. But our minds perceive objects close to the horizon as being larger than objects higher in the sky. Even though I know it's just an illusion, it's still a very convincing one, and the harvest moon is a stunning sight. I hope we get clear skies tonight so I can go out from about 7pm and look at it.