For a great website to locate the planets, go to www.nightskyinfo.com. This site will tell you about the planets and give you a good star map to locate them (116).
Sunset Sky: (Sunset until 11 p.m.)
Well, Mercury has set in the west so it is not visible.  Saturn has set in the west as well. In fact, Saturn is in conjunction with the Sun on September 18th.
At sunset, the brightest planet visible to the naked eye is, Jupiter, the Gaseous Giant. It is high in the southeast as the sky darkens. You can also spot Uranus low in the east at this time as well if you know where to look and have good clear, dark skies.
Don’t forget to look for Neptune at this time as well. It will take a pair of binoculars or a small telescope but it is easily within reach if you know where to look.
Late Evening (11 p.m. until 4 a.m.):
Since Jupiter transits around 10 p.m., it will not set in the west until around 3 a.m. or so. You can also see Uranus and Neptune to the east of Jupiter, following it in a short parade of planets from the east to the west.
Predawn Sky:Â (4 a.m. until sunrise)
The early morning sky holds Mars, high in the south east. Look for its beautiful amber hue. Next you will unmistakably see Venus, the Morning Star. Venus is easily the brightest object in the eastern sky before sunrise. If you have the equipment, look at it through a small telescope to see that it is in a gibbous phase.
It is interesting to note the Venus and Mercury are the only planets that go through the phases like the Moon.