Jupiter - Located in Leo, the "king of the planets" is well placed for viewing from sunset till 11:30 pm EDT.  Jupiter can best be seen around 9:00 pm at mid-month, when it will be 45 degrees up in the SW.  Jupiter will be magnitude -2.0 and have a diameter of 36 arc-seconds.

Jupiter's Great Red Spot, a large anti-cyclone, can be seen centered on the planet's disc at the following times (EDT):

06/02, 09:25 pm06/14, 09:23 pm06/26, 09:22 pm
06/04, 11:04 pm06/16, 11:02 pm06/28, 11:01 pm
06/09, 10:14 pm06/21, 10:12 pm 

Additional times for viewing the Great Red Spot can be found here:

http://www.projectpluto.com/jeve_grs.htm

Some excellent images of Jupiter can be seen here:

http://astro.christone.net/jupiter/index.htm

A guide for making visual observations of Jupiter can be found here:

http://www.rjm-astro.net/Observing_Jupiter.ppt


Mars - Located in Libra, Mars passed through opposition on May 22nd and can still be seen most of the night during June.  Look for it 27 degrees up in the south around 11:30 pm EDT.  The "red planet" will fade from magnitude -2.0 to -1.4 and have a diameter of 19 to 16 arc-seconds.  The northern hemisphere of Mars will be tilted 14 degrees to our line-of-sight during the month.

Recent images of Mars made by amateurs can be seen here:

http://astro.christone.net/mars/index.html

http://www.acquerra.com.au/astro/gallery/mars/index.live

For an excellent view of Mars, check out the view from the Mars Rovers Curiosity and Opportunity:

http://mars.jpl.nasa.gov/msl/

http://marsrovers.jpl.nasa.gov/home/index.html


Saturn - Located in Ophiuchus.  The ringed planet reaches opposition on June 3rd and is visible for most of the night during June.  It can best be seen around 12:30 am EDT, when it will be 28 degrees up in the south.  Saturn will be magnitude 0.1 with an apparent diameter of 18 arc-seconds.  The rings will be 40 arc-seconds across with a tilt of 26 degrees to our line-of-sight.

Some excellent images of Saturn can be seen here:

http://astro.christone.net/saturn/index.htm


The Cassini spacecraft continues its observation of Saturn and its many moons and rings.  For the latest images from Cassini, see:

http://saturn.jpl.nasa.gov/home/index.cfm


Neptune - located in Aquarius.  Neptune can best be seen around 5:00 am EDT at mid-month, when it will be about 35 degrees up in the SE.  Neptune will be magnitude 7.9 and have a tiny 2.3 arc-second pale blue disc.  Neptune will be located only 30 arc-minutes from 3rd magnitude Lambda Aquarii during June.

Observers with 8 inch and larger scopes can also look for Neptune's largest moon, Triton.  Triton is magnitude 13.5 and located 12 to 16 arc-seconds from Neptune.


A 2015 finder chart for Neptune can be used to find Lambda Aquarii and Neptune:

http://www.skyandtelescope.com/observing/uranus-and-neptune-in-2015/


Uranus - located in Pisces.  Uranus can best be seen around 5:00 am EDT at mid-month, when it will be 25 degrees up in the east.  Uranus will be magnitude 5.9 and have a tiny 3.5 arc-second pale green disc.


A 2015 finder chart can be used to extrapolate the 2016 position of Uranus:

http://www.skyandtelescope.com/observing/uranus-and-neptune-in-2015/

At least four of Uranus' moons can be seen with larger amateur scopes.  These moons can be identified using this page:

http://www.skyandtelescope.com/observing/objects/javascript/3310476.html


Mercury - Visible in the morning sky during the first three weeks of June.  Look for it 4 to 5 degrees up in the ENE about 30 minutes before sunrise.  Mercury will brighten from magnitude 0.7 to -1.0.  The planet will have a diameter of 9 to 6 arc-seconds and a phase that ranges from a crescent to gibbous.