I am trying to plan my honeymoon. Can anyone please tell me where I
need to go in the World to get the best diving and the the least rain
(in other words sun!) during the months of May and June next year?

Hello, m8evns:
  To answer this question, first of all, I have searched a list of
places to scuba dive all around the world, and this is the best
website I have found:
  
World Wide Travel - Scuba diving
http://scubadiving.com/travel/    

Following is a list of places to dive, each one links to a page
describing the place:
  
Atlantic Ocean & Caribbean
http://www2.scubadiving.com/travel/atlantic.shtml

Aruba
Bahamas
Barbados
Bay Islands, Honduras
Belize
Bermuda
Bonaire
Brazil
BVIs
Cayman Islands
Cayman Sister Islands
Chinchorro Bank
Cozumel
Cuba
Curacao
Dominica
Dominican Republic
Florida Keys
Grenadines
Isla Cubagua
Jamaica
Panama
Puerto Rico
Saba
St. Vincent
St. Lucia
St. Kitts & Nevis
Tobago
Turks & Caicos
USVIs
Venezuela 

Pacific Ocean
http://www2.scubadiving.com/travel/pacific.shtml

Australia
Baja & the Sea of Cortez
Costa Rica
Fiji
French Polynesia
Galapagos
Hawaii
Micronesia
Panama
Papua New Guinea
Sipadan, Malaysia
Solomon Islands
Ulithi 

Indian Ocean
http://www2.scubadiving.com/travel/indian.shtml

Maldives
Red Sea
South Africa
Seychelles 

Here you can find a list of live aboards:

Live aboards list
http://www2.scubadiving.com/travel/liveaboards/

Respect precipitations of each place, here is a link with a huge
historical worldwide database of weather conditions, you can get
average precipitations on May/Jun, average temperature, etc.

WeatherBase
http://www.weatherbase.com/

So, choose the places you like, check out the average precipitations
and temperature and don't forget to send a postcard ;-)

I hope this is the information you were looking for, and don't
hesitate to request for any clarifications.

Search Strategy

"scuba diving"
://www.google.com/search?hl=en&ie=ISO-8859-1&q=%22scuba+diving%22&lr=

world weather database
://www.google.com/search?hl=en&ie=ISO-8859-1&q=world+weather+database&lr=

Regards.

Thanks for the answer. A great help!

Well, since the question has been answered, I can push my favorites at
you with no shame.  You want sun?  You want to bake?  You want no
danger of rain?  You want the world's greatest diving?  You want to be
just a few minutes from some of the most spectacular coral reefs to be
found anywhere?

You want the Red Sea.

Each of the following has a personal recommendation.  But since we are
anonymous in here, that will mean very little.  But for excellent
desert scenery, the Red Sea.  For plenty of heat and sun, the Red Sea.
 And I don't even have to mention the diving.  The Red Sea has it all.

I'll start with the Grand Plaza Hotel in Hurghada, Egypt.  Their
website is:
( http://grand-plaza.net/ )  - There is also a great little bar called
"peanuts" which is at the Three Corners Empire Hotel not far away.  It
is a hangout for a lot of Germans, Brits and Americans.  It can also
be crowded.  You'll find a good selection of cafes, coffee shops,
restaurants, and nightlife.  Hurghada has been one of my favorite
vacations spots for more than a decade.

Then I'll head you across the sea to Jordan and the Mövenpick Resort. 
It only opened in 2000, so I have not seen it - - - - yet.  But I will
pass on the experiences of two of my colleagues who have been there. 
"It is 100% Arabian Nights pampering."  Of course it has all the sun,
beaches, and diving trips expected with a Red Sea resort.  their
website is :
( http://www.zaraholding.com/AQABA.htm ) - They are right next door to
the Royal Yacht Club.  (funny, they would never let me in the place)

I cannot really recommend any hotels in Aqaba from personal experience
since I have always stayed with friends when there.  However, the
community has luxury resort status and I'm sure they could not keep
that without offering first class accomodations.

Regardless of where you decide to go, try to wind up on the Red Sea.

Happy honeymooning!

digsalot