you could have googled yourself

http://www.bom.gov.au/weather-services/about/cloud/cloud-types.shtml

Hello

I have a good reference giving a satellite climatology of cloud top. Usually 15 km cloud top is not uncommon under tropics and probably higher in so-called hot towers.

Also, your question has been answered by meteorologist before (see answer by a meteorologist below):

June 16, 2010  (Chicago Tribune)

 Dear Tom,

What is the highest recorded height for a cumulonimbus cloud?

—Larry O'Neal and Doug Moeller

Dear Larry and Doug,

 As a rule, the higher the thunderstorm's top the more severe the thunderstorm is likely to be. Thunderstorms with the highest tops host the strongest updrafts, sometimes as high as 100 mph and form in the area of greatest lift and instability. In the Chicago area, typical summer thunderstorms develop to heights between 35,000 and 45,000 feet, but the tops of severe thunderstorms that produce large hail and damaging winds can reach 60,000 feet. The devastating F5 Plainfield tornado on Aug. 28, 1990, towered to 65,000 feet.

The tallest thunderstorms on Earth form in the tropics where tops have been measured to about 75,000 feet — more than 14 miles into the atmosphere.

Reference:

http://articles.chicagotribune.com/2010-06-16/news/ct-wea-0617-asktom-20100616_1_thunderstorms-tops-cumulonimbus-clo

I gave a description of formation of clouds. The same has seen to be discarded as it is not seeen here.

Clouds form even upto mesosphere.

Rain occurs for clouds below 8 km in tropical areas.

I am going to give you an answer specific to India, where this question appears to be originating.  You can have tons of moisture flowing over India or any country during the monsoon season from India to Morocco.  However at least two factors determine if that moisture is going to form rain clouds over a particular area of land.

1.) Got Pseudomonas bacteria? If the moisture picked up enough Pseudomonas bacteria from the tree-hosts in SE Asia (Malaysia, Indonesia, etc.) and you still have some Pseudomonas host-trees in your own country (Western Ghats for example) maybe you will get rainfall.

2.) Got Dust Clouds? However the big destroyer of rain is the man-made Dust Clouds, like the "Pakistan-Arabia Dust Cloud" that has been moving eastward to cover most of India for the last year or so. The atmospheric dust can dissipate or deflect rain clouds, so the result is moisture going over clear skies and no rain and records temperatures accompanied by horrible relative humidity--sound familiar?

So if India and all of the countries westward that expect regular and normal monsoon moisture every summer, start monitoring the daily Pseudomonas bacteria in the atmosphere plus monitor the daily atmospheric dust levels (already being done by the NAAPS project here in Monterey, California), then those two factors can be included to help answer your question about water vapor and rain cloud formation.

If you search on Research Gate under "Questions" about "Pseudomonas and clouds", you will see many questions I have posted along with images of Pseudomonas-produced clouds. And there is at least one researcher on Research Gate in India looking into the Pseudomonas-rain cloud issue, Hema Priyamvada.

Dear Craig Carlton Dremann, 

Thank you for your vast research. Though it is thought, a nucleus is required to for rain drop formation this not a fact, this is only an imagination. Thus bacteria and dust can not help for rain, only a favorable condition of atmospheric pressure, temperature accompanied by wind flow/velocity causes rain. My question was up to what level (in metres/km) moisture is found in atmosphere to condense as rain? 

I have two descriptive answers more. But this site it is not containing them.

IN CONDUSIVE ATMOSPHERE RAIN MAY OCCUR UPTO ABOUT 8000 METRES ABOVE SEA LEVEL. 

Read more about the Pseudomonas bacteria producing the nuclei for rainfall. And the smallest amount of atmospheric dust that we can currently remotely measure at 20-40 micrograms per cubic meter, cancels rainfall, and does not help promote rainfall, as once thought.  

Plus higher levels of dust can cancel the strongest Category-5 cyclones, like you can see at http://www.ecoseeds.com/GONU3.html, making the Dust Clouds the strongest weather modifier on the planet.  Dust Clouds beat Category-5 cyclones, every time.

Dear Unnikrishna Kaimal,

Thank you,sir,  for your answer. Cloud formation and condensation of water vapor up to 8000 metres above sea level in atmosphere is a correct answer.

 Dear, Kenneth M Towe:  Water vapor (moisture) has excellent wetting properties to form and grow to droplets size to condense and precipitate as rain under favorable conditions of temperatures and pressures in atmosphere. Sir, you say bacteria a living organism playing a role for formation of rain. Can you please light upon the physics of the process involved, as such from where do these bacteria come, how they grow? and to where they go after rain and cyclone?  Rather we can say these dust & bacteria are getting attached to these well defined and excellent wetting agent:water droplets after their due formation, as they travel and mix in free space.

mr Muduli

Rain is CONDENSED water in liquid form that is fluid

Rain starts as cloud droplets and those are formed on aerosol particles

I strongly advice to consult a textbook like

Prupacher & Klett

Ken

Just noticed that you also addressed me in the latest reply

Sure it depends on latitude going from towering cumuli up to 20 km in the south of your country to low stratus at the poles; but why do you ask? as always the questioner does not react himself why he asked it and apparently never read a textbook like the one I mentioned or even searched in Wikipedia on the origin of precipitation

Dear friends,

   You can get a copy of a standard Te-Phi-gram or Skew-T diagram used for calculation of Thermodynamic parameters of atmosphere.  You can see Isohygric lines printed therein. These Isohygric Skew-T lines or T- Phi mixing ratio standard lines give probable moisture presence in Troposphere.  Mixing ratio of moisture varies normally from 42 gm/Kg at Tropical sea level to a few gm/Kg at freezing level (4-5 km) at trpical latitudes. As per standard meteorological textbooks on Thermodynamics and Cloud Physics cloud generations can be understood.  Rain bearing clouds probability in the Troposhere is assured from ground level to tropopause level. As an example of observational experience rain above 8000 metres above sea level occurs only rarely.

High vertical condusive development of Cumulonimbus can take rain bearing property even upto 18-20 km above sea level in tropics in cyclones and typhoons and thunderstorms. 

Refer books on Tropical Meteorology.

Thank you, sir, Mr.Kaimal, your answer is quite practical as we see in nature. Because in a rainy weather, while travelling in a flight, we observe no clouds seen after the plane rises certain height in atmosphere and below that height clouds are seen. That height is probably 8000- 9000 metres. 

Planes DO NOT GO THRU Towering Cumuli !

Sir, Harry ten Brink please see that weather activities and flying of aeroplanes are almost in the same zone of atmosphere. Planes flying higher heights face disaster like Malayasin one in bad weather above 34000 feet height. What is your opinion in this regard?. My nephew visits your neighbouring country often to teach his PhD (Physics) fellowship students in Sweden.

NO: planes do not go thru lightning producing towering cumuli

Thank you, Mr.Neeraj Kumar, you have a very good concept regarding atmospheric air and level of cloud formation with distribution of sun's energy over various strata of atmosphere. 

It's already discussed. 

Answers clearing doubts are given.

See earlier Q and A  given few months back.