Here is what Sony says about A99 weather sealing

Nordstjernen wrote:

The A99 is obviously not guaranteed to work in rain or take a water splash, according to Sony. So for those of us bringing our A99 cameras out into the rain, we have to take a bit care. This is what Sony says on the US web side (note that in many other countries they name the A99 a camera for professional photographers):

Dust and moisture protection

Outer body and moisture countermeasures include the sealing and treatment of major operational buttons/dials and a convex/concave mating structure that tightly interlocks components. Controls also feature a durable structure that withstands the touch usage of advanced amateurs.

Also note that other cameras like the high end Nikons and Canons also are weather sealed, but they are not specified to take rain or splashing water. Thin might be a surprise, but also Pentax is very restrictive with their technical spesifications, in strong contrast to their advertising.