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If it is fresh water, and the surface is at sea level, then the pressure at the surface is 14.69 psi. As you submerge, then the pressure from the weight of the water above you is added to the air pressure above the water. For each foot that you descend, the water pressure will increase by 0.4331 psi, so at 328 feet deep, the water pressure is 142.0568 psi. Add the 14.69 psi air pressure to get 156.7468 psi.
Yes, unless you are diving to a rather deep depth. One atmosphere is 15 pounds per square inch (or PSI.) A 5 ATM watch should be resistant to water entrainment to a pressure of 15*5, or 75 PSI. That would correspond to a depth of approximately 150 feet, depending on whether you are in fresh or salt water. Watch out, though - many watches not designed for diving have leather or other types of bands that can be damaged by water, especially salt water. (Anything you wear in salt water should be thoroughly rinsed afterwards to get rid of sea salts.)
It is 262 deg Celsius.
15psi
You need to know how high the water column is to calculate the pressure it exerts at its base! For example, a column of water 1 metre deep would exert a pressure of 9.81 kPa at its base (density x gravity x depth - 1000 * 9.81 * 1). This would be equal to approx 1.42 PSI.