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I suppose it could be humidity it will not persist day after day. Try it on a different day, if you see constant steam or "white smoke" (esp at idle)...you have water in the cylinder. Pull the plugs to confirm. You will see the culprit cylinder. If they all look exactly the same then you probably don't have water in there. If one looks a lot different or has water on it, that is the problem. Generally, if it is humidity is only lasts a short while until the conditions change a little then clears up.
I didn't mean to freak you out with the cracked block, its rare but it can cause water vapor in the exhaust. If it happened right after winter storage and the engine was not winterized properly then it is a greater possibility.
My bet would be if it is not the humidity and it persists for more then one day you have a leak in a gasket. ( I had a 40 hp that had this problem, it ran fine with a small head gasket leak but steam was seen in the exhaust)
If this is under warrenty, bring it back pronto and let them deal with it.
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