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Ditto to Merlin. Also you may also find that there is a temperature gradient from gound level up to your balcony, ie colder at ground level; dew point reached more quickly, warmer at balcony level (and more air movement which also affects dew forming); less chance of reaching dew point.
The other thing to remember is if you are near vegetation they will be transpiring moisture laden air into the surrounding environment which will increase the relative humidity of the localized microclimate.
Is the pool heated? Covered? Whether the pool will greatly effect the local RH will to a large degree depend on its temperature in relation to the local ambient air temp. If it is significantly above ambient then it will likely be contributing to the RH over the pool, but if non-heated and fluctuating with the ambient it is much less likely. It has more to do with the convection of warm moist air above the pool away from the pool and then cooling down to dew point, rather than moisture coming directly from the pool. If the temperature around the pool is low enough for dew to form then the air is unlikely to absorb moisture directly from the pool, it can only happen if the air above the pool is warmer than ambient and can absorb moisture.
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