the 50%RH is pretty good for most homes. The fun starts during low/no cooling load conditions when this not enough cooling load for the a/c to remove the moisture. Your will rise depending on the outside dew points, occupants, and limited a/c operation.
A dehumidifier is good solution to the problem of maintaining <50%RH during the rest of the year.
Regards TB
Bear Rules: Keep our home <50% RH summer, controls mites/mold and very comfortable.
Provide 60-100 cfm of fresh air when occupied to purge indoor pollutants and keep window dry during cold weather. T-stat setup/setback +8 hrs. saves energy
Use +Merv 10 air filter. -Don't forget the "Golden Rule"