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You need to do one or a combination of three things.
A- Ventilate the attic space so it is cool and so moisture can exit the house, You might have ventilation that is not adequate, You should have one sq ft of vent for eery hundred to hundred and fifty feet of living space, asa general rule of thumb, and it should be vented from eave to ridge. Only one or the other does not work.
b - You need to have a vapour barrier to stop moisture from migrating from living space to the attic and keep the hatch closed and sealed too. The VB is normally installed during construction. There are VB paints you can apply to ceilings but they have marginal effectiveness.
C - You should reduce the interior humidity to around 20% if you can stand it that dry. people are more comfortable at 40% but houses are not.