Just make sure to check the weather forecast (as mentioned above) before you head up.
Experience had taught us to expect nothing of the weather. Eric Shipton, Land of Tempest page 753
Dayhiking (and ability to descend rapidly to safety) is one thing, but camping overnight (as poster mentioned), or twisting an ankle or becoming ill and being stuck there, is altogether another situation. I would "err" on the side of taking a bit more. Personal experience tip: don't think that a rain coat is enough and leave the rainpants at home. Think horizontal and especially updrafting wind +/- precip. Go out there enough and these things do happen. Are most August days nice and easy? - yes. All? - no. Play it safe.
