possibly. anything above 60% in veg and 55% in flowering should be kept a close eye over incase of mold. Moreover too much humidity cloggs the stomata and slows photosynthesis. any kind of leaf fungus, bud mold, root rot ext is a complete bastard to get rid of, i would advise taking measures to prevent it, what kind of ventilation do you have? because extraction fans are the most efficient way of allowing fresh c02 to enter the space and keeping humidity down; if its a small grow you could invest in silicone and place a pot of it in the space to soak up excess moisture.
hope that helps