When atmospheric relative humidity (RH) exceeds 100%, water must condense out of the air. We typically see this as rainfall.
In North-Eastern U.S. summers it is common for daytime air to reach above 80°F and 70% relative humidity. I.e., the daytime dew point (the temperature at which RH would exceed 100%) is commonly above 75°F. It is also common for air temperature to fall 15-20°F during the night. Assuming a dryer atmosphere doesn't move in every night, shouldn't we expect it to rain every night under these conditions?
As a resident of this region I have observed that in reality it frequently does not rain at night under these conditions. So how is the atmospheric humidity dissipated during the night if not through rain?