In this subtropical climate you're pretty much guaranteed to have two or three (or more) summer days a week with skies darkening after 3 or 4 p.m., the uptick of stickiness in already-humid air, the low rumble of thunder and then, with a release that matches the heat of the day, a lovely, brief torrent.
There was a downpour like that yesterday, a fitting way to say (sigh!) ... goodbye to the beach.