Adding to the June gloom concept, the gloom does not always happen in June and June does not always have gloom! But when it does happen the PP is quite right that it tends to dissipate by noon. Basically do not worry about it too much. And the water temperature will be, uhhh, refreshing.
So true - we also have "May Gray" and my DH and I were just today trying to think of a term that rhymes with April!
"Refreshing" - yes, that's the word for it, ha ha.
OP, I completely agree with Hydroguy - just wanted to encourage you to have a loose schedule because June weather is unpredictable - the afternoons are almost always glorious - just never can rely on the mornings!