D-Day Was Scheduled for June 5th, 1944
The invasion of France was actually scheduled for June 5th, 1944. And to pull off the invasion, General Dwight D. Eisenhower was hoping for a full moon, a low tide, a little overcast, light winds, and low seas. Why the low tide? Because the soldiers needed to be able to see, avoid, and disarm the mined obstacles that the Germans placed in the surf.
Eisenhower could have had the full moon and low tide on June 5th, 6th, or 7th. The low tide, without the full moon, was due for June 19th or 20th. But what about the weather? On the morning of June 4th, the skies were mostly clear, with a light breeze.