What is the moon phase today? Today, Aug. 10, 2025, the moon is 17 days old and is in the Full Moon phase of its lunar cycle. It is 97% illuminated. Moon phase Date First Quarter Aug. 1 Full Moon Aug.

Most of us notice the moon changing shape in the sky, but most people don’t ever stop to think about why it happens (except maybe the science geeks among us). Of course, those changing shapes in the ...