Watch out in the sky on Aug 22-23: Black MoonBlack Moon is again here. Blue Moon or Black Moon? The second Full Moon is called Blue Moon, or more appropriately Black Moon, as it won’t be visible in the night sky. Also, the August 2025 Black Moon is a seasonal Black Moon, falling in the summer season that unusually has four new moons. This 2025 seasonal Black Moon – otherwise known as this month’s new moon – will fall at 6:06 UTC (1:06 a.m. CDT) on August 23.