Tonight, May 20, 2025, there is no Blue Moon. The next monthly Blue Moon (the second full moon in a calendar month) will occur on May 31, 2026, and the next seasonal Blue Moon (the third full moon in a season with four full moons) will be on May 20, 2027

. A Blue Moon is a rare event that refers to either the second full moon in a calendar month or the third full moon in a season with four full moons. It does not mean the moon actually turns blue in color; that phenomenon is caused by specific atmospheric conditions such as smoke or volcanic ash

. The most recent Blue Moon was on August 19, 2024, which was a seasonal Blue Moon and also a supermoon, making it appear brighter and larger than usual

. However, there is no Blue Moon tonight.