September 2025 Moon Phases. The 2025 moon phases schedule will help you look back at when the new, first quarter, full, and last quarter moons occurred each month of the year. The calendar below depicts the phases of moon in each day of september 2025.
The beginning of september 2025 starts with a full moon moon phase that is 100.00% illuminated. The month of september 2025 begins with a first quarter phase that is illuminated to 68.06%.