Mexico's December 2025 Supermoon Will Dazzle Skies—If Weather Allows

A supermoon will light up the skies over Mexico in December 2025. The event begins on the evening of December 4 and will be visible across the country. NASA and UNAM may provide an online broadcast for those unable to see it directly. The supermoon starts at 5:14 p.m. in Mexico City on December 4, 2025. It will reach its brightest point around 9 p.m. the same day. This phenomenon occurs when the moon is both full and at its closest point to Earth in its orbit.

Under these conditions, the moon appears about 14% brighter than a typical full moon. It will remain visible to the naked eye from anywhere in Mexico. At dawn on December 5, around 5 a.m., the supermoon may still be seen in the capital.

However, light pollution in Mexico City could make it harder to observe clearly. Heavy rain is also forecast for December 4, which may further obstruct the view. Science writer Andrea Fischer, who has contributed to National Geographic en Español and Muy Interesante México, now covers such events for Mexico News Daily. The supermoon will be a notable astronomical event for Mexico. Its brightness and visibility depend on weather and local conditions. NASA and UNAM’s potential online stream could offer an alternative for those affected by poor visibility.