Skywatchers across the UK are in for a celestial treat tonight as the final supermoon of 2025, known as the Cold Moon, reaches its brilliant peak. This December full moon marks the spectacular conclusion to a series of supermoons and offers a dazzling display for anyone with a clear view of the night sky.
When and How to See the Cold Supermoon
The lunar spectacle will be at its absolute fullest at approximately 6:14 p.m. Eastern Time (ET) on Thursday, 4 December 2025, which translates to late evening in the UK. According to astronomy site EarthSky, the moon will also appear completely full for observers on Friday night, providing a second chance for viewing.
This supermoon is the third in a run of four consecutive supermoons. Its close orbit to Earth, a point called perigee, will make it appear up to 14 percent larger and 30 percent brighter than a typical full moon at its farthest point. The best viewing requires no special equipment—just find a spot away from bright city lights and hope for clear conditions.
A Rare and Brilliant Lunar Event
While the difference in size and brightness is a measurable astronomical fact, it can be surprisingly subtle to the naked eye. The true magic lies in knowing you're witnessing our celestial neighbour at its closest and most luminous for the year. This particular Cold Moon is also notable for being the highest full moon of the entire year in the sky.
This event brings the supermoon sequence of late 2025 to a close. Enthusiasts looking ahead will need to be patient, as the next supermoon is scheduled for 3 January, followed by a significant gap until the next one on 24 November 2026.
Your Stargazing Guide for Tonight
To make the most of this astronomical event, plan to look east as darkness falls. The moon will rise, appearing large and luminous on the horizon. Although binoculars or a telescope can enhance the view by revealing craters and lunar seas in greater detail, they are not necessary to enjoy the main event.
Remember that weather is the key factor. Cloud cover is the only thing that can obscure this free public spectacle, so check your local forecast. Wrap up warmly if you're heading outside, find an unobstructed vantage point, and enjoy the last, cold supermoon glow of 2025.
