May is shaping up to be a proper treat for skywatchers, with the May night sky events offering everything from a rare blue moon to a Milky Way showstopper and a handful of eye-catching planetary meet-ups. For South Africans willing to step away from the city lights, this is the kind of month that rewards patience, clear skies and a bit of planning. Whether you’re heading out to the Karoo, the West Coast, a game reserve or even just a dark patch outside town, the celestial calendar is unusually generous.
The standout theme this month is variety. We’re not talking about one big event and a few fillers. The May night sky events include a meteor shower, two full moons, close approaches between the Moon and bright planets, and some of the best conditions all year to spot the glowing core of the Milky Way. In other words, if you’ve been waiting for a reason to look up, May has handed you several.
The month opens with the flower moon on May 1, the traditional name for the full moon associated with blossoms in spring in the Northern Hemisphere. While the name may feel a little foreign in the South African autumn, the viewing advice still applies. The best time to watch is around moonrise or moonset, when the Moon sits low on the horizon and can look bigger, warmer and more dramatic than it does overhead.
A little later, the Eta Aquariid meteor shower reaches its peak overnight between May 5 and 6. This shower is known for fast, bright meteors that leave short-lived trails across the sky. Astronomers say it can produce a few dozen meteors per hour under ideal conditions, though this year a bright waning moon may wash out some of the fainter streaks.
That does not mean it is a write-off. Under genuinely dark skies, the shower should still be visible, especially in the hours before dawn. For South African stargazers, this is the sort of event where location matters more than equipment. Even a modest escape from city glare can make a major difference.
On the mornings of May 12 and 13, the eastern sky serves up another visual alignment worth getting up early for. Mars, Saturn and the crescent Moon will appear close together before sunrise, forming a tight grouping just above the horizon. The scene should be visible about an hour before sunrise, making it ideal for early risers with a clear view to the east.
If you miss the exact pairing, don’t worry too much. The trio should still hang together in a looser pattern on May 14, when the Moon becomes a very thin crescent. As we often remind readers, a flat horizon helps a great deal here, so a beach, dam wall, open field or hilltop can give you the best shot.
May night sky events peak with a dark-sky Milky Way display
The big one for photographers and serious skywatchers arrives around May 16, when the new moon creates the darkest skies of the month. That is prime time for viewing the Milky Way core, which is exactly the sort of thing South Africa is brilliantly placed to enjoy. Our country has some of the continent’s best dark-sky terrain, from the Northern Cape to remote stretches of the Karoo, and this is when those skies really come alive.
With no lunar glare to interfere, the galaxy’s bright central region should stand out far more clearly. The core is expected to rise around 11 p.m., depending on your location, and remain visible until the pre-dawn hours. For those with a camera, this is also the best window to photograph the Milky Way. Long exposures, a stable tripod and a dark site away from streetlights can make all the difference.
The new moon also opens up better telescope viewing of deep-sky objects. Among the easier targets are the Whirlpool Galaxy and the Sombrero Galaxy, both of which become more rewarding when the sky is properly dark. These are not naked-eye targets, but they are the sort of sights that make a good telescope feel like a time machine.
Then comes the Moon-Venus conjunction on May 18, just after sunset. Venus, the brightest planet in the night sky, will appear in close company with a slender crescent Moon over the western horizon. The pair should remain visible for about two hours, offering one of the month’s prettiest twilight scenes.
That same evening, Mercury should also be visible low in the west, while Jupiter sits higher above the Moon-Venus pairing. It is a busy sky, and one that rewards careful scanning once the sun has fully disappeared. If you are using binoculars or a telescope, make absolutely sure the Sun is gone before pointing any optical aid west.
The month ends with a rare blue moon on May 31, meaning a second full moon in the same calendar month. According to NASA, this happens only once every two to three years. Despite the name, the Moon will not actually turn blue. It may instead look yellow or orange near the horizon, just like many full moons do.
The term “blue moon” is one of those pieces of skywatching language that causes confusion every year, but the rule is simple: it refers to the timing, not the colour. A moon only looks genuinely blue when Earth’s atmosphere contains unusual particles, such as volcanic ash or smoke, that scatter light in a particular way.
Through the whole month, Jupiter remains one of the easiest planets to identify. It shines in the western sky and acts as a handy guidepost for finding Gemini, the constellation of the twins. The planet sits near Pollux and Castor, Gemini’s brightest stars, so even casual observers should be able to pick it out.
Jupiter also edges closer to Venus as the month goes on. At the start of May, the two planets sit about 40 degrees apart, but by the end of the month they close to roughly 14 degrees. Mercury enters the picture later too, becoming easier to see as it moves towards its greatest eastern elongation in June.
For South African readers, the practical message is clear: if you want the best of the May night sky events, get away from the lights, check the weather, and give your eyes time to adjust. The month offers enough celestial drama to keep casual observers and dedicated astrophotographers equally busy. And with our wide-open landscapes and dark rural skies, South Africans may have a better view than most.