Sun Halo Lights Up Singapore on August 25, Drawing Photos and Wonder Across the Island

A luminous ring turns an ordinary Monday into a spectacle

A bright ring around the sun caught the attention of Singapore residents on August 25, 2025, appearing from late morning through early afternoon and prompting photographs across the island. Sightings stretched from Clementi and Paya Lebar to Pasir Panjang and North Bridge Road, where people paused their routines to look at the unusual midday sky.

The phenomenon, known as a sun halo, brought a striking sight to a country more familiar with tropical downpours. For many residents, it was their first encounter with the ring. Photographs and videos quickly spread through Facebook, TikTok, Reddit and Instagram, while the hashtag #sunhalo trended locally.

The August display followed another halo seen on March 15, making it the second such event recorded in Singapore in 2025. Earlier appearances included a sighting in September 2020 and occasional events in the years before. Each has attracted attention because the conditions needed to see a halo occur infrequently in Singapore.

Behind the spectacle was a meeting of sunlight and ice far above the ground. Tiny crystals in thin, high clouds bent the light into a circle around the sun. The warm weather experienced at street level did not prevent ice from existing thousands of metres higher in the atmosphere.

The reaction was both public and personal. Some residents shared quick messages encouraging others to step outside, while others described feelings of gratitude or memories of family. Alongside the excitement came a practical warning from the National Environment Agency (NEA): people should avoid looking directly at the sun.

How ice crystals make a circle of light

The most common sun halo is called a 22-degree halo. Its name describes the apparent radius of the ring: the angular distance from the sun at its centre to the bright circle around it. Sunlight passing through millions of tiny ice crystals bends, a process called refraction, by about 22 degrees.

Professor Matthias Roth, a geography expert at the National University of Singapore, explained how light travelling through the crystals produces that shape:

As light enters one face of the ice crystals and exits through another, it is bent by about 22 degrees, which accounts for the radius of the halo.

The crystals act like miniature prisms. Rather than allowing sunlight to continue along the same path, they change its direction as it enters and leaves their surfaces. Many crystals bending light through the same angle create the distinctive circular appearance seen from the ground.

These ice crystals are typically found in thin cirrus clouds at altitudes above 5,000 metres. Temperatures at those heights are low enough for ice to form even over tropical regions. Singapore can therefore have warm, humid conditions near the ground while the clouds involved in the display contain ice.

A rainbow forms through water droplets, often after rain. A sun halo depends instead on ice crystals high in the atmosphere. Both involve light interacting with material in the sky, but the different materials and conditions produce different sights.

The shape and arrangement of the ice crystals also matter. Suitable crystal shapes and orientations allow the ring to appear well defined. Without the right combination of crystals, sunlight and visibility, residents looking upward would not see the same clear circle.

Why Singapore seldom gets a clear view

Singapore's usual cloud cover helps explain why a sun halo is an uncommon sight. Low and middle clouds frequently cover the higher cirrus clouds involved in halo formation. Even when ice crystals are present above them, clouds closer to the ground can hide the display.

The NEA explained both the visibility problem and the difficulty of predicting where a halo will appear:

Sun halos are not common in Singapore as they are usually covered by low to mid-level clouds. It is difficult to forecast the precise location of these ice crystals in the atmosphere, which determines where the halo can be seen.

Singapore's warm, humid climate commonly brings lower clouds laden with water. The combination needed for a visible halo, including high clouds containing ice and an unobstructed view through the lower atmosphere, is much less familiar to residents.

The precise arrangement of the crystals adds another requirement. Having high clouds overhead is only part of the process; the crystals must also interact with sunlight in a way that creates a visible ring. Forecasting their exact presence and position is difficult, which helps explain why the spectacle can arrive as a surprise.

The August 25 event gave people across several neighbourhoods a chance to see that combination at work. Its visibility from multiple locations helped turn a fleeting atmospheric display into a shared experience across the island.

Residents share excitement and personal memories

Natalie Neo, who was working from home at Farrer Road, described her first encounter with a sun halo as a blessing. Her reaction reflected the surprise felt by people seeing the phenomenon for the first time in the middle of an ordinary day.

Ow Yong Weng Leong noticed the halo while in town. For him, the experience was emotional and brought back memories of his grandmother. The ring became more than a subject for a photograph: it connected a moment in the sky with a personal memory.

In Clementi, passers-by took photographs as the halo attracted attention. Across other locations, residents reached for their phones and posted images quickly enough for friends and neighbours to learn about the display while it was still visible.

A TikTok user encouraged others to go outside and see it, recommending sunglasses in the message:

Don't miss it, guys. Go out and watch it with protected sunglasses.

A post in a Facebook group carried an even shorter alert, telling readers that the sight could be seen at that moment:

Happening now!

Those immediate messages helped spread excitement beyond the people who happened to notice the sky themselves. The advice circulating online also made viewing safety part of the conversation, with the NEA's warning against looking directly at the sun especially relevant as more people looked upward.

Photographs connect neighbourhoods and platforms

Changi General Hospital, Clementi, Bedok, Serangoon Gardens and Woodlands were among the places represented in photographs shared online. The range of locations gave residents different views of the same phenomenon, captured against the surroundings of their own neighbourhoods.

A striking image taken at Changi General Hospital attracted admiration on Reddit and prompted discussion of the science behind halos. The conversation moved between the appearance of the ring and the ice crystals responsible for it.

The Photographic Society of Singapore's Facebook page also saw a surge in activity. Members posted updates as the event unfolded and encouraged others to look up. Photography enthusiasts documented the halo from multiple vantage points across the island.

Some social media users also reported sightings in neighbouring Malaysia, extending the online conversation beyond Singapore. The posts added a regional dimension to a display that was already drawing attention across the city.

Images appeared in local news coverage, including picture features, helping preserve a phenomenon that could be seen only while the atmospheric conditions lasted. Online, residents exchanged photographs, stories and viewing tips across Facebook, TikTok, Reddit and Instagram.

The shared experience reached people of different ages and brought together those interested in photography, weather and the simple surprise of an unfamiliar sky. A photograph posted from one location could alert someone elsewhere to take notice before the ring disappeared.

Enjoying the halo without looking at the sun

The NEA's safety message concerned the bright object at the centre of the ring. Looking directly at the sun, even briefly, can cause permanent eye damage. The halo can draw attention toward that area of the sky, making caution essential during the excitement of a sighting.

The NEA had previously warned about direct viewing without suitable protection:

It will be dangerous to look at the sun directly without proper protection.

The halo itself can be observed without looking directly at the sun. Keeping the sun out of direct view is the practical distinction for anyone interested in the surrounding ring.

Recommendations circulating around the event included sunglasses and solar viewing glasses, and the TikTok message specifically mentioned sunglasses. The agency's warning focused on proper protection and avoiding direct exposure to the sun. Residents taking photographs or following online invitations to watch the display needed to keep that warning in mind.

Safety reminders were shared alongside images of the halo. They gave the public conversation another purpose beyond celebrating the sight: helping people enjoy an unusual event without putting their eyesight at risk.

March's display and earlier sightings

The previous halo reported in Singapore appeared on March 15, 2025. It was visible from locations including Chinese Garden, Serangoon Gardens, Bedok and Woodlands, with sightings reported between 11am and 3pm.

Senior Minister Lee Hsien Loong shared a photograph of that earlier halo on social media and described it as a "rare and spectacular sight." His post helped bring attention to the March event and encouraged others to share their own photographs. The image he shared concerned the earlier display.

The recorded sequence places August's spectacle alongside several earlier appearances:

• September 2020: A sun halo was documented in Singapore, following occasional sightings in earlier years.
• March 15, 2025: Residents reported a halo between 11am and 3pm, including sightings at Chinese Garden, Serangoon Gardens, Bedok and Woodlands.
• August 25, 2025: A halo appeared from late morning through early afternoon and attracted attention across the island.

The March and August events gave Singapore two recorded sightings in the same year. Earlier appearances had also prompted excitement, with residents eager to capture a brief display that was outside their usual experience of the weather.

Each sighting became a small public occasion, celebrated both online and in everyday settings. The recurring response was similar: people noticed the sky, took pictures and alerted others while the ring remained visible.

What made the August halo visible

The August 25 ring depended on several atmospheric conditions coming together. High clouds needed to contain ice crystals, while the view through lower cloud layers needed to be clear enough for residents to see the display.

• High cirrus clouds containing ice crystals.
• Sufficiently clear conditions at lower altitudes for the halo to remain visible.
• Suitable crystal shapes and orientations to produce a well defined ring.

Conditions associated with visible halos are more familiar in temperate and polar regions, where cold conditions in the upper atmosphere are common. In Singapore, the opportunity can be brief, including when winds bring high clouds from surrounding areas under favourable conditions.

The 22-degree halo is the type most often observed. Different crystal shapes and orientations can produce other, rarer halos. Some displays also show faint colours because light is separated into colours, a process called dispersion, as it passes through the ice.

The August event was chiefly noted for its bright, white ring. Its appearance showed how the effects of ice high above the ground can become visible in a tropical setting when the cloud cover and light allow it.

The NEA's explanation also sets out why people cannot count on a precise forecast for the next sighting. The location of the necessary crystals is difficult to predict. For residents, the August ring was a brief opportunity created by conditions that are hard to anticipate.

A moment of wonder in the middle of the day

The August halo drew attention because it combined an unfamiliar sight with an explanation rooted in an everyday substance: water, frozen into tiny crystals high in the atmosphere. Understanding the process added another dimension to the photographs, connecting the visible ring with the conditions far above Singapore.

The personal reactions showed why a weather phenomenon can mean different things to different people. Natalie Neo described a first encounter as a blessing; Ow Yong Weng Leong connected his experience with memories of his grandmother. Others found a reason to interrupt their routines and share something beautiful.

One resident expressed that feeling in a comment about seeing the halo during an ordinary day:

It was a blessing to see something so beautiful in the middle of an ordinary day.

The photographs, scientific discussions and memories gave the event a life beyond its short appearance in the sky. Residents swapped stories and images, while the unexpected ring encouraged curiosity about how light, clouds and ice can produce such a striking view.

On August 25, a phenomenon lasting from late morning into early afternoon became a shared moment across Singapore. Its appeal rested on both its appearance and its surprise, with a clear safety message accompanying the wonder: observe the ring without looking directly at the sun.

Key Points

• A sun halo appeared across Singapore on August 25, 2025, from late morning through early afternoon.
• The common 22-degree halo forms when sunlight bends through ice crystals in high clouds, typically above 5,000 metres.
• Low and middle clouds often hide halos in Singapore, and the position of the necessary ice crystals is difficult to forecast.
• Residents shared photographs from locations including Clementi, Changi General Hospital, Bedok, Serangoon Gardens and Woodlands.
• The August display followed a halo on March 15, 2025, and an earlier sighting in September 2020.
• The NEA warns that looking directly at the sun without proper protection is dangerous and can damage eyesight.