In June 2026, Hokkaido entered the season of a rare atmospheric phenomenon known in Japanese media as "night rainbows"—faint but noticeable arcs of light that appear in foggy conditions and bright moonlight. This natural phenomenon, known as a moonbow, is typically observed in tropical regions, but this year it began appearing regularly in northern Japan.

Thousands of tourists and photographers flocked to the Sapporo and Asahikawa areas, where local guides organized special night tours. Moonbows appear around midnight, when humidity is at its highest and the moon is at a certain position above the horizon. Unlike a typical rainbow, a moonbow appears almost white, but with long exposures, it reveals soft shades of blue and violet.

The 2026 season was particularly vibrant thanks to unusually humid weather and clear night skies. Tourists shared their impressions, calling the phenomenon "incredibly calm" and "almost mystical." Local hotels are reporting an increase in bookings, and tour operators have added new itineraries, including night observations, hot springs, and photo sessions.

For Hokkaido, this became one of the most unusual natural events of June, attracting the attention of international media and enthusiasts of rare atmospheric phenomena.