Seoul Tropical Nights Streak Ends After 17 Days as Temperatures Drop

Seoul’s morning low temperature dropped to 24.5 degrees Celsius on August 9, according to the Korea Meteorological Administration, finally bringing an end to an unprecedented 17-day consecutive streak of tropical nights across the South Korean capital. A tropical night is officially defined by the weather agency as a phenomenon where the mercury does not fall below 25 degrees Celsius between 6:01 p.m. and 9:00 a.m. the following morning.

Understanding the End of Seoul’s Historic Heatwave

The record-breaking heat wave gripped the city through late July and early August, keeping nighttime temperatures abnormally high and disrupting sleep for millions of residents. According to the Korea Meteorological Administration, the 17-day streak is among the most persistent periods of nocturnal heat recorded in the capital’s modern meteorological history. Meteorologists attribute these extreme nighttime lows to persistent humidity and warm southerly winds trapping heat over the metropolitan basin.

When temperatures finally dipped below the 25-degree threshold on the morning of August 9, it provided a temporary reprieve from the relentless air conditioning demand that had strained the nation’s power grid. City officials reported a sharp increase in emergency room visits for heat-related illnesses during the peak of the tropical night streak, particularly among elderly populations and outdoor laborers.

Climate Context and Future Temperature Trends

Urban climatologists note that concrete-heavy urban heat island effects significantly amplify nighttime temperatures in Seoul compared to surrounding rural areas. According to historical climate data published by the Korea Meteorological Administration, the frequency of tropical nights in the capital has steadily increased over the past decade, aligning with broader global warming trends.

While the August 9 drop brought brief relief, government weather forecasters warn that late-summer heat domes could still trigger additional spikes in temperature before the autumn season officially begins. Residents are advised to continue monitoring daily weather bulletins issued by the Korea Meteorological Administration for real-time updates on heat advisories and humidity levels.