Overview
- Tuesday brought the season’s first subzero readings in parts of Gyeonggi, with Seoul at 4.8°C and Mount Seorak below freezing after Monday’s first snow.
- The KMA expects the cold snap to hold through Wednesday, with mornings below normal and daytime highs roughly 2–7°C under average.
- Forecasters tie the chill to a strong high-pressure system spreading from northern China that is funneling cold northwesterly winds across the peninsula.
- Frost and icy patches are likely in inland and mountainous areas, with black ice possible on high trails and light rain along the east coast that may turn to snow in northern Gangwon.
- A warmer September has delayed fall color, though foliage is expected to speed up later this week as clearer, colder conditions recur.