Tomorrow: Clear Skies in Seoul, Busan, Gangneung and Jeju; Regional Differences in Highs

Seoul: Low of 19°C, High of 30°C; 10% Chance of Precipitation

Tomorrow, Monday, September 21, 2026, Seoul is forecast to be clear. The morning low is expected to be 19°C and the afternoon high 30°C, with a 10% chance of precipitation. Precipitation is forecast at 0 mm, so rain is unlikely. Humidity is expected to be 25%, making for a dry day, with temperatures ranging from a low of 19°C to a high of 30°C under clear skies.

Clear Skies in Busan, Gangneung and Jeju; Highs Vary by Region

In Busan, clear conditions are expected on Monday, September 21, with a morning low of 19°C, an afternoon high of 28°C, a 10% chance of precipitation and 0 mm of precipitation. Gangneung is also expected to be clear, with a low of 16°C, a high of 25°C, a 10% chance of precipitation and 0 mm of precipitation. Jeju is expected to be clear as well, with a low of 20°C, a high of 26°C, a 10% chance of precipitation and 0 mm of precipitation. A cold front is expected to lie over areas near Busan, Gangneung and Seoul from overnight through tomorrow evening, while a pressure ridge is expected to be located near Jeju during the same period.

Seoul Temperatures by Time: High of 30°C at 3 p.m.

Seoul temperatures are forecast at 19°C at 6 a.m., 24°C at 9 a.m., 29°C at noon, 30°C at 3 p.m., 27°C at 6 p.m. and 23°C at 9 p.m. The chance of precipitation is 10% at all of those times, and hourly precipitation is forecast at 0 mm. Humidity is expected to vary by time: 78% at 6 a.m., 58% at 9 a.m., 30% at noon, 25% at 3 p.m., 32% at 6 p.m. and 56% at 9 p.m.