South Korea Weather Update: Morning Chill and Daytime Heat with Large Temperature Swings

South Korea is experiencing a period of extreme diurnal temperature variation on August 11, 2026, with morning lows dropping to 19 degrees Celsius while daytime highs reach 34 degrees Celsius. According to reports from News1 and KBS, this pattern persists as the region transitions away from a previous “double heat dome” effect, though intense heat remains concentrated in the capital and southern regions.

The Korea Meteorological Administration and local reports indicate that while the overarching heat dome has weakened, the impact of “triple typhoons” is being monitored for potential influence on the peninsula’s weather patterns. This atmospheric shift has resulted in a sharp contrast between nighttime coolness and daytime heat.

Regional Temperature Variations and Tropical Nights

Seoul is expected to reach a high of 34 degrees Celsius on August 11, according to Asia Economy. The city, along with various coastal areas and urban centers, continues to experience tropical nights, where minimum temperatures do not drop below 25 degrees Celsius.

In contrast, higher altitude and inland regions are seeing a more significant break from the heat. Yonhap News reports that Taebaek recorded a morning temperature of 16 degrees Celsius on Tuesday, August 12, signaling a departure from the extreme heatwave for those specific areas.

KBS News reports that while the heat continues to grip the Seoul metropolitan area and the southern provinces, the intensity of nighttime heat is beginning to subside in several regions, contributing to the widening gap between daily highs and lows.

Drought Concerns Amidst Heatwave Shift

Despite the localized drop in temperatures in regions like Taebaek, the broader environmental impact remains critical. Yonhap News reports that while these areas are escaping the immediate grip of the heatwave, drought conditions are actually intensifying.

Atmospheric Drivers and Forecast

The current volatility in temperature is attributed to the collapse of the “double heat dome” structure. News1 reports that this collapse allowed morning temperatures to plummet as low as 17 degrees Celsius in certain areas, creating a stark contrast to the 34-degree peaks seen during the day.

Meteorologists are currently analyzing the influence of three active typhoons in the Pacific.