Temperatures to hit 33 C in greater Seoul on Tuesday as Typhoon Jangmi pushes hot winds north

Rain is forecast for Jeju and southern regions Monday and Tuesday as Typhoon Jangmi, the sixth named storm of the season, tracks northeast from southwest of Japan's Okinawa.

As the typhoon's southeasterly winds cross mountain ranges and turn hot and dry, temperatures in the Greater Seoul area are expected to exceed 33 degrees Celsius on Tuesday — midsummer-level heat.

According to the Korea Meteorological Administration and Yonhap News Agency, Typhoon Jangmi was passing through waters about 250 kilometers south-southwest of Okinawa at around 9 a.m. Monday, moving northeast. The storm was rated intensity level 2 (moderate) and was expected to strengthen to level 3 (strong) by Monday evening.

As Jangmi passes through seas southeast of Japan, it will funnel hot, humid southeasterly winds toward the Korean Peninsula.

Warm, moist air is being driven forcefully through a narrow corridor between the typhoon and the North Pacific High sitting to Japan's southeast, while an upper-level trough passes overhead — conditions expected to bring heavy rain centered on Jeju and the southern coast.

Rain will begin falling on Jeju first, spreading to South Jeolla Province and South Gyeongsang Province by Monday night.

By early Tuesday, rain will extend to North Jeolla Province and southern North Gyeongsang Province, before tapering off — in North Jeolla Province during the morning, and in South Jeolla Province, southern North Gyeongsang Province, South Gyeongsang Province and Jeju during the afternoon.

Expected rainfall totals are: Jeju, 30–80 millimeters (150 mm or more in mountainous areas, 120 mm or more in other heavy-rain zones); Gwangju, South Jeolla Province, Busan, Ulsan and South Gyeongsang Province, 20–60 mm (80 mm or more in southern South Jeolla Province, Busan, the southern coast of South Gyeongsang Province and its southwestern inland areas); southern North Jeolla Province, 5–20 mm; Daegu and southern North Gyeongsang Province, 5–10 mm; and northern North Jeolla Province, around 5 mm.

From Monday night through Tuesday morning, when the influence of the upper-level trough intensifies, downpours of 20–30 millimeters per hour are possible around Jeju and the southern coast — residents should take precautions against potential damage.

The typhoon will also whip up rough seas to the south.

Winds of 30–60 kilometers per hour (8–16 meters per second) and waves of 1.5–4.0 meters are expected across multiple maritime zones — already from early Monday in the outer southern waters of Jeju and the outer eastern waters of the South Sea; from Monday afternoon in the remaining Jeju waters (excluding the northern inshore zone) and the eastern outer western South Sea; from Tuesday morning in the inner eastern South Sea; and from Wednesday night in the southern East Sea. Waves in the outer southern Jeju waters and outer eastern South Sea could reach 5.0 meters or higher on Tuesday.

A gale warning was issued for the outer eastern South Sea on Monday night and is expected to be upgraded to a typhoon warning by early Tuesday.

Once a typhoon warning is issued, Typhoon Jangmi will be officially classified as a typhoon affecting South Korea.

If that classification is confirmed, it would be the first typhoon to affect the country in about one year and 10 months, since Typhoon Shanshan in August 2024.

Last summer, strong high-pressure systems — including the North Pacific High — held firm over the Korean Peninsula, preventing typhoons from tracking far enough north to affect the country.

Strong swells are surging into the Jeju and southern coastlines, with waves expected to wash over rocky shores and breakwaters — the public is advised to stay away from coastal areas.

Northwestern parts of the country, including the Greater Seoul area, will see temperatures climb further due to the southeasterly winds off the typhoon. The warming is driven by the foehn effect, in which air heats up and dries out as it descends after crossing mountain ranges.

Daytime highs in Seoul and surrounding areas are forecast to reach 33 C on Tuesday.

However, a heat advisory is not expected to be issued. Humidity levels are not high enough for the apparent temperature to match the actual reading, and a pressure trough passing north of the country on Thursday is forecast to bring showers to central inland areas and pull temperatures back down to seasonal norms.

A heat advisory is issued when the daily maximum apparent temperature is forecast to reach 33 C or higher for two or more consecutive days.

Meanwhile, the KMA has forecast that South Korea's average annual temperature in 2026 will run above normal. Since mid-May, unseasonably early heat has already struck across the country, with temperatures exceeding 30–35 C in multiple locations — including 35.9 C in Gyeongju, 34.5 C in Samcheok and 33.6 C in Donghae.

엔비디아 ‘6%’ 급등…뉴욕증시 또 사상 최고치 마감

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