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South Korea Weather: Rain Expected Followed by Sharp Cooling

South Korea faces a brief spell of rain this morning followed by a sharp drop in temperatures and strong winds nationwide.

FollowinTrend Desk Oct 21, 2026, 4:30 AM 2 min read AI-assisted

A quiet city street in fall, lined with trees displaying colorful autumn leaves. — Photo: dumitru bumbu / Pexels Illustrative stock photo, not taken at the event.

Quick facts

Rainfall amounts are expected to be 5-20mm in Jeju and less than 5mm in other regions.
Coastal areas face potential strong wind advisories with gusts exceeding 20 meters per second.
Seoul's morning temperature is 14.5 degrees Celsius, with a daytime high expected to reach only 16 degrees.

Why it matters

The current weather pattern is a standard seasonal transition for the Korean peninsula, where cold air masses from the north begin to dominate as autumn progresses. The significant wind speeds reported suggest a strong pressure gradient, which often amplifies the perceived cold, commonly referred to as the wind chill effect. Residents should monitor official updates for potential wind advisories in coastal districts.

As of October 21, 2026, South Korea is experiencing a shift in weather patterns characterized by morning rain followed by a significant drop in temperatures. Residents are advised to carry umbrellas this morning and prepare for colder conditions as a cold front moves across the country.

According to YTN, rain is expected to affect central and western regions, including Seoul, as well as parts of Jeonbuk, during the morning hours. While the rain is forecasted to be brief and light, it signals the arrival of cold air from the northwest that will lead to a sharp decline in temperatures throughout the day.

Why it is trending now

The search term "오늘날씨" (today's weather) is trending due to the sudden transition from mild morning temperatures to a cold, windy afternoon. The weather transition is causing concern for commuters and outdoor activities as wind speeds increase significantly across the nation.

Key facts

The Korea Meteorological Administration expects light rain to clear by the afternoon, as reported by YTN.
Coastal regions may experience gusts exceeding 20 meters per second, with inland areas seeing winds around 15 meters per second, according to YTN.
Daytime high temperatures are forecast to struggle, with Seoul expected to reach 16 degrees Celsius and Daegu reaching 20 degrees Celsius, per YTN reporting.
The Gwangju Regional Meteorological Administration noted that daytime highs in the Gwangju and Jeonnam regions will range between 18 and 21 degrees Celsius.

Why this is trending in South Korea

The weather is a primary concern for South Koreans today as the rapid change in temperature and strong winds directly impact daily commutes and outdoor health. The significant temperature gap expected for tomorrow is prompting many to check the forecast to prepare appropriate clothing.

Background and context

South Korea typically experiences these temperature fluctuations during the transition into late autumn. The current weather system is moving from the northwest, bringing cold air that is expected to push temperatures down further by tomorrow morning.

What happens next

Following the cold air mass, meteorologists expect even colder conditions by tomorrow. Morning lows in Seoul are projected to drop to 5 degrees Celsius, marking the coldest weather of the autumn season so far for many areas. Health authorities recommend maintaining hydration and sufficient sleep to manage the sudden change in weather conditions.

Frequently asked questions

Will it rain all day in South Korea today?

No. Rain is expected primarily during the morning hours. Most regions will see the rain clear by the afternoon, though conditions will remain windy and cold for the rest of the day.

Why is it so windy today?

Strong winds are being caused by the influx of cold air from the northwest. Gusts are expected to reach 20 meters per second in coastal areas and around 15 meters per second in most other parts of the country.

Is a cold wave expected tomorrow?

Yes. Temperatures are expected to drop significantly, with morning lows in Seoul projected to reach 5 degrees Celsius, which would be the lowest temperature recorded this autumn season.

What should I wear today?

Due to the sharp drop in temperature and strong winds, it is recommended to wear warm clothing and carry an umbrella if you are heading out during the morning hours.