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Jeju City Weather Alert: Heavy Rainfall Forecast

September 17, 2026 · wweather1 editorial · 1 min read

Jeju City is experiencing high severity rainfall with forecast precipitation reaching 72.1 mm on September 18, 2026. This exceeds the established local threshold of 30 mm.

According to forecast data from wweather1.com, significant precipitation levels have been recorded in Jeju City, South Korea. The automated weather monitoring system triggered the alert after the rainfall metric crossed the 30 mm threshold, registering a total of 72.1 mm.

The weather event began on September 18, 2026. Local conditions reflect high severity rain for the area, prompting the automated issuance of this weather advisory.

Residents and visitors in Jeju City are advised to stay informed about ongoing weather developments through official updates and local forecasts.

Why it is dangerous and what to do

⚠️ Safety
• Monitor local weather updates and advisories closely.
• Exercise caution if traveling or commuting in the affected area.
• Ensure proper drainage around residential and commercial properties.
📊 The numbers, from wweather1 data
Jeju City: now +18°, Mostly clear.
The record for this date is +26° (2024).
Three-day forecast: 13 October: +25°/+20° · 14 October: +21°/+16° · 15 October: +21°/+13°
The figures are computed automatically from the Open-Meteo/ERA5 archive — no eyeball estimates.

🌍 Weather in nearby cities

📰 Data source: wweather1. Forecast and analysis — wweather1, based on Open-Meteo / met.no data.

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