Nationwide Clear Today, Turning Cloudy Tonight... Rain Expected Nationwide Tomorrow, with Jeju Seeing Up to 60mm

On Saturday, October 31, 2026, skies across the nation will be generally clear before gradually turning cloudy from the night onward. While clear weather will persist during the day, temperatures are expected to drop and winds to strengthen as cold air descends from the north starting in the afternoon, leading to continued chilly conditions ¹. Rain is scheduled to fall across most of the country on Sunday, November 1, with particularly heavy rainfall expected in Jeju Island, where up to 60 mm is forecast, requiring caution ¹. Today, there are precautions to take despite the clear weather, such as large diurnal temperature variations and dry air, while for tomorrow, it is advisable to check the path of the rain cloud band and precipitation amounts in advance when planning outings.

Temperatures Begin to Drop from This Afternoon, Turning Cloudy from the Night

Currently, during the day on October 31, the entire country is experiencing generally clear weather. According to forecasts from the Korea Meteorological Administration (KMA), daytime temperatures today will be about 1 to 6 degrees Celsius lower than the previous day. The expected daytime high temperatures for major areas are 15°C in Seoul, 18°C in Daejeon, and 21°C in Jeonju ¹. Starting in the afternoon, temperatures will gradually begin to fall as cold air moves south from the north, and due to this change in pressure systems, the entire country will transition to overcast conditions from the night onward ¹.

The combination of clear weather, dropping temperatures, and strong winds can result in a lower effective feel of the temperature. In particular, the Yeongnam region is experiencing a significant difference between daytime and nighttime temperatures, requiring attention to health care ¹. Additionally, the atmosphere is very dry in the Gangwon Yeongdong and Gyeongbuk east coast regions, requiring special care to prevent fires such as wildfires ¹. Until rain falls, caution must be exercised when handling fire sources during hikes or outdoor activities in these areas.

Tomorrow, November 1: Rain Expands Nationwide from Morning to Night

After the clear skies disappear, Sunday, November 1, will see generally overcast skies across the nation. Rain will begin in some areas in the morning and is expected to expand to most of the country by night ¹.

The start time of the rain varies by region. According to weather forecasts, rain will begin in the southwestern part of Gyeonggi Province and the Chungcheong region in the morning. In the afternoon, the rain cloud band will expand to the southern regions and Jeju Island, and by night, rain is expected to fall across most of the country, including the Seoul Metropolitan Area such as Seoul, Incheon, and Gyeonggi Province ¹. This shows a pattern where rain starts first in the western inland and central regions, gradually expanding southeastward and toward the capital area. Therefore, even in areas where it is not raining in the morning, an umbrella may be necessary as the day progresses into the evening and night.

Up to 60 mm of Rain in Jeju Island, Caution for Strong Rain of 20 mm per Hour

Jeju Island is the region expected to concentrate the heaviest rainfall tomorrow. The expected precipitation for Jeju Island from November 1 to 2 is 10 to 60 mm, forecasted to be the highest amount of rain in the country ¹. In particular, from the night of the 1st, there is a high possibility of strong rain of around 20 mm per hour, requiring special care for facility management and safety accidents ¹.

A precipitation rate of 20 mm per hour is a level where roads can become wet or visibility can be reduced in a short amount of time. Travelers visiting Jeju Island and local drivers are advised to maintain safe following distances and adjust speed when driving at night. The expected precipitation for major regions nationwide from November 1 to 2 is categorized as follows ¹.

The capital area and Gangwon inland regions are expected to have relatively low rainfall of around 5 mm. However, roads may be slippery while it is raining, so caution should be exercised when traveling.

Medium-Term Outlook: Temperatures to Drop Further After November 7

Even after the rain ends, attention needs to be paid to temperature changes. According to the medium-term forecast announced by the KMA at 6:00 AM on October 31, 2026, from Wednesday, November 4, to Friday, November 6, morning temperatures are expected to range from 4 to 14 degrees Celsius and daytime temperatures from 12 to 19 degrees Celsius, similar to or slightly lower than the average year ².

From the afternoon of Friday, November 6, cold air will move south from the northwest, causing temperatures to drop. Accordingly, from Saturday, November 7, to Tuesday, November 10, morning temperatures are forecasted to range from 0 to 8 degrees Celsius and daytime temperatures from 10 to 16 degrees Celsius, lower than the average year ². In particular, during this forecast period, some inland areas will experience a large difference between daytime and nighttime temperatures of over 10 degrees Celsius, requiring attention to health care ². Also, rain is forecasted for Jeju Island on Thursday, November 5, but since the timing and area of precipitation may change depending on surrounding pressure system changes such as the development, location, and speed of the trough, it is recommended to refer to the latest forecasts ².

Reference Matters for Weekend Outings and Next Week’s Preparations

Considering the weather characteristics of October 31 and November 1, the following matters can be referenced.

1. Maintain Body Temperature and Be Cautious of Fire: From the afternoon of the 31st, cold air will flow in and winds will strengthen, potentially causing a sharp drop in perceived temperature, so it is advisable to bring an outer garment. Additionally, care must be taken to manage sparks in the dry Gangwon Yeongdong and Gyeongbuk east coast regions.
2. Check Umbrellas and Transportation: On Sunday, November 1, rain will expand to nationwide areas from morning to night, so it is advisable to bring an umbrella when going out. Strong rain is expected in Jeju Island from the night, so caution is required when moving.
3. Prepare for Cold Next Week: Temperatures are forecasted to drop from the afternoon of November 6, and morning temperatures are expected to fall after November 7 ². Particularly, diurnal temperature variations are expected to be large in inland areas, so it is wise to prevent seasonal transition diseases and wear appropriate clothing next week.