October is one of the most pleasant months to visit South Korea, but it can also be surprisingly changeable depending on the region and the time of month. In general, Korea weather in October / what to wear in October in Korea is all about mild afternoons, cooler mornings and evenings, and a growing difference between inland and coastal cities. Early October can still feel quite warm in some parts of the country, while late October often brings a much sharper autumn chill, especially in northern and inland areas.
One of the most noticeable patterns in October is the wide daily temperature range. You may step outside in comfortable sunshine during the afternoon, then need a much warmer layer after sunset. Rain can also play an important role, especially in certain coastal areas where autumn weather becomes wetter and windier than many travelers expect. Because of that, it is important to prepare flexible outfits instead of relying on just one type of clothing.
For most travelers, the best strategy is layering. Light long sleeves, shirts, cardigans, and jackets work especially well, and in some cities a rainproof outer layer becomes very useful. If you are planning to move between Seoul, the east coast, the southeast, and Jeju, you will quickly notice that October does not feel exactly the same everywhere, which is why understanding regional weather patterns can make your trip much easier and more comfortable.
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Click on the city you’re curious about to see Korea weather in October
Korea weather in October – Seoul
Korea weather in October– Seoul is located in the inland northwestern part of South Korea, which means it cools down faster than the southern coastal cities as autumn deepens. Because it sits farther north, the drop in temperature becomes much more noticeable in the second half of October. The city often feels mild and comfortable during the day but much colder in the early morning and late evening. By late October, Seoul can begin to feel like a transition zone between autumn and early winter.
Week 1
October opened with fresh and comfortable autumn weather in Seoul. The highest temperature reached 25.8°C (78.4°F), while the lowest dropped to 16.7°C (62.1°F). A light rainfall of 0.8mm arrived on October 3, but it did little to disrupt travel plans. Overall, the city felt mild and pleasant for walking, sightseeing, and enjoying early fall scenery.
Week 2
The second week turned warmer but much wetter across the city. The highest temperature reached 28.0°C (82.4°F), while the lowest stayed around 15.0°C (59.0°F). Heavy rainfall arrived repeatedly, including 36.8mm on October 6, 49.3mm on October 10, and 22.5mm on October 11. The atmosphere felt unusually damp for October, and travelers likely needed both an umbrella and a light jacket.
Week 3
The third week brought slightly cooler air and continued cloudy conditions. The highest temperature reached 25.3°C (77.5°F), while the lowest dropped to 13.9°C (57.0°F). Rainfall continued with 25.1mm on October 13 and additional light showers during the week. The weather felt more distinctly autumn-like, though still soft rather than sharply cold.
Week 4
The fourth week marked the beginning of a much stronger temperature drop. The highest temperature reached around 20.0°C (68.0°F), while the lowest fell significantly and eventually dropped to 3.7°C (38.6°F) on October 27. Rainfall was very limited, with only 0.5mm reported on October 26. The overall feeling shifted from cool autumn weather to something much closer to early winter in the mornings.
Week 5
The final days of October stayed crisp and noticeably colder than the beginning of the month. The highest temperature remained near 18.0°C (64.4°F), while the lowest stayed in the single digits around 5.0°C (41.0°F). Rainfall was minimal at under 1mm, so skies were generally clearer and drier. Travel conditions were still enjoyable, but warm layers became much more necessary, especially after sunset.
Summary & What to Wear in October in Korea (Seoul)
Seoul in October begins with mild fall weather but turns much colder by the final week. The biggest travel challenge is not extreme weather, but the sharp swing between daytime comfort and chilly mornings and evenings. In early and mid-October, a shirt, blouse, or light knit with a jacket usually works well. By late October, travelers should add warmer layers such as a thicker coat, fleece, or light padded jacket.
Korea weather in October – Gangneung
Korea weather in October – Gangneung is located on Korea’s eastern coast, where both the East Sea and the Taebaek Mountains shape local weather patterns. This region can become especially wet in autumn when easterly winds push moisture inland. Compared with inland cities, Gangneung often feels windier and more changeable. Even when temperatures do not look extremely low on paper, the combination of rain and sea breeze can make it feel much colder.
Week 1
The month started on a relatively mild and gentle note in Gangneung. The highest temperature reached 27.9°C (82.2°F), while the lowest dropped to 17.9°C (64.2°F). Light rainfall under 1mm fell on both October 3 and October 4. The weather felt calm and soft overall, though the dampness hinted that a wetter pattern was coming.
Week 2
The second week became dramatically wetter and more unsettled. The highest temperature reached 24.9°C (76.8°F), while the lowest stayed near 15.0°C (59.0°F). Heavy rain arrived throughout the week, including 77.5mm on October 6 and 33.0mm on October 7. The city felt soggy, windy, and much cooler than travelers might expect from early October.
Week 3
The third week was even more striking, with rain falling every single day. The highest temperature reached just 19.6°C (67.3°F), while the lowest dropped to 13.3°C (55.9°F). Rainfall remained very heavy, including 48.6mm on October 13 and 46.4mm on October 18. Because of the constant rain and coastal wind, the overall atmosphere felt raw, chilly, and deeply autumnal.
Week 4
The fourth week continued with frequent rain until about October 24. The highest temperature reached around 18.0°C (64.4°F), while the lowest dropped further and eventually reached 6.6°C (43.8°F) on October 27. Rainfall remained present through much of the week, though it eased compared with the earlier downpours. The city felt damp and cold at first, then clearer and noticeably crisper once the skies finally opened.
Week 5
The final days of October brought calmer and drier weather to Gangneung. The highest temperature hovered near 17.0°C (62.6°F), while the lowest stayed around 7.0°C (44.6°F). Rainfall dropped to very low levels, staying near 0mm for much of the closing stretch. Travel felt much easier by this point, but the air had turned cool enough for proper autumn outerwear.
Summary & What to Wear in October in Korea (Gangneung)
Gangneung had one of the wettest and most unstable October patterns among these cities. Rain, wind, and falling temperatures made the month feel colder than the numbers alone suggest. Travelers should pack a waterproof jacket, windproof outer layer, and shoes that can handle wet streets. Layering with sweaters or fleece is especially useful here because the coastal air can feel sharp after rainfall.
Korea weather in October – Jeju
Korea weather in October – Jeju is Korea’s southern island and has the mildest climate among the cities in this guide. Surrounded by the sea, it holds onto warmth much longer than mainland inland regions. October in Jeju can still feel like late summer during the daytime, especially in the first half of the month. At the same time, coastal wind can make the air feel cooler than expected once the sun goes down.
Week 1
October opened with warm island weather and a humid start. The highest temperature reached 28.8°C (83.8°F), while the lowest dropped to 19.3°C (66.7°F). A heavy rainfall event of 65.5mm arrived on October 3. Even with that rain, the overall feeling remained soft, warm, and very manageable for travel.
Week 2
The second week stayed bright and pleasantly warm. The highest temperature reached 28.9°C (84.0°F), while the lowest remained around 18.0°C (64.4°F). Rainfall was almost nonexistent, with only 0.9mm reported on October 7. The city felt clear, sunny, and much more like late summer than deep autumn.
Week 3
The third week was especially warm for mid-October. The highest temperature climbed to 31.0°C (87.8°F), while the lowest stayed near 19.0°C (66.2°F). Intermittent rainfall appeared on October 14, 17, and 18, though totals remained moderate. The overall atmosphere felt bright, warm, and perfect for active outdoor travel.
Week 4
The fourth week brought a more noticeable seasonal shift, though Jeju still stayed mild. The highest temperature reached 23.6°C (74.5°F), while the lowest later dropped to 11.6°C (52.9°F) on October 28. Rainfall was limited and much less disruptive than earlier in the month. The island felt cooler and breezier, but still far more comfortable than colder mainland cities.
Week 5
The final days of October remained calm and pleasantly cool. The highest temperature stayed around 22.0°C (71.6°F), while the lowest hovered near 12.0°C (53.6°F). Rainfall stayed minimal at close to 0mm for much of the closing period. Travel conditions felt crisp, dry, and ideal for scenic autumn outings.
Summary & What to Wear in October in Korea (Jeju)
Jeju stays warm much longer than most parts of Korea, and early to mid-October can still feel hot during the day. Late October becomes cooler, but the island remains one of the most comfortable autumn destinations in the country. In the daytime, light clothing such as T-shirts or thin shirts may still be useful, especially early in the month. A cardigan, windbreaker, or light jacket is still important because coastal breezes can make evenings feel cooler.
Korea weather in October – Gyeongju
Korea weather in October– Gyeongju lies in the southeastern inland basin of Korea, and its geography creates large daily temperature swings in autumn. Heat tends to linger during the day, especially in early October, but nighttime cooling can become quite strong. This means travelers may feel almost summer-like warmth at noon and a much colder atmosphere after sunset. The city’s inland setting makes layering especially important for visitors exploring outdoor historical sites.
Week 1
October began with warm afternoons and a noticeable day-to-night contrast. The highest temperature reached 28.1°C (82.6°F), while the lowest dropped to 14.7°C (58.4°F). Rainfall reached 21.0mm on October 3, bringing a wet interruption to an otherwise bright start. The overall feeling was warm for sightseeing during the day but cooler once evening arrived.
Week 2
The second week was unusually warm for October in Gyeongju. The highest temperature climbed all the way to 30.6°C (87.1°F), while the lowest stayed around 15.0°C (59.0°F). Rainfall appeared on October 6 and 7, though totals were lighter than in some other cities. The weather felt almost like lingering summer during the day, especially in exposed historic areas.
Week 3
The third week turned gentler but still showed the city’s wide temperature range. The highest temperature reached 24.9°C (76.8°F), while the lowest dropped to 15.2°C (59.4°F). Rainfall centered around October 14, when 25.9mm fell, along with other periodic showers. The atmosphere felt softer and more clearly autumnal, though daytime walking conditions remained comfortable.
Week 4
The fourth week brought the sharp seasonal shift that had been building all month. The highest temperature reached around 20.0°C (68.0°F), while the lowest plunged to 3.0°C (37.4°F) on October 27. Rainfall was very limited and mostly absent through this period. The air felt clear and dry, but mornings suddenly became cold enough to surprise unprepared travelers.
Week 5
The final days of October remained cool and much more stable. The highest temperature stayed near 19.0°C (66.2°F), while the lowest remained in the low single digits around 5.0°C (41.0°F). Rainfall stayed close to 0mm, leaving conditions mostly dry and bright. Travel felt excellent in the daytime, but evenings required distinctly warmer clothing.
Summary & What to Wear in October in Korea (Gyeongju)
Gyeongju in October is defined by dramatic daily temperature differences and a late-month cold snap. Early October can still feel surprisingly warm, while late October mornings may feel close to winter. The best clothing strategy here is layering, with light innerwear for daytime and a cardigan, knit, or light padded jacket for evenings. Comfortable walking clothes are also important because many of Gyeongju’s major sights are outdoors.
Korea weather in October – Busan
Korea weather in October – Busan sits on Korea’s southeastern coast and benefits from the moderating influence of the sea. Because of this maritime effect, temperature swings are generally less extreme than in inland cities such as Seoul or Gyeongju. October in Busan often stays pleasantly mild for much of the month. Even when cooler air begins to arrive late in the season, the city usually remains more comfortable than colder inland destinations.
Week 1
The first week began warm and inviting in Busan. The highest temperature reached 29.3°C (84.7°F), while the lowest dropped to 18.9°C (66.0°F). A very heavy rainfall event of 70.7mm arrived on October 3. Aside from that burst of rain, the city still felt lively, bright, and easy to enjoy for coastal travel.
Week 2
The second week settled into classic mild autumn weather. The highest temperature reached 28.9°C (84.0°F), while the lowest stayed around 18.8°C (65.8°F). Rainfall was very light, with only 2.3mm reported on October 6. The overall atmosphere felt warm, relaxed, and comfortable for walking along the beach or city streets.
Week 3
The third week remained steady and pleasant. The highest temperature reached 27.7°C (81.9°F), while the lowest dropped to 18.3°C (64.9°F). Rainfall returned in modest amounts, including 21.5mm on October 16 and 11.3mm on October 18. Even with those showers, the city kept its mild and travel-friendly feel.
Week 4
The fourth week finally introduced a more obvious autumn coolness. The highest temperature reached 23.7°C (74.7°F), while the lowest later dropped to 7.7°C (45.9°F) on October 28. Rainfall remained limited, so skies were generally calmer than earlier in the month. The city felt fresher and cooler, but still gentler than most inland areas.
Week 5
The final days of October stayed comfortably cool in Busan. The highest temperature remained near 21.0°C (69.8°F), while the lowest hovered around 10.0°C (50.0°F). Rainfall was minimal and stayed close to 0mm. The overall feeling was calm, crisp, and very suitable for relaxed autumn travel.
Summary & What to Wear in October in Korea (Busan)
Busan has one of the easiest October climates for international travelers. Most of the month stays mild, comfortable, and less extreme than inland cities, although late October evenings can still turn cool. Light autumn clothing such as long sleeves, jeans, sweatshirts, and a light jacket usually works well. A heavier coat is not essential for most of the month, but an extra layer is still useful near the coast at night.
This has been Seoul Mate Lenny, sharing a closer look at Korea’s weather across different cities. I hope this guide helps anyone planning a trip to Korea better understand the climate and prepare for their journey.