Surviving Korea's Rainy Season (장마): A Practical Guide for International Students

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Every year, sometime between mid-June and late July, the Korean peninsula enters its monsoon season — known locally as 장마 (jangma). For international students from drier climates, this can be a genuine shock. We are not talking about occasional showers. We are talking about days — sometimes weeks — of relentless, heavy rainfall that can flood streets, shut down public transport, and turn your morning commute into a waterlogged obstacle course.

But jangma is also a defining part of the Korean experience. With the right preparation, it can be manageable and even enjoyable. This guide covers everything you need to know: when it hits, what to pack, how to stay safe, and how to make the most of the indoor season.

What Exactly Is Jangma?

Jangma is Korea's monsoon season, caused by a seasonal weather front called the 장마전선 (jangma jeonseon) — the monsoon front. This front forms when cool, dry air from the north meets warm, moist air from the south, creating a band of heavy precipitation that moves northward across the Korean peninsula.

Key Facts

• Timing: Typically mid-June to late July, lasting 30–40 days
• Regional variation: The southern coast (Busan, Jeju) enters jangma first, usually around June 19–23. Seoul and the central region follow about a week later. Northern areas enter last.
• Rainfall: Korea receives approximately 50–60% of its annual precipitation during the summer months (June–September). During jangma specifically, daily rainfall can reach 50–100mm, with extreme events exceeding 200mm in a single day.
• 2023–2025 trends: Climate change has made jangma increasingly unpredictable. The 2023 season was one of the most destructive in recent memory, with record rainfall in July causing significant flooding in Seoul, Cheongju, and surrounding areas. The 2024 and 2025 seasons also saw concentrated bursts of extreme rainfall rather than the traditionally steady pattern.

Jangma vs. Regular Rain

Regular Korean rain comes and goes. Jangma is different:

• Duration: It can rain for 3–7 consecutive days without stopping
• Intensity: Downpours during jangma are significantly heavier than typical rain
• Humidity: Even when it briefly stops raining, humidity levels reach 80–95%, making everything feel damp and sticky
• Predictability: The Korea Meteorological Administration (KMA) provides jangma forecasts, but exact start and end dates vary by 1–2 weeks each year

What to Bring and Buy

Essential Gear

Umbrella strategy: Buy a sturdy, wind-resistant umbrella. The cheap 2,000 KRW convenience store umbrellas will break within days during serious jangma winds. Invest in a mid-range umbrella (15,000–25,000 KRW) from Daiso, Artbox, or online platforms like Coupang. Many students keep two — one full-size and one compact for their bag.

Rain boots (장화): These are not optional during jangma. Water pools on sidewalks, in subway station entrances, and around campus. Options include:

• Budget: Daiso and discount stores sell basic rain boots for 10,000–15,000 KRW
• Mid-range: Brands available at ABC Mart or online for 30,000–50,000 KRW
• Trendy options: Hunter and similar brands are available at department stores, though expensive at 100,000+ KRW

Many Korean students wear short ankle-height rain boots that look like regular shoes from a distance. These are practical and do not stand out visually.

Waterproof bag or bag cover: Protect your laptop and textbooks. A simple waterproof backpack cover (5,000–10,000 KRW on Coupang) is a worthwhile investment. Some students use large Ziploc bags inside their backpacks as a low-tech solution.

Quick-dry towel: Keep a small microfiber towel in your bag. You will use it constantly — to dry off at the office, to wipe down your seat on the bus, or to dry your phone.

Waterproof phone case: Essential for using your phone in the rain for navigation. Available at most Daiso stores for 3,000–5,000 KRW.

Clothing Adjustments

• Lightweight, quick-dry fabrics: Cotton is the enemy during jangma. It absorbs water and stays wet. Switch to synthetic fabrics that dry quickly.
• Rain jacket: A lightweight, packable rain jacket is more practical than an umbrella in heavy, wind-driven rain. Uniqlo, Decathlon (available via Coupang), and outdoor brands at major department stores offer affordable options (30,000–70,000 KRW).
• Sandals with grip: Many students switch to waterproof sandals during jangma. Just make sure they have non-slip soles — wet Korean tile and marble surfaces are notoriously slippery.
• Extra socks: Always carry a spare pair in a plastic bag.

Home and Dorm Preparation

Dehumidifier or moisture absorbers: Korean homes during jangma develop mold rapidly. Options include:

• Electric dehumidifiers: 100,000–200,000 KRW for a basic model from Coupang. Effective for goshiwon or studio apartments.
• Disposable moisture absorbers (습기제거제): Available at Daiso for 1,000–3,000 KRW per pack. Place them in closets, under beds, and in bathrooms. You will be shocked at how much water they collect.
• Charcoal dehumidifying bags: A more eco-friendly option, available at larger marts.

Laundry strategy: Outdoor drying is essentially impossible during jangma. If your residence does not have a dryer, invest in a small indoor drying rack and a portable fan to circulate air around drying clothes. Many Korean students use coin laundromats with dryers during this period — expect to pay 1,000–3,000 KRW per dryer cycle.

Flooding Alerts and Safety

Understanding the Alert System

Korea has a multi-tiered emergency alert system that sends messages directly to your phone via the Emergency Alert System (긴급재난문자). You will receive these automatically — no app needed — as long as your phone has a Korean SIM card. Alerts come in Korean, though English translations are sometimes included.

The key alert levels:

• 주의보 (juuibo) — Advisory: Heavy rain expected (over 60mm in 3 hours or 110mm in 12 hours). Take precautions.
• 경보 (gyeongbo) — Warning: Severe rain expected (over 90mm in 3 hours or 180mm in 12 hours). Avoid unnecessary travel.
• 긴급 (gingeup) — Emergency: Immediate danger. Follow evacuation instructions.

Real Flooding Risks

Flooding in Korea during jangma is not theoretical. It happens every year, and it can be dangerous:

• Semi-basement apartments (반지하, banjiha): These partially underground living spaces are extremely vulnerable to flooding. The 2022 Seoul flooding killed multiple residents of banjiha apartments. If you live in one, have an evacuation plan and monitor weather alerts closely. Consider relocating during heavy jangma periods.
• Stream and river areas: Stay away from streams, rivers, and low-lying areas during heavy rain. Water levels can rise dramatically and unpredictably.
• Mountain trails: Flash flooding and landslides make mountain hiking dangerous during jangma. National parks often close trails during heavy rain periods.
• Underground shopping areas and subway stations: Most are well-protected, but some older stations in low-lying areas can experience water intrusion.

Safety Actions

1. Download the "안전디딤돌" app (Safety Stepping Stone): Korea's official disaster safety app provides real-time alerts, shelter locations, and evacuation routes. It is available in Korean, English, Chinese, and other languages.
2. Know your local shelter: Every neighborhood has designated emergency shelters. Your university's international office can provide this information.
3. Monitor KMA forecasts: The Korea Meteorological Administration website (weather.go.kr) provides English-language forecasts.
4. Avoid underground areas during extreme alerts: If a severe warning is issued, stay above ground.
5. Keep emergency supplies: Bottled water, non-perishable snacks, a flashlight, and a portable phone charger. Power outages during severe storms, while rare in major cities, are possible.

Transportation During Jangma

Subway

The subway system generally operates normally during jangma and is the most reliable transportation option. However:

• Expect crowded stations during heavy rain as people avoid buses and walking
• Some stations have slippery floors when wet — walk carefully
• Station entrances can pool water; watch your step

Buses

Buses continue to operate but may experience significant delays during heavy rain due to:

• Traffic congestion (everyone drives or takes taxis during rain)
• Flooded roads requiring route changes
• Reduced visibility for drivers

Check real-time bus tracking apps (KakaoBus or Naver Map) before heading out.

Taxis

Getting a taxi during heavy rain in Korea is notoriously difficult. Demand surges and supply drops. Tips:

• Use KakaoTaxi or Tmap Taxi apps rather than hailing on the street
• Expect surge-like wait times of 15–30+ minutes during peak rain
• Budget extra time for any rain-day appointment

Walking

Allow extra time for walking during jangma. Sidewalks flood, crosswalks become wading pools, and wind can make umbrellas useless. Korean cities generally have good drainage, but localized flooding at intersections and subway entrances is common during heavy downpours.

Indoor Activities: Making the Most of Rainy Days

Jangma can feel confining if you do not plan indoor activities. Fortunately, Korea excels at indoor entertainment:

Study Spots

• University libraries: Most remain open during jangma and are perfect for catching up on work
• Study cafes (스터디카페): Charge by the hour (1,000–2,000 KRW/hour) and offer quiet, well-lit workspaces with unlimited drinks
• Co-working spaces: More expensive but comfortable for long rain days

For more on finding the best study environments, see our guide on study tips for Korean university success.

Entertainment

• PC방 (PC rooms): Gaming cafes with high-end computers, comfortable chairs, and food service. Rates run 1,000–1,500 KRW per hour.
• Board game cafes: Great for groups of friends trapped indoors. Charge by the hour or per game.
• Indoor rock climbing: Growing in popularity, with gyms in most major neighborhoods. Day passes cost 15,000–20,000 KRW.
• Escape rooms: Korea has some of the world's best escape rooms. Prices range from 15,000–25,000 KRW per person.
• Jjimjilbang (찜질방): Spending a rainy day at a Korean spa is practically a tradition. For 12,000–15,000 KRW, you get access to saunas, heated floors, entertainment rooms, and usually a snack bar.

Cultural Activities

• Museums: Korea's major museums are free (National Museum of Korea, National Folk Museum, War Memorial). Others have discounted student admission.
• Traditional markets: Covered markets like Gwangjang Market, Namdaemun Market, and Tongin Market offer shelter and incredible food.
• Cinema: CGV, Lotte Cinema, and Megabox all offer student discounts. Morning screenings (조조할인) are cheaper, typically 6,000–8,000 KRW.

Rain-Day Food Culture

Korea has a strong association between rainy days and specific foods:

• 파전 (pajeon): Green onion pancakes. The sizzling sound of pajeon on a griddle is said to match the sound of rain. Ordering delivery pajeon during rain is a deeply Korean experience.
• 막걸리 (makgeolli): This milky rice wine is traditionally paired with pajeon on rainy days. The combination is practically mandatory.
• 칼국수 (kalguksu): Knife-cut noodle soup. Warm, comforting, and perfect for damp days.
• 수제비 (sujebi): Hand-pulled dough soup, another classic rainy day comfort food.

Embracing these food traditions during jangma will earn you genuine appreciation from Korean friends and add to your cultural experience.

Health Concerns During Jangma

Humidity-Related Issues

• Mold: Check your room regularly, especially corners, closets, and bathroom ceilings. Clean mold promptly with bleach-based products (곰팡이 제거제, available at any mart).
• Dust mites: High humidity increases dust mite populations. Wash bedding in hot water weekly during jangma.
• Food spoilage: Food spoils faster in high humidity. Refrigerate everything and check expiration dates more frequently.

Physical Health

• Athlete's foot (무좀): Extremely common during jangma due to constantly wet feet. Keep feet dry, change socks frequently, and use antifungal powder if needed. Pharmacies (약국) sell over-the-counter treatments.
• Colds and flu: The combination of air conditioning indoors and wet conditions outdoors makes summer colds common. Carry a light jacket for temperature transitions.
• Heat exhaustion: Between rain periods, summer heat and humidity can cause heat-related illness. Stay hydrated.

Mental Health

Extended rain can affect mood, especially for students from sunny climates. If you feel the effects:

• Maintain your routine as much as possible
• Use a light therapy lamp if available
• Stay socially connected — rain days are perfect for group activities indoors
• Korean university counseling centers offer free support in multiple languages

For more on mental health resources available to international students, check our guide on mental wellness apps and resources.

After Jangma: What Comes Next

Jangma typically ends in late July, but Korea's summer is not done with moisture. August and September bring:

• Post-jangma heat: The most brutal heat of the Korean summer arrives after jangma ends. Temperatures reach 33–38°C with high humidity.
• Typhoon season: September and October bring occasional typhoons that can produce intense but shorter rainfall events. The same safety precautions apply.
• Autumn transition: By mid-October, the air becomes dry and crisp. The relief is palpable.

Checklist: Jangma Survival Kit

Total essential preparation budget: approximately 50,000–100,000 KRW

Final Thoughts

Jangma is not just weather — it is a cultural season. Koreans have adapted their food, entertainment, and daily routines around it for centuries. As an international student, you have the opportunity to experience this unique aspect of Korean life firsthand. The rain will test your patience and your waterproofing, but it will also give you rainy-day pajeon memories, cozy jjimjilbang afternoons, and a deeper appreciation for the clear autumn skies that follow.

Prepare practically, stay safe, and lean into the experience. You will come out the other side with great stories and a legitimate claim to having survived Korean summer.

For more practical guidance on daily life in Korea, explore our complete guide to student life.

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