Best Time to Visit Korea

Photo by Yohan Cho on Unsplash

Late April through May and the month of November are the two windows where Seoul's weather stops working against you. May runs 21.6°C / 70.9°F by day and 12.2°C / 54.0°F at night with 102.9mm (4.05in) of rain spread over 9 days, and November is the driest month on record here — 16.3mm (0.64in) across just 2 rainy days, with highs of 12.3°C / 54.1°F. Everything between late June and the end of September is either hot, wet, or both: July hits 32.3°C / 90.1°F, and September dumped 298.1mm (11.74in) of rain, the wettest month of the year.

All figures below are measured 2025 data for Seoul. One year is not a climate average, so treat the rain-day counts as a strong signal rather than a guarantee — 2025's autumn was unusually wet, and that shows up clearly in the numbers.

The best months: late April, May, and November

May is the single most comfortable month in the table. Highs of 21.6°C / 70.9°F mean you can walk from Gyeongbokgung to Bukchon without sweating through a shirt, and lows of 12.2°C / 54.0°F mean a light jacket after sunset — not a coat. The 102.9mm (4.05in) of rain falls over 9 days, averaging about 11mm per rainy day. That is real rain, not mist, but it is nine days out of thirty-one; on the other twenty-two you get nothing.

April is cooler and colder at night than people expect. Highs reach 17.4°C / 63.3°F, but lows drop to 6.3°C / 43.3°F. April is also deceptively wet in a specific way: 103.4mm (4.07in) fell over only 6 days. That is roughly 17mm per rainy day — the second-heaviest per-event rain of the entire year. April rain arrives as a few big soakings, not a damp month. If you are here for cherry blossoms, that matters: one heavy April day can strip the trees.

November is the quiet winner and almost nobody picks it. Highs of 12.3°C / 54.1°F with lows of 3.1°C / 37.6°F make it a genuine coat month, but the rain figure is remarkable: 16.3mm (0.64in) over 2 days. That is one-sixth of May's rainfall. Fourteen consecutive dry days in November are normal. Combined with autumn foliage in the mountains and thinner crowds, it is the best month of the year if you own a warm jacket and don't mind an early sunset.

Months to avoid: July, August, and September

July is the worst combination on the table: 32.3°C / 90.1°F daytime highs, 24.4°C / 75.9°F overnight lows, and 234.5mm (9.23in) of rain over 14 days. The overnight low is the part people underestimate. When the night floor is 24.4°C / 75.9°F, the city never cools down — you wake up warm, and the humidity that comes with monsoon rain makes it worse. Fourteen rain days delivering 234.5mm works out to roughly 17mm per rainy day, which is downpour territory: sudden, hard, often over within an hour or two. It is not all-day drizzle, but you will get caught.

August is marginally cooler at 30.9°C / 87.6°F with lows of 24.0°C / 75.2°F, but rains on more days: 204.7mm (8.06in) across 16 days. Half the month has rain in it. On paper August's storms are gentler than July's (about 13mm per rainy day) but the sheer frequency means outdoor plans need a fallback every single day.

September is the trap month. The temperature reads beautifully — 26.2°C / 79.2°F highs, 19.2°C / 66.6°F lows, the kind of numbers that say "early autumn." Then you look at the rain: 298.1mm (11.74in), the highest of the year, concentrated into only 11 days. That is about 27mm per rainy day, by far the most intense rainfall of any month. September rain in 2025 came as a small number of severe events, typically typhoon-driven. If you travel in September, expect a couple of days where going outside is simply off the table, plus disrupted domestic flights and ferries to Jeju.

January and February are avoidable for the opposite reason. January averages a high of 2.0°C / 35.6°F and a low of −5.3°C / 22.5°F; February is slightly colder at night, −6.5°C / 20.3°F, with a high of 2.3°C / 36.1°F. Neither is dangerous, but the high never gets above freezing by much, and the wind off the Han River makes it feel worse than the number. February is also the driest month of the year at just 4.5mm (0.18in) over 2 days — so if you are here for winter, at least you won't be rained on.

Shoulder season: March, June, and early December

March is the cheapest of the genuinely usable months. Highs of 11.6°C / 52.9°F with lows of 1.1°C / 34.0°F mean it is still cold — near-freezing at dawn — but 44.8mm (1.76in) over 8 days is modest. March is the month before cherry-blossom pricing kicks in, and the difference in accommodation cost between mid-March and early April in Seoul is substantial. Bring the same coat you'd bring for November and you'll be fine.

June is the last usable month before the monsoon takes over, and only the first half of it. Highs of 28.1°C / 82.6°F and lows of 19.3°C / 66.7°F are warm but manageable, and June's 100.6mm (3.96in) is spread over 13 days — roughly 8mm per rainy day, the lightest per-event rain of any wet month. That is drizzle and short showers, not the July hammering. The catch is that the rainy season typically arrives during June, so early June behaves like May and late June behaves like July.

December sits between shoulder and winter. Highs of 3.4°C / 38.1°F, lows of −4.3°C / 24.3°F, and 45.9mm (1.81in) over 9 days — and at that temperature a meaningful share of that falls as snow. December is worth it only if snow-covered palaces and near-empty tourist sites are the point.

What each season actually means for your trip

Spring (March–May). Layers, not bulk. April's 11°C swing between 17.4°C / 63.3°F day and 6.3°C / 43.3°F night means you carry a jacket you take off by 11am and put back on at 6pm. A compact umbrella earns its space in April specifically because that month's rain is heavy and concentrated. You'll be doing long walking days: palace grounds, Bukhansan trails, Jeonju's hanok village — all outdoor-dependent and all fine in this window.

Summer (June–August). Plan the day around indoor anchors. With July at 32.3°C / 90.1°F and August raining on 16 days, the realistic pattern is museums, department-store basements, cafés, and the subway between 1pm and 5pm, with outdoor time in the early morning and after 7pm. Pack for humidity: quick-dry fabrics, a second shirt for the afternoon, sandals you don't mind soaking. A cheap folding umbrella from any convenience store beats a rain jacket — a waterproof shell at 30°C / 86°F just traps sweat.

Autumn (September–November). Two different seasons wearing the same name. September is summer with typhoons attached. October cools sharply to 19.4°C / 66.9°F days and 12.2°C / 54.0°F nights but rained on 14 days in 2025 for 158.8mm (6.25in) — wetter than its reputation. November is the payoff: cold, bright, and effectively dry. For November you want a proper insulated jacket, since 3.1°C / 37.6°F nights are cold enough to end an evening early otherwise.

Winter (December–February). A serious coat, gloves, and a hat, not a fashion coat. With February lows at −6.5°C / 20.3°F, exposed skin gets uncomfortable in under fifteen minutes of walking. The upside: January and February together produced 23.8mm (0.94in) of precipitation across 6 days, so your outdoor time is rarely rained out — it is just cold. Heated floors, jjimjilbang, and indoor markets exist for exactly this reason.

Month-by-month

• January — 2.0°C / 35.6°F high, −5.3°C / 22.5°F low, 19.3mm (0.76in) over 4 days. Cold and dry; ski season.
• February — 2.3°C / 36.1°F high, −6.5°C / 20.3°F low, 4.5mm (0.18in) over 2 days. Coldest nights of the year, driest month of the year.
• March — 11.6°C / 52.9°F high, 1.1°C / 34.0°F low, 44.8mm (1.76in) over 8 days. Thaw begins; best value of any comfortable month.
• April — 17.4°C / 63.3°F high, 6.3°C / 43.3°F low, 103.4mm (4.07in) over 6 days. Blossom season; rain comes in a few hard hits.
• May — 21.6°C / 70.9°F high, 12.2°C / 54.0°F low, 102.9mm (4.05in) over 9 days. The most comfortable month overall.
• June — 28.1°C / 82.6°F high, 19.3°C / 66.7°F low, 100.6mm (3.96in) over 13 days. Frequent but light rain; monsoon arrives mid-month.
• July — 32.3°C / 90.1°F high, 24.4°C / 75.9°F low, 234.5mm (9.23in) over 14 days. Hottest and second-wettest. Avoid.
• August — 30.9°C / 87.6°F high, 24.0°C / 75.2°F low, 204.7mm (8.06in) over 16 days. Rain on more than half the days.
• September — 26.2°C / 79.2°F high, 19.2°C / 66.6°F low, 298.1mm (11.74in) over 11 days. Pleasant temperatures, wettest month of the year.
• October — 19.4°C / 66.9°F high, 12.2°C / 54.0°F low, 158.8mm (6.25in) over 14 days. Good temperatures, wetter than its reputation.
• November — 12.3°C / 54.1°F high, 3.1°C / 37.6°F low, 16.3mm (0.64in) over 2 days. Cold, dry, uncrowded — the underrated pick.
• December — 3.4°C / 38.1°F high, −4.3°C / 24.3°F low, 45.9mm (1.81in) over 9 days. Winter proper; some of that falls as snow.

FAQ

What is the rainy season in Korea and exactly when does it hit?

The monsoon dominates July and August. July recorded 234.5mm (9.23in) over 14 days and August 204.7mm (8.06in) over 16 days — together 439.2mm, more than a third of the year's rain in two months. Rain typically arrives during June, which is why June's 100.6mm (3.96in) over 13 days sits between spring and monsoon behaviour. In 2025 the heaviest single month was actually September at 298.1mm (11.74in), driven by a small number of intense storm days rather than sustained monsoon rain.

Is October a good time to visit Korea?

Temperature-wise, yes: 19.4°C / 66.9°F days and 12.2°C / 54.0°F nights are ideal for walking and for foliage. But October 2025 recorded rain on 14 days totalling 158.8mm (6.25in), which is nearly ten times November's rainfall. October is often recommended as the best month; on this data November was clearly better. If you can only travel in autumn, aim for the second half of October into November rather than the first half.

How cold does Seoul actually get in winter?

February bottoms out at an average low of −6.5°C / 20.3°F, with January close behind at −5.3°C / 22.5°F. Daytime highs in both months barely clear freezing — 2.3°C / 36.1°F and 2.0°C / 35.6°F. That is cold enough to need gloves and a hat for any walk over twenty minutes, but it is dry cold: February saw rain on only 2 days. Snow is likely rather than constant, and the city clears it quickly.

When should I go if I want to avoid crowds and high prices?

March and November. March gives you 11.6°C / 52.9°F highs and only 44.8mm (1.76in) of rain over 8 days, at prices well below the April blossom peak. November gives you 12.3°C / 54.1°F highs and virtually no rain at all — 16.3mm (0.64in) over 2 days — after the autumn foliage rush has passed. Both require a warm coat and both cost noticeably less than April, May, or the first half of October.

Weather figures are measured 2025 observations for Seoul. Conditions vary by region — Jeju and the southern coast run warmer and wetter, Gangwon-do's mountains run colder — and a single year will not match a long-term average exactly.

Decided when to go? Here is the Korea packing list for those exact conditions.

Packing is half of it — the other half is knowing what to eat in Korea once you land.