Gangneung weather in September

September in Gangneung: warm, soaked, with clean air — fine if you can take 14 rainy days.

Updated September 2026 · climate normals from ERA5 reanalysis

Gangneung🇰🇷 South Korea · Korea · Beach74
  1. 52Jan
  2. 57Feb
  3. 68Mar
  4. 77Apr
  5. 81May
  6. 85Jun
  7. 76Jul
  8. 72Aug
  9. 74Sep
  10. 70Oct
  11. 69Nov
  12. 54Dec

#5 of 12 months in Gangneung · #873 of 1413 destinations to visit in September · comfort 74/100 (tier B)

Days
25°C
Nights
17°C
Wet days
14
Sun
8 h
Humidity
81%
Daylight
12 h
Gangneung, South Korea
Photo: 정규송 Nui MALAMA · Pexels

Traveller notes on Gangneung in September

Notes from nearby Pyeongchang (60 km away)

Gangneung doesn't have its own notes for September yet — these are about Pyeongchang, close enough to share the season.

Pyeongchang-forum threads comparing seasons describe the region as genuinely worth a visit well beyond its Olympic winter identity, the surrounding highlands offering a real break from Seoul's summer intensity into early autumn. Posters call September a comfortable stretch, mild days balanced against noticeably cooler evenings given the elevation. Regulars recommend the Hyoseok buckwheat festival and Odaesan National Park's early foliage as genuine highlights, both drawing crowds without feeling overwhelmed. A real shower is possible on any given day, though posters call it generally passing rather than a full washout this time of year. Regulars describe the leftover Olympic venues as still worth a stop for anyone curious, transport from Seoul comparatively easy. Posters recommend layering for the day-to-evening swing regardless of forecast. The record: 25C days feeling like 27C, 15.7C nights, an extraordinarily high 167mm across nearly 11 days and 81 percent humidity.
PyeongchangSeptemberRegular · September · 1 month ago · about Pyeongchang · Read more on tripadvisor.co.nz ↗

Other months in Gangneung

South Korea's forum notes that early December isn't yet the harshest stretch of winter - closer to freezing than truly bitter - while conditions turn noticeably colder as the month goes on toward the end-of-December-into-January cold snap. Gangwon-do, the province Gangneung sits in, gets flagged repeatedly for its ski resorts and real mountain snow, though Gangneung itself on the coast tends to stay drier and sunnier than the interior thanks to its position. Posters were clear that cold-and-bright is a perfectly good travel day here; it's the damp, gloomy stretches that are less pleasant.
GangwonCoastRegular · December · 1 month ago · Read more on Tripadvisor ↗
Forum posters describe the first half of June across South Korea as generally dry and hot by day, cooling off somewhat at night, with the monsoon (jangma) typically not arriving until the final week of the month - meaning early-to-mid June should stay comfortably ahead of the wetter, stickier conditions that follow. Posters consistently recommend shorts and short-sleeve shirts for the day, with a long-sleeve layer worth packing for cooler evenings. Given Gangneung's coastal position on the East Sea, posters' general Korea-wide June guidance applies well here, with the beach town's early-June conditions likely staying pleasant right up until the monsoon's late-month arrival shifts the pattern toward more persistent rain.
Tripadvisor community · June · 1 month ago · Read more on Tripadvisor ↗

Add your own note from Gangneung's card on the map.

Gangneung climate normals — September

Daytime high25°C / 77°F🌤 warm
Nighttime low17°C / 63°F
Feels like (high)27°C / 81°F
Sea temperature24°C / 76°F🙂 pleasant
Rainfall221 mm / 8.7 in⛈ soaked
Rainy days14 days
Humidity81%💦 very humid
Dew point16°C / 60°F
Sunshine8 h/day
Daylight12.4 h
Wind12 km/h / 8 mph
Air quality (US AQI)43🍃 good

Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.

Crowds in Gangneung in September

How busy the place itself is — school and mass holidays, the months an editor tagged, and how sought-after the weather makes them. Never part of the comfort score.

Peak crowdsChuseok, Chuseok in South Korea, school holidays in 2 of the markets that fill it(estimated)

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Peak crowdsBusyShoulder seasonQuiet

Best months for Gangneung's weather

Ranked by this destination's own climate comfort score across the year — a different thing from how busy it gets (see Crowds above).

Fair weatherGangneung's weather peaks April–June.

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Best weatherFair weatherToughest weather

What's on in Gangneung in September

Recurring seasonal events, natural spectacles, closures and holidays — curated and sourced.

  • Holiday

    Chuseok

    24–26 SepNational holidayClosuresBook earlyCrowded

    Chuseok, the autumn harvest festival, is a three-day public holiday when Koreans travel home. Train and express bus tickets sell out as soon as they go on sale, highways jam, and many small restaurants and shops close for the holiday, while big attractions stay open. Source ↗

What's on around the world in September →

Nearby, and something's on

Within 300 km of Gangneung — a day trip or a short hop — with something on this month. Never part of the comfort score.

Where is Gangneung?

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Gangneung in September — FAQ

Is September a good time to visit Gangneung?
September in Gangneung: warm, soaked, with clean air — fine if you can take 14 rainy days. It ranks #5 of 12 months for Gangneung on SeasonMap's comfort score (74/100).
What is the weather like in Gangneung in September?
In September, Gangneung averages a daily high of 24.9°C and a low of 17.4°C, with about 220.7 mm of rain over roughly 13.6 rainy days.
What is the air quality in Gangneung in September?
Gangneung has a mean US Air Quality Index of about 43 in September.

Within 300 km: Seoul's Chuseok on 24–26 Sep, and Busan's Chuseok on 24–26 Sep.