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When to go · Ulsan

Ulsan in September

Mixed month. Outside the best window (Mar–May, Oct). Across South Korea: Heat eases; typhoon risk remains and Chuseok shuts the country for 3 days in many years.

Key facts

Verdict
Mixed
Temperature
26°C (79°F) / 18°C (64°F)
average high / low
Rain days
9
Crowds
Medium
South Korea overall
Prices
Medium
South Korea overall

Verdict

MixedSouth Korea month rating

Outside the best window (Mar–May, Oct). Across South Korea: Heat eases; typhoon risk remains and Chuseok shuts the country for 3 days in many years.

Is another month better than September?

September is rated mixed. These months rate higher:

Weather in September

Long-term averages
  • UlsanHighs around 26 °C (79 °F), lows around 18 °C (64 °F), rain on about 9 days
  • Busan and south-east coast, South Korea · Busan, Gyeongju, Tongyeong, Ulsanstorm or typhoon risk

    Milder winters than Seoul, rarely below freezing; typhoons most likely Aug–Sep and ferries to Japan stop when they pass.

Festivals and holidays

Dates as our data lists them. Moving holidays (lunar and Islamic calendars, Easter) shift every year: check the date for your year before you build a trip on it.

  • Chuseok (harvest festival) big impact

    Chuseok: 24–26 Sep 2026 (passed); about 14–16 Sep 2027 (check) · South Korea

    Same three-day shutdown as Seollal; the largest travel peak of the year.

Crowds and prices

Crowds · South Korea overall
Medium
Prices · South Korea overall
Medium

South Korea overall: Heat eases; typhoon risk remains and Chuseok shuts the country for 3 days in many years.

Compare two months

Weather, crowds and prices for any two months in Ulsan, side by side.

  • Verdict

    Sep: Mixed

    Mar: Great (better)

  • Daytime high

    Sep: 26 °C (79 °F)

    Mar: 14 °C (57 °F)

  • Night low

    Sep: 18 °C (64 °F)

    Mar: 4 °C (39 °F)

  • Rain days

    Sep: 9

    Mar: 7 (better)

  • Crowds

    Sep: Medium

    Mar: Medium

  • Prices

    Sep: Medium

    Mar: Medium

  • Festivals listed

    Sep: 1

    Mar: 0

September: Outside the best window (Mar–May, Oct). Across South Korea: Heat eases; typhoon risk remains and Chuseok shuts the country for 3 days in many years.

March: Inside Ulsan's best window: Mar–May, Oct.

Ulsan: figures are long-term averages from this guide, not a forecast.

What to pack

  • A rain jacket or umbrella and shoes that dry fast
  • A spare day in the plan: storms can cancel flights and ferries

Build the full packing list for your trip →

Across South Korea in September →