Jeju · Month comparison

September vs October

October ranks #1 overall vs September at #6. Single best month — autumn foliage on Hallasan, pink muhly fields, tangerine harvest starting, clear 21C skies after typhoon season ends.

September Jeju pink muhly grass field in early autumn light

September

#6 of 12 months

Strong option

Summer crowds gone, but typhoon season runs through September — when calm, the sea is still warm, prices drop, and Chuseok creates a short crowd burst.

  • ↑Sea still 24C — warmest swimming after the crowds clear
  • ↑Hotel rates 40% below August peak after first week
October Jeju Hallasan autumn foliage in orange and red colours

October

#1 of 12 months

Best match

Single best month — autumn foliage on Hallasan, pink muhly fields, tangerine harvest starting, clear 21C skies after typhoon season ends.

  • ↑Hallasan autumn foliage (danpung) peaks third week — Yeongsil trail spectacular
  • ↑Pink muhly grass at Saryeoni and Hwasun in full neon-pink
FactorSeptemberOctober
Weather score
7
10
Value score
5
4
Crowd score
5
4
Events score
6
9
Atmosphere
8
10
Avg high temp26°C21°C
Monthly rain180mm80mm
Daily sunshine6hrs6hrs

September trade-offs

  • ↓Chuseok (Korean Thanksgiving, often Sep): 5-day family-travel disruption
  • ↓Active typhoon season — 1-2 storms can hit hard
  • ↓Plum-rain tail showers continuing

October trade-offs

  • ↓Hotel rates climbing — Shilla and Lotte at autumn-peak 30% above shoulder
  • ↓Hangeul Day and Foundation Day holiday weekends busy
  • ↓Hallasan summit weekends require 04:00 trailhead arrival
See all 12 months for Jeju →September in detail →October in detail →
Scores compare months within Jeju. Climate data: Open Meteo ERA5 30-year normals (1991–2020). Methodology →