Jeju · Month comparison

May vs October

October ranks #1 overall vs May at #4. Single best month — autumn foliage on Hallasan, pink muhly fields, tangerine harvest starting, clear 21C skies after typhoon season ends.

May Jeju Hallasan trail with spring flowers and clear blue sky

May

#4 of 12 months

Best match

Best all-round month — 20C, sea getting swimmable, hydrangeas appearing, Children's Day and Buddha's Birthday holidays spike short windows.

  • ↑Hallasan summit trails fully open — Seongpanak and Gwaneumsa to peak crater
  • ↑Hydrangeas (suregi) and azaleas across Saryeoni Forest
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
FactorMayOctober
Weather score
9
10
Value score
4
4
Crowd score
4
4
Events score
7
9
Atmosphere
10
10
Avg high temp20°C21°C
Monthly rain110mm80mm
Daily sunshine7hrs6hrs

May trade-offs

  • ↓Children's Day (May 5) and Buddha's Birthday: 3-day Korean travel surges
  • ↓Plum-rain season properly arriving — 110mm rainfall
  • ↓Hotel rates climbing toward summer peak

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 →May in detail →October in detail →
Scores compare months within Jeju. Climate data: Open Meteo ERA5 30-year normals (1991–2020). Methodology →