Weather | 15–20°C, mild, with blossom-season chill in mornings | 20–25°C, warmer, generally dry, easy for full days outside | 25–28°C, warmer and stickier, with humidity rising late month |
Crowds | High during cherry blossom weeks, especially early April | High through weekends, holidays, and festival periods | Moderate overall, heavier late month and on warm evenings |
Atmosphere | Blossoms, photo stops, spring opening energy | Festival-heavy, green parks, long evenings, picnic season | Early-summer feel, more river hangouts, first hint of monsoon mood |
Key events | Yeouido and Seokchon Lake blossom season, Royal Culture Festival | Children’s Day, Lotus Lantern events, Seoul Jazz Festival, Friendship Festival | Seoul International Book Fair, Han River concerts, early summer arts events |
Public holidays | No major citywide holiday pressure compared with May | Children’s Day on May 5, Buddha’s Birthday on May 24, 2026 | No major public holiday shaping travel patterns |
Budget | Higher around blossom peak and central photo zones | High on holiday weekends and mid-May festival dates | Usually softer than May, except for popular weekend stays |
Best for | Cherry blossom chasers, photographers, palace gardens | First-timers, festival fans, couples, families, DMZ day trips | Evening river plans, indoor-outdoor mix, shoulder-season value |
Book early? | Yes, especially for blossom week hotels | Yes, especially for tours, sunset slots, and family-month weekends | Less urgent, though popular day trips still benefit from advance booking |
Transport tips | Expect crowding around Yeouido, Seokchon Lake, and palaces | Allow extra time near Jongno, Seoul Plaza, and family attractions | Carry an umbrella and watch for late-day showers by late June |