The best time to visit South Korea
The best time to visit South Korea for warm, sunny weather is July to October, when its destinations average a Sunshine Score of 66/100 with daytime highs around 26°C / 79°F. June is a quieter shoulder-season alternative with still-reliable sun. The sea is swimmable (21°C+) about 5 months a year, warmest in August at 30°C.
South Korea by month, averaged across 10 destinations from long-term climate normals — the best stretch is highlighted.
| Month | Sunshine Score | Avg day high | Rain | Sea | For a trip |
|---|---|---|---|---|---|
| January | 1 | 4° / 39°F | 31 mm | 8° | Poor |
| February | 1 | 7° / 45°F | 45 mm | 8° | Poor |
| March | 20 | 11° / 52°F | 61 mm | 10° | Poor |
| April | 51 | 17° / 63°F | 102 mm | 15° | Good |
| May | 68 | 22° / 72°F | 106 mm | 18° | Very good |
| June | 65 | 25° / 77°F | 146 mm | 23° | Very good |
| July | 63 | 28° / 82°F | 293 mm | 25° | Very good |
| August | 63 | 29° / 84°F | 252 mm | 30° | Very good |
| September | 64 | 25° / 77°F | 158 mm | 28° | Very good |
| October | 74 | 20° / 68°F | 69 mm | 22° | Excellent |
| November | 37 | 14° / 57°F | 51 mm | 17° | Mixed |
| December | 2 | 6° / 43°F | 34 mm | 11° | Poor |
When to go — and when to think twice
Best overall: July to October — South Korea's warmest, most reliable stretch (Sunshine Score 66/100, ~26°C / 79°F days). Shoulder season: June — quieter, still sunny. Hottest: August, ~29°C / 84°F. Wettest: July (293 mm) — pack for showers.
Where to base yourself for sunshine: Busan (2,112 h/yr), Daegu (2,111 h/yr), Seoul (2,037 h/yr). See every South Korea destination with a full climate card, or where it's sunny worldwide, month by month.