Seoul, South Korea

Set at altitude, Seoul (South Korea) is best understood through its weather data: our 2015–2024 climate record puts its peak at an 87/100 sun score in May, exactly the kind of reliability you want for a city break.

Across a typical year, afternoon temperatures swing between 2°C (January) and 29°C (July). The wet–dry contrast is pronounced: 56% rain-day odds in July against 10% in January. The genuinely warm window — average highs of 24°C or better — covers June–September.

Season by season (on the northern calendar), spring brings 18°C highs with 22% rain-day odds, summer 29°C at 47%, autumn 18°C at 24%, and winter 3°C at 13%. That makes summer the statistical sweet spot (season score 77), with spring a workable second; winter is where the odds thin out. If your dates are flexible, September buys you 25°C warmth at the quiet end of the season.

Best months to visit Seoul

The best month on record is May — an 87/100 sun score, built on 55% cloud cover and 27% rain-day odds — followed by June and September. In practice you have flexibility — April–October all stay above a 70 sun score. Skip November if sunshine is the point — it bottoms out at 55/100.

Put against its 82 mountain peers in May, it lands in the sunnier half of the group, ahead of 78% of them.

Month-by-month breakdown for Seoul → · More destinations for May →

As of the latest refresh, Seoul's next 16 days span -3°C to 18°C; 8 days look mostly sunny while none look likely to be wet — a live sun score of 61/100.