Measured, not vibes
Best Time to Visit Seoul
By measured weather comfort, the top months for Seoul are May, October, September — and RouteVerdict's editorial pick, which also weighs crowds and prices, is April, May, September, October, November. The table below is computed from ERA5 reanalysis data for 2020–2024, measured at Seoul (38 m elevation).
Month by month
Seoul weather and comfort, 2020–2024
| Month | Avg high | Wet days | Comfort | Season |
|---|---|---|---|---|
| January | 2.3°C / 36°F | 3.7 | 7 | |
| February | 5.5°C / 42°F | 4.2 | 14 | |
| March | 12°C / 54°F | 5.3 | 42 | |
| April | 17.9°C / 64°F | 5.2 | 76 | |
| May | 22.2°C / 72°F | 7.7 | 84 | Best |
| June | 26.9°C / 80°F | 10 | 73 | Shoulder |
| July | 28.7°C / 84°F | 15.8 | 56 | |
| August | 28.9°C / 84°F | 15.2 | 56 | Shoulder |
| September | 25.5°C / 78°F | 9.8 | 77 | Best |
| October | 18.4°C / 65°F | 5.7 | 78 | Best |
| November | 11.4°C / 53°F | 5.7 | 39 | |
| December | 2.6°C / 37°F | 2.7 | 7 |
Comfort is RouteVerdict's 0–100 score: 100·exp(−(high−23)²/162) × (1 − min(0.35, wet days × 0.02)). The full method is on the methodology page. Weather data by Open-Meteo.com (ERA5, CC BY 4.0), 2020–2024 normals. Wet day = ≥1 mm precipitation.
FAQ
Seoul timing questions
What is the best month to visit Seoul?
By measured weather comfort (ERA5 2020–2024), the top months are May, October, and September, with May scoring highest. RouteVerdict's editorial pick is April, May, September, October, and November, which also weighs crowds, prices, and events.
What is the hottest month in Seoul?
August, with an average daily high of 28.9°C (84°F).
What is the rainiest month in Seoul?
July, averaging 15.8 days with at least 1 mm of precipitation.
When is shoulder season in Seoul?
June and August — the best-scoring months outside both the measured top three and RouteVerdict's editorial peak-season pick.