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.
What the seasons are actually like
Traveling to Seoul month by month
Seoul's comfort score peaks in May at 84.3, with an average high of 22.2°C and 7.7 wet days, just ahead of October's 77.8 and September's 77.4. Summer (July–August) brings the year's heaviest rainfall, 15.8 and 15.2 wet days, and comfort drops to 56 and 56.1 as humidity climbs. Winter (December–February) is the coldest stretch, with highs of 2.3–5.5°C and a comfort score as low as 6.6 in January — the lowest of the year. RouteVerdict's editorial pick spans April, May, September, October, and November, covering both shoulder seasons around the wet, hot summer.
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.
Why does Seoul's summer (July-August) score so low despite being warm?
July and August bring the year's heaviest rainfall, 15.8 and 15.2 wet days, which pulls comfort down to 56 and 56.1 despite average highs of 28.7°C and 28.9°C.
What is Seoul's single best month for weather?
May, with an average high of 22.2°C, 7.7 wet days, and a comfort score of 84.3 — the highest measured for any month.