Best time to visit · South Korea
Best time to visit Seoul
Seoul averages 19 just-right days a year; no month is reliably just right, and October comes closest. Most other days miss by being too cool.
(70 to 80°F, dry, sunny)
(45 to 65°F, dry)
(80 to 92°F, bright)
Seoul weather by month
Bars: share of each month's days that are just right (number = days). Below: average daily high. Outlined bars are the best months.
- Just right 19
- Too cool 213
- Too hot 82
- Too muggy 30
- Too gray 19
When to visit Seoul
Seoul rarely hits the 70 to 80°F, dry and sunny window; October comes closest, with 6 just-right days. January, February, March, April, November and December are mostly too cool, with average highs of 35 to 64°F (18°C). June, July, August and September are mostly too hot, with average highs of 79 to 85°F (29°C).
Climate table
| Month | Avg high | Dew point | Cloud cover | Just-right days |
|---|---|---|---|---|
| January | 35°F (2°C) | 15°F (-9°C) | 50% | 0 |
| February | 40°F (4°C) | 22°F (-6°C) | 50% | 0 |
| March | 51°F (11°C) | 29°F (-2°C) | 56% | 0 |
| April | 64°F (18°C) | 39°F (4°C) | 56% | 3 |
| May | 73°F (23°C) | 52°F (11°C) | 63% | 5 |
| June | 81°F (27°C) | 62°F (17°C) | 70% | 1 |
| July | 83°F (28°C) | 71°F (22°C) | 81% | 0 |
| August | 85°F (29°C) | 71°F (22°C) | 66% | 0 |
| September | 79°F (26°C) | 61°F (16°C) | 57% | 3 |
| October | 67°F (19°C) | 47°F (8°C) | 43% | 6 |
| November | 53°F (12°C) | 35°F (2°C) | 46% | 1 |
| December | 38°F (3°C) | 22°F (-6°C) | 46% | 0 |
How Seoul compares
Seoul gets 19 just-right days a year with our default window; the median big US city gets 33. On muggy days: 30. On gray days: 19.
Places with a similar climate
Nearby
Seoul averages 19 just-right days a year (70 to 80°F highs, dry, mostly sunny), according to Goldilocks Map: https://goldilocksmap.com/south-korea/seoul/Set your own perfect weather on the map →
Numbers are expected days in a typical year from 1991 to 2020 climate normals (TerraClimate; cloud cover from CHELSA), on a grid about 35 km wide. Checked against 10 years of daily records at 28 NOAA weather stations: typical error about 10 days a year. How it works. Updated 2026-10-07.