Seoul · South Korea · 1995–2024 averages
Seoul weather, month by month. May is the pick.
Thirty years of averages for Seoul, South Korea — how hot it really feels, when the rain arrives, and what the air is like. May comes out on top; August is the one to skip.
The year at a glance
Tap a month for its full breakdown.
May
bestscore 69.5/100Mild, sticky and some rain, with moderate air.
- Feels like
- 22°
- mild
- Real temp
- 22°
- mild
- Humidity
- 71%
- sticky
- Rain
- 97mm
- some rain
- Cloud cover
- 56%
- mixed
- Air quality
- 88
- moderate
- Daylight
- 14.2h
- long days
Month by month, metric by metric
Each strip covers the same twelve months, so you can see where the rain lands and how the air shifts with it.
Feels like
peaks at 33° in August
Real temp
2–29° in the shade across the year
Humidity
60% at its driest, 84% at its most oppressive
Rain
325mm in July, 19mm in January
Cloud cover
42% at its clearest, 75% at its greyest
Air quality
worst in January, cleanest in September
Daylight
9.6h to 14.7h of daylight across the year
Seoul's air, month by month
The air is at its worst in January at 95 AQI (moderate), and at its cleanest in September at 76 (moderate). The dirtiest months here are also the driest.
Every month in full
All twelve months, all seven measures.
| Month | Feels like | Real temp | Humidity | Rain | Cloud cover | Air quality | Daylight |
|---|---|---|---|---|---|---|---|
| January | -3° freezing | 2° freezing | 60% comfy | 19mm dry | 44% bright | 95 moderate | 9.9h short |
| February | 0° freezing | 5° cold | 61% comfy | 24mm dry | 46% bright | 90 moderate | 10.8h shortish |
| March | 7° cold | 10° cold | 66% sticky | 42mm dryish | 49% bright | 94 moderate | 12h even |
| April | 15° cool | 17° cool | 67% sticky | 71mm dryish | 53% bright | 94 moderate | 13.2h even |
| May | 22° mild | 22° mild | 71% sticky | 97mm some rain | 56% mixed | 88 moderate | 14.2h long days |
| June | 28° warm | 26° mild | 75% sweaty | 133mm rainy | 64% mixed | 88 moderate | 14.7h long days |
| July | 32° warm | 28° warm | 84% sweaty | 325mm soaking | 75% grey | 87 moderate | 14.5h long days |
| August | 33° hot | 29° warm | 83% sweaty | 279mm soaking | 67% mixed | 90 moderate | 13.6h even |
| September | 26° mild | 25° mild | 77% sweaty | 131mm rainy | 59% mixed | 76 moderate | 12.4h even |
| October | 17° cool | 19° cool | 73% sticky | 57mm dryish | 46% bright | 81 moderate | 11.2h shortish |
| November | 8° cold | 11° cold | 71% sticky | 49mm dryish | 45% bright | 86 moderate | 10.2h shortish |
| December | -1° freezing | 3° freezing | 63% comfy | 21mm dry | 42% bright | 83 moderate | 9.6h short |
Seoul weather questions
- What is the best time to visit Seoul?
- May scores best across temperature, rain, humidity and air quality — 22° feels-like, 97mm of rain and 71% humidity. August is the month to avoid: 279mm of rain and 90 AQI.
- How hot does Seoul get?
- August is the peak, at 33° feels-like (29° in the shade) — hot. Even in May it reaches 22°.
- When is the rainy season in Seoul?
- July is the wettest month at 325mm, and January the driest at just 19mm.
- Is air quality a problem in Seoul?
- January is the worst month at 95 AQI (moderate), and September the best at 76 (moderate).
Weather normals from Open-Meteo (ERA5 reanalysis, 1995–2024) and CAMS air quality (2015–2024), licensed CC-BY-4.0. Contains modified Copernicus Climate Change Service information. These are long-run averages, not forecasts — any given year will differ.
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