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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 painted wooden throne hall of Deoksugung Palace in Seoul, on its wide stone courtyard
Photo: Wikimedia Commons

The year at a glance

Tap a month for its full breakdown.

May

bestscore 69.5/100

Mild, 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 row is one measure across the same twelve months. The tint says how good that month is for it, the word says why.

  • Good
  • Okay
  • Rough
  • Grim

Feels like

peaks at 33° in August

  1. Jan-3°freezing
  2. Feb0°freezing
  3. Mar7°cold
  4. Apr15°cool
  5. May22°mild
  6. Jun28°warm
  7. Jul32°warm
  8. Aug33°hot
  9. Sep26°mild
  10. Oct17°cool
  11. Nov8°cold
  12. Dec-1°freezing

Real temp

2–29° in the shade across the year

  1. Jan2°freezing
  2. Feb5°cold
  3. Mar10°cold
  4. Apr17°cool
  5. May22°mild
  6. Jun26°mild
  7. Jul28°warm
  8. Aug29°warm
  9. Sep25°mild
  10. Oct19°cool
  11. Nov11°cold
  12. Dec3°freezing

Humidity

60% at its driest, 84% at its most oppressive

  1. Jan60%comfy
  2. Feb61%comfy
  3. Mar66%sticky
  4. Apr67%sticky
  5. May71%sticky
  6. Jun75%sweaty
  7. Jul84%sweaty
  8. Aug83%sweaty
  9. Sep77%sweaty
  10. Oct73%sticky
  11. Nov71%sticky
  12. Dec63%comfy

Rain

325mm in July, 19mm in January

  1. Jan19mmdry
  2. Feb24mmdry
  3. Mar42mmdryish
  4. Apr71mmdryish
  5. May97mmsome rain
  6. Jun133mmrainy
  7. Jul325mmsoaking
  8. Aug279mmsoaking
  9. Sep131mmrainy
  10. Oct57mmdryish
  11. Nov49mmdryish
  12. Dec21mmdry

Cloud cover

42% at its clearest, 75% at its greyest

  1. Jan44%bright
  2. Feb46%bright
  3. Mar49%bright
  4. Apr53%bright
  5. May56%mixed
  6. Jun64%mixed
  7. Jul75%grey
  8. Aug67%mixed
  9. Sep59%mixed
  10. Oct46%bright
  11. Nov45%bright
  12. Dec42%bright

Air quality

worst in January, cleanest in September

  1. Jan95moderate
  2. Feb90moderate
  3. Mar94moderate
  4. Apr94moderate
  5. May88moderate
  6. Jun88moderate
  7. Jul87moderate
  8. Aug90moderate
  9. Sep76moderate
  10. Oct81moderate
  11. Nov86moderate
  12. Dec83moderate

Daylight

9.6h to 14.7h of daylight across the year

  1. Jan9.9hshort
  2. Feb10.8hshortish
  3. Mar12heven
  4. Apr13.2heven
  5. May14.2hlong days
  6. Jun14.7hlong days
  7. Jul14.5hlong days
  8. Aug13.6heven
  9. Sep12.4heven
  10. Oct11.2hshortish
  11. Nov10.2hshortish
  12. Dec9.6hshort

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.

MonthFeels likeReal tempHumidityRainCloud coverAir qualityDaylight
January-3° freezing2° freezing60% comfy19mm dry44% bright95 moderate9.9h short
February0° freezing5° cold61% comfy24mm dry46% bright90 moderate10.8h shortish
March7° cold10° cold66% sticky42mm dryish49% bright94 moderate12h even
April15° cool17° cool67% sticky71mm dryish53% bright94 moderate13.2h even
May22° mild22° mild71% sticky97mm some rain56% mixed88 moderate14.2h long days
June28° warm26° mild75% sweaty133mm rainy64% mixed88 moderate14.7h long days
July32° warm28° warm84% sweaty325mm soaking75% grey87 moderate14.5h long days
August33° hot29° warm83% sweaty279mm soaking67% mixed90 moderate13.6h even
September26° mild25° mild77% sweaty131mm rainy59% mixed76 moderate12.4h even
October17° cool19° cool73% sticky57mm dryish46% bright81 moderate11.2h shortish
November8° cold11° cold71% sticky49mm dryish45% bright86 moderate10.2h shortish
December-1° freezing3° freezing63% comfy21mm dry42% bright83 moderate9.6h 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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