- Temperature
- -6 to 35°C
Updated July 2026 · Sources cited: en.wikipedia.org, climatestotravel.com
Good to know
Good to Know
- April and October have the most reliable, pleasant weather for outdoor activities—clear skies, mild temps, lower crowds than March-May peak.
- July is genuinely disruptive for sightseeing due to constant monsoon rains and flooding risks; outdoor attractions often close.
- January combines extreme cold (-6°C (21°F) average, drops below -10°C (14°F)) with strong wind chill, making exposed sightseeing painful without proper gear.
- Winter and summer shoulder months (March, June, November) offer better crowds/prices but come with trade-offs: dust/wind in spring, monsoon start in June.
- Most annual rainfall (two-thirds) compresses into June-September; the rest of the year is much drier.
- Snowfall is light and sporadic despite the cold; plan around snow forecasts rather than assuming snow coverage.
- Typhoons are less of a direct threat in Seoul than southern coastal cities, but can still bring heavy rain and wind disruption July-October.
- Wind is often overlooked: spring winds and winter Siberian winds are real factors for outdoor comfort.
Autumn
- Months
- September-November
- Best For
- Hiking, sightseeing, colorful foliage
- Characteristics
- Cool, crisp, and dry. Clear skies. Autumn foliage.
- Precipitation Pattern
- Moderate to low. September still warm and occasionally rainy; October-November clear and dry.
Temperature Range
- Low Celsius
- 5
- High Celsius
- 20
- Low Fahrenheit
- 41
- High Fahrenheit
- 68
Spring
- Months
- March-May
- Best For
- Cherry blossoms (late March to early April), outdoor activities
- Characteristics
- Mild but initially windy. Gradually warming from cool to pleasant.
- Precipitation Pattern
- Moderate rainfall, gradually increasing. Affected by Asian dust (yellow dust/hwangsa) in March-May.
Temperature Range
- Low Celsius
- 0
- High Celsius
- 20
- Low Fahrenheit
- 32
- High Fahrenheit
- 68
Summer
- Months
- June-August
- Characteristics
- Hot, humid, and very wet. Peak rainfall and typhoon risk.
- Precipitation Pattern
- Very heavy. Monsoon season (jangma) late June-late July brings concentrated rainfall. July is the wettest month.
- Peak Temperature Celsius
- 35
- Peak Temperature Fahrenheit
- 95
Temperature Range
- Low Celsius
- 19
- High Celsius
- 31
- Low Fahrenheit
- 66
- High Fahrenheit
- 88
Winter
- Months
- December-February
- Best For
- Skiing, winter festivals, fewer crowds
- Characteristics
- Bitterly cold and dry, with Siberian wind influence. Generally little precipitation despite occasional snow.
- Precipitation Pattern
- Relatively dry (less than 10% of annual rainfall). Sparse snowfall when it occurs.
- Minimum Extreme Celsius
- -10
- Minimum Extreme Fahrenheit
- 14
Temperature Range
- Low Celsius
- -6
- High Celsius
- 4
- Low Fahrenheit
- 21
- High Fahrenheit
- 39
Snowfall
- Concentration
- Most likely January-February
- Occurs Months
- December-February
- Average Days Per Year
- 25
- Notes
- Sporadic snowfall when Siberian winds bring frosty weather. Winter is dry but can see occasional snow.
Annual Rainfall
- Total Mm
- 1236
- Total Inches
- 49
- Concentration
- Two-thirds falls in summer months (June-September), especially July-August.
Typhoons Monsoon
Monsoon Season
- Name
- Jangma (East Asian monsoon)
- Period
- Late June - late July
- Description
- Brings almost stationary front with heavy, sometimes torrential rainfall
Typhoon Season
- Impact
- Heavy showers and strong winds; less exposed than southern coast
- Period
- July-early October
- Frequency
- About once per year passes near or over Seoul area
Peak And Off Peak
- Worst Reason July
- Peak monsoon (jangma) with torrential rains, extreme humidity, and highest rainfall (averaging 316mm). Outdoor activities disrupted.
- Worst Reason January
- Coldest month with temperatures dropping below -10°C (14°F), strong Siberian winds, and minimal daylight.
Best Months
- April
- May
- September
- October
Worst Months
- July
- January
Rainfall By Season
Dry Season
- Months
- December-March
- Monthly Average Mm
- 21
- Notes
- Sparse precipitation; January and December driest
Wettest Period
- Months
- July-August
- Monthly Average Mm
- 300
- Notes
- Monsoon rains (jangma) can exceed 400mm in August
Moderate Rainfall
- Months
- June, September-October
- Monthly Average Mm
- 55-170
Air Quality Concerns
Asian Dust
- Season
- Spring (March-May)
- Predictability
- Sporadic
- Description
- Seasonal dust phenomenon (hwangsa) from Mongolian and Chinese deserts. Forms haze, causes breathing problems and eye irritation.
Temperature Extremes
Coldest Month
- Month
- January
- Average Low Celsius
- -6
- Can Drop To Celsius
- -10
- Average High Celsius
- 1
- Average Low Fahrenheit
- 21
- Can Drop To Fahrenheit
- 14
- Average High Fahrenheit
- 34
Warmest Month
- Month
- August
- Can Reach Celsius
- 35
- Average Low Celsius
- 22
- Average High Celsius
- 29
- Can Reach Fahrenheit
- 95
- Average Low Fahrenheit
- 72
- Average High Fahrenheit
- 84
AI-generated estimateData refreshed July 2026
Sources cited for this category
These are the sources cited in this climate & weather research for this city. Individual figures may not each trace to one of them.
More About Seoul
Data last updated July 2026 · Verify anything important.