July 21 sees frequent showers in Seoul. Historical data shows a 50% chance of rain, so pack accordingly. Temperatures average 29°C. Seoul is currently in its most popular travel window, meaning vibrant crowds and premium pricing.
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Essential Travel Info for Seoul
Currency
KRW
₩ South Korean won
Language
Korean
Driving
Right side
Connect
Internet cafes known asPC bang(PC 방) (pr...
Safety
High Safety
GPI: 1.779
Seoul Weather Forecast for July 21
"Warm & Sunny. Expect average highs of 29°C. 50% chance of rain."
What to Wear in Seoul in July
Based on historical data for July 21, Seoul typically experiences temperatures between 22.7°C and 29°C. We recommend packing t-shirt, light clothing, umbrella to stay comfortable. With a 50% chance of rain, keeping a raincoat or umbrella handy is a smart move.
Complete Packing Guide
Weekly breakdown & essential items for Seoul
Smart Suitcase
- T-Shirt
- Light Clothing
- Umbrella
Average High
29°C
Daytime Peak
Average Low
22.7°C
Nighttime Low
Feels Like
35.9°C
🔥 Heat index effect
Rain Chance
50%
Avg 7.7mm if it rains
Cloud Cover
75%
Moderate rain
Pressure
1007.6 hPa
Low volatility
Seoul Weather Conditions & UV Index
Weather Confidence
30-year variance analysis
Based on 10 years of data
🎯 This date historically delivers consistent weather 96% of the time. Safe to plan outdoor activities with confidence.
Sun Exposure
UV Index & Safety Guide
Protection Needed
SPF 30 recommended
05:00 - 10:00
16:00 - 19:00
Type I-II
🔴 19 min to burn
Type III-IV
🟡 29 min to burn
Type V-VI
🟢 48 min to burn
UV estimate based on latitude, season & cloud cover. Actual UV may vary.
Outdoor Comfort
How pleasant is it outside?
Dew Point
26.2°C
Humid/Sticky
Heat Index
35.9°C
Feels hotter
😕 Best outdoor time:
Morning hours (before 11 AM)
Travel & Logistics Insights
Local Calendar
Business Day
Standard hours in South Korea
Flight Traffic
High
91/100 pressure index
Health Advisory
Required
2 vaccines • View Details →
Landing Slots
~1,050
Daily arrival options (inc. codeshare)
Sunrise, Sunset & Wind in Seoul
Daylight & Sun
Solar Elevation Cycle
🌅 Sunrise
05:27
☀️ Noon
12:39
🌇 Sunset
19:51
⏱️ Daylight
14h 23m
Wind Speed
13.7 km/h
Gentle breeze
Sunshine
7.9 hrs
Direct Sun (Cloud-free)
Humidity
85%
Humid / Damp
Travel Intelligence
Exclusive flight analytics & health data for Seoul
Smart Flight Estimator
Airport-to-Airport Logistics
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Add your home location in settings to see airport details.
Travel Health & Safety in Seoul
Travel Comfort Index
Real-time tourism conditions
Weather Quality
⛅ Good
Tourist Crowds
🔴 Very Busy
Price Level
💰💰💰 Expensive
Health & Wellbeing
Meteo-Health Forecast
Stable conditions. Low risk of headaches.
Mild discomfort possible for arthritic conditions.
Moderate fish activity expected.
Unhealthy for sensitive groups. Consider wearing a mask outdoors.
Regional Safety Profile
Seismic Activity
Zero seismic activity detected in 30 years.
"According to 30YearWeather's analysis of 30 years of NASA satellite data, Seoul on July 21 averages 29°C with a 50% precipitation probability. Wedding/Outdoor Event Score: 76/100."
— Source: 30YearWeather.com|Data: NASA POWER (1991-2021)|View Methodology
Seoul Weather History (2010–2024)
Temperature History
Hall of Fame
Records from last 10 years
Better Alternatives Nearby
Consider these dates within ±7 days
July 27
30.3°C • 35% rain
Score
84
July 26
30.1°C • 37% rain
Score
83
July 28
30.3°C • 35% rain
Score
83
💡 Moving your event by a few days could significantly improve weather conditions
Compare Other Cities
Same date (July 21) in other destinations
🌍 Explore the same date in different destinations around the world
📍 Is Seoul Worth Visiting on July 21?
Planning a trip to Seoul on July 21? Our historical weather analysis based on 30 years of NASA satellite data shows that this time of year typically offers vibrant summer conditions averaging 29°C with a 50% historical precipitation risk.
✈️ Travel Logistics: Approximately 1,050 landing slots available daily during this period, indicating peak tourist activity.
💉 Health Advisory: 10 vaccinations are recommended for South Korea, including COVID-19.
📊 Historical Extremes: The hottest July 21 recorded in the last 30 years saw temperatures hit 33.6°C in 2021, while the coldest dropped to 19.9°C in 2020.