May 21 is generally a great time to visit Busan. While there is a slight chance of rain (18%), showers are usually brief. Expect comfortable 22°C weather. It's a lively time to explore Busan, with most attractions operating at full capacity.
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Essential Travel Info for Busan
Currency
KRW
₩ South Korean won
Language
Korean
Driving
Right side
Safety
High Safety
GPI: 1.779
Busan Weather Forecast for May 21
"Mild & Comfortable. Expect average highs of 22.3°C. 18% chance of rain."
What to Wear in Busan in May
Based on historical data for May 21, Busan typically experiences temperatures between 14.4°C and 22.3°C. We recommend packing t-shirt, light clothing to stay comfortable. Trends suggest it will stay mostly dry (18% rain probability), but checking the forecast before heading out is always wise.
Complete Packing Guide
Weekly breakdown & essential items for Busan
Smart Suitcase
- T-Shirt
- Light Clothing
Average High
22.3°C
Daytime Peak
Average Low
14.4°C
Nighttime Low
Feels Like
22.7°C
☀️ Feels accurate
Rain Chance
18%
Avg 1.2mm if it rains
Cloud Cover
57%
Overcast
Pressure
1010.8 hPa
Medium volatility
Busan Weather Conditions & UV Index
Weather Confidence
30-year variance analysis
Based on 10 years of data
🎯 This date historically delivers consistent weather 95% 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
🔴 15 min to burn
Type III-IV
🟡 23 min to burn
Type V-VI
🟢 38 min to burn
UV estimate based on latitude, season & cloud cover. Actual UV may vary.
Outdoor Comfort
How pleasant is it outside?
Dew Point
17.6°C
Noticeable
Heat Stress
Low
No heat warning
😊 Best outdoor time:
Any time during daylight hours
Marine Conditions
Marine Life
No special warnings. Enjoy the swim!
Swim Index
❄️ Cold Water Hazard
Travel & Logistics Insights
Local Calendar
Business Day
Standard hours in South Korea
Flight Traffic
Busy
76/100 pressure index
Health Advisory
Required
2 vaccines • View Details →
Landing Slots
~127
Daily arrival options (inc. codeshare)
Sunrise, Sunset & Wind in Busan
Daylight & Sun
Solar Elevation Cycle
🌅 Sunrise
05:17
☀️ Noon
12:21
🌇 Sunset
19:25
⏱️ Daylight
14h 8m
Wind Speed
16.4 km/h
Gentle breeze
Sunshine
10.4 hrs
Direct Sun (Cloud-free)
Humidity
75%
Humid / Damp
Travel Intelligence
Exclusive flight analytics & health data for Busan
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 Busan
Travel Comfort Index
Real-time tourism conditions
Weather Quality
☀️ Excellent
Tourist Crowds
🟡 Busy
Price Level
💰💰💰 Expensive
Health & Wellbeing
Meteo-Health Forecast
Moderate fluctuations. Some sensitivity possible.
Mild discomfort possible for arthritic conditions.
Moderate fish activity expected.
Air quality is acceptable. Sensitive individuals should limit prolonged outdoor exertion.
Regional Safety Profile
Seismic Activity
Rare minor tremors. Buildings are earthquake-resistant.
Typhoon Risk
Year-round risk present
Travel Alert: This region has elevated natural risks. We recommend registering with your embassy and keeping emergency numbers handy.
"According to 30YearWeather's analysis of 30 years of NASA satellite data, Busan on May 21 averages 22.3°C with a 18% precipitation probability. Wedding/Outdoor Event Score: 98/100."
— Source: 30YearWeather.com|Data: NASA POWER (1991-2021)|View Methodology
Busan Weather History (2010–2024)
Temperature History
Hall of Fame
Records from last 10 years
Better Alternatives Nearby
Consider these dates within ±7 days
May 23
22.8°C • 15% rain
Score
100
May 24
22.8°C • 15% rain
Score
100
May 22
22.5°C • 17% rain
Score
99
💡 Moving your event by a few days could significantly improve weather conditions
Compare Other Cities
Same date (May 21) in other destinations
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📍 Is Busan Worth Visiting on May 21?
Planning a trip to Busan on May 21? Our historical weather analysis based on 30 years of NASA satellite data shows that this time of year is characterized by pleasant mild weather averaging 22.3°C with a 18% historical precipitation risk.
✈️ Travel Logistics: Approximately 127 landing slots available daily during this period, indicating manageable crowd levels.
💉 Health Advisory: 10 vaccinations are recommended for South Korea, including COVID-19.
🌊 Coastal Conditions: Water temperature averages 17.5°C (refreshing tonic). Wave conditions are generally fun waves with heights around 0.56m.
📊 Historical Extremes: The hottest May 21 recorded in the last 30 years saw temperatures hit 27.1°C in 2022, while the coldest dropped to 9.8°C in 2019.