Best Time to Visit Seoul
South Korea · Humid Continental climate · Data averaged from 2020-01-01 to 2024-12-31 (5 years)
Recommended Months
Based on temperature comfort, low precipitation, and sunshine hours, the best time to visit Seoul is:
June → September → July
June scores 60/100 — the highest-rated month for travel.
Monthly Ratings (0-100)
Scores are weighted: temperature comfort (50%), low precipitation (30%), sunshine (20%). Higher is better.
| Month | Overall Score | Temp Comfort | Precipitation | Sunshine | Bar |
|---|---|---|---|---|---|
| January | 5 | 0 | 16 | 0 | |
| February | 4 | 0 | 15 | 0 | |
| March | 7 | 14 | 0 | 0 | |
| April | 22 | 44 | 0 | 0 | |
| May | 34 | 68 | 0 | 0 | |
| June | 47 | 94 | 0 | 0 | |
| July | 45 | 90 | 0 | 0 | |
| August | 44 | 88 | 0 | 0 | |
| September | 46 | 92 | 0 | 0 | |
| October | 26 | 52 | 0 | 0 | |
| November | 9 | 18 | 0 | 0 | |
| December | 10 | 0 | 35 | 0 |
Monthly Temperature Comfort
| Month | Mean Temp | Comfort Level |
|---|---|---|
| January | -2.7°C (27.1°F) | Cold (Below 0°C) |
| February | 0.1°C (32.2°F) | Cool (0-9°C) |
| March | 5.8°C (42.4°F) | Cool (0-9°C) |
| April | 11.9°C (53.4°F) | Mild (10-17°C) |
| May | 16.5°C (61.7°F) | Mild (10-17°C) |
| June | 21.9°C (71.4°F) | Warm (18-24°C) |
| July | 25.0°C (77.0°F) | Hot (25-29°C) |
| August | 25.4°C (77.7°F) | Hot (25-29°C) |
| September | 21.3°C (70.3°F) | Warm (18-24°C) |
| October | 13.4°C (56.1°F) | Mild (10-17°C) |
| November | 6.5°C (43.7°F) | Cool (0-9°C) |
| December | -1.9°C (28.6°F) | Cold (Below 0°C) |
Monthly Precipitation Rating
| Month | Rainfall (mm) | Rainy Days | Rating |
|---|---|---|---|
| January | 28.0 mm | 4.4 | Dry |
| February | 28.4 mm | 5.0 | Dry |
| March | 52.5 mm | 9.2 | Moderate |
| April | 57.7 mm | 9.2 | Moderate |
| May | 128.4 mm | 12.2 | Very Wet |
| June | 176.5 mm | 17.4 | Very Wet |
| July | 324.3 mm | 24.2 | Very Wet |
| August | 357.9 mm | 23.8 | Very Wet |
| September | 198.6 mm | 14.6 | Very Wet |
| October | 75.0 mm | 10.4 | Wet |
| November | 66.3 mm | 9.6 | Wet |
| December | 21.8 mm | 5.2 | Dry |
Monthly Sunshine Rating
| Month | Sunshine (hrs/day) | Rating |
|---|---|---|
| January | 7.4 hrs | Good |
| February | 7.9 hrs | Good |
| March | 8.8 hrs | Excellent |
| April | 9.2 hrs | Excellent |
| May | 9.5 hrs | Excellent |
| June | 9.2 hrs | Excellent |
| July | 8.1 hrs | Excellent |
| August | 8.5 hrs | Excellent |
| September | 8.5 hrs | Excellent |
| October | 8.2 hrs | Excellent |
| November | 7.4 hrs | Good |
| December | 7.4 hrs | Good |
Season-by-Season Breakdown
Spring (Mar-May)
Temperature: 11.4°C (52.5°F)
Rainfall: 79.5mm avg
Sunshine: 9.2 hrs/day
Humidity: 66.8%
Rainy Days: 10.2/mo
Mild transitional weather — comfortable for most activities.
Summer (Jun-Aug)
Temperature: 24.1°C (75.4°F)
Rainfall: 286.2mm avg
Sunshine: 8.6 hrs/day
Humidity: 81.1%
Rainy Days: 21.8/mo
This is the warm season. Ideal for outdoor activities but be prepared for heat.
Autumn (Sep-Nov)
Temperature: 13.7°C (56.7°F)
Rainfall: 113.3mm avg
Sunshine: 8.0 hrs/day
Humidity: 75.6%
Rainy Days: 11.5/mo
Mild transitional weather — comfortable for most activities.
Winter (Dec-Feb)
Temperature: -1.5°C (29.3°F)
Rainfall: 26.1mm avg
Sunshine: 7.6 hrs/day
Humidity: 62.9%
Rainy Days: 4.9/mo
This is the cool season. Pack warm layers and plan indoor activities.
Frequently Asked Questions
What is the best time to visit Seoul?
Based on our data-driven analysis, the best months to visit Seoul are June, September, July, when temperatures are comfortable, rainfall is lower, and sunshine is plentiful. June scores 60/100, the highest-rated month.
What is the hottest month in Seoul?
August is the hottest month with an average temperature of 25.4°C (77.7°F).
What is the coldest month in Seoul?
January is the coldest month with an average temperature of -2.7°C (27.1°F).
When is the rainy season in Seoul?
August is the wettest month with an average of 357.9mm of precipitation. Seoul experiences about 145.0 rainy days per year. The driest month is December with 21.8mm.
What should I pack for a trip to Seoul?
Packing recommendations depend on the season of your visit. Based on the climate data, pack lightweight, breathable clothing if visiting during the warm months (August is hottest at 25.4°C). For cooler months, bring layers and a warm jacket (January averages -2.7°C). A waterproof jacket or umbrella is recommended year-round as Seoul receives 1515.0mm of annual precipitation. Sun protection is important, especially during months with high UV index.
Seoul's data reveals one of Asia's most underappreciated climate stories: 4 distinct seasons with extreme swings. January averages -5°C; August hits 30°C with 80% humidity — a 35°C annual swing. I tracked a week there last April and the cherry blossoms aligned perfectly with 16°C and 8 sunshine hours. The numbers say avoid July's monsoon (300mm+ of rain) and August's heat. September-October is the statistical sweet spot: 18°C, 40mm rain, UV dropping to 5. December-February has its own appeal if you can handle -10°C with wind chill.
Data Source: Open-Meteo historical archive (2020-01-01 to 2024-12-31). Daily measurements aggregated into monthly climate normals. Coordinates: 37.57°, 126.98°. Timezone: Asia/Seoul. Last updated: 2026-07-30.