Best time to visit Seoul: month-by-month weather (2026)
The highest-scoring months in Seoul are Jun and Sep.
Best months
Jun and Sep
Peak season
Jun, Jul, Aug and Sep
Off season
Jan, Nov and Dec
Monthly Temperatures (°C)
Monthly Rainfall (mm)
Month-by-Month Guide
Temperature, rainfall and sunshine are measured. The visit score below is derived from those three (design spec §5.3)estimate.
Jan
Temp: -6.4°C – 2.2°C
Rain: 24mm
Sunshine: 7.2h/day
Visit score: 4.7/10
Feb
Temp: -4.4°C – 5°C
Rain: 24mm
Sunshine: 7.7h/day
Visit score: 4.8/10
Mar
Temp: 0.6°C – 12.1°C
Rain: 38mm
Sunshine: 9h/day
Visit score: 5/10
Apr
Temp: 7.1°C – 18.6°C
Rain: 82mm
Sunshine: 8.7h/day
Visit score: 4.7/10
May
Temp: 12°C – 22.3°C
Rain: 132mm
Sunshine: 9.1h/day
Visit score: 6.7/10
Jun
BestTemp: 18.2°C – 27.7°C
Rain: 144mm
Sunshine: 9.6h/day
Visit score: 8.2/10
Jul
Temp: 23.1°C – 30°C
Rain: 392mm
Sunshine: 8h/day
Visit score: 5.7/10
Aug
Temp: 23.5°C – 30.5°C
Rain: 232mm
Sunshine: 9.9h/day
Visit score: 5.8/10
Sep
BestTemp: 19.3°C – 26.6°C
Rain: 218mm
Sunshine: 7.9h/day
Visit score: 7.2/10
Oct
Temp: 10.6°C – 19.3°C
Rain: 86mm
Sunshine: 7.2h/day
Visit score: 6.4/10
Nov
Temp: 2.5°C – 11.5°C
Rain: 54mm
Sunshine: 7.7h/day
Visit score: 3.9/10
Dec
Temp: -4.3°C – 3.5°C
Rain: 43mm
Sunshine: 7.2h/day
Visit score: 3.8/10
When to go, and when not to
June and September are the two best-rated months to visit Seoul, combining warm temperatures with strong sunshine. June averages a high of 27.7C and low of 18.2C with about 9.6 hours of sunshine a day, while September cools slightly to a high of 26.6C and low of 19.3C with roughly 7.9 hours of sunshine, avoiding the sharpest summer heat while still offering long days outdoors.
The trade-off is that June through September is also peak season, with July and August bringing the heaviest rain and highest heat of the year — July sees 392mm of rain and highs of 30.0C, while August highs reach 30.5C with 232mm of rain. Travelers who prefer lower prices and fewer crowds can instead consider the off-season months of January, November, and December, though these bring much colder temperatures, with January highs averaging just 2.2C.
Season Guide
Spring
March – May
Mild temperatures and blooming gardens. A great time for sightseeing with fewer crowds than summer.
Packing tips
- · Light layers
- · Rain jacket
- · Comfortable walking shoes
Summer
June – August
Warmest months with the longest days. Peak tourist season in most destinations.
Packing tips
- · Sunscreen
- · Hat
- · Light clothing
- · Refillable water bottle
Autumn
September – November
Cooling temperatures and autumn foliage. Shoulder season with good deals on accommodations.
Packing tips
- · Medium layers
- · Sweater
- · Waterproof jacket
Winter
December – February
Coldest months with shorter days. Holiday markets and winter activities in many cities.
Packing tips
- · Warm coat
- · Scarf and gloves
- · Thermal layers
- · Waterproof boots
Keep reading
Sources
- GeoNames city database — CC BY 4.0, fetched September 14, 2026
- Open-Meteo climate archive — CC BY 4.0, fetched September 21, 2026
AI-written interpretation reviewed against the data above — claude-sonnet-5, generated September 21, 2026. Every number on this page comes from a dataset named here; the formulas are public.