Seoul Weather in May
South Korea · Humid Continental climate · Data averaged from 2020-01-01 to 2024-12-31 (5 years)
May in Seoul sees average temperatures ranging from a low of 11.6°C (52.9°F) to a high of 22.2°C (72.0°F), with a mean of 16.5°C (61.7°F). Compared to the annual average of 11.9°C (53.4°F), this month is 4.6°C warmer than the yearly norm. Precipitation averages 128.4mm, making it approximately 2.0mm wetter than the monthly average of 126.0mm. The city receives an average of 9.5 hours of sunshine per day during May, with relative humidity averaging 70.6%. Wind speeds reach an average maximum of 18.6 km/h. For travelers, this month offers a temperature experience in Seoul, with wetter-than-average conditions compared to the rest of the year.
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.
May vs Adjacent Months
| Metric | April | May | June |
|---|---|---|---|
| Mean Temp | 11.9°C (53.4°F) | 16.5°C (61.7°F) | 21.9°C (71.4°F) |
| Rainfall | 57.7mm | 128.4mm | 176.5mm |
| Sunshine | 9.2 hrs | 9.5 hrs | 9.2 hrs |
| Humidity | 63.5% | 70.6% | 75.5% |
| Wind | 19.7 km/h | 18.6 km/h | 17.5 km/h |
| Rainy Days | 9.2 | 12.2 | 17.4 |
Seasonal Context
May falls in Spring in the Northern Hemisphere. Spring is a transitional season with temperatures rising from winter lows. For travelers visiting Seoul in May, the data indicates mixed conditions based on the combination of temperature, precipitation, and daylight hours.
Frequently Asked Questions
What is the average temperature in Seoul in May?
The average temperature in Seoul during May ranges from 11.6°C (52.9°F) to 22.2°C (72.0°F), with a mean of 16.5°C (61.7°F).
How much does it rain in Seoul in May?
Seoul receives an average of 128.4mm of precipitation in May, spread across approximately 12.2 rainy days.
What should I pack for Seoul in May?
Based on May weather data, pack layers including light jackets and t-shirts, plus an umbrella. Rain gear is essential — this month averages 128.4mm of precipitation.
Is May a good time to visit Seoul?
May is a month with challenging conditions. Plan activities carefully and stay hydrated.
Other Months for Seoul
Cities with Similar May Climate (Humid Continental)
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.