Seongnam Weather in May
With daytime temperatures of 24°C (75°F) and nighttime lows of 12°C (54°F), May in Seongnam brings high temperatures during the day. Do keep in mind that quite a bit of rainfall is typical. Around 101 mm (4 in) falls on average.
Rainfall in Seongnam in May
Rain is expected on roughly 8 days, totalling around 101 mm (4 in) for the month. When showers do arrive, they tend to be on the heavier side. Worth being prepared even if rain days are not that numerous.
Temperature in Seongnam in May
Expect highs of 24°C (75°F) in Seongnam in May, with nights dropping to around 12°C (54°F). The days can feel warmer than the evenings, so packing for both parts of the day is a good idea. At 12°C (54°F) overnight, it can feel quite a bit cooler after dark. Worth packing something warmer for evenings, but the cooler temperatures are ideal for sleeping.
Sunshine in Seongnam in May
There are approximately 225 hours of sunshine this month, resulting in mostly clear days.
Wind Speed in Seongnam in May
Wind speeds average 2 m/s (4 knots) during May. At this speed, expect light breezes that you can feel on your face and cause leaves to rustle gently. Since this is an average, some days are calmer with barely any wind while others have more noticeable gentle breezes.For Seongnam itself, October generally stands out with the best circumstances. If you're seeking pleasant, dry and sunny weather somewhere else in the world, our weather planner can help you explore other options.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit South Korea, check out our Seongnam's climate page.
Seongnam Temperature in May
Min Temperature
12°C (54°F)
Max Temperature
24°C (75°F)
Chance of Rain
27%
Precipitation
101 mm (4 in)
Rainy days
8 days
Humidity
58% *
Windspeed
2 m/s (4 knots) *
Sunshine
225 hours *
Percentage Sunshine
52% *
Daily Historical Temperatures
50-year average (1976-2025)
Based on our historical records, temperatures in Seongnam typically rise from around 22°C (72°F) at the start of May to approximately 26°C (79°F) by the end. Nights are cool, with lows typically ranging from 9°C (48°F) to 15°C (59°F).
Average temperatures in May
Daily Historical Precipitation
50-year average (1976-2025)
Average daily rainfall for each day of the month based on long-term records.
Average precipitation in May
Historical weather for Seongnam in May
Browse day-by-day weather records for Seongnam spanning 51 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.
Seongnam historical weather extremes in May
Our historical data for Seongnam spans 1976 to 2025, revealing these weather extremes.
- The hottest May day on record in Seongnam reached 34°C (93°F) (May 24, 2019).
- Seongnam experienced its chilliest May day on May 4, 1990, reaching only 13°C (55°F).
- Nighttime temperatures dropped to 3°C (37°F) on May 1, 2010, marking the coldest May night on record.
Best Places in South Korea in May
Find out more about the weather in South Korea and which places have the best travel conditions in this month. See all of South Korea in May →
perfect weather
pleasant
tolerable
unpleasant
poor
What to Wear in Seongnam in May
Comfortable temperatures call for an easy wardrobe in May. Pack summer basics like t-shirts and shorts, but include a light jacket for cooler moments. A pair of comfortable walking shoes is essential. Expect heavy rainfall, so bring good rain protection and waterproof bags. You'll definitely want to pack sunglasses and sunscreen. There will be plenty of bright sunshine this month.What To Do in Seongnam in May
We rated the following activities from 1 (least suitable) to 10 (best) to do.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit South Korea, check out our Seongnam's climate page.
Temperature Rainfall Sunshine Humidity Wind Speed
See the full Seongnam climate overview or explore weather in South Korea.
