Mud festival in South Korea
In July, the peaceful seaside town of Boryeong turned into a chaos of mud for 9 days. We recommend putting this festival on your bucket list.
Seongnam Weather & Climate: Best Time to Visit
Average temperatures, rainfall, sunshine and the best time to visit Seongnam.
–
Climate overview of Seongnam
Seongnam, Gyeonggi-do, South Korea, sees big temperature differences between seasons, with August peaking at 31°C (88°F) and January dropping to 3°C (37°F).
The city has a wet climate, receiving around 1281 mm (50 in) of rain/snowfall per year. Despite the high annual total, it has a distinct dry season from December to February, with very warm summers and cold winters. July is the wettest month. The sunniest month is May, with 7.5 hours of sunshine per day on average.
Seongnam Weather by Month
Pick a month to see the average temperature, rainfall and sunshine in Seongnam - and find the best time to visit.
Monthly Temperature in Seongnam
Visitors to Seongnam can expect significant temperature changes throughout the year. On average, daytime temperatures range from a very warm 31°C (88°F) in August to a chilly 3°C (37°F) in January.
Nighttime temperatures range from 22°C (72°F) in August to -7°C (19°F) in January.
Check out our detailed temperature page for more information.
Temperature ranges by month
Rainfall in Seongnam
Seongnam is known for its substantial rain/snowfall, with annual precipitation reaching 1281 mm (50 in). The seasons in Seongnam bring significant changes in precipitation. The wettest month, July, receives heavy rainfall, with an average of 324 mm (13 in) of precipitation. This rainfall is distributed across 16 rainy days.
In contrast, the driest month, January, experiences much less snow/rainfall, totaling 23 mm (0.9 in) over 7 snowy/rainy days. These distinct seasonal differences provide diverse experiences throughout the year. For more details, please visit our Seongnam Precipitation page.
The mean monthly precipitation over the year, including rain, hail, and snow
The average number of days each month with precipitation
Sunshine Hours in Seongnam
In Seongnam, summer days are longer and more sunny, with daily sunshine hours peaking at 7.5 hours in May. As the darker season arrives, the brightness of the sun becomes less. July sees a soft sun for only 4.1 hours per average day.
Visit our detailed sunshine hours page for more information.
Monthly hours of sunshine
Data from: Seoul, South Korea (20 KM, 12 Miles).
Daily hours of sunshine
Data from: Seoul, South Korea (20 KM, 12 Miles).
Daily percentage of sunshine
Data from: Seoul, South Korea (20 KM, 12 Miles).
Humidity in Seongnam by Month
The relative humidity is high throughout the year in Seongnam.
The city experiences its highest humidity in July, reaching 77%. In February, the humidity drops to its lowest level at 54%. What does this mean? Read our detailed page on humidity levels for further details.
Relative humidity over the year
Data from: Seoul, South Korea (20 KM, 12 Miles).
Wind Speed in Seongnam
The average wind speed over the year ranges from 2 m/s (4 knots) to 3 m/s (6 knots). It is lower in January, February, March, May, June, July, August, September, October, November and December and higher in April. What does this mean?
The mean monthly wind speed over the year (meters per second)
Data from: Seoul, South Korea (20 KM, 12 Miles).
Best Time to Visit Seongnam
For comfortable weather, consider visiting Seongnam in October. Conditions are usually least favourable in January, February, July and August.
Monthly ratings reflect general weather comfort, based on daytime temperature and rainfall. Swimming and winter conditions are highlighted separately where relevant.
Jan
cold
Feb
cold
Mar
mixed
Apr
very good
May
very good
Jun
very good
Jul
very wet
Aug
very wet
Sep
very good
Oct
excellent
Nov
mixed
Dec
mixed
- Best overall: October
- Warmest weather: July and August
- Most sunshine: May
- Wettest months: June, July, August and September, when rainfall is highest.
- Seasonal pattern: A distinct dry season from December to February, with very warm summers and cold winters
- Coldest conditions: January, with freezing nights around -7°C (19°F).
Frequently asked questions about the climate in Seongnam
What is the best time to visit Seongnam?
October typically offers the most optimal weather in Seongnam. In contrast, January, February, July and August tend to have less optimal conditions. Seongnam has a distinct dry season from December to February, with very warm summers and cold winters.
What temperatures can I expect in Seongnam?
Daytime highs range from 3°C (37°F) in January to 31°C (88°F) in August. Nighttime lows range from -7°C (19°F) to 22°C (72°F). Temperatures vary considerably through the year.
How much rain does Seongnam get?
Annual rainfall is around 1281 mm (50 in). July is the wettest month with 324 mm (13 in), while January is the driest with 23 mm (0.9 in).
How sunny is Seongnam?
Seongnam receives around 2,148 hours of sunshine per year. May is the sunniest month with 225 hours, while July is the cloudiest with just 124 hours. Overall, Seongnam enjoys abundant sunshine.
Seongnam 3-Day Forecast
Seongnam on the map
Seongnam is highlighted - select any city to see its climate.
Popular in October
Where to go in October - average daytime high across popular destinations.
Bucket list
Need travel inspiration? Check out our bucket list articles and be inspired.
Mud festival in South Korea
10 Hidden gems in Asia you need to visit
Explore 10 hidden gems in Asia offering authentic experiences, from pristine beaches and remote islands to cultural treks and peaceful mountain villages.
Chase the autumn leaves in Japan
Japan is one of these cases which turns into a gold, yellow and orange fairy tale starting from September. And we can honestly say: We cannot imagine a more beautiful season to visit Japan.
The 10 Most Exquisite Beaches in the Philippines
Explore the top 10 breathtaking beaches in the Philippines, from serene Nacpan Beach to volcanic Camiguin Island, in our detailed guide.