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.
Gunsan Weather in September
Gunsan in September sees high daytime temperatures of 27°C (81°F) and nighttime lows of 20°C (68°F). Rainfall is fairly high this month at around 155 mm (6.1 in), so pack a rain jacket to stay dry.
Rainfall in Gunsan in September
Historically, approximately 9 days this month are expected to have rain, averaging 155 mm (6.1 in). Rainfall intensity is on the higher side this month. Expect more substantial showers rather than light, passing rain.
Temperature in Gunsan in September
Daytime temperatures in Gunsan reach 27°C (81°F) in September, dropping to 20°C (68°F) at night. September is typically considered a summer month. This kind of day-to-night contrast is typical for this time of year. With lows of 20°C (68°F), nights are cool. If you're out after dark, an extra layer will keep you comfortable. The cooler air at night is also great for getting a good rest.
Sunshine in Gunsan in September
With approximately 217 hours of sunshine, the days are filled with clear skies. It makes it a perfect month for being outside.If your ideal day consists of dry skies and pleasant temperatures, May and October typically offer the best circumstances for Gunsan.
Gunsan Temperature in September
Min Temperature
20°C (68°F)
Max Temperature
27°C (81°F)
Chance of Rain
28%
Precipitation
155 mm (6.1 in)
Rainy days
9 days
Humidity
78% *
Sunshine
217 hours *
Percentage Sunshine
58% *
* Data from: Buan, South Korea (44 KM, 27 Miles).
Gunsan Weather by Month
Pick a month to see the average temperature, rainfall and sunshine in Gunsan - and find the best time to visit.
Daily Historical Temperatures
50-year average (1976-2025)
Based on our historical records, temperatures in Gunsan typically drop from around 28°C (82°F) at the start of September to approximately 24°C (75°F) by the end. Nights are pleasant, with lows typically ranging from 15°C (59°F) to 21°C (70°F).
Average temperatures in September
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 September
Historical weather records for Gunsan in September
Browse day-by-day weather records for Gunsan spanning 51 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.
Gunsan historical weather extremes in September
The extremes listed below come from historical weather data collected in Gunsan from 1976 through 2026.
- The warmest day in September was on September 19, 2024, with a maximum of 35°C (95°F).
- The lowest daytime temperature in September was 18°C (64°F), recorded on September 26, 1987.
- The lowest overnight temperature recorded in September was 8°C (46°F) (September 22, 1997).
Best Places in South Korea in September
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 September →
perfect weather
pleasant
tolerable
unpleasant
poor
Perfect weather is subjective. On this map perfect weather has been defined with temperatures between 20°C (68°F) and 29°C (84°F) and not too much precipitation (less than 90 mm (3.5 in) a month).
What to Wear in Gunsan in September
Warm temperatures in September make for comfortable sightseeing weather. Pack breathable fabrics like cotton shirts, knee-length shorts or skirts, and comfortable walking shoes. A thin long sleeve for indoor spaces is handy. Heavy rain is guaranteed, please bring a good poncho and waterproof everything! Don't forget sun protection, sunglasses, sunscreen, and a hat. These are all good ideas with this much sunshine.
What To Do in Gunsan in September
We rated the following activities from 1 (least suitable) to 10 (best) to do.
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Swimming8/10 -
Cycling7/10 -
Walking7/10 -
Camping6/10 -
Outdoor sports7/10
Gunsan 3-Day Forecast
More climate data for Gunsan
Temperature Rainfall Sunshine Humidity
See the full Gunsan climate overview or explore weather in South Korea.
Popular in September
Where to go in September - average daytime high across popular destinations.
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Mud festival in South Korea
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