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.
Gapyeong Weather in September
Gapyeong in September averages 26°C (79°F) during the day and 15°C (59°F) at night. Keep in mind that quite a bit of rainfall is expected this month.
Rainfall in Gapyeong in September
Analyzing past climate data, one can expect approximately 9 days of rain, averaging 138 mm (5.4 in). Individual showers can be quite heavy this month. A proper umbrella or rain jacket is worth having.
Temperature in Gapyeong in September
Daytime highs in Gapyeong in September reach 26°C (79°F), with nights around 15°C (59°F). Overall, the month follows a fairly predictable daily temperature pattern. At 15°C (59°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 Gapyeong in September
You can expect a moderate amount of sunlight, with approximately 182 hours. This means a pleasant mix of sun and overcast.If you prefer enjoying temperate temperatures and rain-free days, October typically offers 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.
Gapyeong Temperature in September
Min Temperature
15°C (59°F)
Max Temperature
26°C (79°F)
Chance of Rain
29%
Precipitation
138 mm (5.4 in)
Rainy days
9 days
Humidity
67% *
Sunshine
182 hours *
Percentage Sunshine
48% *
* Data from: Seoul, South Korea (56 KM, 34 Miles).
Gapyeong Weather by Month
Pick a month to see the average temperature, rainfall and sunshine in Gapyeong - and find the best time to visit.
Daily Historical Temperatures
50-year average (1976-2025)
Based on our historical records, temperatures in Gapyeong 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 12°C (54°F) to 19°C (66°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 Gapyeong in September
Browse day-by-day weather records for Gapyeong spanning 51 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.
Gapyeong historical weather extremes in September
Based on 50 years of weather observations (1976-2026), these are the most extreme conditions recorded in Gapyeong.
- The warmest day in September was on September 5, 2001, with a maximum of 33°C (91°F).
- The lowest daytime temperature in September was 16°C (61°F), recorded on September 25, 1997.
- Nighttime temperatures dropped to 2°C (36°F) on September 27, 1987, marking the coldest September night on record.
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 Gapyeong in September
Warm but pleasant conditions in Gapyeong in September. Focus on lightweight, maybe with natural fabrics, cotton blend shirts, comfortable shorts, and breathable footwear. A light cover-up for sun protection is smart too. Expect heavy rainfall, so bring good rain protection and waterproof bags. It won't hurt to bring your sunglasses along, as you'll see some sunny periods.
What To Do in Gapyeong in September
We rated the following activities from 1 (least suitable) to 10 (best) to do.
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Swimming7/10 -
Cycling7/10 -
Walking7/10 -
Camping6/10 -
Outdoor sports7/10
Gapyeong 3-Day Forecast
More climate data for Gapyeong
Temperature Rainfall Sunshine Humidity
See the full Gapyeong 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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