Incheon Weather in September
September in Incheon typically sees daytime highs of 26°C (79°F) and nighttime lows of 19°C (66°F). Rainfall is also possible this month, so it's worth packing an umbrella. It falls within the summer season.
Rainfall in Incheon in September
The climate data from previous years indicates about 8 days of rain, averaging 128 mm (5 in) for the month. The rain this month tends to fall in heavier spells rather than light drizzle. When it rains, showers can be significant.
Temperature in Incheon in September
September in Incheon brings high temperatures, with highs of 26°C (79°F) and nights around 19°C (66°F). September is in the summer season. Overall, the month follows a fairly predictable daily temperature pattern. Nights drop to around 19°C (66°F), which is noticeably cooler than the daytime. A light jacket for the evening is a sensible addition, and the cool nights tend to make sleeping comfortable.
Sunshine in Incheon in September
The days are predominantly sunny, with an estimated total of around 202 hours of sunshine. These sun-filled days are perfect for playing sports, visiting parks, or going for a bike ride.For Incheon itself, May and October generally stand 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 Incheon's climate page.
Incheon Temperature in September
Min Temperature
19°C (66°F)
Max Temperature
26°C (79°F)
Chance of Rain
28%
Precipitation
128 mm (5 in)
Rainy days
8 days
Humidity
71%
Sunshine
202 hours
Percentage Sunshine
Daily Historical Temperatures
50-year average (1976-2025)
Based on our historical records, temperatures in Incheon 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 13°C (55°F) to 20°C (68°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 for Incheon in September
Browse day-by-day weather records for Incheon spanning 51 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.
Incheon historical weather extremes in September
The extremes listed below come from historical weather data collected in Incheon from 1976 through 2025.
- On September 11, 2024, temperatures climbed to 34°C (93°F), marking the warmest September day on record.
- On September 26, 1987, Incheon saw its coldest September day with temperatures maxing out at 17°C (63°F).
- The coldest night in September in Incheon was on September 27, 1987, with a minimum of 5°C (41°F).
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
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tolerable
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What to Wear in Incheon 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. Prepare for significant rainfall with proper waterproof clothing and shoes. You'll definitely want to pack sunglasses and sunscreen. There will be plenty of bright sunshine this month.What To Do in Incheon in September
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 Incheon's climate page.
Temperature Rainfall Sunshine Humidity
See the full Incheon climate overview or explore weather in South Korea.
