Cheonan Weather in September
In Cheonan, September brings high daytime temperatures around 27°C (81°F), with nights cooling to 17°C (63°F). Expect quite a bit of rainfall this month.
Rainfall in Cheonan in September
You can expect rain on roughly 8 days based on historical data, averaging 144 mm (5.7 in) for the month. Individual showers can be quite heavy this month. A proper umbrella or rain jacket is worth having.
Temperature in Cheonan in September
In September, Cheonan sees high temperatures, with highs of 27°C (81°F). Nights drop to around 17°C (63°F). The days can feel warmer than the evenings, so packing for both parts of the day is a good idea. Nights drop to around 17°C (63°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 Cheonan in September
Expect a lot of sunshine this month, with about 197 hours of sun. These sunny conditions add to the overall experience.If you prefer enjoying temperate temperatures and rain-free days, April, May and October typically offer 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 Cheonan's climate page.
Cheonan Temperature in September
Min Temperature
17°C (63°F)
Max Temperature
27°C (81°F)
Chance of Rain
28%
Precipitation
144 mm (5.7 in)
Rainy days
8 days
Humidity
76%
Sunshine
197 hours
Percentage Sunshine
53%
Daily Historical Temperatures
50-year average (1976-2025)
Based on our historical records, temperatures in Cheonan 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 Cheonan in September
Browse day-by-day weather records for Cheonan spanning 51 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.
Cheonan historical weather extremes in September
According to our 49 years of weather records for Cheonan, the following extremes were recorded between 1976 and 2025.
- The hottest September day on record in Cheonan reached 34°C (93°F) (September 17, 2024).
- Cheonan experienced its chilliest September day on September 26, 1987, reaching only 16°C (61°F).
- The lowest overnight temperature recorded in September was 3°C (37°F) (September 27, 1987).
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
unpleasant
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What to Wear in Cheonan 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 Cheonan 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 Cheonan's climate page.
Temperature Rainfall Sunshine Humidity
See the full Cheonan climate overview or explore weather in South Korea.
