Cheongju Weather in September
During September, Cheongju experiences high daytime temperatures of 27°C (81°F) and cooler nights around 17°C (63°F). Expect quite a bit of rainfall. Around 145 mm (5.7 in) is typical.
Rainfall in Cheongju in September
On average, there are about 9 days with rain during this month, averaging 145 mm (5.7 in). Rainfall intensity is on the higher side this month. Expect more substantial showers rather than light, passing rain.
Temperature in Cheongju in September
Daytime temperatures in Cheongju reach 27°C (81°F) in September, dropping to 17°C (63°F) at night. This gives the month a fairly typical daily rhythm, with warmer afternoons and more comfortable nights. 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 Cheongju in September
You can expect a moderate amount of sunlight, with approximately 177 hours. This means a pleasant mix of sun and overcast.For Cheongju itself, April, 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 Cheongju's climate page.
Cheongju Temperature in September
Min Temperature
17°C (63°F)
Max Temperature
27°C (81°F)
Chance of Rain
29%
Precipitation
145 mm (5.7 in)
Rainy days
9 days
Humidity
74%
Sunshine
177 hours
Percentage Sunshine
47%
Daily Historical Temperatures
50-year average (1976-2025)
Based on our historical records, temperatures in Cheongju 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 Cheongju in September
Browse day-by-day weather records for Cheongju spanning 51 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.
Cheongju historical weather extremes in September
Based on 49 years of weather observations in Cheongju between 1976 and 2025, these are the recorded extremes.
- Cheongju recorded its highest September temperature of 35°C (95°F) on September 10, 2024.
- The coldest September day was on September 26, 1987, with a maximum of 17°C (63°F).
- The lowest overnight temperature recorded in September was 4°C (39°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
pleasant
tolerable
unpleasant
poor
What to Wear in Cheongju in September
Warm weather calls for comfortable, breathable clothing in September. Cotton t-shirts, shorts, light dresses, and sandals are perfect. You might still want a light layer for evenings or air-conditioned places (for example buses). High rain levels are expected, so pack waterproof gear and an umbrella or poncho. It won't hurt to bring your sunglasses along, as you'll see some sunny periods.What To Do in Cheongju 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 Cheongju's climate page.
Temperature Rainfall Sunshine Humidity
See the full Cheongju climate overview or explore weather in South Korea.
