Asan Weather in September
September in Asan brings high temperatures, with highs of 27°C (81°F) and nights dropping to 17°C (63°F). Rainfall is on the higher side this month, averaging around 143 mm (5.6 in), so keep a rain jacket handy.
Rainfall in Asan in September
You can typically expect 8 days of rain this month, averaging around 143 mm (5.6 in). Individual showers can be quite heavy this month. A proper umbrella or rain jacket is worth having.
Temperature in Asan in September
In September, Asan sees high temperatures, with highs of 27°C (81°F). Nights drop to around 17°C (63°F). Conditions stay fairly consistent through the month, making it easier to plan what to wear. 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 Asan in September
The month enjoys around 197 hours of sunshine, creating mostly sunny days with good weather conditions.If you prefer dry days with pleasant temperatures, 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 Asan's climate page.
Asan Temperature in September
Min Temperature
17°C (63°F)
Max Temperature
27°C (81°F)
Chance of Rain
28%
Precipitation
143 mm (5.6 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 Asan 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 Asan in September
Browse day-by-day weather records for Asan spanning 51 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.
Asan historical weather extremes in September
The extremes listed below come from historical weather data collected in Asan from 1976 through 2025.
- On September 17, 2024, temperatures climbed to 35°C (95°F), marking the warmest September day on record.
- Asan 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
pleasant
tolerable
unpleasant
poor
What to Wear in Asan 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. Don't forget sun protection, sunglasses, sunscreen, and a hat. These are all good ideas with this much sunshine.What To Do in Asan 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 Asan's climate page.
Temperature Rainfall Sunshine Humidity
See the full Asan climate overview or explore weather in South Korea.
