South Korea (Seoul) · September
Best travel monthTravel seasonSouth Korea · Asia
Climate Overview
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
Ø day, range from coolest to warmest dayØ dayrange | 3° (37°)-5– (23–)9 (48) | 6° (43°)-4– (25–)13 (55) | 12° (54°)2– (36–)20 (68) | 18° (64°)10– (50–)27 (81) | 24° (75°)15– (59–)30 (86) | 28° (82°)21– (70–)33 (91) | 30° (86°)24– (75–)33 (91) | 31° (88°)24– (75–)35 (95) | 27° (81°)20– (68–)31 (88) | 21° (70°)12– (54–)27 (81) | 13° (55°)2– (36–)20 (68) | 4° (39°)-6– (21–)12 (54) |
Ø night, range from coldest to warmest nightØ nightrange | -7° (19°)-14– (7–)1 (34) | -4° (25°)-12– (10–)3 (37) | 1° (34°)-6– (21–)7 (45) | 8° (46°)1– (34–)13 (55) | 13° (55°)7– (45–)18 (64) | 19° (66°)13– (55–)23 (73) | 23° (73°)18– (64–)26 (79) | 24° (75°)17– (63–)27 (81) | 18° (64°)12– (54–)22 (72) | 10° (50°)1– (34–)17 (63) | 3° (37°)-6– (21–)11 (52) | -5° (23°)-13– (9–)4 (39) |
☀️Sunshine | 7h UV 5 | 8h UV 6 | 9h UV 7 | 8h UV 7 | 9h UV 8 | 8h UV 8 | 6h UV 6 | 6h UV 6 | 7h UV 6 | 7h UV 6 | 6h UV 5 | 6h UV 4 |
🌧Rain Days | 3d42mm (1.6") | 3d36mm (1.4") | 4d65mm (2.6") | 6d87mm (3.4") | 6d122mm (4.8") | 7d154mm (6.0") | 12d475mm (18.7") | 12d365mm (14.4") | 7d178mm (7.0") | 5d83mm (3.3") | 6d75mm (3.0") | 3d31mm (1.2") |
Best travel time current monthØ = average · small figures = range: coolest–warmest day / coldest–warmest nightClimate data 2005–2025 · Source: ERA5 + station data
Travel season — mid-range prices, good availability.
September is one of the best travel months for South Korea (Seoul) — conditions are stable, temperatures reach 27°C (81°F), and outdoor activities are excellent.
Daytime highs average 27°C (81°F), cooling to 18°C (64°F) at night (daily average: 22°C (72°F)). Peaks reach around 31°C (88°F), the coldest nights around 12°C (54°F). The sun shines an average of 7 hours per day; there are 7 rain days with 178 mm (7.0 in) total.
Summer clothing and a light jacket for evenings is enough. Conditions are ideal for excursions, hikes, and sightseeing.
The golden autumn: the air is clear and dry, and temperatures ease to a pleasant 20°C (68°F) in October. The leaves turn red and yellow from the end of October, and the mountains to the north of the city are well visited. By November it is already frosty, and the wind makes the streets feel cold.
Packing list for South Korea (Seoul) in September
- T-shirts and shorts
- Sunscreen
- Sunglasses
- Light umbrella or rain poncho
- Travel first-aid kit
Frequently Asked Questions
- Is September a good time to visit South Korea (Seoul)?
- Yes — September is one of the best months to visit South Korea (Seoul) (Climate Score: 69/100). Pleasant temperatures (27°C (81°F)), good sunshine (7 h/day), and few rain days (7) make it one of the most recommended months.
- How warm is it in South Korea (Seoul) in September?
- In September, South Korea (Seoul) sees daily highs of 27°C (81°F). Nights cool to 18°C (64°F), with a daily average of 22°C (72°F). Peaks reach around 31°C (88°F), the coldest nights around 12°C (54°F).
- How much rain falls in South Korea (Seoul) in September?
- In September, South Korea (Seoul) receives an average of 178 mm (7.0 in) of rain over 7 rain days. An umbrella may occasionally be needed.
- How many sunshine hours does South Korea (Seoul) get in September?
- South Korea (Seoul) averages 7 sunshine hours per day in September — close to the annual average.
