Ulsan weather in September
September is a fair month to visit Ulsan: highs of 24°C (76°F) and about 168 mm (6.6 in) of rain on average. Nights average 20°C (68°F) and cloud cover 67% (NASA POWER, 2001–2025 averages). It is the 3rd wettest month of the year and the 3rd warmest. Compared with August, it is cooler and about as wet; October brings highs of 20°C (68°F) and 76 mm (3.0 in) of rain.
Figures are long-term averages for Ulsan, the largest city in Ulsan. See below for other places.
Is September a good time to visit Ulsan?
fair month Weather score 59/100.
September is a fair month in Ulsan. The weather is usually best in May, Oct.
Does it rain a lot in Ulsan in September?
Yes, it is one of the rainy months: about 168 mm (6.6 in) falls in an average September. It is the 3rd wettest month of the year.
How warm is Ulsan in September?
Days average 24°C (76°F) and nights 20°C (68°F).
Ulsan weather by month
| Month | High | Low | Rain | Cloud | Weather |
|---|---|---|---|---|---|
| January | 6°C (42°F) | 0°C (32°F) | 42 mm | 55% | least pleasant |
| February | 8°C (46°F) | 2°C (35°F) | 53 mm | 60% | least pleasant |
| March | 12°C (53°F) | 5°C (41°F) | 74 mm | 57% | least pleasant |
| April | 16°C (61°F) | 9°C (49°F) | 112 mm | 58% | fair |
| May | 20°C (69°F) | 14°C (57°F) | 118 mm | 62% | best |
| June | 23°C (74°F) | 18°C (65°F) | 150 mm | 73% | fair |
| July | 26°C (79°F) | 22°C (72°F) | 240 mm | 73% | least pleasant |
| August | 28°C (82°F) | 24°C (75°F) | 194 mm | 66% | fair |
| September | 24°C (76°F) | 20°C (68°F) | 168 mm | 67% | fair |
| October | 20°C (68°F) | 15°C (59°F) | 76 mm | 54% | best |
| November | 14°C (58°F) | 8°C (47°F) | 54 mm | 51% | fair |
| December | 8°C (46°F) | 2°C (35°F) | 42 mm | 52% | least pleasant |
Sources: 2001–2025 monthly averages from NASA POWER (MERRA-2 reanalysis). Page updated . How we rate months