Temperature
Warm by day, mild at night.
80°Ftypical September high
Typical range
September climate
September in Ulsan
South Korea · East Asia
Warm days and some sun. Heavier storm-season rain is the main drawback.
Some tradeoffs
Late
Daytime high
80°F
Lows around 69°F
Rain
Several rainy days
Sun
8 h/day
Air feel
Humid
When to visit
Month-by-month fit
Best
Precipitation
Several rainy days. About 12 wet days, more than in most months.
40%wet-day frequency
AmountWet-day chance
Sunshine
Cloudier spells limit sunshine.
8.1 hSeptember sunshine
Heat & humidity by month
Warm days, with humid periods.
57%September Heat feel
Easy airWarm airHot airHumid airVery humid air
Hourly temperature pattern
In September, afternoons feel about 79° and nights feel near 72°.
FreezingVery coldColdCoolComfortableWarmHotNight hours
Clear sky
Mostly cloudy skies this month.
35%September Clear sky
Clear skyCloud
Wind pattern
Calm winds are typical in September.
7 mphSeptember Light breeze
More detailIncludes daypart comfort
Typical September day
September late afternoons are around 78°F, easing to about 74°F in early evening.
Avg temp Typical range
Morning74°F
Rain23%
Cloud65%
Humid airHigh
Sun intensityModerate
Midday79°F
Rain27%
Cloud69%
Humid airHigh
Sun intensityStrong
Late afternoon78°F
Rain24%
Cloud66%
Humid airHigh
Sun intensityModerate
Early evening74°F
Feels 76°F
Rain16%
Cloud61%
Humid airHigh
Sun intensityMinimal
Best windowData tableView month-by-month numbers
View month-by-month numbers
| Month | High°F | Low°F | Rainin | Wet days | Sunh | Humidity% |
|---|---|---|---|---|---|---|
| Jan | 46 | 31 | 1.2 | 4 | 8.0 | 53 |
| Feb | 50 | 34 | 1.6 | 5 | 8.2 | 53 |
| Mar | 58 | 41 | 2.8 | 7 | 9.0 | 57 |
| Apr | 67 | 50 | 3.6 | 8 | 9.8 | 60 |
| May | 75 | 58 | 4.0 | 8 | 10.3 | 66 |
| Jun | 79 | 67 | 6.0 | 9 | 9.7 | 76 |
| Jul | 85 | 75 | 8.3 | 14 | 9.1 | 81 |
| Aug | 87 | 77 | 8.2 | 15 | 9.3 | 80 |
| Sep | 80 | 69 | 7.2 | 12 | 8.1 | 78 |
| Oct | 72 | 58 | 3.1 | 6 | 8.5 | 70 |
| Nov | 61 | 45 | 1.9 | 4 | 8.0 | 63 |
| Dec | 49 | 34 | 1.0 | 3 | 7.9 | 56 |
Similar climates
Similar
Similar travel styleTokyoJapanSimilar travel styleOsakaJapanSimilar travel styleShanghaiChinaSimilar travel styleSeoulSouth Korea
Want a side-by-side climate view? Compare Ulsan with Tokyo.
Climate data notePlanning guidance, not a forecast
Typical monthly values are based on long-term climate records. Useful for planning, not a forecast. Check the weather before you travel.
Sunshine: source type is not yet identified at metric level.
Local microclimates can vary by beach, neighborhood, trail, or elevation.
Last updated: Jul 27, 2026
Data & methodology