Temperature
Pleasant by day, mild at night.
78°Ftypical September high
Typical range
September climate
September in Incheon
South Korea · East Asia
Warm days and plenty of sun. Typhoon risk near peak is the main drawback.
Some tradeoffs
Afternoons can feel muggy.
Daytime high
78°F
Lows around 65°F
Rain
Several rainy days
Sun
8.5 h/day
Air feel
Humid
Sea temp
74°F
Warm sea
When to visit
Month-by-month fit
Best
Precipitation
Several rainy days. About 8 wet days, more than in most months.
27%wet-day frequency
AmountWet-day chance
Sunshine
A mix of sunshine and cloud.
8.6 hSeptember sunshine
Heat & humidity by month
Warm days, with humid periods.
45%September Heat feel
Easy airWarm airHumid airVery humid air
Hourly temperature pattern
In September, afternoons feel about 78° and nights feel near 68°.
FrigidFreezingVery coldColdCoolComfortableWarmHotNight hours
Clear sky
Partly cloudy skies this month.
43%September Clear sky
Clear skyCloud
Wind pattern
Calm winds are typical in September.
6 mphSeptember Calm
Sea temperature
74°FSeptember sea temp
More detailIncludes daypart comfort
Typical September day
September late afternoons are around 77°F, easing to about 72°F in early evening.
Avg temp Typical range
Morning70°F
Rain16%
Cloud59%
Humid airModerate
Sun intensityLow
Best windowMidday77°F
Rain16%
Cloud56%
Humid airModerate
Sun intensityStrong
Late afternoon77°F
Rain14%
Cloud54%
Humid airModerate
Sun intensityModerate
Early evening72°F
Feels 73°F
Rain11%
Cloud53%
Humid airModerate
Sun intensityMinimal
Data tableView month-by-month numbers
View month-by-month numbers
| Month | High°F | Low°F | Rainin | Wet days | Sunh | Humidity% | Sea°F |
|---|---|---|---|---|---|---|---|
| Jan | 35 | 21 | 0.8 | 4 | 7.8 | 64 | 44 |
| Feb | 40 | 25 | 0.9 | 4 | 8.6 | 65 | 41 |
| Mar | 50 | 35 | 1.5 | 5 | 9.3 | 67 | 42 |
| Apr | 61 | 46 | 2.7 | 7 | 9.9 | 69 | 47 |
| May | 70 | 56 | 3.6 | 8 | 9.8 | 75 | 55 |
| Jun | 77 | 66 | 5.1 | 9 | 9.7 | 80 | 65 |
| Jul | 82 | 73 | 11.7 | 15 | 7.8 | 85 | 73 |
| Aug | 84 | 74 | 9.5 | 15 | 8.7 | 83 | 78 |
| Sep | 78 | 65 | 5.1 | 8 | 8.6 | 78 | 74 |
| Oct | 67 | 52 | 2.2 | 6 | 8.9 | 73 | 67 |
| Nov | 53 | 38 | 1.8 | 7 | 7.4 | 70 | 59 |
| Dec | 39 | 25 | 0.9 | 5 | 7.5 | 67 | 50 |
Similar climates
Similar
Similar travel styleBarcelonaSpainSimilar travel styleCefaluItalySimilar travel styleSeoulSouth KoreaSimilar travel styleTianjinChina
Want a side-by-side climate view? Compare Incheon with Barcelona.
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: Jun 1, 2026
Data & methodology