Home › Cities › South Korea › Incheon
Incheon, South Korea climate
Cwa Monsoon-influenced humid subtropical
Incheon has a strongly seasonal cool-temperate climate (Monsoon-influenced humid subtropical, Köppen Cwa). The hottest month is August with an average daily high near 29°C, while the coldest is January averaging around −6°C at night. Precipitation totals about 1284 mm a year and is strongly seasonal — August alone averages 327 mm while January barely receives 12 mm.
Temperature & precipitation
Daily high–low temperature range with the monthly average, plus monthly precipitation · 1991–2020 normals · hover a month for the exact figuresClear vs cloudy days
Share of days each month that are clear, partly cloudy or cloudy · 1991–2020 · hover a month for the day countsIncheon climate normals (1991–2020)
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high (°C) | 2 | 5 | 10 | 16 | 22 | 26 | 28 | 29 | 26 | 20 | 12 | 5 |
| Avg temp (°C) | −2 | 1 | 6 | 12 | 17 | 22 | 25 | 26 | 22 | 16 | 8 | 1 |
| Avg low (°C) | −6 | −3 | 1 | 7 | 13 | 18 | 21 | 22 | 18 | 11 | 4 | −3 |
| Precipitation (mm) | 12 | 23 | 41 | 63 | 113 | 114 | 323 | 327 | 132 | 62 | 51 | 22 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Avg high (°C) | 2 | 5 | 10 | 16 | 22 | 26 |
| Avg temp (°C) | −2 | 1 | 6 | 12 | 17 | 22 |
| Avg low (°C) | −6 | −3 | 1 | 7 | 13 | 18 |
| Precipitation (mm) | 12 | 23 | 41 | 63 | 113 | 114 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Avg high (°C) | 28 | 29 | 26 | 20 | 12 | 5 |
| Avg temp (°C) | 25 | 26 | 22 | 16 | 8 | 1 |
| Avg low (°C) | 21 | 22 | 18 | 11 | 4 | −3 |
| Precipitation (mm) | 323 | 327 | 132 | 62 | 51 | 22 |
How often — frequency of weather events
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Days with measurable rain (days) | 4 | 4 | 4 | 6 | 6 | 7 | 13 | 10 | 7 | 5 | 6 | 5 |
| Days with high ≥ 32°C (days) | — | — | — | 0.0 | — | 0.2 | 2 | 4 | 0.2 | — | — | — |
| Days with low ≤ 0°C (days) | 20 | 17 | 7 | 0.1 | — | — | — | — | — | 0.1 | 5 | 17 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Days with measurable rain (days) | 4 | 4 | 4 | 6 | 6 | 7 |
| Days with high ≥ 32°C (days) | — | — | — | 0.0 | — | 0.2 |
| Days with low ≤ 0°C (days) | 20 | 17 | 7 | 0.1 | — | — |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Days with measurable rain (days) | 13 | 10 | 7 | 5 | 6 | 5 |
| Days with high ≥ 32°C (days) | 2 | 4 | 0.2 | — | — | — |
| Days with low ≤ 0°C (days) | — | — | — | 0.1 | 5 | 17 |
Sky & atmosphere
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Cloud cover (%) | 51 | 50 | 52 | 55 | 58 | 67 | 75 | 65 | 56 | 46 | 52 | 51 |
| Clear days (≤ 30% cloud) | 8 | 8 | 9 | 8 | 8 | 4 | 2 | 5 | 8 | 12 | 8 | 8 |
| Partly cloudy days (30–70%) | 14 | 12 | 13 | 10 | 10 | 10 | 8 | 10 | 10 | 12 | 12 | 14 |
| Cloudy days (≥ 70%) | 9 | 8 | 10 | 12 | 13 | 16 | 20 | 16 | 12 | 8 | 10 | 9 |
| Relative humidity (%) | 76 | 74 | 74 | 74 | 75 | 78 | 85 | 84 | 79 | 75 | 76 | 77 |
| Wind speed (mph) | 7.3 | 7.3 | 7.2 | 6.9 | 6.2 | 5.1 | 6.0 | 5.7 | 5.7 | 6.0 | 6.8 | 7.3 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 51 | 50 | 52 | 55 | 58 | 67 |
| Clear days (≤ 30% cloud) | 8 | 8 | 9 | 8 | 8 | 4 |
| Partly cloudy days (30–70%) | 14 | 12 | 13 | 10 | 10 | 10 |
| Cloudy days (≥ 70%) | 9 | 8 | 10 | 12 | 13 | 16 |
| Relative humidity (%) | 76 | 74 | 74 | 74 | 75 | 78 |
| Wind speed (mph) | 7.3 | 7.3 | 7.2 | 6.9 | 6.2 | 5.1 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 75 | 65 | 56 | 46 | 52 | 51 |
| Clear days (≤ 30% cloud) | 2 | 5 | 8 | 12 | 8 | 8 |
| Partly cloudy days (30–70%) | 8 | 10 | 10 | 12 | 12 | 14 |
| Cloudy days (≥ 70%) | 20 | 16 | 12 | 8 | 10 | 9 |
| Relative humidity (%) | 85 | 84 | 79 | 75 | 76 | 77 |
| Wind speed (mph) | 6.0 | 5.7 | 5.7 | 6.0 | 6.8 | 7.3 |
Methodology & sources
Temperature & precipitation — 1991–2020 normals computed from 25 years of daily observations at Incheon, a weather station, about 6 km from the city centre. The underlying daily records come from NOAA's global station network.
Cloud, humidity, wind & sunshine — modelled estimates from NASA POWER, NASA's satellite-and-reanalysis climatology. This is the standard global source for atmospheric variables, which are not measured at most weather stations.