Climate averages 1991–2020
Incheon weather
in May.
A mild, wet month: the 5th warmest and the 8th driest of the year. Meets the pleasant-weather rule
Long-term climate patterns, not a forecast for a particular trip.
May is a mild month in Incheon: daytime highs average 19.6°C and nights cool to about 11.8°C. By daytime temperature it is the 5th warmest of the 12 months.
Expect about 92 mm of rain on roughly 8 days, which makes May a wet month (the 8th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 14 h 10 min on an average May day.
The nearest other city in this atlas is Bucheon-si (8 km away). In May its highs average 20.6°C, 1.0°C warmer than Incheon, with 92 mm of rain.
Among the 79 cities listed in South Korea, Incheon ranks joint 73rd of 79 for the warmest May highs and joint 27th of 79 for the driest May (rainfall, lowest first). The mean May high of those 79 cities is 21.9°C; Incheon is 2.3°C cooler than that mean.
From May to June, average highs rise by 4.3°C to 23.9°C, and monthly rainfall rises from 92 mm to 122 mm.
The annual picture
May in context
Monthly precipitation
Average total · mmAverages from hourly ERA5 reanalysis data. Actual weather varies from year to year. How these numbers are calculated
Every month, side by side
Incheon climate table
| Month | Average highHigh / low | Average low | Precipitation mm/month | Wet days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 1.4°C-5.8°C | -5.8°C | 18 | 3.6 | 9.910 h |
| February | 3.7°C-4.1°C | -4.1°C | 24 | 3.9 | 10.811 h |
| March | 8.5°C0.2°C | 0.2°C | 36 | 5.5 | 11.912 h |
| April | 14.4°C6.1°C | 6.1°C | 65 | 7.0 | 13.113 h |
| May, selected | 19.6°C11.8°C | 11.8°C | 92 | 7.5 | 14.214 h |
| June | 23.9°C17.2°C | 17.2°C | 122 | 7.8 | 14.715 h |
| July | 26.4°C21.5°C | 21.5°C | 298 | 15.0 | 14.514 h |
| August | 27.6°C22.6°C | 22.6°C | 244 | 13.8 | 13.614 h |
| September | 24.0°C17.7°C | 17.7°C | 121 | 7.6 | 12.512 h |
| October | 18.1°C10.7°C | 10.7°C | 54 | 5.3 | 11.311 h |
| November | 10.6°C3.4°C | 3.4°C | 48 | 7.3 | 10.210 h |
| December | 3.6°C-3.5°C | -3.5°C | 22 | 5.0 | 9.610 h |
Precipitation (rain or snow, as water) is the average of the 30 separate monthly totals. A wet day is a local calendar day with at least 1 mm of precipitation. Daylight is the calculated sunrise-to-sunset length, not measured sunshine.
Compare places
May in nearby cities
- Bucheon-si in MaySouth Korea · 8 kmHigh 20.6°C · Low 11.9°C · 92 mm rain
- Gwangmyeong in MaySouth Korea · 14 kmHigh 21.3°C · Low 11.7°C · 92 mm rain
- Ansan-si in MaySouth Korea · 18 kmHigh 20.5°C · Low 11.9°C · 104 mm rain
- Gimpo-si in MaySouth Korea · 19 kmHigh 20.5°C · Low 12.1°C · 92 mm rain
- Anyang-si in MaySouth Korea · 21 kmHigh 20.7°C · Low 11.7°C · 96 mm rain
- Goyang-si in MaySouth Korea · 25 kmHigh 21.5°C · Low 11.6°C · 98 mm rain
- Seoul in MaySouth Korea · 27 kmHigh 22.0°C · Low 11.4°C · 96 mm rain
- Hwaseong-si in MaySouth Korea · 29 kmHigh 19.1°C · Low 12.0°C · 104 mm rain
Read the numbers correctly
Climate, not a promise.
These patterns help compare months. They cannot tell you the weather on a specific day of your trip.
Sources, method and limitsHow these numbers are made (what the highs, lows and rain days mean, the sources and the model cell used for Incheon) is explained once on the Incheon year overview and on the Sources, method and limits page.
Bucheon-si, Gwangmyeong and Gimpo-si lie in the same rainfall cell, so their rainfall figures are identical to these; temperatures differ because they come from smaller 0.1° cells.