Climate averages 1991–2020
Jeju City weather
in May.
A mild, wet month: the 6th warmest and the 8th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
May is a mild month in Jeju City: daytime highs average 20.1°C and nights cool to about 15.5°C. By daytime temperature it is the 6th warmest of the 12 months.
Expect about 109 mm of rain on roughly 9 days, which makes May a wet month (the 8th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 13 h 52 min on an average May day.
The nearest other city in this atlas is Seogwipo (29 km away). In May its highs average 22.0°C, 1.9°C warmer than Jeju City, with 132 mm of rain.
Among the 79 cities listed in South Korea, Jeju City ranks 68th of 79 for the warmest May highs and joint 64th of 79 for the driest May (rainfall, lowest first). The mean May high of those 79 cities is 21.9°C; Jeju City is 1.8°C cooler than that mean.
From May to June, average highs rise by 3.3°C to 23.5°C, and monthly rainfall rises from 109 mm to 189 mm.
The annual picture
May in context
Monthly rainfall
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
Jeju City climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 8.0°C4.7°C | 4.7°C | 73 | 11.7 | 10.210 h |
| February | 9.1°C5.0°C | 5.0°C | 65 | 9.4 | 11.011 h |
| March | 12.2°C7.5°C | 7.5°C | 94 | 10.3 | 12.012 h |
| April | 16.4°C11.4°C | 11.4°C | 102 | 8.9 | 13.013 h |
| May, selected | 20.1°C15.5°C | 15.5°C | 109 | 8.8 | 13.914 h |
| June | 23.5°C19.7°C | 19.7°C | 189 | 11.5 | 14.314 h |
| July | 27.6°C24.3°C | 24.3°C | 184 | 12.1 | 14.114 h |
| August | 28.7°C25.7°C | 25.7°C | 168 | 13.7 | 13.413 h |
| September | 25.3°C22.3°C | 22.3°C | 165 | 11.1 | 12.412 h |
| October | 20.7°C17.4°C | 17.4°C | 79 | 6.7 | 11.411 h |
| November | 15.8°C11.9°C | 11.9°C | 70 | 8.8 | 10.510 h |
| December | 10.5°C6.8°C | 6.8°C | 68 | 11.0 | 10.010 h |
Rainfall is the average of the 30 separate monthly totals. A rain 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
- Seogwipo in MaySouth Korea · 29 kmHigh 22.0°C · Low 15.3°C · 132 mm rain
- Mokpo in MaySouth Korea · 145 kmHigh 19.6°C · Low 12.7°C · 102 mm rain
- Muan in MaySouth Korea · 165 kmHigh 21.8°C · Low 12.4°C · 92 mm rain
- Yeosu in MaySouth Korea · 174 kmHigh 19.7°C · Low 14.4°C · 147 mm rain
- Masan in MaySouth Korea · 182 kmHigh 23.0°C · Low 12.0°C · 97 mm rain
- Suncheon in MaySouth Korea · 183 kmHigh 23.1°C · Low 13.5°C · 138 mm rain
- Gwangju in MaySouth Korea · 186 kmHigh 23.0°C · Low 11.9°C · 99 mm rain
- Kwangyang in MaySouth Korea · 190 kmHigh 22.6°C · Low 13.7°C · 138 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 Jeju City) is explained once on the Jeju City year overview and on the Sources, method and limits page.