Climate averages 1991–2020
Seongnam-si weather
in May.
A mild, wet month: the 5th 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 Seongnam-si: daytime highs average 21.8°C and nights cool to about 11.3°C. By daytime temperature it is the 5th warmest of the 12 months.
Expect about 104 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 14 h 10 min on an average May day.
The nearest other city in this atlas is Gwangju, South Korea (11 km away). In May its highs average 22.6°C, 0.8°C warmer than Seongnam-si, with 104 mm of rain.
Among the 79 cities listed in South Korea, Seongnam-si ranks joint 51st of 79 for the warmest May highs and joint 56th of 79 for the driest May (rainfall, lowest first). The mean May high of those 79 cities is 21.9°C; Seongnam-si is 0.1°C cooler than that mean.
From May to June, average highs rise by 4.3°C to 26.1°C, and monthly rainfall rises from 104 mm to 134 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
Seongnam-si climate table
| Month | Average highHigh / low | Average low | Precipitation mm/month | Wet days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 1.7°C-6.3°C | -6.3°C | 20 | 3.8 | 9.910 h |
| February | 4.5°C-4.5°C | -4.5°C | 29 | 4.2 | 10.811 h |
| March | 9.9°C-0.4°C | -0.4°C | 43 | 6.4 | 11.912 h |
| April | 16.4°C5.4°C | 5.4°C | 79 | 7.3 | 13.113 h |
| May, selected | 21.8°C11.3°C | 11.3°C | 104 | 8.5 | 14.214 h |
| June | 26.1°C16.9°C | 16.9°C | 134 | 9.3 | 14.715 h |
| July | 27.8°C21.3°C | 21.3°C | 340 | 17.2 | 14.514 h |
| August | 28.4°C21.9°C | 21.9°C | 277 | 15.7 | 13.614 h |
| September | 24.5°C16.5°C | 16.5°C | 134 | 8.4 | 12.512 h |
| October | 18.5°C9.2°C | 9.2°C | 58 | 5.5 | 11.311 h |
| November | 10.8°C2.1°C | 2.1°C | 50 | 7.2 | 10.210 h |
| December | 3.7°C-4.3°C | -4.3°C | 25 | 4.7 | 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
- Gwangju, South Korea in MaySouth Korea · 11 kmHigh 22.6°C · Low 11.6°C · 104 mm rain
- Hanam in MaySouth Korea · 13 kmHigh 22.3°C · Low 11.5°C · 104 mm rain
- Guri-si in MaySouth Korea · 18 kmHigh 22.2°C · Low 11.6°C · 104 mm rain
- Wabu in MaySouth Korea · 18 kmHigh 22.2°C · Low 11.4°C · 104 mm rain
- Anyang-si in MaySouth Korea · 19 kmHigh 20.7°C · Low 11.7°C · 96 mm rain
- Seoul in MaySouth Korea · 20 kmHigh 22.0°C · Low 11.4°C · 96 mm rain
- Suwon in MaySouth Korea · 20 kmHigh 21.6°C · Low 11.3°C · 88 mm rain
- Gwangmyeong in MaySouth Korea · 24 kmHigh 21.3°C · Low 11.7°C · 92 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 Seongnam-si) is explained once on the Seongnam-si year overview and on the Sources, method and limits page.
Hanam, Guri-si and Wabu lie in the same rainfall cell, so their rainfall figures are identical to these; temperatures differ because they come from smaller 0.1° cells.