Climate averages 1991–2020
Osan weather
in June.
A warm, wet month: the 3rd warmest and the 9th driest of the year. Meets the pleasant-weather rule
Long-term climate patterns, not a forecast for a particular trip.
June is a warm month in Osan: daytime highs average 26.5°C and nights cool to about 17.1°C. By daytime temperature it is the 3rd warmest of the 12 months.
Expect about 118 mm of rain on roughly 8 days, which makes June a wet month (the 9th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 14 h 40 min on an average June day.
The nearest other city in this atlas is Suwon (16 km away). In June its highs average 25.9°C, 0.6°C cooler than Osan, with 118 mm of rain.
Among the 79 cities listed in South Korea, Osan ranks joint 28th of 79 for the warmest June highs and joint 7th of 79 for the driest June (rainfall, lowest first). The mean June high of those 79 cities is 25.7°C; Osan is 0.7°C warmer than that mean.
From June to July, average highs rise by 1.7°C to 28.2°C, and monthly rainfall rises from 118 mm to 279 mm.
The annual picture
June 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
Osan climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 2.2°C-5.5°C | -5.5°C | 20 | 3.8 | 9.910 h |
| February | 4.9°C-3.8°C | -3.8°C | 27 | 4.1 | 10.811 h |
| March | 10.2°C0.1°C | 0.1°C | 39 | 6.1 | 11.912 h |
| April | 16.8°C5.7°C | 5.7°C | 69 | 7.1 | 13.113 h |
| May | 22.2°C11.6°C | 11.6°C | 88 | 7.1 | 14.114 h |
| June, selected | 26.5°C17.1°C | 17.1°C | 118 | 7.6 | 14.715 h |
| July | 28.2°C21.6°C | 21.6°C | 279 | 15.3 | 14.414 h |
| August | 28.8°C22.3°C | 22.3°C | 231 | 14.0 | 13.614 h |
| September | 24.8°C16.9°C | 16.9°C | 124 | 7.8 | 12.512 h |
| October | 18.9°C9.7°C | 9.7°C | 55 | 5.2 | 11.311 h |
| November | 11.3°C2.6°C | 2.6°C | 47 | 7.3 | 10.210 h |
| December | 4.2°C-3.6°C | -3.6°C | 23 | 5.1 | 9.710 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
June in nearby cities
- Suwon in JuneSouth Korea · 16 kmHigh 25.9°C · Low 16.9°C · 118 mm rain
- Pyeongtaek in JuneSouth Korea · 18 kmHigh 27.1°C · Low 17.4°C · 118 mm rain
- Hwaseong-si in JuneSouth Korea · 23 kmHigh 23.3°C · Low 17.1°C · 127 mm rain
- Ansan-si in JuneSouth Korea · 29 kmHigh 24.8°C · Low 17.2°C · 127 mm rain
- Anyang-si in JuneSouth Korea · 30 kmHigh 25.0°C · Low 17.0°C · 126 mm rain
- Seongnam-si in JuneSouth Korea · 32 kmHigh 26.1°C · Low 16.9°C · 134 mm rain
- Gwangju, South Korea in JuneSouth Korea · 33 kmHigh 26.9°C · Low 17.3°C · 134 mm rain
- Icheon-si in JuneSouth Korea · 36 kmHigh 26.9°C · Low 17.0°C · 127 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 Osan) is explained once on the Osan year overview and on the Sources, method and limits page.
Suwon lies in the same rainfall cell, so its rainfall figures are identical to these; temperatures differ because they come from smaller 0.1° cells.