Climate almanac
Osan
Gyeonggi-do, South Korea · 37.15°, 127.07°
What is the climate like in Osan?
The best time to visit Osan is typically April, the year's most comfortable month (5.8/10). Osan is warmest in August, when daily highs average 86°F (30°C), and coolest in January, when lows fall to about 21°F (-6°C). The wettest month is typically July and the driest is January; the year sees roughly 46 in (1159 mm) of precipitation.
- Best time to visitApril — the year's comfort peak (5.8/10)
- Warmest monthAugust — average high 86°F (30°C)
- Coolest monthJanuary — average low 21°F (-6°C)
- Wettest monthJuly (11 in (269 mm))
- Driest monthJanuary (0.9 in (22 mm))
- Annual precipitation46 in (1159 mm)
- Based on2016-2025 daily ERA5 reanalysis data (10-year normals)
- Records fromSeoul City, 47 km away (1973-2025)