Osan Climate by Month
Osan, Gyeonggi-do, South Korea
Hot summers and cold winters, with most rain from May to September.
The climate in Osan is one of hot summers and cold winters, with most rain from May to September. August is the warmest month, with highs around 86°F (30°C); January is the coolest at 37°F (3°C), and nights dip to 17°F (-8°C). It gets 48 in (1209 mm) of rain a year, 76% of it from May to September.
- Warmest month
- 86°F(30°C)
- Average high, August
- Coldest nights
- 17°F(-8°C)
- Average low, January
- Rain per year
- 48 in(1209 mm)
- Wettest: July
- Humidity
- 68%
- Sunniest: May
Best and worst months in Osan
Best for weatherMay is the best time for weather in Osan: highs near 75°F (24°C) and about 3.3 in (84 mm) of rain a month.
Least pleasantJanuary is the least pleasant month: it's the coldest, with highs of only 37°F (3°C).
Comfort combines how close the afternoon high is to 75°F (24°C) with how much rain falls and how humid it is. See where the weather is best in May.
Temperature and rain through the year
Highs and lows (°F)
Average highAverage low
Rain (in per month)
Osan weather by month
| Month | High | Low | Rain | Humidity | Sun |
|---|---|---|---|---|---|
| JanJanuary | 37°F(3°C) | 17°F(-8°C) | 0.7 in(19 mm) | 60% | 2.3 |
| FebFebruary | 42°F(6°C) | 21°F(-6°C) | 1.0 in(26 mm) | 66% | 3.2 |
| MarMarch | 53°F(11°C) | 31°F(-1°C) | 1.6 in(41 mm) | 56% | 4.1 |
| AprApril | 65°F(18°C) | 42°F(6°C) | 3.1 in(79 mm) | 57% | 5.0 |
| MayMayBest | 75°F(24°C) | 54°F(12°C) | 3.3 in(84 mm) | 63% | 5.5 |
| JunJune | 82°F(28°C) | 64°F(18°C) | 4.8 in(121 mm) | 69% | 5.3 |
| JulJuly | 85°F(29°C) | 71°F(22°C) | 13 in(326 mm) | 80% | 4.3 |
| AugAugust | 86°F(30°C) | 72°F(22°C) | 10 in(260 mm) | 77% | 4.3 |
| SepSeptember | 79°F(26°C) | 60°F(16°C) | 5.2 in(132 mm) | 73% | 4.1 |
| OctOctober | 68°F(20°C) | 46°F(8°C) | 2.1 in(54 mm) | 69% | 3.6 |
| NovNovember | 54°F(12°C) | 34°F(1°C) | 1.8 in(45 mm) | 72% | 2.5 |
| DecDecember | 40°F(5°C) | 21°F(-6°C) | 0.9 in(22 mm) | 69% | 2.1 |
1991–2020 averages. Sun is solar radiation in kWh/m² per day. Highlighted: the most comfortable months.
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