Osan Climate: Weather by Month and Best Time to Visit
Best months for Osan: May, October, June, September.
Year at a glance
Weather by month
| Month | Avg high | Avg low | Rainfall | Rainy days | Humidity | Sunshine | Score |
|---|---|---|---|---|---|---|---|
| January | 2°C | -6°C | 20 mm | 4 | – | – | 4.9 |
| February | 5°C | -4°C | 27 mm | 4 | – | – | 5.4 |
| March | 11°C | 1°C | 38 mm | 6 | – | – | 6.4 |
| April | 17°C | 7°C | 69 mm | 7 | – | – | 7.4 |
| May | 23°C | 12°C | 88 mm | 7 | – | – | 8.1 |
| June | 27°C | 18°C | 126 mm | 8 | – | – | 7.9 |
| July | 28°C | 22°C | 277 mm | 15 | – | – | 6.2 |
| August | 29°C | 22°C | 227 mm | 15 | – | – | 6.3 |
| September | 26°C | 17°C | 124 mm | 8 | – | – | 7.8 |
| October | 20°C | 10°C | 54 mm | 5 | – | – | 8.0 |
| November | 12°C | 3°C | 46 mm | 7 | – | – | 6.5 |
| December | 4°C | -4°C | 23 mm | 5 | – | – | 5.2 |