Best Time to Visit Osan
Best time: May, Oct, Jun, Apr.
Aug is warmest (29.3°C high); Jul is rainiest (327 mm).
Osan weather by month
| Month | High °C | Low °C | Rain mm | Sun hrs |
|---|---|---|---|---|
| Jan | 1.9 | -8.4 | 26 | 3.7 |
| Feb | 4.4 | -6.1 | 30 | 5 |
| Mar | 10.1 | -0.9 | 49 | 6.5 |
| Apr | 17.6 | 5.5 | 89 | 8.1 |
| May | 22.6 | 11.6 | 94 | 8.9 |
| Jun | 26.4 | 17.1 | 132 | 8.4 |
| Jul | 28.7 | 21.4 | 327 | 7 |
| Aug | 29.3 | 21.4 | 276 | 7.2 |
| Sep | 25.2 | 15.1 | 151 | 6.6 |
| Oct | 19.3 | 7.4 | 53 | 5.7 |
| Nov | 11.4 | 0.8 | 52 | 4.1 |
| Dec | 4.6 | -5.4 | 26 | 3.4 |
Average high temperature
Best months by activity
Overall: MayOctJunApr
Beaches: Jun
Hiking: OctAprMayMar
Sightseeing: OctMayAprJun
Osan quick facts
What to pack
Cold months (Jan, Feb, Mar, Nov, Dec): warm layers and a coat.
Wet months (May, Jun, Jul, Aug, Sep): raincoat and umbrella.
Frequently asked questions
When is the best time to visit Osan?
May, Oct, Jun, Apr.
What is the rainiest month?
Jul, about 327 mm.
What is the warmest month?
Aug, with average highs of 29.3°C.
Where to stay
Book Osan hotels · Osan tours & activities
All destinations · Best time to visit Seoul · Best time to visit Yeoju · Best time to visit Yangsan · Best time to visit Yangju
Climate data: Open-Meteo Historical (ERA5), 1991–2020 climate normals.
Licensed under CC BY 4.0.
Open-Meteo.