Best year time to visit Osan

General weather information about Osan

Average annual temperature is 14.9 °C

Absolute maximum temperature: 34.2 °C

Absolute minimum temperature: -11.1 °C

Number of sunny days: 166 days

Number of rainy days: 190 days

Number of snow days: 9 days

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* Weather data for Osan South Korea is based on climate observations for 2026 year

Osan air temperature forecast for each month

JanFebMarAprMayJunJulAugSepOctNovDec
Absolute maximum temperature (°C)15.513.524.625.428.031.531.434.230.523.625.518.7
Average daytime temperature (°C)6.49.016.618.622.427.228.630.727.421.113.78.3
Average temperature (°C)2.23.610.213.518.022.525.826.923.716.69.95.1
Average night temperature (°C)-1.7-0.35.79.314.219.123.523.820.712.86.11.8
Absolute minimum temperature (°C)-11.1-3.8-2.03.27.114.721.019.916.58.4-1.4-8.7

Osan monthly weather indicators

JanFebMarAprMayJunJulAugSepOctNovDec
Daylight maximum duration (h)10.011.012.013.014.014.014.013.012.011.010.010.0
Daylight mean duration (h)10.110.912.013.114.014.414.213.412.411.310.49.9
Daylight minimum duration (h)9.010.011.012.013.014.013.012.011.010.010.09.0
Sunshine mean duration (h)7.17.28.57.57.18.35.610.18.18.57.05.4
Precipitation (mm)323537105179186431205139238465
Sunny days172023121313268191914
Rainy days1088181817292522121112
Snow days400000000005

Osan - weather forecast by months

Osan weather in januaryOsan weather in februaryOsan weather in marchOsan weather in aprilOsan weather in mayOsan weather in juneOsan weather in julyOsan weather in augustOsan weather in septemberOsan weather in octoberOsan weather in novemberOsan weather in december

Best time to visit Osan:

The best time to visit Osan during the most sunny months:

  • August — 10.1(h)

The largest precipitation sum in Osan is at

  • May — 179(mm)
  • June — 186(mm)
  • July — 431(mm)
  • August — 205(mm)

    • Weather forecast in the closest to Osan admin centers

    Weather forecast in the closest towns to Osan

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    Frequently asked questions

    When is the best time to visit Osan?
    The historical weather data above shows the warmest, sunniest and driest months to help you choose the best time to visit Osan.
    What is the weather like in Osan?
    See average temperature, rainfall and daylight hours for Osan by month in the table above.
    How many sunny days does Osan have?
    The monthly weather statistics above show sunshine and rainfall patterns for Osan throughout the year.