Osan Weather in May
What's the weather like in Osan (Gyeonggi Province) in May 2025?
The climate in Osan during May can be summarized as mild and a little damp.
May is in the spring in Osan and is typically the 5th warmest month of the year. Daytime maximum temperatures average around a comfortable 23°C (74°F), whilst at night 11°C (52°F) is normal.
| Daytime temperature | 23.1°C 73.6°F |
|---|---|
| Nightly temperature | 10.9°C 51.6°F |
| Average temperature | 17°C 62.6°F |
| Daily sunshine | 8.9 hrs |
| Avg rainfall | 86 mm 3.4 ins |
| Rainy days | 8 days |
| Sea temperature | 13°C 55.3°F |
| Humidity | 70% |
| Windspeed | 6.5kph 4 mph |
On average May is the 6th wettest month of the year in Osan with around 86mm 3.4 inches of rain making it a a little damp time to visit. This rainfall is typically spread over 8 days, although this may vary considerably.
On the flip side this corresponds to an average of 8.9 hours of sunshine per day.
May temperatures in Osan
May rainfall
May hourly sunshine
The data used in these monthly averages covers a period of over 100 years right up until last year. As such they are a valid prediction of what to expect for the weather in Osan in May 2025.
Other monthly averages
Osan weather stats
| Hottest month: | August | 29.6°C 85.3°F |
|---|---|---|
| Driest month: | December | 25mm 1ins |
| Sunniest month: | October | 7.5hrs |
| Coldest month: | January | 1.2°C 34.2°F |
| Wettest month: | July | 309mm 12.2ins |
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