Koesan Weather in May
What's the weather like in Koesan (North Chungcheong) in May 2026?
The climate in Koesan during May can be summarized as mild and a little damp.
May is in the spring in Koesan and is typically the 5th warmest month of the year. Daytime maximum temperatures average around a comfortable 23°C (73°F), whilst at night 10°C (49°F) is normal.
| Daytime temperature | 23°C 73.4°F |
|---|---|
| Nightly temperature | 9.6°C 49.3°F |
| Average temperature | 16.3°C 61.3°F |
| Daily sunshine | 9.1 hrs |
| Avg rainfall | 92 mm 3.6 ins |
| Rainy days | 9 days |
| Sea temperature | 13.6°C 56.5°F |
| Humidity | 66% |
| Windspeed | 6.1kph 4 mph |
On average May is the 5th wettest month of the year in Koesan with around 92mm 3.6 inches of rain making it a a little damp time to visit. This rainfall is typically spread over 9 days, although this may vary considerably.
On the flip side this corresponds to an average of 9.1 hours of sunshine per day.
May temperatures in Koesan
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 Koesan in May 2025.
Other monthly averages
Koesan weather stats
| Hottest month: | August | 29°C 84.2°F |
|---|---|---|
| Driest month: | December | 27mm 1.1ins |
| Sunniest month: | March | 7.7hrs |
| Coldest month: | January | 0.5°C 32.9°F |
| Wettest month: | July | 309mm 12.2ins |
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