Busan weather in May
In May, Busan has an average high of 21 °C70 °F and an average low of 14 °C56 °F, with about 144 mm5.7 in of precipitation. It is the 5th warmest month of the year and ranks 5th for precipitation.
How May compares with other months
Compared with April, May is 4.5 °C8 °F warmer on average and wetter by 7 mm0.3 in. Compared with June, May is 3.7 °C6.7 °F cooler on average and drier by 31 mm1.2 in. Daylight lasts about 14.0 hours around the middle of the month. Average relative humidity is 79% and the average cloud amount 62%.
Is May a good time to visit Busan?
May is not among the most comfortable months by our comfort score: it is fairly wet (144 mm5.7 in). The most comfortable months in Busan are October.
What to wear in May
For Busan in May, pack light layers — T-shirts plus a light sweater or jacket and an umbrella or light rain jacket.
May in nearby places
Other months in Busan
- January6 °C43 °F / −1 °C31 °F
- February8 °C47 °F / 1 °C34 °F
- March12 °C54 °F / 4 °C40 °F
- April17 °C62 °F / 9 °C48 °F
- May21 °C70 °F / 14 °C56 °F
- June24 °C75 °F / 18 °C64 °F
- July27 °C80 °F / 22 °C72 °F
- August28 °C83 °F / 24 °C75 °F
- September25 °C77 °F / 20 °C68 °F
- October21 °C69 °F / 14 °C57 °F
- November15 °C58 °F / 7 °C45 °F
- December8 °C46 °F / 1 °C34 °F
Frequently asked questions
How warm is Busan in May?
In May the average high in Busan is 21 °C (70 °F) and the average low is 14 °C (56 °F).
Does it rain a lot in Busan in May?
On average about 144 mm (5.7 in) of precipitation falls in May; it ranks 5th of the 12 months.
Is May the warmest month in Busan?
No. The warmest month in Busan is August, with an average high of 28 °C (83 °F). The coldest month is January, with an average low of -1 °C (31 °F).
How long is the day in Busan in May?
In the middle of May the day in Busan lasts about 14.0 hours from sunrise to sunset. The value is calculated from the position of the city and the sun.
How humid is Busan in May?
The average relative humidity in May is about 79%. This is a long-term average for the whole day.
How cloudy is Busan in May?
On average about 62% of the sky is covered by cloud in May. This is the mean cloud amount from satellite data, not the number of sunny days.
About this data
All figures are 25-year averages (January 2001 – December 2025) from the NASA POWER project. Temperature, humidity, wind and precipitation come from the MERRA-2 reanalysis (precipitation is the bias-corrected MERRA-2 product), cloud and solar values from CERES satellite data. They describe a grid cell of roughly 50–70 km, not a single weather station, so they can differ from airport records — most of all on coasts, in mountains and for rainfall. Average highs and lows are the monthly mean temperature plus/minus half of the average daily temperature range. Counts of rainy days are not part of this dataset.
The grid cell’s average elevation is 70 m, while Busan lies at about 15 m. Temperatures on this page were therefore adjusted by +0.4 °C0.6 °F using the standard lapse rate of 6.5 °C per 1,000 m.