Weather in Ulsan

Stay up to date with the latest weather conditions in Ulsan. In this section, you will find current data, detailed forecasts, and visual charts to help you plan your day.

The climate in Ulsan, located in South Korea, can be described as temperate, with four clearly defined seasons. Winters (December-February) are quite cold here, with average temperatures around 2-4°C and minimums dropping below freezing. Summers (June-August), on the other hand, are warm and humid, with average temperatures reaching 25-26°C and maximums around 28-29°C. Spring (March-May) and autumn (September-November) are pleasant transitional periods with gradual temperature changes.

One of the key features of the weather in Ulsan is the distribution of precipitation. The highest amount, as well as the maximum number of rainy days, occurs during the summer months, especially in July and August, when 7 mm of precipitation falls and there are 16-17 rainy days respectively. September also remains quite humid. This indicates a distinct wet season in summer. At the same time, the winter months (December, January) and late autumn (November) are characterised by minimal precipitation (1 mm) and the fewest number of rainy days, making them the driest periods of the year.

The climate in Ulsan is characterised by distinct seasons with noticeable temperature fluctuations throughout the year. The hottest month is traditionally August, when the average air temperature reaches 26.5°C. During this period, daytime highs often rise to 29.2°C, while nighttime lows stay comfortably around 23.8°C. Conversely, the coldest month is considered to be January with an average temperature of just 2.1°C. January nights can be frosty, with temperatures dropping to -1.9°C, while during the day the thermometer usually shows around 6.0°C.

The summer period in Ulsan, spanning June, July, and August, is distinguished by warm and at times sultry weather. June brings an average temperature of 21.9°C (from 18.2°C at night to 25.5°C during the day). By July, it becomes noticeably hotter: the average temperature is 25.7°C, with nighttime values around 23.0°C and daytime highs reaching 28.4°C. August, as previously mentioned, is the peak of summer. A characteristic feature of the summer months is the relatively small difference between day and night temperatures, contributing to a sensation of constant warmth, especially in July and August, where the difference is about 5-6°C.

Winter in Ulsan, lasting from December to February, brings coolness and sometimes light frosts. In December, the average temperature is 3.0°C, with night frosts down to -1.0°C and daytime temperatures around 6.9°C. January is the coldest, with averages of -1.9°C at night and 6.0°C during the day. February is slightly milder, with an average temperature of 4.3°C (ranging from 0.1°C to 8.4°C). During the winter months, daily temperature fluctuations are more pronounced than in summer and can be around 7-8°C, which means cool days and quite cold nights, sometimes with sub-zero temperatures.

In Ulsan, there is a marked seasonality in the distribution of precipitation throughout the year. A wet summer season is clearly traceable, falling on the months from June to September, and a drier period from late autumn to early spring.

The highest amount of precipitation falls during the summer months. July, August, and September are the wettest, when the average monthly precipitation reaches 7 mm. During this period, it rains quite often: for example, in August there are on average 17 days with precipitation, in July – 16, and in September – 14. June is also a relatively rainy month with 5 mm of precipitation and approximately 10 days when it is possible. Summer precipitation is generally more intense, which is characteristic of the region's monsoon climate.

The winter months, in contrast, are characterised by minimal precipitation. December, January, and November are the driest of the year, with only about 1 mm of precipitation falling per month. The number of days with precipitation during this period is also minimal: in December there are only about 3, in November – 4, and in January – 5. Considering that average minimum temperatures in December and January drop below freezing (to -1.0°C and -1.9°C respectively), this insignificant precipitation may fall not only as rain but also, possibly, as light snow or sleet.

The spring months (March, April, May) and October are transitional. In March, April, May, and October, about 3 mm of precipitation falls, with the number of rainy days ranging from 7 to 8. Thus, when planning a trip to Ulsan, one should expect the highest probability of rain in summer, while late autumn and winter will offer predominantly dry weather.

When planning a trip to Ulsan, it is important to consider seasonal weather changes so that your luggage is packed correctly. Summer (June-August) in Ulsan is warm, with an average temperature of 22-26.5°C, and is characterised by frequent rains, especially in July and August, when the number of rainy days reaches 16-17. Therefore, light, breathable clothing made from natural fabrics, sunscreen, a hat, and definitely a reliable umbrella or a light raincoat will be your best companions. September is also quite humid, so rain protection will be useful in early autumn as well.

Winter (December-February) in Ulsan is cool, with average temperatures from 2°C to 4°C and rare precipitation. At this time, you will need a warm jacket, sweaters, a hat, gloves, and a scarf. Spring (March-May) and autumn (October-November) are transitional seasons with moderate temperatures that gradually rise in spring and fall in autumn. For these periods, the principle of layering in clothing is ideal: T-shirts, long-sleeved shirts, light jackets, or cardigans that can be taken off or put on depending on the weather. Regardless of the season, comfortable walking shoes for exploring the city will be essential, as Ulsan offers many interesting places to explore on foot.