Last updated: October 30, 2025
April in Ulsan, South Korea, showcases a delightful transition into spring, characterized by mild temperatures and moderate humidity. The maximum temperature can reach a pleasant 26°C (80°F), while the average hovers around a comfortable 14°C (57°F). Cooler evenings bring temperatures down to a minimum of 2°C (35°F). Rainy days are not uncommon, with approximately 87 mm (3.4 in) of precipitation spread over 7 days, offering refreshing bursts of spring showers. Overall, April is a vibrant month in Ulsan, making it an inviting time to explore the city's blooming landscapes.
In April, Ulsan, South Korea, ushers in a vibrant transition from the chill of winter to the warmth of spring. With temperatures ranging from a minimum of 2°C (35°F) to a maximum of 26°C (80°F), the city experiences a significant rise in warmth, reflected in an average temperature of 14°C (57°F). This notable increase invites residents and visitors alike to embrace outdoor activities, as flowers bloom and nature comes alive. As the days grow longer and sunnier, April serves as a delightful prelude to the fiery summer months ahead, marking a time of refreshing change and anticipation.
April marks a significant transition in Ulsan, South Korea, as precipitation reaches 87 mm (3.4 in), matching March's levels. With rainfall spread over 7 days, the city experiences an increase in wet weather, contributing to the blooming spring landscape. This uptick is part of a broader trend where April's precipitation serves as a prelude to the heavier rains of summer, which often see totals soar past 200 mm in the following months. Interestingly, while January and February remain relatively dry, April's consistent rainfall plays a crucial role in nurturing the natural environment and enhancing the region's agricultural potential as the seasons shift.
In April, Ulsan experiences a notable increase in humidity, reaching 75%, which sets the stage for the more humid months ahead. This rise follows a gradual decrease from January's 72% down to March's low of 65%. As the region transitions into late spring, the humidity levels begin to creep upward, ultimately leading into the sweltering summer months of May and June, where humidity skyrockets to 83% and 87%, respectively. The pattern reflects a clear seasonal trend, where the air grows increasingly rich with moisture, laying the groundwork for the high humidity that characterizes the summer in this coastal city.
As April arrives in Ulsan, South Korea, residents experience a significant increase in UV exposure, with the UV Index soaring to 10—classified as very high. This marks a sharp rise from the preceding months, where the index hovered between moderate and high levels. With a burn time of just 15 minutes, it's crucial for outdoor enthusiasts to take precautions against sun damage. This trend continues into May, indicating that UV intensity remains a concern as the region transitions into summer. Understanding the UV Index is vital for safeguarding skin, and for more information, visit Ulsan UV Index.
UV Risk Categories
As April unfolds in Ulsan, South Korea, residents bask in the warmth of increasing daylight, enjoying a delightful 284 hours of sunshine. This marks a significant upward trend from the 272 hours in March, highlighting the transition into spring. The sun's gentle embrace becomes a precursor to even sunnier days ahead, with May leading the charge at an impressive 307 hours. This monthly climb not only paints a picture of longer, brighter days, but it also sets the stage for a joyful summer, as sunshine remains abundant through June and July. Overall, Ulsan’s progression into spring and summer reveals a vibrant shift toward warmth and light, enhancing the city’s charm and inviting outdoor activities.
In April, Ulsan experiences a 44% chance of sunny weather, a slight uptick from the preceding months, but still lower than the brighter days of January and February. This modest likelihood suggests that while the city begins to shake off the lingering chill of winter, the sun isn’t quite ready to dominate the sky just yet. As spring takes hold, April serves as a transitional month where the chances of sunshine are outpaced by the sunnier months that follow, such as the warm and clear days of late fall. Observing the broader trends, it's clear that Ulsan enjoys a more favorable climate in the later months, with the sun making a stronger presence from October onward, maximizing its potential for bright and cheerful days.
As April arrives in Ulsan, South Korea, residents can bask in 13 hours of daylight, a significant boost compared to the previous months. This increase marks a transition as the city shakes off the winter chill, with daylight gradually extending from 10 hours in January and February, to 11 hours in March, paving the way for the vibrant spring season. The climb continues into May, reaching 14 hours, as nature comes alive with longer days and blooming flora. This upward trend in daylight not only enhances outdoor activities but also uplifts the spirit, providing a delightful backdrop for the month’s many festivities and gatherings. As the days linger longer, Ulsan transforms into a sunlit haven, inviting everyone to embrace the joys of springtime.
In April, Ulsan experiences a gentle average wind speed of 3.3 m/s (7 mph), a continuation of the steady breezes seen in both February and March. This transitional month marks a shift from the stronger winds of winter, which average around 3.8 m/s in January and February. As spring unfolds, the winds soften, hinting at the impending warmth of summer. Interestingly, the wind speed trends further decrease into May and June, where it dips to 3.0 m/s and 2.6 m/s, emphasizing the tranquil charm of late spring. This gentle air movement in April creates the perfect backdrop for outdoor activities, inviting residents and visitors to embrace the beauty of Ulsan's blossoming scenery.
Weather in Ulsan varies notably across the year, with each month offering distinct climate conditions. This page compares April’s weather to other months in Ulsan, focusing on differences in temperature, rainfall, humidity, and UV levels.
April and January exhibit significantly different weather characteristics. In April, temperatures range from a chilly 2°C (35°F) at night to a comfortable 26°C (80°F) during the day, with an average of 14°C (57°F). This month sees about 87 mm (3.4 in) of precipitation over an average of 7 days, accompanied by a humidity level of 75%. In contrast, January offers much colder conditions, with minimum temperatures plummeting to -12°C (11°F) and a max of 16°C (62°F), averaging just 3°C (37°F). Additionally, January experiences far less precipitation, totaling only 32 mm (1.2 in) over about 3 days, coupled with a humidity level of 72%. For a deeper look into January conditions, you can refer to Ulsan weather in January.
April generally offers milder and more pleasant weather compared to February. With average temperatures ranging from a minimum of 2°C (35°F) to a maximum of 26°C (80°F), April experiences significantly warmer conditions, while February sees colder temperatures with a range from -9°C (15°F) to 23°C (73°F). Additionally, April has higher precipitation levels at 87 mm (3.4 in) over about 7 days, compared to February's 39 mm (1.5 in) spread over 4 days. The humidity also rises in April to 75%, compared to February's 67%, contributing to a more humid feel as spring approaches. For a detailed look at February weather in Ulsan, check out Ulsan weather in February.
April brings noticeably warmer temperatures compared to March, with averages rising from 9°C (49°F) in March to 14°C (57°F) in April. The maximum temperatures also increase, reaching up to 26°C (80°F) in April, in contrast to March's 22°C (73°F). Despite the slight decrease in the number of rainy days, April still sees considerable precipitation at 87 mm (3.4 in), just slightly higher than March's 86 mm (3.4 in). Humidity also rises in April to 75%, compared to 65% in March, creating a more humid atmosphere as the month progresses. For more details on March weather specifics, you can check Ulsan weather in March.
April and May present a noticeable shift in weather patterns. In April, temperatures range from a minimum of 2°C (35°F) to a maximum of 26°C (80°F), with an average of 14°C (57°F) and humidity at 75%. The month experiences significant rainfall, totaling 87 mm (3.4 in) over about 7 days. In contrast, May sees warmer temperatures with a minimum of 6°C (43°F) and a maximum of 33°C (92°F), averaging 19°C (66°F). Despite slightly lower precipitation at 80 mm (3.1 in) and 8 rainy days, humidity increases to 83%. For a detailed look at the weather trends, you can visit Ulsan weather in May.
April and June exhibit notable differences in weather patterns. In April, temperatures range from a chilly minimum of 2°C (35°F) to a comfortable maximum of 26°C (80°F), with an average of 14°C (57°F). The month experiences around 87 mm (3.4 in) of precipitation over approximately 7 days, accompanied by a humidity level of 75%. In contrast, June sees warmer weather, with temperatures varying from a minimum of 13°C (56°F) to a peak of 32°C (90°F) and an average of 22°C (72°F). It also brings increased rainfall, totaling 144 mm (5.7 in) over 10 days, and a higher humidity level of 87%. This transition to summer makes June distinctly warmer and more humid compared to the cooler and drier conditions of April. For more detailed information, you can check Ulsan weather in June.
April and July present stark contrasts in weather conditions. In April, temperatures range from a cool minimum of 2°C (35°F) to a pleasant average of 14°C (57°F), peaking at 26°C (80°F). Precipitation is moderate, with about 87 mm (3.4 in) falling over 7 days, and humidity levels sitting at a comfortable 75%. In contrast, July experiences significantly warmer temperatures, with a minimum of 17°C (63°F) and an average of 26°C (78°F), reaching a high of 36°C (98°F). However, this month also brings increased rainfall, with 244 mm (9.6 in) over 14 days and soaring humidity levels at 95%. For more detailed insights into the July climate, visit Ulsan weather in July.
April and August present contrasting weather patterns. In April, temperatures are generally mild, ranging from a minimum of 2°C (35°F) to a comfortable average of 14°C (57°F), peaking at 26°C (80°F). However, April experiences a fair amount of rainfall, with 87 mm (3.4 in) of precipitation over about seven days, accompanied by humidity levels around 75%.
In stark contrast, August is much warmer, with minimum temperatures starting at 19°C (66°F) and averaging 27°C (81°F), reaching highs of 36°C (98°F). The month is also significantly wetter, receiving 199 mm (7.8 in) of rainfall over approximately 15 days, and humidity increases to a sweltering 93%. For more specifics on the conditions during this month, visit Ulsan weather in August.
April and September present distinct weather patterns that characterize the transition between spring and fall. In April, temperatures range from a brisk minimum of 2°C (35°F) to a comfortable maximum of 26°C (80°F), with an average of 14°C (57°F). However, this month also sees considerable rainfall, accumulating around 87 mm (3.4 in) over approximately 7 days, and humidity levels hovering around 75%. In contrast, September brings milder temperatures, starting at a minimum of 13°C (56°F) and reaching up to 30°C (87°F), with an average temperature of 22°C (73°F). The month is significantly wetter, with precipitation totaling 236 mm (9.3 in) across 12 days, coupled with slightly higher humidity at 80%. For more details, check out Ulsan weather in September.
In comparing the weather between April and October, it's notable that both months experience mild temperatures, but with some differences. April sees minimums around 2°C (35°F) and an average of 14°C (57°F), while October’s minimums start a bit higher at 5°C (41°F) and have a warmer average of 17°C (63°F). Additionally, the maximum temperatures in October can reach up to 30°C (85°F), which is warmer than April’s maximum of 26°C (80°F). Precipitation is slightly higher in October at 100 mm (3.9 in) compared to April's 87 mm (3.4 in), although both months have rainfall on about 7 days. Humidity levels are also comparable, with April at 75% and October slightly higher at 77%. For more detailed October weather insights, you can visit Ulsan weather in October.
April and November showcase a noticeable contrast in weather conditions. April typically experiences milder temperatures, with a minimum of 2°C (35°F) and an average of 14°C (57°F), reaching up to a warmer maximum of 26°C (80°F). This month also sees more precipitation, averaging 87 mm (3.4 in) over about 7 days, highlighting a generally wetter atmosphere with 75% humidity. In contrast, November brings chillier temperatures, with lows dipping to -2°C (29°F) and an average around 11°C (52°F), peaking at 22°C (72°F). The rainfall in November is significantly less, totaling only 21 mm (0.8 in) over approximately 3 days, while the humidity remains consistent at 75%. For a detailed look into November weather in Ulsan, you can visit Ulsan weather in November.
April and December present contrasting weather patterns. In April, temperatures range from a cool 2°C (35°F) at night to a pleasant average of 14°C (57°F) during the day, peaking at a warm 26°C (80°F). This month sees higher rainfall, with about 87 mm (3.4 in) falling over about 7 days, accompanied by a humidity level of 75%. In contrast, December experiences colder conditions, with temperatures dipping to a minimum of -9°C (17°F) and averaging only 4°C (40°F), reaching a maximum of 18°C (64°F). Precipitation is significantly lower in December, totaling only 23 mm (0.9 in) over about 3 days, and the humidity remains relatively stable at 73%. For more specific details, you can check Ulsan weather in December.
As April unfolds in Ulsan, the dynamic shift in weather becomes evident, heralding a transition from the chill of winter towards the warmth of summer. With temperatures averaging a comfortable 14°C, this month marks a notable departure from the lower temperatures experienced earlier in the year. While light rain graces the region for about a week, humidity remains relatively steady at 75%, creating a refreshing atmosphere. This month serves as a gentle prelude to the balmy days ahead, providing a delightful blend of cool mornings and pleasantly warm afternoons. For a deeper understanding of how Ulsan's climate evolves, explore more at Ulsan Climate.