Last updated: October 30, 2025
April in Osan, South Korea, is a month of vibrant change as temperatures begin to rise. The maximum temperature reaches a pleasant 28°C (82°F), while the average settles around 12°C (54°F), creating a mild and inviting climate. However, early spring can still bring some chilly days, with a minimum dipping to -1°C (30°F). Rainfall is a factor to consider, with 54 mm (2.1 in) of precipitation spread over 5 days, contributing to the region's 75% humidity. This blend of warmth and occasional showers makes April an ideal time to experience the blossoming nature and cultural richness of Osan.
In April, Osan, South Korea, begins to shed its winter coat, heralding the arrival of spring with noticeably milder temperatures. With minimums hovering around -1°C (30°F) and reaching an average of 12°C (54°F), the city offers a refreshing climate ideal for outdoor activities. Daytime highs can soar to an impressive 28°C (82°F), creating a delightful contrast to the chill of preceding months. This significant temperature shift not only invigorates the landscape but also sets the stage for blossoming flora and a vibrant atmosphere as locals and visitors alike embrace the warm sun and the beauty of the season. As Osan transitions from winter’s grasp to the warmth of spring, it becomes a picturesque destination brimming with life and opportunity.
In April, Osan, South Korea, experiences a significant increase in precipitation, with 54 mm (2.1 in) of rainfall spread over 5 days. This uptick marks a transition into a wetter spring, following the gradual rise from 21 mm (0.8 in) in January and 23 mm (0.9 in) in February. The rainfall in April sets the stage for May's much heftier total of 98 mm (3.9 in), as the region prepares for the summer months ahead. Notably, with similar precipitation patterns seen in March and April, it becomes clear that as temperatures warm, so does the potential for more frequent rain events, ultimately fostering the lush greenery characteristic of this vibrant season.
As April arrives in Osan, South Korea, a notable uptick in humidity is observed, with levels soaring to 75%. This marks a shift from the milder, more stable conditions of March, which maintained a consistent 65% humidity. The trend continues upward through the spring months, culminating in even higher humidity readings as summer approaches, peaking at 91% during July and August. This gradual increase reflects the changing seasons, showcasing Osan's transition from crisp, dry winter months to the rich, humid atmosphere typical of summer. By comparing April's humidity to preceding months, it becomes clear that residents can expect a more humid environment as the year unfolds, setting the stage for the lush growth and vibrant landscapes that follow.
In April, Osan, South Korea experiences a notable increase in the UV Index, with levels reaching 8, categorizing it as very high. This marks a significant jump from the previous months, where the UV Index hovered between moderate and high levels. As the warmth of spring settles in, residents and visitors need to be especially cautious, with a burn time of only 15 minutes under direct sunlight. This trend towards increasing UV exposure highlights the importance of sun protection practices as we move into the sun-drenched months ahead. For more detailed information on UV trends throughout the year, check out Osan UV Index.
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As April dawns in Osan, South Korea, the city's residents revel in 289 hours of sunshine, marking a bright transition from the colder months. This increase from 283 hours in March indicates the promising arrival of spring, as warmer days invite outdoor adventures. The trend continues into May and June, where sunshine peaks at 315 and 318 hours respectively, creating a perfect backdrop for blooming flowers and vibrant festivals. Notably, while July and August see a slight dip, with 293 and 290 hours of sunlight, the overall trajectory from the winter months showcases a radiant journey towards summer. This seasonal shift not only enhances the mood of Osan's inhabitants but also emphasizes the region's growing warmth and vitality.
In Osan, South Korea, the likelihood of sunny weather in April hovers around 43%, reflecting a trend that shows the onset of spring offers some promise for sunshine, albeit on par with both March and May. After a winter with modest sun exposure and a noticeable dip in sunny days during the summer months, April stands out as a transitional period, setting the stage for brighter days ahead. While not the sunniest month, its consistency with previous weeks suggests that residents can still expect a number of clear days to enjoy the blossoming beauty of spring. The following months may see a drop in sunny days, making April a welcome relief for those chasing the sun after the winter chill.
As spring unfolds in Osan, South Korea, the daylight duration blossoms dramatically throughout April, reaching a delightful 13 hours of sunlight. This marks a significant increase from the 11 hours seen in March, heralding the lengthening days that accompany the warmer season. The trend of growing daylight continues into May, where it peaks at 14 hours, before gradually tapering off as summer approaches and the days start to shorten again. This seasonal shift not only enhances outdoor activities but also invigorates the local flora and fauna, making April a truly vibrant month in Osan. The increasing sunlight is a gentle reminder that summer is on the horizon, inviting residents and visitors alike to embrace the beauty of longer days.
As spring settles in Osan, South Korea, April's gentle average wind speed of 2.9 m/s (7 mph) graces the landscape, marking a slight increase from the preceding months. This month transitions from the lighter breezes of March, which recorded a lower 2.7 m/s (6 mph), maintaining a consistent flow that enhances the vibrant atmosphere of blooming flowers and clear skies. Following April, the winds remain steady through May but begin a gradual decline as summer approaches, with July witnessing the calmest breezes at just 2.0 m/s (4 mph). Overall, April stands out as a delightful interlude, where the wind supports a refreshing and invigorating experience in the heart of spring.
Weather in Osan varies notably across the year, with each month offering distinct climate conditions. This page compares April’s weather to other months in Osan, focusing on differences in temperature, rainfall, humidity, and UV levels.
April and January showcase stark contrasts in weather patterns. In April, temperatures range from a chilly minimum of -1°C (30°F) to a warm maximum of 28°C (82°F), with an average of 12°C (54°F). The month experiences moderate precipitation, totaling 54 mm (2.1 in) over about five days, alongside a humidity level of 75%. In contrast, January presents a much colder climate, with temperatures dipping to a minimum of -17°C (2°F) and averaging -2°C (29°F), reaching a maximum of only 13°C (55°F). January sees significantly less precipitation, measuring just 21 mm (0.8 in) over two days, and slightly lower humidity at 71%. For more specific details about January weather, visit Osan weather in January.
When comparing the weather in April to that of February, notable differences emerge in temperature and precipitation patterns. April experiences a significantly milder climate, with temperatures ranging from a minimum of -1°C (30°F) to a maximum of 28°C (82°F), resulting in an average of 12°C (54°F). In contrast, February is much colder, with temperatures dipping as low as -15°C (4°F) and peaking at 18°C (65°F), leading to an average temperature of just 0°C (33°F). Furthermore, April sees more precipitation, accumulating 54 mm (2.1 in) over about five days, while February has only 23 mm (0.9 in) of precipitation over four days. The humidity is also higher in April at 75% compared to February's 65%. For more detailed insights about February weather, you can check Osan weather in February.
The weather in April shows a noticeable warming trend compared to March, with average temperatures rising from 7°C (44°F) in March to 12°C (54°F) in April. The minimum temperatures in April are milder, at -1°C (30°F), compared to a colder -6°C (21°F) in March. Despite experiencing similar precipitation levels, with April receiving 54 mm (2.1 in) and March 47 mm (1.9 in), April tends to feel more humid at 75% compared to March's 65%. For a closer look at the conditions during March, you can refer to Osan weather in March.
April and May present a notable shift in weather conditions. In April, temperatures range from a chilly -1°C (30°F) at night to a warm 28°C (82°F) during the day, with an average of 12°C (54°F). The month sees about 54 mm (2.1 in) of rain over five days, and humidity is relatively moderate at 75%. In contrast, May offers a more temperate climate with minimum temperatures rising to 6°C (42°F) and maximums reaching 31°C (89°F), averaging 18°C (64°F). Rainfall increases to 98 mm (3.9 in) spread over eight days, accompanied by slightly higher humidity levels at 81%. This transition marks May as a month of warmth and increased precipitation, perfect for outdoor activities. For more specific details, visit Osan weather in May.
April and June display significant differences in weather patterns. In April, temperatures range from a chilly minimum of -1°C (30°F) to a pleasant maximum of 28°C (82°F), with an average temperature of 12°C (54°F). The month sees about 54 mm (2.1 in) of rainfall over 5 days, coupled with a humidity level of 75%. In contrast, June experiences warmer conditions, with temperatures ranging from a minimum of 12°C (53°F) to a high of 33°C (91°F) and an average of 22°C (72°F). June also has increased precipitation, totaling 80 mm (3.1 in) across 7 days, and higher humidity at 85%. For a detailed overview of June weather in Osan, visit Osan weather in June.
Comparing the weather in April and July reveals significant differences in temperature and precipitation. In April, temperatures range from a chilly minimum of -1°C (30°F) to a pleasant average of 12°C (54°F), with a maximum reaching 28°C (82°F). The month sees moderate precipitation, totaling 54 mm (2.1 in) over about 5 days, and humidity levels average around 75%. In contrast, July experiences much warmer conditions, with minimum temperatures starting at 18°C (65°F) and reaching an average of 26°C (79°F), peaking at a high of 36°C (98°F). This summer month is also notably wetter, with precipitation totaling 235 mm (9.3 in) spread over approximately 14 days and humidity levels rising to 91%. For more details, check out Osan weather in July.
April and August present contrasting weather patterns, highlighting the transition from spring to summer. In April, temperatures range from a chilly minimum of -1°C (30°F) to a comfortable maximum of 28°C (82°F), with an average temperature around 12°C (54°F). The month sees moderate precipitation of 54 mm (2.1 in) over approximately five days, accompanied by a humidity level of 75%. In stark contrast, August boasts much warmer temperatures, with a minimum of 16°C (61°F), an average of 27°C (80°F), and a scorching maximum that can reach up to 38°C (101°F). This month experiences significantly higher rainfall totaling 255 mm (10.1 in) across about 14 days and a humidity level of 91%, making it feel much more oppressive. For more information, you can visit Osan weather in August.
April and September present distinct weather patterns, each marking a transition between seasons. In April, temperatures range from a chilly minimum of -1°C (30°F) to a comfortable maximum of 28°C (82°F), with an average of 12°C (54°F). The month sees moderate precipitation, with about 54 mm (2.1 in) over five days and a humidity level of 75%. In contrast, September features a milder minimum temperature of 9°C (48°F) and a warmer average of 22°C (71°F), peaking at a maximum of 31°C (88°F). This month is wetter, with rainfall totaling 136 mm (5.4 in) spread over nine days and a slightly higher humidity of 77%. For more specifics on September weather, you can visit Osan weather in September.
April and October present a fascinating contrast in weather. In April, temperatures can range from a chilly minimum of -1°C (30°F) to a warm maximum of 28°C (82°F), with an average of 12°C (54°F). The month experiences around 54 mm (2.1 in) of precipitation over approximately five rainy days, accompanied by a humidity level of 75%. In comparison, October sees slightly milder conditions with temperatures ranging from 1°C (33°F) to a peak of 29°C (84°F) and an average of 15°C (59°F). The rainfall increases to 62 mm (2.5 in), also spread over five days, while humidity rises to 79%. For a detailed look at October weather specifically, you can refer to Osan weather in October.
April and November present distinct yet comparable weather patterns. In April, temperatures range from a chilly minimum of -1°C (30°F) to a pleasant maximum of 28°C (82°F), with an average of 12°C (54°F). Humidity is relatively moderate at 75%, and the month experiences about 54 mm (2.1 in) of precipitation over five days.
In contrast, November sees cooler temperatures, with a minimum of -5°C (23°F) and a maximum of 21°C (70°F), resulting in a lower average of 8°C (46°F). The humidity slightly increases to 80%, but the rainfall remains the same at 54 mm (2.1 in) over five days. For more details, check out Osan weather in November.
April and December present contrasting weather patterns, with April marked by milder temperatures and a more significant fluctuation. In April, temperatures range from a chilly minimum of -1°C (30°F) to a warm maximum of 28°C (82°F), with an average temperature of 12°C (54°F). The month also experiences a moderate amount of precipitation at 54 mm (2.1 in) over about five days, accompanied by a humidity level of 75%. In stark contrast, December is much colder, with temperatures plummeting to a minimum of -14°C (8°F) and an average of 0°C (33°F), peaking at just 13°C (56°F). The precipitation decreases to 26 mm (1.0 in) across the same number of days, and humidity remains slightly lower at 74%. For more details on December weather, you can visit Osan weather in December.
As April blossoms in Osan, the weather transforms into a delightful blend of warmth and moderate rainfall, setting it apart from the chillier winter months. With temperatures gradually rising, residents and visitors can enjoy milder days under a vibrant sky, making outdoor activities all the more inviting. The month experiences a noticeable increase in humidity, though the frequent, gentle showers provide essential moisture for the blooming landscape. This shift not only heralds the arrival of spring but also enhances the scenic beauty that Osan is known for. To learn more about what to expect throughout the year, visit Osan Climate.