Last updated: October 30, 2025
In Hwaseong-si, South Korea, September brings a delightful mix of warm temperatures and refreshing moisture. The maximum temperature often reaches around 29°C (84°F), while the average hovers at a comfortable 22°C (72°F). Nights can cool down to a pleasant 15°C (59°F). This month is also characterized by significant precipitation, totaling 141 mm (5.6 in) over 9 rainy days, resulting in a humidity level of 77% that adds a touch of softness to the air. These climatic conditions create a vibrant atmosphere, making September an ideal time for outdoor activities amidst the lush scenery.
As summer fades and autumn approaches, September in Hwaseong-si, South Korea, offers a delightful transition in temperatures. The month typically sees minimums around 15°C (59°F), providing a pleasantly mild start, while the average temperature hovers at 22°C (72°F), making it an ideal time for outdoor activities. With maximum temperatures reaching up to 29°C (84°F), the days remain warm, allowing residents and visitors alike to enjoy the last vestiges of summer. This month stands out as a period of comfort, striking a perfect balance between warmth and cool breezes, hinting at the cooler days that October will bring. As nature shifts towards vibrant autumn foliage, September is a picturesque time to explore the beauty of Hwaseong-si.
In September, Hwaseong-si experiences a significant shift in precipitation, with an average of 141 mm (5.6 in) of rain falling over 9 days. This marks a notable decrease from the two preceding months, which saw heavy rains—261 mm in August and 239 mm in July, suggesting that the peak of the rainy season is winding down. However, September's rainfall remains substantial, contributing to a lush landscape as the region transitions into autumn. The consistent rain during this month is vital for maintaining soil moisture and supporting local agriculture, positioning September as a critical period of balance between the remnants of summer storms and the forthcoming drier months ahead.
As summer's heat begins to wane, September in Hwaseong-si welcomes a noticeable shift in humidity, with levels dropping to 77%. This reduction marks a retreat from the intense moisture that dominates the preceding months, particularly July and August, which both peak at a high 91%. While September's humidity remains elevated compared to the earlier months of the year, such as January at 71% and February at 65%, it signals the onset of a more comfortable autumn climate. Following this trend, as the year progresses into October, humidity levels slightly rise again to 79%, hinting at the persistent moisture characteristic of South Korea’s varied seasons.
In September, Hwaseong-si experiences a notable UV Index of 9, categorizing it as very high exposure. During this month, residents and visitors should be particularly cautious, as the burn time is reduced to just 15 minutes under direct sunlight. This trend follows the peak summer months of July and August, where the index reached an extreme level of 11. Fortunately, September's UV levels drop slightly, yet they remain significantly elevated compared to earlier months in the year. As autumn approaches, it’s crucial to stay informed about sun safety practices to minimize skin damage, especially as we transition toward lower indices in October. For detailed information on UV levels throughout the year, check out the Hwaseong-si UV Index.
UV Risk Categories
In September, Hwaseong-si basks in a warm embrace of 261 hours of sunshine, a charming farewell to the summer months. While this is a notable decrease from the sun-drenched heights of May and June, which boast 315 and 318 hours respectively, it still offers a vibrant glow compared to the waning days of autumn that follow. The gradual decline in sunlight as the year progresses is evident, with October slightly brighter at 266 hours and November bringing notably fewer rays at 231 hours. This transition signifies an alluring balance, where the lingering warmth of September mingles with the anticipation of the cooler months ahead, inviting both locals and visitors to savor the last bits of summer.
In Hwaseong-si, South Korea, the likelihood of sunny weather in September stands at 41%, reflecting a slight recovery from the summer months when sunshine chances dip to 33% in July and 34% in August. This positions September favorably among the preceding months, although it remains lower than the sunnier spells of late spring. As the region transitions into autumn, sunny days become more likely, with October showing an upward trend at 47%. Overall, while September offers a modest chance for sunshine, it hints at the brighter days that follow in the fall season.
In Hwaseong-si, South Korea, the daylight duration showcases a dynamic shift throughout the year, peaking in the summery months. September, with its 12 hours of daylight, marks a gentle transition as the days start to shorten from the summer's abundance of 14 hours in June, July, and early August. This gradual decrease highlights the winding down of long, bright days, as October approaches with a further reduction to 11 hours. Interestingly, the increase in daylight hours from 9 hours in January to a summer high emphasizes the vibrant energy that comes with the warmer months, making September a time of delightful balance—still bright enough to enjoy the lingering warmth, yet hinting at the cozy autumn days ahead.
In Hwaseong-si, South Korea, September signals a subtle shift in the winds, with an average speed of 3.9 m/s (9 mph). This moderate breeze offers a refreshing change, especially when compared to the summer months of July and August, which saw slower winds at 2.7 m/s and 3.2 m/s, respectively. As the year progresses, the wind speeds begin to gradually increase again, hinting at the approach of autumn. This trend is reflected in the following months, where averages rise to 4.1 m/s in November and 4.6 m/s in December. September’s winds, therefore, not only rejuvenate the atmosphere but also mark the beginning of a seasonal transition characterized by growing movement in the air.
Weather in Hwaseong-si varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in Hwaseong-si, focusing on differences in temperature, rainfall, humidity, and UV levels.
September and January showcase contrasting weather patterns in Hwaseong-si. In September, temperatures range from a mild 15°C (59°F) to a warm 29°C (84°F), with an average of 22°C (72°F). This month also experiences significant rainfall, totaling 141 mm (5.6 in) over approximately 9 days, accompanied by high humidity levels averaging 77%. In stark contrast, January brings frigid temperatures, with a minimum of -14°C (7°F) and an average of 0°C (32°F), peaking at just 10°C (50°F). Precipitation takes a drastic dip to 24 mm (0.9 in) over only 3 days, and humidity remains relatively low at 71%. For more insights into Hwaseong-si’s winter conditions, visit Hwaseong-si weather in January.
September and February present stark contrasts in weather conditions. In September, temperatures range from a minimum of 15°C (59°F) to a maximum of 29°C (84°F), with an average of 22°C (72°F) and high humidity at 77%. This month also sees significant rainfall, with 141 mm (5.6 in) over nine days. In contrast, February experiences much colder weather, with temperatures dipping as low as -10°C (14°F) and averaging just 1°C (33°F), peaking at 11°C (52°F). It is considerably drier, with only 27 mm (1.0 in) of precipitation across four days and a humidity level of 65%. For more detailed insights into February weather, you can refer to Hwaseong-si weather in February.
September and March present contrasting weather patterns. September boasts warmer temperatures, with averages around 22°C (72°F) and highs reaching 29°C (84°F), while March remains chilly, featuring a frigid average of 6°C (43°F) and maximums only reaching 15°C (60°F). Additionally, September is characterized by significantly higher precipitation, averaging 141 mm (5.6 in) over about 9 days, compared to March's more moderate 55 mm (2.2 in) over just 5 days. Humidity levels also differ notably, with September hovering at a humid 77%, while March offers a drier experience at 65%. For more specific weather details, you can visit Hwaseong-si weather in March.
September generally offers warmer conditions compared to April, with average temperatures ranging from a minimum of 15°C (59°F) to a maximum of 29°C (84°F). In contrast, April's temperatures are noticeably cooler, starting at a minimum of 3°C (37°F) and peaking at 22°C (71°F). Additionally, September sees higher precipitation levels, averaging 141 mm (5.6 in) over about 9 days, while April experiences less rainfall, totaling 65 mm (2.6 in) over 6 days. Both months maintain similar humidity levels, with September slightly more humid at 77% compared to April's 75%. For more details on April weather specifically, you can check Hwaseong-si weather in April.
In comparing the weather of September and May, September tends to be warmer, with average temperatures ranging from a minimum of 15°C (59°F) to a maximum of 29°C (84°F), while May has cooler temperatures, with a minimum of 8°C (46°F) and a maximum of 23°C (73°F). Interestingly, both months experience about the same amount of rainfall, with September receiving slightly more at 141 mm (5.6 in) compared to May's 113 mm (4.4 in), and both months typically see precipitation on approximately 9 days. Humidity levels in September average around 77%, slightly lower than May's 81%, suggesting that while September is warmer, May can feel more humid and cool. For more detailed information, you can check Hwaseong-si weather in May.
In comparing the weather between September and June, we notice that September tends to be warmer overall, with average temperatures reaching 22°C (72°F) compared to June's average of 20°C (68°F). September also boasts a higher maximum temperature of 29°C (84°F) against June's peak of 26°C (79°F). However, September experiences more rainfall, with 141 mm (5.6 in) over about 9 days, whereas June sees less precipitation at 83 mm (3.3 in) spread over 7 days. Humidity levels are slightly lower in September at 77%, compared to 85% in June, making September feel a bit drier. For more details on June weather, you can check Hwaseong-si weather in June.
In comparing the weather patterns of September and July, one can observe notable differences in temperature and precipitation. September experiences milder temperatures, with a minimum of 15°C (59°F), an average of 22°C (72°F), and a maximum of 29°C (84°F). In contrast, July is warmer overall, featuring a minimum of 19°C (67°F), an average of 24°C (76°F), and reaching up to 31°C (89°F).
Precipitation also varies significantly; September sees 141 mm (5.6 in) of rainfall across 9 days, while July is notably wetter with 239 mm (9.4 in) over 12 days, contributing to a higher humidity level of 91% compared to September's 77%. For more detailed insights into July's weather, you can visit Hwaseong-si weather in July.
In comparing the weather between August and September, we see notable differences in temperature and precipitation. August typically experiences warmer conditions, with minimum temperatures around 19°C (67°F) and maximums reaching up to 32°C (90°F), resulting in an average of 26°C (79°F). In contrast, September cools down, featuring average temperatures of 22°C (72°F), with minimums of 15°C (59°F) and maximums peaking at 29°C (84°F).
Precipitation also varies significantly; August has a higher total of 261 mm (10.3 in) over 13 days, while September sees a decrease to 141 mm (5.6 in) over just 9 days. Additionally, humidity is higher in August at 91%, compared to September's 77%. For more details on August's weather patterns, visit Hwaseong-si weather in August.
September experiences warmer temperatures compared to October, with a minimum of 15°C (59°F) and an average high of 29°C (84°F), while October sees a drop to a minimum of 5°C (40°F) and a maximum of 26°C (79°F). Additionally, September is notably wetter, receiving 141 mm (5.6 in) of precipitation over 9 days, whereas October has only 65 mm (2.6 in) of rainfall across 6 days. Despite the cooler temperatures in October, the humidity levels remain relatively high at 79%, slightly above September's 77%. For more details, you can visit Hwaseong-si weather in October.
September and November showcase a distinct contrast in weather. In September, temperatures range from a minimum of 15°C (59°F) to a maximum of 29°C (84°F), with an average of 22°C (72°F). This month also experiences significant rainfall, totaling 141 mm (5.6 in) over 9 days, contributing to a relatively high humidity level of 77%. In stark contrast, November sees temperatures drop significantly, with a minimum of -2°C (29°F) and an average of 9°C (49°F), peaking at 19°C (66°F). Precipitation is lower at 66 mm (2.6 in) over just 7 days, and humidity rises slightly to 80%. For more information on November weather, visit Hwaseong-si weather in November.
September and December showcase stark contrasts in weather conditions. In September, temperatures range from a mild 15°C (59°F) at night to a warm 29°C (84°F) during the day, accompanied by higher humidity levels at 77% and significant rainfall totaling 141 mm over nine days. In contrast, December brings a chilly climate with temperatures dropping to a frigid minimum of -11°C (13°F) and an average of just 2°C (36°F), along with a maximum of 13°C (56°F). Precipitation is notably lower at 31 mm over six days, and humidity slightly decreases to 74%. For more details, you can check Hwaseong-si weather in December.
As September rolls in, Hwaseong-si experiences a notable transition in weather that sets it apart from the sweltering summer months. With milder temperatures and increased humidity, the air feels heavier, making outdoor activities a more refreshing experience, despite the days of rainfall. This month often brings a blend of warm days and cooler nights, providing a pleasant contrast to the heat of August. While September may not be as dry as the preceding months, the occasional downpours contribute to the region's lush greenery. For a more detailed understanding of how September weather fits into the overall climate profile of Hwaseong-si, visit Hwaseong-si Climate.