Last updated: August 21, 2025
September in Jiangnan, China is characterized by a warm climate with maximum temperatures reaching up to 37°C (100°F) and an average of 24°C (75°F), providing a pleasant atmosphere for outdoor activities. However, the weather can be humid, with levels around 84%, making it feel warmer than it is. Rainfall is quite significant, totaling 179 mm (7.0 in) over approximately 16 days, contributing to the region's lush greenery. As summer transitions into fall, September offers a unique blend of warmth and moisture, creating a vibrant environment for both locals and visitors alike.
As summer gives way to autumn, September in Jiangnan, China showcases a delightful shift in temperatures. The month starts with a comforting minimum of 17°C (62°F) and peaks at a warm 37°C (100°F), yielding an average of 24°C (75°F). This temperature profile reflects a transition from the sweltering heat of August, where thermometers reached up to 40°C (104°F), to milder conditions that pave the way for the crispness of October. Humidity tends to linger, but September’s warmth is often tempered by gentle breezes, making it an ideal time for both locals and visitors to enjoy outdoor activities amid the stunning landscapes of Jiangnan. This month not only heralds a change in weather but also invites the vibrant colors of early autumn, enhancing the region's natural beauty.
In September, Jiangnan experiences a noteworthy shift in its precipitation patterns, receiving an average of 179 mm (7.0 in) over 16 days. This substantial rainfall marks a continuation of the wet season, following the peak months of May and July, which showcase even higher totals of 186 mm (7.3 in) and 184 mm (7.3 in) respectively. As summer transitions into autumn, September's precipitation reflects a slight decrease from August's 138 mm (5.4 in), yet it remains significant, highlighting the region's sustained humidity and the potential for lush landscapes. This trend of consistent rainfall signifies that while the monsoon season begins to wane, the water needs of the ecosystem continue to be met, setting the stage for a vibrant autumn in Jiangnan.
In Jiangnan, China, September marks a transition in humidity levels as the summer heat gradually gives way to the cooler autumn breezes. The month boasts a humidity of 84%, slightly dipping from the peak 87% of August but remaining high compared to other months. This pattern highlights a gradual decline from the intense humidity of July and August, which often envelops the region in a warm, sticky embrace. As September progresses, the humidity remains relatively stable yet begins to trend downward, paving the way for more comfortable conditions in October. This ebb and flow of moisture in the air paints a vivid picture of Jiangnan’s dynamic climate, where each month tells a story of how nature transitions from one season to the next.
In September, Jiangnan, China, experiences a notable shift in its UV Index, recording a value of 9, categorized as very high. This means that while the summer's extreme levels begin to recede—with July and August peaking at an index of 12—September still calls for caution with a recommended burn time of just 15 minutes. As daylight diminishes gradually, the sun remains potent enough to necessitate protective measures for skin health. The trends from January through September underscore a clear rise in UV exposure during the hotter months, peaking in the summer and starting to taper off as fall approaches. For more detailed insights, visit Jiangnan UV Index.
UV Risk Categories
In September, Jiangnan, China, basks in a delightful blend of warm sunshine and comfortable temperatures, enjoying 217 hours of bright daylight. This month stands out as a transition point, where the summer's peak sunshine—boasting a remarkable 313 hours in August—begins to soften. The steady decline in sunlight hours from the summer months is evident, yet September still benefits significantly from the sun's lingering presence. As the days shorten in October, with only 141 hours of sunshine forecast, the warmth of September serves as a gentle reminder of summer's glow, creating a perfect ambiance for outdoor festivities and explorations in this picturesque region.
September in Jiangnan, China, marks a notable shift in weather patterns, showcasing a 36% chance of sunny days. This increase in sunshine opportunities not only sets September apart from the preceding summer months, which hover around 25% and 31%, but also signifies a promising farewell to the torrid heat of the season. As autumn approaches, the likelihood of clear skies contrasts with the more overcast and humid conditions of earlier months, hinting at a delightful backdrop for outdoor activities. This upward trend continues into October, although the chances of sun dip significantly to 20%, making September a prime time for enjoying the beauty of Jiangnan under bright blue skies.
As September arrives in Jiangnan, China, the fleeting days of summer gradually give way to the crispness of autumn, reflected in the daylight duration of approximately 12 hours. This month marks a gentle decline from the long, sun-kissed days of June and July, which boast 14 and 13 hours of daylight, respectively. As the seasons transition, September's daylight serves as a reminder of the balance between light and shadow, sandwiched between the vibrancy of summer and the cozy embrace of fall. The rhythm continues into October, where daylight further diminishes to 11 hours, highlighting the inevitable shift toward shorter days. This gradual ebb and flow creates a seasonal tapestry, rich with the changing moods of nature.
As September arrives in Jiangnan, the gentle embrace of the wind begins to shift, reflecting a subtle yet noticeable change in the season. With an average wind speed of 1.9 m/s (4 mph), September stands out as a refreshing peak after a summer of calmer breezes, where speeds hovered around 1.3 to 1.6 m/s (3-4 mph) in the preceding months. This uptick in wind heralds the transition from the sultry summer to the more invigorating autumn, inviting locals and visitors alike to experience the delightful rustle of leaves and the crispness in the air. As the year rolls on, the winds will taper back to their earlier, softer rhythms, but for now, September's breezes offer a spirited reminder of nature’s ever-changing dance.
Weather in Jiangnan varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in Jiangnan, focusing on differences in temperature, rainfall, humidity, and UV levels.
September and January present stark contrasts in weather conditions. September boasts a warm climate with temperatures ranging from a minimum of 17°C (62°F) to a scorching maximum of 37°C (100°F), accompanied by high humidity levels at 84% and considerable rainfall of 179 mm (7.0 in) over 16 days. In contrast, January experiences much colder temperatures, with a minimum of -2°C (30°F) and an average of 8°C (47°F), peaking at 17°C (63°F). The precipitation in January is significantly lower at 30 mm (1.2 in) over just 8 days, and the humidity is relatively lower at 72%. For a more detailed look at the weather in January, you can check this link: Jiangnan weather in January.
September and February present contrasting weather patterns. In September, temperatures can soar with a minimum of 17°C (62°F) and a peak reaching up to 37°C (100°F), making it the warmer month with an average of 24°C (75°F). The humidity is quite high at 84%, accompanied by significant rainfall totaling 179 mm (7.0 in) over 16 days. In stark contrast, February brings much cooler conditions, with temperatures ranging from a minimum of 1°C (34°F) to a maximum of 25°C (78°F) and an average of 10°C (50°F). This month is markedly drier, with only 47 mm (1.9 in) of precipitation over 9 days, coupled with a lower humidity level of 76%. For more details on the February climate, you can check out Jiangnan weather in February.
September tends to be much warmer and wetter than March, with average temperatures ranging from a minimum of 17°C (62°F) to a scorching maximum of 37°C (100°F), while March offers milder temperatures, with lows around 6°C (42°F) and highs reaching up to 32°C (90°F). Precipitation in September is significantly higher, totaling 179 mm (7.0 in) over 16 days, compared to March's 101 mm (4.0 in) over 15 days. Additionally, the humidity in September peaks at 84%, creating a more humid environment, whereas March has slightly lower humidity at 80%. For more insights on March weather, you can refer to Jiangnan weather in March.
September experiences warmer temperatures compared to April, with average highs reaching 37°C (100°F), while April has a milder maximum temperature of 34°C (94°F). The minimum temperature in September is notably higher at 17°C (62°F), compared to April's 8°C (46°F). In terms of precipitation, September sees more rainfall, with 179 mm (7.0 in) spread over 16 days, whereas April receives 139 mm (5.5 in) over 14 days. Additionally, September's humidity at 84% makes it feel quite muggy, while April's humidity is slightly lower at 77%. For more details on April weather, visit Jiangnan weather in April.
In comparing the weather of September and May, it is evident that both months exhibit warm temperatures and significant precipitation. September typically experiences a wider temperature range, with nighttime lows around 17°C (62°F) and daytime highs reaching up to 37°C (100°F). In contrast, May features slightly cooler temperatures, with minimums around 12°C (54°F) and maximums peaking at 36°C (97°F).
Precipitation levels are somewhat similar, with September receiving approximately 179 mm (7.0 in) over 16 days, while May sees a bit more at 186 mm (7.3 in) across 19 days. Humidity remains high in both months, but September is marginally more humid at 84% compared to May's 82%. For a deeper look into the weather patterns of May, you can check out Jiangnan weather in May.
When comparing the weather in September and June, both months showcase a warmth that is characteristic of the region, but with some notable differences. September typically has a slightly higher maximum temperature, reaching up to 37°C (100°F), compared to June's peak of 36°C (96°F). However, the average temperatures are quite similar, with September averaging 24°C (75°F) and June at 25°C (77°F). In terms of precipitation, September receives more rainfall, totaling 179 mm (7.0 in) across 16 days, while June sees 151 mm (6.0 in) during the same number of days. The humidity levels are nearly identical, with September at 84% and June at 85%, making both months feel quite humid. For a closer look at June weather patterns, you can refer to this link: Jiangnan weather in June.
In comparing the weather patterns of September and July, we observe that September features slightly cooler temperatures, with an average of 24°C (75°F) compared to July's warmer average of 28°C (83°F). While both months experience similar levels of precipitation—179 mm (7.0 in) in September and 184 mm (7.3 in) in July—the frequency of rainy days remains constant at 16 days for both months. Additionally, humidity levels are quite comparable, with September at 84% and July just a notch higher at 85%. For more details on July weather, you can visit Jiangnan weather in July. Overall, September offers milder conditions while maintaining similar humidity and rainfall trends as July.
In comparing the weather of September to that of August, notable differences emerge. September experiences a more moderate temperature range with a minimum of 17°C (62°F), an average of 24°C (75°F), and a maximum reaching 37°C (100°F). In contrast, August tends to be hotter, with a minimum of 19°C (67°F), an average of 29°C (85°F), and a peak temperature of 40°C (104°F). Precipitation levels also increase in September, totaling 179 mm (7.0 in) over 16 days, compared to August's 138 mm (5.4 in) spread across 13 days. However, humidity remains high in both months, with September at 84% and August slightly higher at 87%. For more specific insights into August weather patterns, you can refer to Jiangnan weather in August.
September typically experiences warmer weather with average temperatures around 24°C (75°F), peaking at a high of 37°C (100°F). This month also sees significant precipitation, with 179 mm (7.0 in) recorded over 16 days and high humidity levels of 84%. In contrast, October marks a noticeable drop in temperature, with an average of 18°C (65°F) and maximums reaching 35°C (96°F). The precipitation decreases to 118 mm (4.6 in) over 15 days, accompanied by slightly lower humidity at 81%. For more detailed information, you can check Jiangnan weather in October.
In September, the weather typically features warm temperatures, with a minimum of 17°C (62°F) and an average of 24°C (75°F), occasionally reaching a scorching maximum of 37°C (100°F). The month is characterized by significant rainfall, accumulating 179 mm (7.0 in) over 16 days, combined with a high humidity level of 84%.
In contrast, November brings a notable drop in temperatures, where the minimum falls to 4°C (39°F) and the average settles at 13°C (56°F), with a maximum of 26°C (79°F). Rainfall is considerably lighter, totaling 60 mm (2.4 in) across 12 days, and humidity increases slightly to 86%. Overall, September is warm and humid, while November is cooler and less precipitation-heavy. For more detailed information about November's weather, you can visit Jiangnan weather in November.
September and December showcase stark contrasts in weather. In September, temperatures soar, with a minimum of 17°C (62°F), an average of 24°C (75°F), and a maximum reaching up to 37°C (100°F). This month is quite humid, with 84% humidity and significant rainfall, totaling 179 mm (7.0 in) across 16 days. In contrast, December brings a much cooler climate, with minimum temperatures dropping to 0°C (32°F) and an average of just 9°C (49°F). The maximum temperature in December peaks at 18°C (64°F), and precipitation is significantly reduced to 29 mm (1.1 in) over only 8 days, accompanied by slightly lower humidity at 81%. For more specific details, you can check Jiangnan weather in December.
As September rolls in, Jiangnan experiences a notable transition in weather, with a delightful blend of late summer warmth and early autumn coolness. Compared to the peak heat of earlier months, the temperatures begin to moderate, offering a comfortable average while still flirting with warmer highs. However, the increased humidity and regular rain showers, totaling 16 days, mark September distinctly, making it a month of lush greenery and vibrant landscapes. This combination of warmth and precipitation sets a unique tone, paving the way for a refreshing shift as the region heads into autumn. To dive deeper into the weather patterns of this area, check out the full details at Jiangnan Climate.