Last updated: August 21, 2025
In September, Jiangnan, China experiences a dynamic climate characterized by warm temperatures and notable humidity. The maximum temperature can reach a sweltering 36°C (97°F), while the average hovers around 26°C (80°F), ensuring that the warmth is a constant feature of the month. Nights offer some relief with temperatures dipping to a comfortable 19°C (66°F). However, this period also brings moderate rainfall, accumulating to approximately 94 mm (3.7 in) over 15 days, making it a month when showers are common, contributing to the 67% humidity level. This blend of heat and moisture creates a lush atmosphere, typical of Jiangnan's captivating early autumn.
In September, Jiangnan experience a delightful transition as temperatures begin to cool after the sweltering summer months. With minimums around 19°C (66°F) and averages reaching 26°C (80°F), the climate is both pleasant and inviting. The maximum temperature can soar to 36°C (97°F), hinting at the lingering warmth of summer, yet the overall trend is one of gradual cooling as the region edges toward autumn. This month captures a perfect balance, where sunny days and comfortable nights create an ideal setting for outdoor activities, reflecting the beauty and charm that Jiangnan has to offer during this time of year.
In September, Jiangnan experiences a notable shift in precipitation patterns, with an average rainfall of 94 mm (3.7 in) spread over 15 days. This marks a decline from the intense summer months of June and August, which recorded 302 mm (11.9 in) and 300 mm (11.8 in) respectively, showcasing a peak in the wet season. Despite this decrease, September still receives a robust amount of rain that reflects the lingering influence of the summer monsoons. In contrast, the following months, particularly October, show a further reduction to 69 mm (2.7 in), signaling the transition towards drier autumn conditions. This trend indicates that while rainfall in September remains significant, it acts as a bridge between the heavy rains of summer and the relative calm of autumn.
September in Jiangnan, China, marks a notable shift in humidity, as levels drop to 67% after a peak during the summer months. Following a summer dominated by high humidity, ranging from 84% to 88%, this decrease signals a transition into the drier and cooler autumn. As the lingering warmth of August gives way to a more comfortable September, the humidity begins to align closer to that of the spring months. This trend suggests a gradual easing of the muggy summer atmosphere, providing a refreshing reprieve for residents and visitors alike, as the region prepares for the climatic changes that October brings with 72% humidity.
As summer fades in Jiangnan, China, September sees a slight dip in the UV Index to 11, categorizing exposure as extreme and maintaining a burn time of just 10 minutes. This month reflects a gradual decline from the intense UV levels of August, which peaked at 13. The sustained high UV ratings from April through August emphasize a season of significant sun exposure, highlighting the importance of protective measures throughout the warm months. As September edges into autumn, it's critical for residents and travelers alike to remain vigilant about sun safety. For more detailed information, explore the UV Index trends in the region at Jiangnan UV Index.
UV Risk Categories
As the summer heat gently wanes, September in Jiangnan, China, offers a delightful transition marked by 279 hours of sunshine. This month, while seeing a decline from the dazzling 313 hours basked in July and 304 hours in August, still radiates warmth and is a perfect blend of summer's lingering glow and the upcoming autumn chill. Following a steady upward trend in daylight from January's modest 170 hours to a peak in midsummer, September showcases the gradual retreat of the sun but remains vibrant. As one of the last hurrahs of summer, the light-filled days invite both locals and travelers to relish the beautiful landscapes of Jiangnan, making it an enchanting time to explore the region's charm before the cooler months set in.
In Jiangnan, China, the likelihood of experiencing sunny weather in September sees a notable resurgence, with a 50% chance of sunshine that stands out amidst the generally lower probabilities throughout the year. This month marks a shift from the preceding summer, where sunny days dwindle to a mere 5% in June and 19% in August. As the autumn season approaches, September offers a refreshing balance, providing a delightful opportunity for outdoor activities and travel. Following this sunny reprieve, the trend continues to fluctuate into October, dipping again to 26%, and reflecting the atmospheric transition typical of the region. Overall, September emerges as a promising point in the year for sun-seekers in Jiangnan.
In Jiangnan, China, the shift in daylight duration throughout the year reveals a captivating trend. As the seasons transition from the cold grip of winter to the vibrant warmth of summer, daylight hours steadily increase, peaking at a generous 13 hours during the summer months of May through August. However, by September, this ample light begins to wane, offering 12 hours of daylight as autumn softly approaches. This gradual decrease continues into the later months, with daylight dropping to 10 hours by December, reminding us of the cyclical rhythm of nature and the impermanence of summer's brightness.
As summer transitions to autumn in Jiangnan, the September wind whispers a gentle breath, averaging a mild 2.4 m/s (5 mph). This slight decline in wind speed follows the summer's peak, where July recorded a brisk 3.1 m/s (7 mph). Interestingly, September's winds are reminiscent of the calm seen in May, hinting at a serene shift from the summer’s warmth. As the region prepares for October, with its anticipated increase to 4.1 m/s (9 mph), the soft September breeze provides a tranquil pause, painting a picture of serene mornings and balmy evenings that characterize this beautiful season.
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 contrasting weather conditions. In September, temperatures range from a minimum of 19°C (66°F) to a maximum of 36°C (97°F), with an average of 26°C (80°F). The month experiences relatively high humidity at 67% and substantial rainfall, totaling 94 mm (3.7 in) across 15 days. In stark contrast, January brings much cooler temperatures, with a minimum of 0°C (33°F), an average of 11°C (53°F), and a maximum of 25°C (78°F). This winter month sees less precipitation, at 52 mm (2.0 in) over just 7 days, accompanied by a slightly lower humidity level of 66%. For more detailed information about the weather in January, you can visit Jiangnan weather in January.
September and February showcase contrasting weather patterns. In September, temperatures soar with a minimum of 19°C (66°F) averaging around 26°C (80°F), and reaching a maximum of 36°C (97°F). This month also experiences considerable rainfall, with 94 mm (3.7 in) distributed over 15 days, accompanied by a humidity level of 67%. In stark contrast, February presents a much cooler climate, with temperatures dropping to a minimum of 1°C (34°F), an average of 11°C (52°F), and a maximum of 25°C (77°F). Precipitation is slightly lower at 88 mm (3.5 in) over just 10 days, and humidity rises to 71%. To learn more about the weather during this month, you can check out Jiangnan weather in February.
September weather features warmer temperatures, with a minimum of 19°C (66°F) and maximums reaching up to 36°C (97°F), making it a sultry month with an average of 26°C (80°F). In contrast, March presents a much cooler climate, where temperatures start at a minimum of 4°C (40°F) and can peak at 27°C (82°F), averaging 14°C (58°F). While September experiences 94 mm (3.7 in) of precipitation over 15 days, March is wetter, with 140 mm (5.5 in) of rainfall spread across 16 days, accompanied by slightly higher humidity at 81%. For more detailed insights into March weather specifically, check Jiangnan weather in March.
In September, the weather tends to be much warmer, with temperatures ranging from a minimum of 19°C (66°F) to a maximum of 36°C (97°F) and an average temperature of 26°C (80°F). The month experiences significant rainfall, totaling 94 mm (3.7 inches) over approximately 15 days, with humidity levels around 67%. In contrast, April features cooler temperatures, with a minimum of 8°C (47°F), an average of 18°C (65°F), and a maximum of 29°C (85°F). Although it sees slightly more precipitation, totaling 106 mm (4.2 inches) over about 12 days, the humidity is higher at 84%. For more details on this month's specific conditions, visit Jiangnan weather in April.
September and May present distinct weather patterns, highlighting the transition between summer and autumn. In September, temperatures range from a minimum of 19°C (66°F) to a maximum of 36°C (97°F), with an average of 26°C (80°F). The month sees about 94 mm (3.7 in) of precipitation over 15 days, along with a humidity level of 67%. In contrast, May experiences cooler temperatures, ranging from a minimum of 11°C (52°F) to a maximum of 34°C (93°F) and an average of 22°C (72°F). It also has higher rainfall, totaling 165 mm (6.5 in) over 16 days, and greater humidity at 87%. This makes May notably wetter and more humid compared to the warm, drier conditions of September. For more detailed insights on the weather in May, you can visit Jiangnan weather in May.
When comparing the weather in September and June, both months have similar average temperatures, hovering around 26°C (80°F). However, September experiences slightly higher maximum temperatures, reaching up to 36°C (97°F), while June peaks at 35°C (94°F). One notable difference is the precipitation: June sees significantly more rainfall, measuring 302 mm (11.9 in) over 20 days, compared to September's 94 mm (3.7 in) over 15 days. Additionally, humidity levels are higher in June at 84%, compared to September's 67%. For more detailed insights, you can check out Jiangnan weather in June.
In comparing the weather of September and July, both months experience similarly high maximum temperatures, peaking at 36°C (97°F). However, July tends to be warmer overall, with an average temperature of 28°C (83°F) compared to September's 26°C (80°F). Additionally, July is characterized by higher humidity levels at 88%, making it feel more oppressive compared to September's 67%. Precipitation is notably greater in July, totaling 127 mm (5.0 in) over 15 days, while September sees a lower rainfall of 94 mm (3.7 in) across the same number of days. For a deeper dive into July's weather specifics, check out this link: Jiangnan weather in July.
In comparing the weather between September and August, notable differences emerge in temperature and precipitation patterns. September generally experiences a wider range of temperatures, with minimums around 19°C (66°F) and maximums reaching up to 36°C (97°F), while August maintains higher minimum temperatures, starting at 24°C (75°F) and averaging a maximum of 35°C (96°F). Precipitation also varies significantly; September sees about 94 mm (3.7 in) of rain over 15 days, contrasting sharply with August's much higher 300 mm (11.8 in) over 22 days. Furthermore, the humidity level decreases from 85% in August to 67% in September, making September relatively more comfortable. For more detailed insights, you can check out Jiangnan weather in August.
September weather tends to be warmer, with average temperatures ranging from a minimum of 19°C (66°F) to a maximum of 36°C (97°F), along with higher precipitation at 94 mm (3.7 in) over 15 days. In contrast, October experiences cooler temperatures, with averages between 13°C (55°F) and a maximum of 33°C (92°F), and significantly less rainfall, totaling 69 mm (2.7 in) over just 10 days. Humidity also sees a slight increase in October, rising to 72% compared to September's 67%. For a more detailed overview, you can check Jiangnan weather in October.
September and November present markedly different weather patterns. In September, temperatures range from a minimum of 19°C (66°F) to a sweltering maximum of 36°C (97°F), with an average of 26°C (80°F). The month is characterized by high humidity at 67% and frequent rainfall, receiving 94 mm (3.7 in) over about 15 days. In contrast, November sees a cooler climate, with temperatures dipping to a minimum of 9°C (48°F) and reaching a maximum of 29°C (84°F), averaging 18°C (64°F). The month experiences less rain, totaling 75 mm (3.0 in) over just 9 days, accompanied by higher humidity at 77%. For more details, check out Jiangnan weather in November.
In September, the weather is considerably warmer, with average temperatures reaching 26°C (80°F) and maximums soaring up to 36°C (97°F). The month also sees a fair amount of rain, with 94 mm (3.7 in) of precipitation spread over 15 days, coupled with a humidity level of 67%. In contrast, December experiences much cooler temperatures, averaging just 13°C (56°F) and peaking at 25°C (78°F). Precipitation decreases significantly to 46 mm (1.8 in) across 9 days, and humidity rises slightly to 80%. For a detailed look at the weather specifics in December, you can visit Jiangnan weather in December.
As September unfolds in Jiangnan, the weather begins to transition, offering a unique blend of warmth and moisture. While summer’s heat lingers with average temperatures around 26°C (80°F), there’s a noticeable drop from the peak highs characteristic of July and August, making it more temperate and inviting. Humidity levels hover around 67%, providing a certain stickiness that hints at fall's arrival, despite the 15 days of rain that can alter outdoor plans. This month stands out as a time of change, welcoming the cooler nights and the subtle shift from the relentless summer sun. For an in-depth look at Jiangnan's climate throughout the year, visit Jiangnan Climate.