Last updated: August 21, 2025
In September, Jiangnan, China, experiences a dynamic blend of weather characteristics, with maximum temperatures soaring up to 39°C (102°F) and an average of 27°C (80°F). The month showcases a comfortable early autumn transition, marked by minimum temperatures dipping to 16°C (62°F). However, it also brings moderate precipitation, totaling 90 mm (3.6 in) over approximately 11 days, contributing to humidity levels hovering around 72%. This combination of warmth and moisture creates a vibrant atmosphere, ideal for outdoor activities and scenic explorations in the region.
In September, Jiangnan, China begins to shift away from the sweltering summer as temperatures start to moderate. With a minimum temperature of 16°C (62°F), the early fall nights are pleasantly cool, while daytime averages rise to a comfortable 27°C (80°F). This month experiences a peak temperature of 39°C (102°F), a reminder of the lingering warmth, but overall, the trend indicates a gradual decline in heat. As the region transitions into autumn, the blend of warm days and cooler nights creates an inviting atmosphere, making September an ideal time to explore Jiangnan's vibrant culture and lush landscapes.
In September, Jiangnan experiences a notable transition in precipitation patterns, recording an average of 90 mm (3.6 in) over 11 days. This marks a decrease from the significantly wetter months of June and July, which saw over 230 mm each, as well as a dip from August's 136 mm. The arrival of autumn brings a gentler rhythm, with rainfall becoming less frequent, yet still vital for agriculture and water resources. The trend suggests a gradual shift from the peak summer rains to more moderate fall conditions, setting the stage for the drier months ahead. As these changes unfold, September serves as a bridge between the torrential summer rains and the cooler, crisper air of October.
In Jiangnan, China, September marks a notable shift in humidity levels as the summer's peak moisture begins to wane. After experiencing some of the highest humidity levels between July (91%) and August (87%), September sees a dip to 72%, signaling the transition towards drier autumn months. This decline brings a refreshing respite from the sticky heat, with humidity gradually increasing again in October to 74% before the seasonal fluctuations settle into the cooler months. The overall trend showcases a gradual climb through the spring and summer, peaking in mid-year, and a consistent cooling as the region prepares for fall, making September a month of transformation and relief.
As summer fades into September in Jiangnan, China, the UV Index remains notably high at 11, categorized as extreme. This slight dip from the intense UV levels of 12 in the preceding months still demands caution, with a burn time of just 10 minutes under direct sunlight. The trend observed from May through September indicates a continuous spike in UV exposure, urging residents and visitors alike to stay vigilant and protect their skin. Transitioning into October, a significant decrease in UV levels is anticipated, returning to 8, classified as very high. For more detailed insights on UV levels throughout the year, visit the Jiangnan UV Index.
UV Risk Categories
In Jiangnan, China, September offers a delightful transition from the sweltering summer months into the cooler embrace of autumn. With 237 hours of sunshine, it stands out as a vibrant month following the sunny peak of August, which boasts an impressive 309 hours. This gradual decline in sunshine hours is part of a broader trend, as the region enjoys a soaring peak in summer light, followed by a gentle tapering into fall. As the temperatures cool, the brilliant sunlight in September nurtures the landscape, illuminating the rich tapestry of autumn hues while bridging the warm vibrancy of summer with the crisp clarity of October, which still maintains a respectable 210 hours. Thus, September emerges as a golden month of transition, inviting both locals and travelers to bask in its radiant charm and enjoy the breathtaking beauty that Jiangnan offers amidst the changing seasons.
In Jiangnan, China, September stands out as a month of renewed brightness, with a 45% chance of sunny weather. This marks a significant uptick from the summer months, where the likelihood of sunshine dips to a mere 13% in July and 16% in June. As the autumn season approaches, sunseekers can expect an improvement compared to the gloomier late spring months, which see percentages as low as 21% in May. Interestingly, September's sun chances closely mirror those of November at 41%, indicating a trend towards clearer skies as the year transitions. Overall, September offers a refreshing reprieve from the wet and cloudy summer, making it an ideal time to enjoy the outdoors in Jiangnan.
As September arrives in Jiangnan, China, the daylight gradually begins to wane, dropping to 12 hours of light. This slight reduction marks a subtle transition from the long, sun-soaked days of summer, where daylight peaked at 13 hours from May through August. The month stands as a midpoint, bridging the lush abundance of late summer with the cooler, shorter days ahead. Following September, daylight further decreases, with October bringing 11 hours and the subsequent months reflecting even shorter daylight durations. This cyclical rhythm underscores the region’s seasonal shift, welcoming autumn while gently bidding farewell to the lingering warmth of summer.
September in Jiangnan, China, ushers in a gentle breeze, with an average wind speed of 1.7 m/s (4 mph), reminiscent of the tranquil late summer days. As the transition from the hot summer months takes shape, September's winds are slightly softer than the preceding July, which experienced a notable peak at 2.3 m/s (5 mph). This month delicately balances the remnants of summer's warmth while hinting at the cooler days to come, as October follows with a slight increase to 2.1 m/s. The overall trend reveals a dynamic yet consistent pattern of gentle winds, providing an inviting atmosphere that complements the picturesque scenery of Jiangnan during this transitional period.
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 strikingly contrasting weather conditions. In September, temperatures range from a minimum of 16°C (62°F) to a scorching maximum of 39°C (102°F), with an average of 27°C (80°F) and a relatively high humidity level of 72%. This month also sees about 90 mm (3.6 in) of precipitation spread over 11 days. In contrast, January experiences much cooler temperatures, with a minimum of -5°C (23°F), an average of 7°C (46°F), and a maximum of 25°C (78°F). This month is characterized by lower humidity at 65% and less precipitation, totaling 67 mm (2.7 in) over 8 days. For those looking for more details, you can check out Jiangnan weather in January.
September and February present stark contrasts in weather. In September, temperatures range from a minimum of 16°C (62°F) to a maximum of 39°C (102°F), making it a noticeably warmer month with an average temperature of 27°C (80°F). Humidity is relatively high at 72%, contributing to a feeling of mugginess, and the month sees about 90 mm (3.6 in) of precipitation over 11 days.
In contrast, February experiences much cooler conditions, with temperatures ranging from a minimum of -3°C (26°F) to a maximum of 27°C (81°F), resulting in an average temperature of just 9°C (48°F). While February has a slightly lower humidity level at 71%, it still brings about 75 mm (2.9 in) of precipitation over 10 days. For more details on February weather, you can explore Jiangnan weather in February.
September and March present contrasting weather experiences. In September, temperatures range from a comfortable minimum of 16°C (62°F) to a scorching maximum of 39°C (102°F), with an average of 27°C (80°F). However, humidity levels are relatively high at 72%, and the month sees 90 mm (3.6 in) of precipitation over 11 days. In stark contrast, March features cooler conditions, with temperatures dropping to a minimum of -1°C (31°F) and reaching a maximum of 31°C (89°F), averaging around 14°C (57°F). Despite the warmer maximum, March has more precipitation at 134 mm (5.3 in) over 15 days and slightly higher humidity at 81%. For a deeper understanding of seasonal trends, check out Jiangnan weather in March.
When comparing the weather in September and April, significant differences in temperature and humidity become apparent. September boasts higher average temperatures, with a minimum of 16°C (62°F) and a maximum reaching up to 39°C (102°F), making it a much warmer month overall than April, which has a milder minimum of 4°C (39°F) and a maximum of 34°C (93°F). Both months see a similar amount of precipitation, with September receiving 90 mm (3.6 in) over 11 days and April slightly more at 97 mm (3.8 in) over 12 days. Humidity levels are also higher in April, averaging 86%, compared to September's 72%. For more details on the climate during this time, you can refer to Jiangnan weather in April.
September and May present notably different weather patterns. September typically experiences warmer temperatures, with a minimum of 16°C (62°F) and an average of 27°C (80°F), reaching a maximum of 39°C (102°F). In contrast, May has cooler temperatures, starting from a minimum of 9°C (49°F) and averaging 23°C (74°F), peaking at 41°C (107°F). Precipitation also differs, with September recording 90 mm (3.6 in) over 11 days, while May sees a higher total of 189 mm (7.4 in) spread over 14 days. Additionally, humidity levels are higher in May at 87%, compared to September's 72%. For a more detailed look at the weather in May, visit Jiangnan weather in May.
In September, temperatures typically range from a minimum of 16°C (62°F) to a maximum of 39°C (102°F), with an average temperature of 27°C (80°F). The month experiences about 90 mm (3.6 in) of precipitation over approximately 11 days, along with a humidity level of 72%. In contrast, June is somewhat cooler, with temperatures ranging from 15°C (60°F) to 38°C (100°F) and an average of 25°C (78°F). However, it is significantly wetter, receiving 286 mm (11.3 in) of rainfall over 19 days, and maintaining higher humidity at 87%. For more detailed insights on June weather patterns, you can check out Jiangnan weather in June.
In comparing the weather between September and July, September typically exhibits a slightly milder temperature range with a minimum of 16°C (62°F) and an average of 27°C (80°F), in contrast to July's higher minimum of 21°C (70°F) and average of 29°C (85°F). July also reaches a maximum temperature of 41°C (106°F), exceeding September's peak of 39°C (102°F). However, July is characterized by significantly higher precipitation, totaling 233 mm (9.2 in) over 16 rainy days compared to September's 90 mm (3.6 in) and 11 rainy days. The humidity is notably higher in July at 91%, compared to September's 72%. For more insights, you can check Jiangnan weather in July.
In September, the weather begins to transition, with minimum temperatures of 16°C (62°F) and an average of 27°C (80°F), compared to warmer August temperatures that range from a minimum of 22°C (71°F) to an average of 30°C (87°F). While September still experiences high temperatures reaching up to 39°C (102°F), August holds the record with a peak of 41°C (106°F). Rainfall decreases in September to 90 mm (3.6 in) over 11 days, down from August's higher total of 136 mm (5.3 in) with the same number of rainy days. Additionally, September's humidity is slightly lower at 72%, as opposed to August's more humid 87%. For more detailed insights on August weather, you can check Jiangnan weather in August.
September typically experiences warmer temperatures, with a minimum of 16°C (62°F) and an average of 27°C (80°F), peaking at a high of 39°C (102°F). In contrast, October cools down significantly, featuring a minimum temperature of 9°C (49°F) and an average of 21°C (69°F), with a maximum reaching 37°C (98°F). While September sees about 90 mm (3.6 in) of precipitation over 11 days, October is drier, receiving approximately 59 mm (2.3 in) over just 7 days. Humidity levels remain relatively similar, with September at 72% and October slightly higher at 74%. For more detailed insights, you can explore Jiangnan weather in October.
September and November present strikingly different weather conditions. In September, temperatures range from a minimum of 16°C (62°F) to a scorching maximum of 39°C (102°F), with an average temperature of 27°C (80°F). The month is characterized by relatively high humidity at 72% and a total precipitation of 90 mm (3.6 in) over 11 days. In contrast, November sees much cooler temperatures, with a minimum of 3°C (38°F) and a maximum of 32°C (90°F), leading to an average of just 15°C (60°F). Precipitation decreases to 67 mm (2.6 in) over 9 days, and humidity rises slightly to 80%. For more details on the climate during this month, check out Jiangnan weather in November.
September weather is characterized by high temperatures, with a minimum of 16°C (62°F) and an average of 27°C (80°F), peaking at a scorching 39°C (102°F). The month also experiences considerable rainfall, with 90 mm (3.6 in) over 11 days and a humidity level of 72%. In contrast, December presents a much cooler climate, with temperatures ranging from a minimum of -2°C (29°F) to a maximum of 25°C (78°F) and an average of 9°C (49°F). Although there is less precipitation at 62 mm (2.5 in) over 9 days, humidity remains relatively high at 78%. For more details on December weather, you can visit Jiangnan weather in December.
As September arrives in Jiangnan, the weather begins to transition from the sweltering summer heat to a more moderate climate. The maximum temperatures trend downward, offering a reprieve from the intense heat often experienced in July and August, while average temperatures settle comfortably around a manageable level. However, it’s also a month that brings the potential for rain, with increased precipitation days compared to the earlier summer months, contributing to the region's lush greenery. With humidity levels remaining relatively high, the air carries that familiar warmth, but the overall atmosphere feels a bit cooler and refreshing as the season shifts. To learn more about the seasonal variations in Jiangnan's weather, check out Jiangnan Climate.