Last updated: August 21, 2025
In September, Changshu, China, experiences a dynamic shift in weather as the summer heat begins to wane. With maximum temperatures soaring up to 35°C (95°F) and an average of 25°C (77°F), the warmth remains prevalent, while the cool nighttime lows drop to 15°C (59°F). This month records approximately 134 mm (5.3 in) of rainfall over 12 days, contributing to an overall humidity level of 81%. Visitors can expect a mix of sunny days and occasional showers, making it an ideal time to explore the lush landscapes of this vibrant region.
In September, Changshu transitions into a mild autumn, with temperatures offering a pleasant reprieve from the summer heat. The average temperature settles at 25°C (77°F), while the minimum temperature comfortably rests at 15°C (59°F), providing a welcome change from the sweltering summer days. As the month progresses, highs can still reach up to 35°C (95°F), hinting at the lingering warmth of summer. This gentle drop in temperature marks a shift in the seasons, as daytime feels more temperate and evenings grow cooler, creating the perfect backdrop for outdoor activities and colorful autumn festivities.
September in Changshu, China, sees a significant precipitation of 134 mm (5.3 in), marking a continuation of the late summer rains. With about 12 rainy days, the month retains a lively rhythm of moisture, bridging the wettest summer months and the drier autumn ahead. The trend is clear: following the peak in July at 256 mm (10.1 in) and a substantial 154 mm (6.1 in) in August, September's rainfall showcases a notable decrease, yet remains considerably high relative to the upcoming months. This gradual decline signals a transition, as the vibrant buzz of the summer storm season begins to give way to the more tranquil and temperate conditions of October and beyond.
In September, Changshu experiences a notable shift in humidity, with levels dropping to 81% after the sweltering peaks of summer. This decline marks a transition from the highs of July and August, where humidity levels reached a steamy 93% and 91% respectively. As the autumn approaches, the air begins to feel a bit crisper, providing a welcome relief from the oppressive humidity that characterizes the earlier months. This trend of gradually decreasing humidity continues into October, where it settles at 80%, hinting at the seasonal changes to come. Overall, September serves as a bridge between the sticky summer and the cooler fall, showcasing Changshu's dynamic climate.
As September arrives in Changshu, China, the UV Index maintains a notable 10, categorizing exposure as very high with a burn time of just 15 minutes. This marks a slight decline from the extreme levels observed in the summer months, where indices reached up to 11 in June, July, and August. However, the weather remains bright, and caution is still necessary; skin can burn quickly under the September sun. The gradual easing of UV intensity signals the approaching autumn, yet outdoor enthusiasts should remain mindful of UV exposure. For more information on the UV Index throughout the year, visit Changshu UV Index.
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As September unfolds in Changshu, China, residents bask in 258 hours of glorious sunshine, wrapping up a summer filled with radiant blue skies. The trend of increasing daylight hours peaks in August with 307 hours, offering an inviting prelude to autumn. September sees a gentle decline from this summer high but still outshines the earlier months of the year, notably surpassing January’s mere 155 hours. This consistent increase from January through to August reflects a vibrant warmth that gradually transitions into the cooler months, revealing September as a bridge between the flourishing days of summer and the mellow tones of fall. Even as the days shorten, September's sunlight lingers, enveloping the city in a warm embrace before autumn takes its full hold.
As September rolls in, Changshu, China, experiences a notable increase in sunny weather, with a 48% chance of sun gracing the city. This marks a substantial improvement from the peak of summer in July, which sees only a 19% chance of sunshine. Interestingly, while the chance of sunny days in September is still significantly lower than the winter months like November and December, it suggests a transition from the dampness of summer towards the crisp, clearer skies of autumn. Compared to the earlier months, where sunlit days are sparse, September offers a refreshing glimpse into the changing seasons, inviting residents and visitors alike to enjoy the early fall's charm.
As September rolls in Changshu, China, daylight begins to transition from the long, sunlit days of summer to the shorter days of autumn. With approximately 12 hours of daylight, September still maintains a generous amount of sunlight, though it marks a notable decline from the peak of 14 hours encountered in June. This gradual decrease reflects the seasonal shift, with daylight hours dipping from the summer highs in July and August. The pattern of increasing daylight from winter through spring culminates in a vibrant summer before this gentle decline begins, setting the stage for the cozy months ahead. As the days grow shorter, the rhythm of nature continues to invite contemplation and preparation for the beauty of autumn.
In September, the wind in Changshu, China picks up a gentle rhythm, averaging around 3.2 m/s (7 mph). This marks a slight increase following the calm breezes of August, which saw an average of only 2.7 m/s (6 mph). Notably, the autumn air begins to replace the summer stillness, yet wind speeds remain relatively consistent with early spring and late autumn, indicating a transitional period rather than drastic shifts. As the year progresses, wind patterns reveal a trend where summer months, particularly July, recorded the highest gusts at 4.2 m/s (9 mph), while winter months like December experience a lull, dropping back to 2.9 m/s (6 mph). Thus, September stands as a refreshing balance, blending the lively echoes of summer with the serene whispers of fall.
Weather in Changshu varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in Changshu, focusing on differences in temperature, rainfall, humidity, and UV levels.
September and January present striking contrasts in weather. In September, temperatures range from a minimum of 15°C (59°F) to a maximum of 35°C (95°F), with an average of 25°C (77°F), making it a warm and humid month characterized by significant precipitation of 134 mm (5.3 in) spread over 12 days, resulting in a humidity level of 81%. In stark contrast, January is much colder, featuring temperatures that drop to a minimum of -8°C (18°F) and peak at a maximum of 20°C (67°F), averaging just 5°C (41°F). Despite being a winter month, January experiences less precipitation at 54 mm (2.1 in) over 7 days and a lower humidity of 70%. For more details, you can refer to Changshu weather in January.
September and February present stark contrasts in weather conditions. In September, temperatures range from a mild 15°C (59°F) to a scorching maximum of 35°C (95°F), accompanied by high humidity at 81% and significant precipitation totaling 134 mm (5.3 in) over 12 days. In contrast, February experiences a cooler climate, with temperatures dipping as low as -5°C (23°F) and averaging just 6°C (44°F). This month is also marked by lighter precipitation of 56 mm (2.2 in) across 9 days and lower humidity at 73%. For a more detailed overview of February weather, visit Changshu weather in February.
When comparing the weather in September and March, we observe significant differences in temperature and precipitation. September boasts a warmer climate with an average temperature of 25°C (77°F), soaring as high as 35°C (95°F), while March is much cooler, with an average temperature of 12°C (53°F) and a maximum of 28°C (83°F). Both months experience similar humidity levels of 81%, but September records a much higher total precipitation of 134 mm (5.3 in) over 12 days compared to March's 68 mm (2.7 in) over 11 days. For more details on March weather, you can visit Changshu weather in March.
September typically experiences warmer temperatures compared to April, with a minimum of 15°C (59°F) and an average of 25°C (77°F), while April sees cooler temperatures starting as low as 4°C (40°F) and averaging 16°C (61°F). The maximum temperatures in September can reach up to 35°C (95°F), whereas in April, the highs peak at 32°C (90°F). Additionally, September is marked by higher precipitation, averaging 134 mm (5.3 in) over 12 days, in contrast to April’s 73 mm (2.9 in) over just 8 days. Humidity is also slightly higher in April at 87%, compared to 81% in September. For more details on April weather, you can visit Changshu weather in April.
September and May both present warm and moderately humid weather, but they have distinct differences. September typically sees slightly higher temperatures with an average of 25°C (77°F) and a maximum of 35°C (95°F), while May offers cooler conditions, averaging 22°C (71°F) and peaking at 37°C (99°F). In terms of precipitation, September experiences more rainfall, with 134 mm (5.3 in) over 12 days compared to May's 120 mm (4.7 in) across 10 days. Humidity levels are also notably high in both months, with September at 81% and May at 87%. For more detailed information, check Changshu weather in May.
In comparing the weather between September and June, both months present similar average temperatures at 25°C (77°F), but June tends to be slightly warmer with maximum temperatures reaching up to 38°C (100°F), compared to September's peak of 35°C (95°F). However, June experiences higher levels of precipitation, with 161 mm (6.3 in) falling over 12 days, compared to September's 134 mm (5.3 in) over the same number of days. Moreover, humidity levels are higher in June at 89%, compared to 81% in September, making June feel more humid and oppressive. For more detailed insights into June's climate, visit Changshu weather in June.
When comparing the weather in September and July, notable differences emerge. September experiences a milder temperature range with a minimum of 15°C (59°F) and an average of 25°C (77°F), while July is significantly hotter, with temperatures starting at a minimum of 19°C (66°F) and averaging 29°C (84°F), peaking at 42°C (108°F). Additionally, July sees higher precipitation levels, totaling 256 mm (10.1 in) over about 16 days, compared to September’s 134 mm (5.3 in) spread across 12 days. Humidity is also more pronounced in July at 93%, compared to September's 81%. For a detailed look at July weather in Changshu, check out Changshu weather in July.
In comparing the weather conditions of September and August, September generally presents a slight cooling trend. Average temperatures in September range from a minimum of 15°C (59°F) to a maximum of 35°C (95°F), while August experiences warmer weather with temperatures spanning from 21°C (70°F) to a sweltering 40°C (104°F). Although September sees slightly less rainfall, averaging 134 mm (5.3 in) over approximately 12 days, August has a bit more precipitation at 154 mm (6.1 in) over 14 days. Humidity levels are also noteworthy, with September’s average humidity at 81%, compared to August’s higher level of 91%. For a deeper look into August's weather specifics, you can refer to Changshu weather in August.
In September, temperatures range from a minimum of 15°C (59°F) to a maximum of 35°C (95°F), with an average of 25°C (77°F). The month is characterized by high humidity at 81% and considerable rainfall, totaling 134 mm (5.3 in) over 12 days. Conversely, October sees a notable drop in temperatures, with a minimum of 8°C (46°F) and an average temperature of 19°C (66°F) while still peaking at 33°C (91°F). Rainfall decreases significantly to 46 mm (1.8 in), occurring over just 7 days, and humidity remains slightly lower at 80%. For more detailed information on the weather in October, you can check Changshu weather in October.
In September, the weather is characterized by higher temperatures, with a minimum of 15°C (59°F), an average of 25°C (77°F), and a maximum reaching up to 35°C (95°F). The month experiences significant precipitation, totaling 134 mm (5.3 in) over about 12 days, accompanied by high humidity levels of 81%. In contrast, November brings a noticeable drop in temperatures, starting from a minimum of 1°C (34°F) and averaging 14°C (57°F), peaking at a maximum of 28°C (84°F). Precipitation in November is considerably lower, with only 44 mm (1.7 in) over approximately 6 days, while humidity remains slightly elevated at 82%. For more detailed insights into November weather, you can visit Changshu weather in November.
September and December weather in Changshu reveal a dramatic contrast in temperatures and precipitation. In September, the city experiences warm temperatures ranging from a minimum of 15°C (59°F) to a maximum of 35°C (95°F), coupled with significant humidity at 81% and substantial rainfall of 134 mm over 12 days. Conversely, December sees much cooler conditions, with temperatures dropping to a minimum of -6°C (21°F) and peaking at 21°C (70°F). The month also experiences much less precipitation, totaling only 42 mm over 8 days, and a slightly lower humidity level of 77%. For more information, check out Changshu weather in December.
As September rolls in, Changshu experiences a noticeable transition in weather, marked by a blend of warmth and increasing humidity. With average temperatures hovering at a comfortable 25°C (77°F), the month offers a pleasant escape from the summer heat, though highs can still reach a sweltering 35°C (95°F). Unlike the more arid summer months, September sees a rise in precipitation, with about 134 mm (5.3 in) of rain over 12 days, contributing to the lush greenery that characterizes the region. This combination of warmth and frequent showers creates a unique atmosphere, contrasting sharply with the drier, hotter days of July and August. To explore more about the climate trends throughout the year, visit Changshu Climate.