Last updated: August 21, 2025
September in Chang'an, China greets visitors with warm temperatures, where highs can reach up to 34°C (93°F) and average around 28°C (83°F). As summer transitions to autumn, the evenings cool down slightly to a comfortable 24°C (75°F). However, it’s essential to prepare for frequent rainfall, with a staggering 182 mm (7.2 in) of precipitation spread across about 21 days. This humidity level, hovering around 75%, adds to the rich, vibrant atmosphere of Chang'an, making it a unique time to experience the city’s historical charm amid its lush, green surroundings.
As September unfolds in Chang'an, China, the summer heat begins to wane, ushering in a more temperate atmosphere. With minimum temperatures around 24°C (75°F) and an average of 28°C (83°F), the month retains a warmth akin to late summer without the intense peaks. The maximum temperatures can reach up to 34°C (93°F), showcasing the lingering heat of the season. This marks a subtle transition; compared to the scorching heights of July and August, September offers a much more comfortable climate, inviting both locals and travelers to enjoy the cultural richness of the city. As the month progresses toward October, the promise of cooler evenings begins to emerge, signaling the onset of autumn while still embracing the last vestiges of summer's embrace.
In September, Chang'an experiences a notable shift in its precipitation patterns, with 182 mm (7.2 in) of rainfall spread over 21 days. This marks a decline from the peak of the rainy season in August, yet still contributes to the region's substantial moisture levels as summer transitions to autumn. The month serves as a bridge; while it retains a significant amount of rain, it is less intense than the heavy downpours of the preceding months, such as June with its 391 mm (15.4 in). Overall, September showcases a dynamic climate, as the days grow shorter and cooler, reminding residents that the robust summer rains are giving way to the milder, drier months ahead.
In September, Chang'an experiences a noticeable dip in humidity, averaging around 75%, following the sweltering summer months of July and August, which peak at a high 88%. This reduction provides a welcome reprieve, as the lingering monsoon season begins to wane, paving the way for a shift towards drier autumn months. Notably, May marks the onset of increased humidity, reaching its zenith during the peak of summer, while the trend gradually declines as the year transitions into fall. As such, September illustrates a crucial turning point, where the transition from humid days to more comfortable weather begins, setting the stage for the cooler months ahead.
September in Chang'an, China, continues the trend of high UV exposure seen through the summer months, maintaining an extreme UV Index of 11. This level indicates the necessity for caution, as the time it takes for skin to burn is notably short at just 10 minutes. Following a peak in May and June, the UV Index has started to stabilize slightly but remains a significant concern. As we transition into autumn, with October's UV Index dropping to 10, it's essential for residents and visitors alike to stay informed and protected. To learn more about the UV Index and its implications in Chang'an, check out Chang'an UV Index.
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In September, Chang'an, China enjoys a delightful continuation of summer with 276 hours of sunshine, showcasing a splendid transition into the autumn months. Following the peak sunshine of 309 hours in July, the city maintains a robust amount of sunlight that gradually tapers as the year progresses. The trend clearly indicates that after a vibrant peak in May, which reaches 282 hours, sunshine hours remain consistently high throughout the summer and early autumn, only to diminish as winter approaches. This balance of light creates an inviting atmosphere in September, perfect for enjoying the scenic beauty and cultural vibrancy of Chang'an before the cooler days set in.
In September, the likelihood of sunny weather in Chang'an, China, noticeably picks up, with a 43% chance of sunshine. This marks a significant improvement from the summer months, where the sunniest days are often overshadowed by humidity and cloud cover, culminating in a mere 15% in August and 12% in June. As the season transitions from the sweltering heat of summer, September offers a refreshing change, presenting an opportunity to enjoy clearer skies. While the sunny days are still less frequent than those in the chillier months of January and November, the increased chance of sun provides a perfect backdrop for outdoor activities before the cooler autumn sets in.
As September rolls in Chang'an, China, the daylight duration settles at 12 hours, mirroring the length seen in both March and April. This transitional month marks the end of the vibrant summer days, which peak in June and July with 13 hours of sunlight. Following the warm summer, daylight begins its gradual decline, reflecting the shifting seasons. After September, the days will shorten further, leading into the shorter hours of October and November, where daylight drops back to 11 hours. This gentle ebb and flow of sunlight not only shapes the daily rhythms of life in Chang'an but also beautifully illustrates the passage of time as summer transitions gracefully into autumn.
In September, the winds in Chang'an, China, take on a gentler touch, whirling at an average speed of just 2.1 m/s (5 mph). This marks the lowest point in the year, following a pattern of winds that have generally maintained a moderate pace through the warmer months. As summer fades, the wind slows down from August's 2.8 m/s (6 mph), hinting at the impending transition into autumn. Notably, October breathes new life into the air as winds pick up to 4.5 m/s (10 mph), signaling a shift toward the brisker conditions of fall. This gradual ebb and flow between the seasons showcases the dynamic climate of Chang'an, where each month brings its own unique character.
Weather in Chang'an varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in Chang'an, focusing on differences in temperature, rainfall, humidity, and UV levels.
September and January present stark contrasts in weather conditions. In September, temperatures range from a warm 24°C (75°F) to a hot 34°C (93°F), with an average of 28°C (83°F). The month experiences significant rainfall, totaling 182 mm (7.2 in) over 21 days, accompanied by high humidity levels of 75%. In contrast, January offers a much cooler climate, with temperatures varying from a chilly 6°C (43°F) to a pleasant 25°C (77°F), averaging around 17°C (62°F). Precipitation is minimal in January, amounting to just 35 mm (1.4 in) over 4 days and coupled with lower humidity at 64%. For more details on January weather, you can visit Chang'an weather in January.
The weather conditions in September and February contrast significantly, reflecting the transition from summer to winter. In September, temperatures are notably higher, with a minimum of 24°C (75°F) and an average of 28°C (83°F), peaking at a scorching 34°C (93°F). This month also witnesses considerable rainfall, with 182 mm (7.2 in) of precipitation spread over 21 days and a humidity level of 75%. Conversely, February offers a much cooler climate, with temperatures dropping to a minimum of 6°C (44°F), an average of 17°C (63°F), and a maximum of 26°C (80°F). Rainfall is significantly reduced, totaling only 62 mm (2.5 in) over 8 days, accompanied by lower humidity at 68%. For more details, you can explore Chang'an weather in February.
In September, the weather is significantly warmer, with temperatures ranging from a minimum of 24°C (75°F) to a maximum of 34°C (93°F) and an average of 28°C (83°F). This month also experiences high humidity at 75% and substantial precipitation of 182 mm (7.2 in) over 21 days, indicating a wet and muggy climate. In contrast, March offers a cooler climate, with temperatures ranging from 11°C (52°F) to 28°C (83°F) and an average of 21°C (70°F). Precipitation is lower at 95 mm (3.7 in) across 14 days, and humidity is slightly lower at 73%. For a closer look at the specific weather conditions during March, check out Chang'an weather in March.
September typically brings warmer temperatures compared to April, with minimums around 24°C (75°F) and maximums reaching up to 34°C (93°F), making it a hotter month overall. In contrast, April sees more moderate temperatures, with a minimum of 13°C (56°F) and a maximum of 30°C (86°F). Precipitation also differs, as September experiences significantly more rain with 182 mm (7.2 in) over 21 days, while April has less rainfall at 128 mm (5.1 in) spread across 13 days. Despite this, humidity levels are relatively similar, at 75% in September and 71% in April. For more detailed information on April's climate, you can visit Chang'an weather in April.
In comparing September and May weather, September tends to be hotter, with average temperatures ranging from a minimum of 24°C (75°F) to a maximum of 34°C (93°F), compared to May’s milder range of 17°C (63°F) to 33°C (92°F). While both months experience significant rainfall, May has slightly more precipitation at 210 mm (8.3 in) over 20 days, compared to September's 182 mm (7.2 in) over 21 days. Humidity levels are also slightly higher in May at 79%, versus 75% in September, making May feel more humid overall. For more detailed information, check out Chang'an weather in May.
When comparing the weather in September and June, both months exhibit similar average temperatures, with September showing a minimum of 24°C (75°F) and an average of 28°C (83°F), while June has a minimum of 24°C (76°F) and an average of 28°C (84°F). However, June tends to be wetter, receiving 391 mm (15.4 in) of precipitation over 26 days, compared to September's 182 mm (7.2 in) across 21 days. Humidity levels are also slightly higher in June at 77%, compared to September's 75%. Overall, June is characterized by more rainfall and slightly higher humidity, making it a more humid month than September. For more detailed information, you can visit Chang'an weather in June.
In July, the weather tends to be hotter, with average temperatures ranging from a minimum of 25°C (78°F) to a maximum of 35°C (95°F), compared to September, where temperatures are slightly cooler, with a minimum of 24°C (75°F) and a maximum of 34°C (93°F). July also experiences higher humidity at 88%, making it feel more oppressive than September's humidity level of 75%. Rainfall is notably higher in July, with 196 mm (7.7 in) across 24 days, compared to September's 182 mm (7.2 in) over 21 days. For a more detailed look at July weather, check out Chang'an weather in July.
In comparing the weather between September and August, September experiences slightly cooler temperatures with a minimum of 24°C (75°F) and an average of 28°C (83°F), while August has a minimum of 26°C (78°F) and an average of 29°C (84°F). Additionally, September sees a reduction in maximum temperatures, peaking at 34°C (93°F), compared to August's hotter maximum of 35°C (95°F). While both months are quite humid, September has a lower humidity level of 75% compared to August's 88%. However, September is markedly wetter, with 182 mm (7.2 in) of precipitation over 21 days, compared to August's 356 mm (14.0 in) over 26 days. For more details on August weather, visit Chang'an weather in August.
September and October show a notable shift in weather patterns, reflecting the transition from late summer to early autumn. In September, the temperatures are higher with a minimum of 24°C (75°F) and an average of 28°C (83°F), peaking at 34°C (93°F), alongside significant precipitation of 182 mm (7.2 in) across 21 days, contributing to a humid atmosphere with 75% humidity. In contrast, October brings cooler temperatures, with a minimum of 16°C (62°F) and an average of 25°C (78°F), while the maximum temperature remains relatively warmer at 33°C (92°F). The month also experiences reduced rainfall, with only 118 mm (4.6 in) over just 9 days, resulting in lower humidity levels of 65%. For more detailed information, you can visit Chang'an weather in October.
In September, the weather is characterized by warmer temperatures, with a minimum of 24°C (75°F) and an average of 28°C (83°F), peaking at a maximum of 34°C (93°F). This month sees significant rainfall, with 182 mm (7.2 in) spread over 21 days, contributing to a high humidity level of 75%. In contrast, November brings a noticeable shift, as temperatures drop to a minimum of 14°C (58°F) and average around 22°C (72°F), with a maximum of 29°C (85°F). Precipitation is minimal during this month, totaling just 26 mm (1.0 in) over 5 days, and humidity decreases to a more comfortable 64%. For a more detailed look at November weather, visit Chang'an weather in November.
September and December present striking contrasts in weather. In September, temperatures remain warm, with an average of 28°C (83°F) and highs reaching up to 34°C (93°F), while the humidity is relatively high at 75%. Rainfall is common during this month, with approximately 182 mm (7.2 in) spread over 21 days. In stark contrast, December experiences much cooler temperatures, averaging 17°C (64°F) and peaking at a maximum of 27°C (81°F). Precipitation drops significantly to just 23 mm (0.9 in) over 4 days, accompanied by a lower humidity of 69%. For more details, you can check Chang'an weather in December.
As September unfolds in Chang'an, the weather signals a definite transition from the sweltering heat of summer to a more humid and rainy climate. While temperatures remain warm, averaging a comfortable 28°C (83°F), the notable increase in precipitation and humidity sets this month apart from its drier predecessors. With rain gracing the region for over two-thirds of the month, the lush landscapes flourish, creating a vibrant setting that contrasts sharply with the dry spells experienced earlier in the year. This blend of warmth and moisture fosters a unique atmosphere that invites exploration and appreciation of Chang'an's natural beauty. For a comprehensive overview of what to expect throughout the year, visit Chang'an Climate.