Last updated: August 21, 2025
In September, the weather in Chang'an, China transitions as summer gives way to autumn, showcasing a remarkable range in temperatures. The month sees maximum temperatures reaching 29°C (84°F), while the average falls to a mild 15°C (60°F), with a cool minimum of 1°C (34°F). Precipitation is prevalent, averaging 122 mm (4.8 in) over approximately 12 days, contributing to a notably high humidity of 86%. This combination creates a unique atmospheric ambiance, making September an intriguing time to experience Chang'an's evolving climate.
In September, Chang'an, China, experiences a welcome transition from the sweltering summer heat into a more moderate climate, making it a delightful time to visit. With average temperatures hovering around 15°C (60°F), the city enjoys a pleasant mix of warm days and cool nights. Daily highs can reach up to 29°C (84°F), providing ample opportunities for outdoor exploration, while nighttime temperatures dip to a crisp 1°C (34°F), hinting at the chill of autumn just around the corner. This month stands out as a perfect balance; not only does it offer a reprieve from the intense summer warmth, but it also sets the stage for the dramatic seasonal changes that follow in October and November. The gradual decline in warmth is a gentle reminder of nature's rhythm, inviting residents and visitors alike to embrace the beauty of transition.
September in Chang'an, China, marks a significant transition in the region's weather patterns, as the precipitation dips from the peak levels of the summer months. Receiving 122 mm (4.8 in) of rain over 12 days, September retains a substantial amount of moisture, although it is notably less than the 203 mm (8.0 in) experienced in August. This month's rainfall is characteristic of late summer, where sporadic storms continue to grace the landscape, contributing to the vibrant autumn colors that soon follow. As the days shorten and temperatures begin to cool, the decrease in both the amount and frequency of precipitation foreshadows the drier conditions that the following months will bring.
September in Chang'an, China, marks a subtle transition in humidity, reflecting the lingering warmth of summer with an average of 86%. This high level follows August's peak of 88%, highlighting a trend of increasing moisture during the height of the summer months. However, as the city approaches autumn, a gradual decline begins, with humidity expected to drop significantly in the following months. Notably, the humidity levels in September are still notably elevated compared to earlier in the year, where January saw an average of 84%. This trend not only showcases the seasonal shift but also the overall humid climate that characterizes Chang'an throughout the year. As the city moves into October, residents can anticipate a gradual yet refreshing decrease, paving the way for the drier months ahead.
In September, Chang'an experiences a notable transition in its UV Index, dropping to 6, categorized as high. This indicates a slight decline from the peak summer months, where July reached a scorching 10. With a burn time of 25 minutes, residents and visitors are reminded to take precautions while enjoying the lingering warmth of early autumn. Throughout the year, Chang'an's UV levels fluctuate dramatically; for instance, January marks the lowest with a UV Index of 2, while May and June often see it soar to 8 and 9. This trend highlights the importance of sun safety as the UV Index gradually decreases from the intense summer sun, making this a prime time to enjoy outdoor activities without the extreme risks. For more details, check out the Chang'an UV Index.
UV Risk Categories
As the summer sun begins to wane, September in Chang'an embraces a gentle warmth with 278 hours of sunshine, signaling a transition into autumn. Following the peak of July's vibrant 332 hours, the light gradually softens, giving way to a delightful balance of warmth and cool breezes. This decrease continues from August's 284 hours, marking a subtle shift that welcomes the picturesque hues of fall. Despite the slight dip, September still enjoys ample sunshine, aligning it with spring months' brightness rather than the dimmer days of late autumn and winter, which see significantly lower totals like November's 211 hours. This trend highlights Chang'an's delightful climate, where autumn remains brilliantly illuminated, inviting residents and visitors alike to savor the enchanting beauty of the season.
In September, Chang'an, China, experiences a moderate 40% chance of sunny weather, marking a slight uptick from the summer months of July and August, which see notably lower probabilities of sunshine at 26% and 35%, respectively. As the city transitions into autumn, this month offers a balance between the fading heat of summer and the cooler days ahead, with the likelihood of sun improving again in October to 59%. While September may not guarantee clear skies, it presents a refreshing opportunity for outdoor activities as the overall climate begins to shift, making it a pleasant time to enjoy the lingering warmth before the colder months set in.
As summer transitions to autumn in Chang'an, China, September witnesses a notable shift in daylight duration, with the sun gracing the skies for 12 hours each day. This marks a gradual decline from the peak of 15 hours enjoyed in June and July, as the longer days of summer gradually yield to the shorter daylight hours that will characterize the coming months. Following September, the daylight diminishes further into October, where it drops to 10 hours, setting the stage for winter's embrace. This rhythmic cycle of changing daylight not only highlights the natural beauty of the season but also invites a reflection on the fleeting nature of time as it shifts from vibrant summer days to the more subdued ambiance of autumn.
As September unfolds in Chang'an, the winds whisper at an average speed of 2.5 m/s (6 mph), marking a gentle transition from the warmer summer months. This slight dip in wind speed mirrors the easing temperatures, providing a serene backdrop as the city prepares for autumn's arrival. Throughout the year, wind patterns reveal interesting trends; the winters are brisk with speeds peaking around 3.6 m/s (8 mph) in April and November, while the sultry summer months see a retreat to calmer breezes, particularly in July, when winds slow to just 2.0 m/s (5 mph). As the seasons shift, September's moderated winds suggest a subtle dance between the lingering warmth of summer and the crisp promise of fall, setting the stage for nature's transition in this historic city.
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.
In comparing the weather of September and January, the contrast is striking. September experiences a comfortable range of temperatures, with a minimum of 1°C (34°F) and a maximum of 29°C (84°F), while January plunges into the depths of winter with temperatures ranging from a chilling -34°C (-30°F) to a maximum of -2°C (29°F). Additionally, September sees a significant amount of rainfall, accumulating 122 mm (4.8 in) over 12 days, contributing to an humid atmosphere with an average humidity of 86%. In contrast, January is much drier, with only 7 mm (0.3 in) of precipitation falling over just 2 days and maintaining a slightly lower humidity level of 84%. For a more detailed look at January's weather, you can visit Chang'an weather in January.
When comparing the weather between September and February, the differences are striking. September enjoys mild temperatures with a minimum of 1°C (34°F) and an average of 15°C (60°F), peaking at a warm 29°C (84°F). However, February presents a stark contrast, with frigid conditions where temperatures can plunge to as low as -31°C (-24°F) and typically hover around -13°C (8°F). Additionally, September experiences significantly more precipitation, with 122 mm (4.8 inches) over 12 days, while February is much drier, only recording 10 mm (0.4 inches) over just 3 days. Humidity levels remain high in September at 86%, yet they are slightly lower in February at 79%. For more details on February weather, you can check out this link: Chang'an weather in February.
September weather is characterized by warmer temperatures and higher humidity levels compared to March. With minimums around 1°C (34°F) and maximums reaching 29°C (84°F), September offers an average temperature of 15°C (60°F) and experiences significant precipitation at 122 mm (4.8 in) over 12 days. In contrast, March presents a much colder climate, with temperatures ranging from a minimum of -26°C (-15°F) to a maximum of 19°C (66°F), resulting in an average of -2°C (28°F). Additionally, March sees much less precipitation at 22 mm (0.9 in) over only 6 days and lower humidity at 71%. For more details on March conditions, refer to Chang'an weather in March.
The weather in September is generally milder and more varied than in April. September sees temperatures ranging from a minimum of 1°C (34°F) to a maximum of 29°C (84°F), with an average of 15°C (60°F), while April experiences colder conditions, with temperatures ranging from a minimum of -9°C (17°F) to a maximum of 25°C (77°F) and an average of 7°C (45°F). Additionally, September is considerably wetter, receiving 122 mm (4.8 in) of precipitation over 12 days, compared to April’s lighter rainfall of 32 mm (1.2 in) over just 5 days. However, September also has higher humidity at 86%, whereas April maintains a lower humidity level of 65%. For more detailed insights into April weather specifically, you can refer to Chang'an weather in April.
In September, temperatures range from a cool 1°C (34°F) to a warm 29°C (84°F), with an average of 15°C (60°F), making it a transitional month as summer begins to fade. The month experiences higher humidity at 86% and sees significant rainfall, totaling 122 mm (4.8 in) over 12 days. In contrast, May brings slightly milder weather with temperatures ranging from 1°C (34°F) to a peak of 32°C (89°F) and an average of 14°C (58°F). This month also has lower precipitation at 84 mm (3.3 in) across 11 days and reduced humidity levels at 70%, offering a more comfortable climate. For more details, check out Chang'an weather in May.
In comparing the weather patterns of September and June, we observe notable differences in temperature and precipitation. September temperatures range from a chilly minimum of 1°C (34°F) to a pleasant average of 15°C (60°F), peaking at 29°C (84°F). In contrast, June boasts a milder minimum of 7°C (45°F) with an average of 19°C (66°F) and a maximum of 34°C (93°F). While September experiences about 122 mm (4.8 in) of precipitation over 12 days and high humidity levels at 86%, June slightly surpasses it with 128 mm (5.0 in) of rain spread over 15 days and a lower humidity of 82%. For a detailed overview of June weather, visit Chang'an weather in June.
In comparing the weather between September and July, it's clear that July tends to be warmer and more humid. July boasts an average temperature of 24°C (75°F), with a maximum reach of 34°C (93°F), while September's average temperature lowers to 15°C (60°F) with a maximum of 29°C (84°F). Although July has slightly higher precipitation at 147 mm (5.8 in) over 17 days compared to September's 122 mm (4.8 in) over 12 days, both months share a similar humidity level, with July at 87% and September at 86%. For more specific details about July weather, you can visit Chang'an weather in July.
In comparing the weather of September and August, significant differences emerge. September experiences cooler temperatures with a minimum of 1°C (34°F) and an average of 15°C (60°F), while August sees milder conditions, with a minimum of 7°C (44°F) and an average of 21°C (70°F). Additionally, August tends to be wetter, receiving 203 mm (8.0 in) of precipitation over 17 days, in contrast to September, which has 122 mm (4.8 in) across 12 days. Humidity levels are similarly high, with September at 86% and August slightly higher at 88%. For a more detailed look at August weather, you can visit Chang'an weather in August.
September and October exhibit distinct weather patterns. In September, temperatures range from a minimum of 1°C (34°F) to a maximum of 29°C (84°F), averaging around 15°C (60°F). This month also experiences relatively high humidity at 86% and considerable rainfall, with 122 mm (4.8 in) over 12 days. In contrast, October sees a notable drop in average temperatures, with a minimum of -9°C (16°F), an average of 6°C (44°F), and a maximum of 28°C (82°F). Precipitation decreases significantly, only totaling 29 mm (1.1 in) over just 6 days, and humidity remains slightly lower at 83%. For more detailed insights, you can visit Chang'an weather in October.
September and November present stark contrasts in weather patterns. In September, temperatures range from a mild 1°C (34°F) at night to a warm average of 15°C (60°F) during the day, with highs reaching up to 29°C (84°F). This month also sees significant rainfall, with 122 mm (4.8 in) of precipitation spread over 12 days and high humidity levels at 86%. In contrast, November brings much colder conditions, with nighttime temperatures plummeting to -22°C (-7°F) and an average temperature of -4°C (25°F). Daytime highs are much more subdued, maxing out at 13°C (56°F), and precipitation decreases to 32 mm (1.3 in) over just 6 days, accompanied by lower humidity levels at 65%. For a more detailed look at November weather, you can visit Chang'an weather in November.
September and December offer stark contrasts in weather conditions. In September, temperatures range from a minimum of 1°C (34°F) to a maximum of 29°C (84°F), with an average of 15°C (60°F). This month typically experiences 122 mm (4.8 in) of precipitation over about 12 days, accompanied by high humidity levels at 86%. Conversely, December plunges into the depths of winter, featuring a significant drop in temperatures, with a minimum of -29°C (-20°F), an average of -15°C (5°F), and a maximum of 7°C (44°F). The month sees much less precipitation, totaling only 11 mm (0.4 in) over just 2 days and lower humidity at 66%. For an in-depth look at December's weather conditions, you can explore Chang'an weather in December.
As September transitions into autumn, Chang'an experiences a distinct change in weather compared to the summer months. The temperatures begin to dip from the highs of July and August, with pleasant averages making for cooler, comfortable days. However, the increased humidity and frequent rainfall—spanning about half the month—result in a refreshing yet unpredictable climate. This shift not only brings a notable change in daily activities but also highlights the region's variable nature, setting the stage for a vibrant fall. For more insights on the overall weather patterns, visit Chang'an Climate.