Last updated: August 21, 2025
Experience the diverse weather of Xi'an, China in September, where temperatures range from a comfortable maximum of 28°C (83°F) to a cooler minimum of 1°C (34°F), with an average of 15°C (60°F). This month captures the essence of early autumn, bringing 81 mm (3.2 in) of precipitation over 10 days. High humidity levels at 86% create a unique atmosphere, ideal for exploring the city's rich history and stunning landscapes. Prepare for a mix of sunny days and gentle rains as you discover all that Xi'an has to offer!
September in Xi'an, China ushers in a notable transition as summer's heat gives way to the crispness of autumn. With minimum temperatures around 1°C (34°F) and a pleasant average of 15°C (60°F), the days remain warm but manageable, peaking at a comfortable 28°C (83°F). This month marks a distinct change in the climate compared to the sweltering midsummer, making it an ideal time for outdoor exploration and appreciating the city's rich historical tapestry. As temperatures gradually descend, the vibrant hues of fall begin to replace the summer greens, creating a picturesque backdrop for both locals and travelers alike.
In September, Xi'an experiences a notable shift in weather patterns as it bids farewell to the intense summer heat. With an average precipitation of 81 mm (3.2 in) spread across 10 days, this month marks a significant drop from the torrential rains of August, which saw a staggering 177 mm (7.0 in). The transition to autumn brings a refreshing balance, as the rainfall begins to taper off while still providing essential moisture for the region. This mid-season respite prepares the landscape for the drier months ahead, evident in October's forecast of just 30 mm (1.2 in). Overall, September stands out as a transitional month that blends the tail end of summer's bounty with the impending coolness of fall, inviting a mellower rhythm to daily life in Xi'an.
In September, Xi'an, China experiences a notable humidity level of 86%, continuing the trend of high moisture that characterizes the late summer months. Following the peak of 88% in August, humidity begins to decline slightly but remains elevated compared to earlier months. This lingering humidity echoes the patterns observed from June onward, where the city grapples with its damp climate, peaking in summer. As autumn approaches, the gradual decrease in humidity hints at the upcoming transition into drier and cooler conditions, with October bringing a further drop to 83%. Overall, September serves as a bridge between the sultry summer and the more moderate fall, marking it as a time of lingering warmth and humidity in Xi'an.
As summer fades into fall, September in Xi'an, China, sees a shift in the UV Index, reflecting an overall trend of decreasing sun intensity. With a UV Index of 7, categorized as high, residents and visitors alike should be mindful of sun exposure, as the recommended burn time increases to 25 minutes. This is a notable drop from the very high levels experienced in July and August, which boasted Index scores of 10 and 9 respectively. The moderate sunlight in March, with an Index of 5, resonates as a distant memory, while the upcoming cooler months promise further reductions in UV levels. Embrace the waning sunlight but remember to protect your skin with proper precautions as the intensity still warrants attention. For further insights on UV trends, check out the Xi'an UV Index.
UV Risk Categories
September in Xi'an, China, welcomes a beautiful transition from summer to autumn, basking in 282 hours of sunshine. This month stands as a remarkable capstone to the sun-drenched days of July and June, which boast the highest sunshine hours at 343 hours and 318 hours, respectively. As the weather begins to cool down, September manages to retain a significant amount of sunlight, only slightly below August’s generous 291 hours. This trend highlights a gradual decline in brightness as the year progresses, with sunshine hours gradually decreasing toward the cooler months of October and November. October brings a noticeable dip to 261 hours, while November falls further to 215 hours, underscoring September's role as a bridge between the vibrant heat of summer and the crispness of autumn. Overall, September serves as a delightful reminder of warmth before the days grow shorter.
As summer transitions into autumn, September in Xi'an, China offers a modest 37% chance of sunny weather, making it one of the less favorable months for sun seekers. This slight dip follows the peak sunlight months of January and October, which boast 58% likelihood, while the summer months struggle below 40%. The pattern indicates a gradual decline in sunny days as the year progresses, with September's chance being slightly higher than the summer months of July and August, yet still lower than the vibrant spring conditions found in March. As such, September beckons both a hint of summer warmth and the promise of cooler autumn days, even if the sun may not always shine brightly.
As summer transitions to autumn in Xi'an, China, September brings a gentle reduction in daylight, offering about 12 hours of sunshine each day. This marks a subtle shift from the sun-soaked months of July and August, when residents basked in 15 and 13 hours of daylight, respectively. The gradual decline in daylight hours, which began in June, signals the approach of shorter days ahead. With the vibrant fall foliage set against softer light, September provides a beautiful balance as it embraces cooler temperatures and the early signs of seasonal change, making it a perfect time for leisurely outdoor activities and exploration before the days grow even shorter.
In September, Xi'an experiences a gentle shift in wind patterns, with an average wind speed of 2.1 m/s (5 mph)—slightly lower than the preceding summer months. As the city transitions from the heat of August with its 2.5 m/s (6 mph) breezes, the early hints of autumn bring a calmer atmosphere, often marked by soft, refreshing gusts that rustle through the ancient streets. This tranquil wind offers a perfect backdrop for leisurely strolls among the historic sites, inviting both locals and visitors to bask in the mild climate as the city prepares for the brisker days of October. Overall, September's wind reflects a gradual descent into the more dynamic wind speeds that will flourish in the later months, epitomizing the serene change of seasons in this storied locale.
Weather in Xi'an varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in Xi'an, focusing on differences in temperature, rainfall, humidity, and UV levels.
September and January exhibit strikingly different weather patterns. In September, temperatures range from a mild 1°C (34°F) at night to a warm 28°C (83°F) during the day, with an average of 15°C (60°F). There is also a significant amount of rainfall, with precipitation totaling 81 mm (3.2 in) over approximately 10 days, accompanied by high humidity at 86%. In contrast, January brings frigid temperatures, with nighttime lows plummeting to a chilling -30°C (-22°F) and daytime highs barely reaching 1°C (33°F), averaging -15°C (5°F). Additionally, January is much drier, with only 6 mm (0.3 in) of precipitation over just 1 day and humidity slightly lower at 84%. For a closer look at January conditions, please refer to Xi'an weather in January.
September and February present drastically different weather conditions. In September, temperatures range from a cool 1°C (34°F) at night to a warm 28°C (83°F) during the day, with an average of 15°C (60°F). This month also sees relatively high humidity at 86% and experiences about 81 mm (3.2 in) of precipitation over approximately 10 days. In contrast, February is characterized by significantly colder temperatures, with nighttime lows plunging to -26°C (-14°F) and daytime highs reaching only 7°C (44°F); the average temperature sits around a frigid -12°C (11°F). Precipitation is minimal in February, amounting to just 9 mm (0.3 in) over about 2 days and the humidity is slightly lower at 79%. For those interested in a more detailed analysis of February weather, check out Xi'an weather in February.
September and March present strikingly different weather conditions. In September, temperatures range from a mild 1°C (34°F) at night to a warm 28°C (83°F) during the day, with an average of 15°C (60°F). This month typically sees about 81 mm (3.2 in) of precipitation over 10 days, accompanied by high humidity at 86%. In contrast, March is much colder, with nighttime lows plunging to -25°C (-12°F) and daytime highs reaching a more temperate 20°C (68°F), averaging around -1°C (30°F). March experiences significantly less precipitation, totaling 24 mm (0.9 in) over just 5 days, along with lower humidity levels at 71%. For more detailed insights, you can visit Xi'an weather in March.
In September, temperatures in Xi'an can vary significantly, ranging from a chilly 1°C (34°F) at night to a warm 28°C (83°F) during the day, with an average temperature of 15°C (60°F). The month experiences substantial precipitation, totaling 81 mm (3.2 in) over approximately 10 days, accompanied by high humidity levels of 86%. In contrast, April sees cooler temperatures with a minimum of -6°C (21°F) and an average of 7°C (46°F), while the maximum can reach 30°C (86°F). Rainfall is lighter in April, with only 31 mm (1.2 in) over 6 days and lower humidity at 65%. For more detailed insights, you can check Xi'an weather in April.
When comparing the weather in September and May, some notable differences emerge. In September, temperatures range from a minimum of 1°C (34°F) to a maximum of 28°C (83°F), with an average temperature of 15°C (60°F). The humidity is quite high at 86%, and the month experiences an average of 81 mm (3.2 in) of precipitation over about 10 days.
In contrast, May sees slightly warmer temperatures, with a minimum of 1°C (33°F) and a maximum of 33°C (91°F), resulting in an average temperature of 14°C (58°F). The humidity is lower at 70%, and although May has a similar number of rainy days (12), it receives less total precipitation at 72 mm (2.8 in).
For more detailed information about Xi'an’s weather during May, you can check out this link: Xi'an weather in May.
In comparing the weather of September and June, we see notable differences in temperature and precipitation. September experiences a wider temperature range, with a minimum of 1°C (34°F) and a maximum of 28°C (83°F), resulting in an average of 15°C (60°F). In contrast, June has a milder minimum of 6°C (42°F) and can reach as high as 35°C (95°F), with an average temperature of 18°C (65°F). Both months have significant precipitation, with September receiving 81 mm (3.2 in) over about 10 days and June totaling 91 mm (3.6 in) across 15 days. Interestingly, September's humidity is slightly higher at 86%, compared to June's 82%. For a closer look at the specific conditions in June, check out Xi'an weather in June.
When comparing the weather in September and July, notable differences emerge. September sees cooler temperatures, with a minimum of 1°C (34°F) and an average of 15°C (60°F), while July is considerably warmer, boasting a minimum of 12°C (54°F) and an average of 23°C (74°F). The maximum temperature in July reaches up to 35°C (95°F), compared to September's peak of 28°C (83°F). Additionally, both months experience a significant amount of precipitation, with September receiving 81 mm (3.2 in) over 10 days and July recording 99 mm (3.9 in) over 12 days. Humidity levels are also fairly high, with September at 86% and July slightly higher at 87%. For more detailed insights, you can check out Xi'an weather in July.
In comparing the weather between September and August, September typically presents a notable shift in temperature and precipitation patterns. While August boasts higher temperatures, with an average of 21°C (70°F) and a maximum reaching 35°C (96°F), September cools down significantly, featuring an average temperature of 15°C (60°F) and a maximum of 28°C (83°F). Additionally, August experiences greater rainfall, with a total of 177 mm (7.0 in) over 15 days, compared to September's 81 mm (3.2 in) spread across 10 days. Humidity remains relatively high in both months, with September slightly lower at 86% compared to August's 88%. For more detailed information, you can check Xi'an weather in August.
September typically features milder temperatures with an average of 15°C (60°F), while October sees a notable drop, averaging just 7°C (44°F). Although both months can reach a high of 28°C (83°F), October notably includes colder nights, with temperatures dipping as low as -7°C (21°F). In terms of precipitation, September is wetter with 81 mm (3.2 in) over 10 days compared to October's 30 mm (1.2 in) across just 5 days, indicating a shift toward drier conditions as autumn progresses. Humidity remains relatively high in both months, at 86% in September and slightly lower at 83% in October. For more details about the weather trends in October, you can visit Xi'an weather in October.
September and November exhibit striking differences in weather conditions. In September, temperatures range from a cool 1°C (34°F) at night to a pleasant maximum of 28°C (83°F) during the day, with an average of 15°C (60°F). The month experiences about 81 mm (3.2 in) of precipitation over ten days and humidity levels reaching 86%. In contrast, November ushers in much colder temperatures, with nighttime lows plummeting to -18°C (0°F) and an average temperature of -3°C (27°F), peaking at a milder 16°C (60°F). Precipitation decreases significantly to 39 mm (1.5 in) over just five days, and humidity lowers to 65%. For more specific details, you can check out Xi'an weather in November.
September and December present striking contrasts in weather. In September, temperatures hover between a mild 1°C (34°F) and a warm 28°C (83°F), with an average of 15°C (60°F). During this month, the region experiences a fair amount of rain, totaling 81 mm (3.2 in) over about 10 days, and humidity is high at 86%. In sharp contrast, December sees significantly colder conditions, with temperatures ranging from a frigid -28°C (-19°F) to a maximum of 8°C (46°F), averaging -13°C (9°F). Precipitation drops to just 10 mm (0.4 in) over only 2 days, and humidity decreases to 66%. For more details, you can visit Xi'an weather in December.
As September graces Xi'an, the city transitions into a blend of mild warmth and refreshing humidity, creating a unique atmosphere that sets it apart from the hotter summer months. With an average temperature hovering comfortably around 15°C, it provides a perfect escape from the sweltering heat experienced earlier in the season. While precipitation is relatively moderate, bringing about 10 rainy days, the overall climate remains pleasant, making it an ideal time for exploration. This month showcases a harmonious balance between the lingering warmth of summer and the crisp approach of autumn, truly embodying the essence of Xi'an's seasonal charm. For those seeking to understand the broader climate patterns, check out Xi'an Climate.