September Weather in Chang'an, China

Last updated: August 21, 2025

September in Chang'an, China offers a transition from the heat of summer to the crispness of autumn, with maximum temperatures peaking at 29°C (85°F) and averaging around 16°C (61°F). Nights can be brisk, with temperatures dipping down to a cool 1°C (34°F). The month experiences moderate rainfall, totaling 78 mm (3.1 in) over approximately 9 days, contributing to an humidity level of 84% that envelops the area in a gentle, moist embrace. This combination of warm days and fresh evenings makes September an inviting time to explore the city's cultural wonders and natural beauty.

September Temperature in Chang'an

In September, Chang'an, China experiences a notable shift in temperatures as summer transitions to autumn. The average temperature hovers around 16°C (61°F), offering a refreshing respite from the sweltering heat of the previous months. With daily minimums dipping to 1°C (34°F) and maximums reaching a comfortable 29°C (85°F), this month provides a pleasant blend of warmth during the day and cooler nights. This mild weather not only invites outdoor exploration but also signifies the gradual approach of cooler days ahead, a stark contrast to the intense heat of August. As the season evolves, September serves as a picturesque bridge between the lingering warmth of summer and the crispness of fall.

September Weather in Chang'an: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in Chang'an, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Chang'an, September typically has an average temperature of {2}°C ({3}°F), with highs reaching up to {4}°C ({5}°F) and lows dropping to around {6}°C ({7}°F).
JanFebMarAprMayJunJulAugSepOctNovDec111733465764727161463014
Data source: Temperature data for Chang'an generated using information from the Copernicus Climate Change Service.
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The average of daily temperatures (24 hours) calculated across all days in the month.

September Precipitation in Chang'an

September in Chang'an, China, sees a notable shift in weather patterns as the summer rains begin to recede. With 78 mm (3.1 in) of precipitation recorded over 9 days, the month marks a significant drop from August's peak of 182 mm (7.2 in) while still supporting a moderately wet environment. This change signals the transition toward autumn, where rainfall becomes less frequent but remains impactful, adding to the year’s cumulative total. The trend is evident as the wettest months of the year—July and August—give way to a gradual decline, paving the way for drier October, which typically receives only 35 mm (1.4 in). As such, September stands as a bridge between the lush summer and the drier fall, highlighting the evolving climate of Chang'an.

September Precipitation Trends in Chang'an

The chart displays monthly precipitation patterns in Chang'an, with values for each month alongside September’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how September’s conditions compare to those of other months. In Chang'an, September typically receives around {2} mm ({3} inches) of precipitation spread over approximately {4} days.
JanFebMarAprMayJunJulAugSepOctNovDec7132827778010118278353610
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
Choose your preferred precipitation unit

September Humidity in Chang'an

In September, Chang'an, China experiences a notable shift in humidity levels, registering at 84%. This marks a decrease from the peak summer months, where humidity soared to 89% in August and 87% in July, creating a muggy atmosphere. As the seasons transition towards autumn, September’s humidity indicates a gradual relief from the intense moisture that characterized the preceding months. However, the level remains relatively high compared to other fall months, like November at 67%. This trend suggests September serves as a bridge, maintaining a damp warmth before the humidity continues to decline, leading seamlessly into the cooler, drier months ahead.

September Average Humidity in Chang'an

This chart illustrates the average monthly humidity levels in Chang'an, with September’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In September, average humidity in Chang'an is approximately {2}%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec78%75%70%65%72%82%87%89%84%83%67%70%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Chang'an

In September, Chang'an experiences a UV Index of 7, categorizing the exposure as high with a burn time of 25 minutes. This marks a notable drop from the intense levels of 10 seen during the summer months of July and August, where the risk was categorized as very high. As autumn approaches, the UV Index gradually decreases, reflecting a trend of diminishing sunlight intensity. With this shift, outdoor enthusiasts can enjoy the beautiful early fall weather while still being mindful of UV exposure. For further details on UV levels throughout the year, visit Chang'an UV Index.

Maximum UV Index Levels in Chang'an for September

The chart shows the monthly maximum UV Index (UVI) for Chang'an in September, representing the highest UV radiation level. The UVI measures the intensity of ultraviolet radiation from the sun, indicating the potential risk of sunburn and UV-related health issues. In September, the maximum UV index in Chang'an typically reaches {2}, which falls under the {3} exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec23578910107532
Data source: Chang'an September UVI data generated using information from the Copernicus Climate Change Service.

UV Risk Categories

  •  Extreme (11+): Avoid the sun, stay in shade.
  •  Very High (8-10): Limit sun exposure.
  •  High (6-7): Use SPF 30+ and protective clothing.
  •  Moderate (3-5): Midday shade recommended.
  •  Low (0-2): No protection needed.

September Sunshine in Chang'an

As summer wanes and autumn approaches, September in Chang'an, China, enjoys a gentle embrace of sunlight, with 278 hours shining down on the city. This marks a slight drop from the peak of 312 hours in July, as the long, sunny days of summer start to recede. However, September still offers a generous amount of sunshine, exceeding the earlier months of the year, such as January, which had only 192 hours. The gradual transition from the sweltering heights of summer to more temperate climes is reflected in the steady decline in hours of sunlight, a trend that continues as October’s average dips further to 259 hours. This rhythmic change invites locals and visitors alike to savor the lingering warmth of the sun before the cooler months set in, making September a delightful time to bask in Chang'an's natural beauty.

Monthly Sunshine Duration in Chang'an: September Highlighted

The September sunshine duration represents the total number of hours Chang'an experiences direct sunlight during the month of September, excluding cloudy or obstructed periods. This chart compares the sunshine duration of September with the other months of the year.
JanFebMarAprMayJunJulAugSepOctNovDec192h232h280h287h299h303h312h271h278h259h223h230h
Data source: Chang'an September Sunshine duration data generated using information from the Copernicus Climate Change Service.

Chance of Sun in Chang'an During September

In September, the likelihood of sunny weather in Chang'an, China, stands at 29%, marking it as one of the lower points in the annual cycle for sunshine. This trend continues from the summer months, notably where the chances in July and August plummet to 21% and 26% respectively. Following this less-than-ideal stretch, conditions begin to improve noticeably in October, jumping to 56%. Interestingly, the early autumn month of September acts as a transitional phase, caught between the heat of summer and the more stable sunshine of autumn. While the skies may not be consistently clear, the gradual shift signals the impending return of brighter days, as Chang'an prepares to greet a more favorable weather pattern in the months ahead.

Percentage of Sunny Days in September in Chang'an

The chart illustrates the percentage of sunny days in Chang'an throughout the year, with September highlighted. It highlights the variation in sunshine across each month and provides an overview of the typical frequency of sunny days, offering insights into how often Chang'an experiences clear skies throughout the year.
JanFebMarAprMayJunJulAugSepOctNovDec60%49%55%50%36%25%21%26%29%56%47%66%
Data source: Chang'an September chance of sun data, generated using information from the Copernicus Climate Change Service.

Daylight Hours in Chang'an in September

As summer gives way to autumn in Chang'an, China, September marks a gentle transition in daylight duration, offering around 12 hours of sunlight. This month bridges the long, vibrant days of summer, peaking at 15 hours in June, and the shorter, cozy daylight of early autumn, as October sees a dip to 11 hours. The trend suggests a gradual decrease in daylight following the summer solstice, with September providing a balanced mix of long sunny days and the crisp beginnings of fall. This rhythm of light and shadow beautifully reflects the changing seasons, inviting residents to relish the warm days before the shorter winter months arrive.

Average Daylight Hours in Chang'an for September

The chart illustrates the variation in daylight duration in Chang'an throughout the year, with September highlighted. It shows the monthly changes in daylight hours, calculated by summing the hours between sunrise and sunset.
JanFebMarAprMayJunJulAugSepOctNovDec9h 23m10h 30m11h 56m13h 24m14h 39m15h 17m14h 58m13h 52m12h 27m11h9h 43m9h 2m
Data source: Chang'an daylight hours, calculated by summing the hours between sunrise and sunset for each day.

September Winds in Chang'an

As September settles over Chang'an, a noticeable trend in wind patterns emerges, marking a transition into the more tranquil months of autumn. With an average wind speed of just 1.8 m/s (4 mph), September experiences the calmest breezes of the year, reflecting a gradual decline from the slightly more blustery summer months. Following the more vigorous winds of early spring and summer, this gentle wind caresses the city, offering a serene backdrop as leaves begin to turn and the air grows crisper. As autumn approaches, the city's atmosphere shifts, inviting residents and visitors alike to savor the beauty of Chang'an in its quieter, wind-kissed glory.

Average September Wind Speed in Chang'an

The chart displays monthly wind speed patterns in Chang'an, with values for each month shown alongside September's data, which is highlighted for easy comparison. It illustrates the average wind speed, offering insights into how September's wind conditions compare to the rest of the year.
JanFebMarAprMayJunJulAugSepOctNovDec2.83.42.72.72.32.12.02.41.8 m/s2.22.83.2
Data source: Chang'an September wind data, generated using information from the Copernicus Climate Change Service.

How September Weather in Chang'an Compares to Other Months

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 mild 1°C (34°F) at night to a warm 29°C (85°F) during the day, averaging around 16°C (61°F). The month experiences considerable rainfall, with 78 mm (3.1 in) over about 9 days and a humidity level of 84%. Conversely, January is marked by significantly colder temperatures, with nighttime lows plummeting to -26°C (-14°F) and daytime highs peaking at just 4°C (39°F), resulting in a chilly average of -11°C (12°F). Precipitation is minimal, only 7 mm (0.3 in) across just 1 day, and humidity is lower at 78%. For more detailed information on January weather in Chang'an, visit Chang'an weather in January.

September and February present starkly contrasting weather conditions. In September, temperatures range from a cool 1°C (34°F) at night to a warm 29°C (85°F) during the day, with an average of 16°C (61°F). The month experiences relatively high humidity at 84% and receives a total precipitation of 78 mm (3.1 in) over approximately 9 days, making it a wetter month. In contrast, February brings much harsher weather, with minimum temperatures diving to -21°C (-6°F) and daytime highs only reaching up to 9°C (49°F), resulting in an average temperature of -8°C (17°F). February is significantly drier, with only 13 mm (0.5 in) of precipitation spread across 3 days, and lower humidity at 75%. For more detailed information, you can check out Chang'an weather in February.

September and March present strikingly different weather characteristics. In September, temperatures range from a cool 1°C (34°F) at night to a warm 29°C (85°F) during the day, with an average of 16°C (61°F). The month sees a higher precipitation level of 78 mm (3.1 in) across about 9 days, accompanied by high humidity at 84%. In contrast, March experiences much colder conditions, with temperatures falling as low as -24°C (-12°F) at night and peaking at 23°C (74°F), averaging just around 1°C (33°F). Precipitation is significantly lower in March at 28 mm (1.1 in) over only 4 days, with humidity at 70%. For those interested in a detailed look at March weather, you can explore Chang'an weather in March.

When comparing the weather in September and April, notable differences emerge in temperature and humidity levels. September typically boasts a milder average temperature of 16°C (61°F), with maximums reaching up to 29°C (85°F), while April experiences cooler conditions with an average of 8°C (46°F) and can spike to a high of 34°C (93°F). Precipitation is more frequent in September, occurring on about 9 days with a total of 78 mm (3.1 in), compared to just 27 mm (1.1 in) over 6 days in April. Additionally, September's humidity is significantly higher at 84%, in contrast to April’s lower humidity level of 65%. For a closer look at April weather specifics, you can visit Chang'an weather in April.

September and May exhibit distinct weather patterns, reflecting the transition between seasons. In September, temperatures range from a minimum of 1°C (34°F) to a maximum of 29°C (85°F), with an average of 16°C (61°F), while May offers a slightly broader temperature range, with a minimum of 0°C (32°F) and a maximum of 35°C (96°F), averaging 14°C (57°F). Both months experience similar precipitation levels, with September seeing 78 mm (3.1 in) over 9 days and May recording 77 mm (3.0 in) across 12 days. However, September's humidity is notably higher at 84%, compared to May's 72%, contributing to a different overall feel in the air. For more detailed insights on the weather in May, visit Chang'an weather in May.

When comparing the weather in September to that of June, notable differences emerge. September experiences a broader temperature range, with minimums dropping to 1°C (34°F) and maximums reaching 29°C (85°F), while June boasts a milder minimum of 7°C (45°F) and can soar up to 34°C (93°F). Both months have similar precipitation levels, with September receiving around 78 mm (3.1 inches) over 9 rainy days compared to June’s 80 mm (3.1 inches) over 13 days. Humidity is fairly consistent, sitting at 84% in September and slightly lower at 82% in June, contributing to a generally humid feel during both months. For a more detailed look, you can check Chang'an weather in June.

In comparing the weather of September and July, we observe notable differences in temperature and precipitation patterns. September experiences milder temperatures, with a minimum of 1°C (34°F) and an average of 16°C (61°F), as opposed to July's warmer conditions, which range from a minimum of 11°C (52°F) to an average of 22°C (72°F). Additionally, July sees higher maximum temperatures peaking at 35°C (96°F), while September's maximum is a more moderate 29°C (85°F). In terms of precipitation, July receives more rain, totaling 101 mm (4.0 in) over 11 days, compared to September's 78 mm (3.1 in) across 9 days. Humidity levels are relatively similar in both months, standing at 84% in September and slightly higher at 87% in July. For more detailed insights, you can check Chang'an weather in July.

In comparing the weather of September to that of August, we see a distinct shift towards cooler temperatures and less precipitation. September experiences a minimum temperature of 1°C (34°F) and an average temperature of 16°C (61°F), significantly lower than August's minimum of 6°C (43°F) and average of 21°C (71°F). Additionally, the maximum temperature in September peaks at 29°C (85°F), which is notably less than August's soaring maximum of 36°C (97°F). Precipitation also decreases in September with 78 mm (3.1 in) of rain over 9 days, contrasting with August's heavier rainfall of 182 mm (7.2 in) over 15 days. Humidity remains relatively high in both months, with September at 84% and August slightly higher at 89%. For a more detailed look at August weather, you can visit Chang'an weather in August.

September and October exhibit notable differences in weather patterns. September experiences a mild average temperature of 16°C (61°F) with a maximum of 29°C (85°F), while October sees a significant drop in average temperature to 8°C (47°F), with a minimum plunging to -6°C (22°F). Rainfall is heavier in September, totaling 78 mm (3.1 in) over 9 days, compared to October's lighter precipitation of 35 mm (1.4 in) across just 6 days. Humidity levels remain relatively stable, with September at 84% and October slightly lower at 83%. For specific insights on October weather, you can refer to Chang'an weather in October.

September and November present a stark contrast in weather conditions. In September, temperatures range from a mild 1°C (34°F) at night to a warm 29°C (85°F) during the day, with an average of 16°C (61°F). The month also experiences higher humidity levels at 84% and notable rainfall, totaling 78 mm (3.1 in) over 9 days. Conversely, November sees a significant drop in temperatures, with a minimum of -15°C (5°F) and a maximum of 16°C (62°F), averaging around -1°C (31°F). Precipitation is less frequent, falling only 36 mm (1.4 in) across 4 days, and the humidity decreases to 67%. For more detailed information, visit Chang'an weather in November.

In September, the weather is characterized by a wide range of temperatures, with minimums around 1°C (34°F) and maximums reaching highs of 29°C (85°F), resulting in an average temperature of 16°C (61°F). This month also sees a fair amount of rain, with 78 mm (3.1 in) of precipitation over approximately 9 days and high humidity at 84%. In stark contrast, December brings a significant drop in temperatures, with minimums plummeting to -26°C (-14°F) and maximums capping at 5°C (41°F), leading to an average of -10°C (15°F). Additionally, December is much drier, with only 10 mm (0.4 in) of precipitation occurring on just 1 day and lower humidity at 70%. For more detailed information, you can check out Chang'an weather in December.

Compare Chang'an's Climate with Cities Worldwide

Conclusion: What to Expect From September Weather in Chang'an

September in Chang'an brings a refreshing shift, as temperatures transition from the summer heat toward the crispness of autumn. With the average humidity at a notable 84%, the air feels invigorating, yet occasional rainfall, totaling 78 mm over 9 days, adds a touch of moisture to the environment. Unlike the blazing summer months, when the heat can be oppressive, September offers a more moderate climate, perfect for outdoor activities. As you plan your visit, explore more about the unique nuances of the region's weather patterns at Chang'an Climate.