Last updated: August 21, 2025
In September, Chang'an, China, experiences a vibrant transition into autumn, characterized by a maximum temperature of 37°C (99°F) and a comfortable average of 25°C (77°F). The days can start warm, with minimum temperatures dropping to around 17°C (62°F) at night. This month sees 128 mm (5.0 in) of rainfall spread across 11 days, making it one of the wetter periods of the year. With a humidity level of 66%, visitors can expect a muggy atmosphere, particularly during rain showers. Overall, September offers a dynamic climate perfect for exploring Chang'an's rich history and stunning scenery.
In September, Chang'an, China experiences a delightful transition as summer begins to fade, with temperatures that reflect a warm yet comfortable climate. The month starts with a minimum of 17°C (62°F), rising to an average of 25°C (77°F), and peaking at around 37°C (99°F). This signifies a notable cooling from the sweltering heights of summer, while still offering plenty of warmth for outdoor activities. As the month progresses, the days become increasingly crisp, hinting at the arrival of autumn. The gradual decline in temperatures compared to August's heat shows a steady shift, enticing visitors to enjoy the vibrant scenery and rich cultural experiences before the cooler months set in.
September in Chang'an, China, marks a notable transition in precipitation patterns as the summer rains begin to wane. With an average rainfall of 128 mm (5.0 in) over 11 days, this month experiences a decrease compared to the peak precipitation of the preceding months like May and June. The shift from the high summer totals is evident as September's rainfall paves the way for the drier autumn months. While still significant, the downward trend indicates a gradual move towards the cooler, less humid days ahead, setting the stage for October's further dip to 59 mm (2.3 in). This gradual decline reflects the dynamic climate of Chang'an, where each month brings its own rhythm of rain and dryness.
In September, Chang'an experiences a notable decline in humidity, dropping to 66%—its lowest level since spring. This shift marks a significant transition from the muggy summer months, where humidity peaked at 89% in July. Following the consistently high levels of moisture from March to August, September's drier climate offers a refreshing contrast, hinting at the approaching onset of autumn. As the year progresses, humidity levels gradually rise again in October, suggesting that Chang'an's weather follows a rhythmic pattern, oscillating between humid summers and more comfortable autumn months.
As September approaches in Chang'an, China, residents can expect a very high UV Index of 10, demanding cautious sun exposure with a burn time of just 15 minutes. This slight dip from the extreme levels seen during the height of summer indicates a transition into autumn, though sun protection remains vital. Comparatively, the spring months featured similar high UV levels, peaking at 10, showing that both seasons require vigilance against harmful rays. As temperatures cool and days shorten, the UV Index will gradually decrease leading into October, but for now, September still commands respect for the sun. For more detailed information, visit Chang'an UV Index.
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In September, Chang'an basks in an impressive 257 hours of sunshine, marking a delightful transition from the summer peak while still enjoying significant daylight. This month, while experiencing fewer sunny hours than the lively summer months of July and August, remains bright and inviting. A glance at the yearly trend reveals a steady increase from the winter's initial 152 hours in January through the vibrant blooms of May and June. However, as autumn settles in, sunlight begins to taper off gently, with October anticipated to bring 210 hours. This rhythmic dance of sunlight not only enriches the natural beauty of Chang'an but also contributes to the lively cultural and social atmosphere as the city prepares for the cooler months ahead.
In September, the likelihood of sunny weather in Chang'an, China sees a significant rise, reaching an impressive 65% chance of sunshine. This marks a notable increase compared to the preceding months, where the probability of clear skies remained below 40%. As summer transitions into autumn, September stands out as one of the brightest months, ushering in a welcome shift that allows for more outdoor activities under the sun. This trend of increasing sunshine continues into October, but notably, the peak in September highlights a period of vibrant weather that residents and visitors alike can relish.
As September unfolds in Chang'an, China, the daylight begins its gentle retreat, offering about 12 hours of sunlight. This month marks a transition from the peak of summer, where the days lingered under the sun for 13 hours, back towards the shorter daylight of autumn. The trend reveals a gradual shift: the days lengthen from the 10 hours in January to a summer peak and then gracefully taper off towards October's 11 hours. This ebb and flow of daylight not only influences the natural rhythm of life in Chang'an but also paints a portrait of the changing seasons, inviting residents and visitors alike to embrace the comforting glow of longer evenings as autumn approaches.
In September, the winds in Chang'an, China continue to whisper the tales of transitioning seasons, with an average speed of 2.2 m/s (5 mph). This month marks a slight dip from the breezier summer months, which saw winds peak at 2.6 m/s in July. As the city gears up for fall, the wind begins to gains momentum, setting the stage for October’s brisk 3.1 m/s (7 mph) gusts. The gentle breezes of early autumn provide a refreshing backdrop as the vibrant scenery shifts, echoing the rhythmic cycles of nature in this historic locale. Observing these subtle changes in wind can serve as a reminder of the passage of time and the beauty of seasonal transformation.
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 starkly contrasting weather conditions. In September, temperatures soar with a minimum of 17°C (62°F) and an average high reaching 37°C (99°F), accompanied by significant humidity at 66%. Rainfall is fairly common, with precipitation occurring on 11 days, totaling 128 mm (5.0 in). In contrast, January brings a dramatic drop in temperatures, with lows plummeting to -7°C (20°F) and an average high of only 19°C (66°F). The month experiences less rainfall, amounting to 62 mm (2.5 in) over 8 days, and slightly higher humidity at 69%. For a more detailed overview, you can check Chang'an weather in January.
September and February present strikingly different weather conditions. In September, temperatures range from a mild 17°C (62°F) at night to a scorching 37°C (99°F) during the day, with an average of 25°C (77°F). The month experiences a notable amount of precipitation, totaling 128 mm (5.0 in) over 11 days, coupled with a humidity level of 66%. In contrast, February offers a much cooler climate, with temperatures plummeting to a minimum of -4°C (25°F) and peaking at a comfortable 26°C (79°F), averaging around 7°C (46°F). This month sees less rainfall, accumulating 88 mm (3.5 in) across 12 days, and slightly higher humidity at 71%. For detailed weather insights in February, you can visit Chang'an weather in February.
In comparing the weather of September and March, we observe distinct differences in temperature and humidity. September boasts warmer temperatures, with a minimum of 17°C (62°F) and an average of 25°C (77°F), peaking at a scorching 37°C (99°F). In contrast, March presents much cooler conditions, featuring a minimum of just 3°C (38°F) and an average of 13°C (56°F), with a maximum of 29°C (84°F).
Precipitation is also notable in both months; September receives 128 mm (5.0 in) over 11 days, while March sees a slightly higher total of 156 mm (6.1 in) across 16 days. Humidity levels are elevated in March at 83%, compared to September's 66%, indicating a much more humid early spring. For a more detailed look at March weather, you can visit Chang'an weather in March.
In September, the weather tends to be warmer with average temperatures reaching around 25°C (77°F), and maximum highs can soar to 37°C (99°F). The month experiences about 128 mm (5.0 in) of precipitation over 11 days, with a humidity level of 66%. In contrast, April has cooler temperatures, averaging 18°C (64°F), with a minimum of 6°C (43°F) and maximums reaching 33°C (91°F). This month is also wetter, receiving approximately 169 mm (6.7 in) of rainfall across 14 days and exhibiting higher humidity levels at 86%. For further details on April climate specifics, you can check Chang'an weather in April.
In September, temperatures typically range from a minimum of 17°C (62°F) to a maximum of 37°C (99°F), averaging around 25°C (77°F). This month sees a humidity level of 66% and experiences about 128 mm (5.0 in) of precipitation over approximately 11 days. In contrast, May presents slightly cooler temperatures, with a minimum of 12°C (54°F) and a maximum of 34°C (93°F), averaging 22°C (73°F). However, it is characterized by higher humidity at 85% and more substantial rainfall, totaling 237 mm (9.3 in) over 15 days. The weather in May can be particularly challenging due to the increased precipitation and humidity. For more detailed insights, check out Chang'an weather in May.
In comparing the weather of September and June, we see significant differences in both temperature and precipitation. September experiences a minimum temperature of 17°C (62°F) and an average high of 37°C (99°F), providing some hot days to enjoy. In contrast, June has a similar minimum temperature of 17°C (63°F) but a slightly lower average maximum of 35°C (95°F). Precipitation levels are notably higher in June, with 226 mm (8.9 in) falling over 17 days compared to September's 128 mm (5.0 in) over just 11 days. Furthermore, June is characterized by higher humidity at 85%, compared to September's more comfortable 66%. For more details, check out Chang'an weather in June.
In comparing the weather between September and July, we see notable differences in temperature and precipitation levels. September experiences a minimum temperature of 17°C (62°F) and an average of 25°C (77°F), making it cooler than July, which has a minimum of 22°C (71°F) and an average of 29°C (84°F). July also reaches higher maximum temperatures, peaking at 39°C (103°F), compared to September's maximum of 37°C (99°F). Additionally, rainfall is more significant in July, with 224 mm (8.8 in) over 14 days, compared to September's 128 mm (5.0 in) over 11 days. The humidity is also higher in July at 89%, while September has a humidity level of 66%. For more details, visit Chang'an weather in July.
In September, the weather begins to cool down slightly compared to August, with minimum temperatures dropping from 20°C (68°F) to 17°C (62°F) and average temperatures decreasing from 29°C (85°F) to 25°C (77°F). Although September has a slightly lower maximum temperature of 37°C (99°F) compared to August's peak of 38°C (100°F), it experiences less humidity, averaging 66% compared to 85% in August. Additionally, September has reduced precipitation at 128 mm (5.0 in) over 11 days, while August sees 158 mm (6.2 in) across 14 rainy days. For a more detailed look at August weather, you can check Chang'an weather in August.
September and October exhibit noticeable contrasts in weather patterns. September experiences warmer temperatures with a minimum of 17°C (62°F) and an average high of 37°C (99°F), while October cools down significantly, with a minimum of 10°C (50°F) and an average of 18°C (65°F). In terms of precipitation, September is wetter, receiving 128 mm (5.0 in) over 11 days compared to October's 59 mm (2.3 in) over 9 days. Humidity is slightly higher in October at 68%, compared to September's 66%. For more detailed insights on October weather, you can check Chang'an weather in October.
September and November exhibit stark differences in weather conditions. In September, temperatures soar with a minimum of 17°C (62°F) and can reach a maximum of 37°C (99°F), averaging around 25°C (77°F). This month also sees significant rainfall, totaling 128 mm (5.0 in) over about 11 days, along with a humidity level of 66%. In contrast, November experiences a notable drop in temperature, with a minimum of 3°C (37°F) and a maximum of 26°C (80°F), averaging only 13°C (57°F). The precipitation in November is lighter at 55 mm (2.2 in) across 8 days, accompanied by increased humidity at 77%. For a more detailed look at November’s weather patterns, you can visit Chang'an weather in November.
In September, the weather is typically warm, with average temperatures ranging from a minimum of 17°C (62°F) to a maximum of 37°C (99°F). The month experiences considerable rainfall, averaging 128 mm (5.0 in) over about 11 days, and the humidity sits at 66%. In contrast, December brings a significant drop in temperature, with averages ranging from -4°C (25°F) to a mild 19°C (66°F). Precipitation decreases notably to 37 mm (1.5 in) over just 7 days, and the humidity rises slightly to 78%. For a detailed look at December weather in Chang'an, you can refer to Chang'an weather in December.
As September unfolds in Chang'an, a noticeable shift from the scorching summer months occurs, bringing a more temperate atmosphere ideal for outdoor activities. With average temperatures settling comfortably around 25°C (77°F), mornings and evenings become pleasantly cool, contrasting with the peak heat of July and August. Rainfall begins to make its presence felt, averaging 128 mm across about 11 days, adding a fresh vibrancy to the landscape. While humidity levels remain moderately high at 66%, the cooler temperatures and occasional rain create a more bearable climate. This transitional month offers a beautiful blend of summer's warmth and autumn's promise. For more detailed insights into the weather patterns of this region, visit Chang'an Climate.