Last updated: August 21, 2025
In September, Yunnan, China experiences a diverse range of temperatures, with a striking maximum reaching 37°C (99°F) and an average temperature of 26°C (79°F), allowing for warm, pleasant days. As the season transitions, nighttime brings a refreshing minimum of 16°C (62°F). Rainfall is fairly frequent, with 12 days recording precipitation, totaling approximately 80 mm (3.1 in) for the month. With an average humidity level of 62%, visitors can anticipate a mix of warm weather and occasional rain, making it a dynamic time to explore the region's vibrant landscapes.
As September arrives in Yunnan, China, the lingering warmth of summer begins to soften, yet temperatures remain pleasantly mild. With minimums around 16°C (62°F) and an average reaching 26°C (79°F), September showcases a delightful balance between comfort and warmth. The high temperatures can still peak at 37°C (99°F), reminiscent of August's heat, but a slight cooling trend sets the stage for autumn’s embrace. This transition from the sweltering summer months to more temperate conditions marks September as a perfect time for outdoor adventures, where one can enjoy the lush scenery without the intensity of peak summer heat. Overall, September in Yunnan is a month where the warmth is tempered with gentle breezes, inviting both locals and visitors to savor the outdoor beauty.
In September, Yunnan, China, experiences a noticeable decline in precipitation, with rainfall measuring 80 mm (3.1 in) over approximately 12 days. This reduction follows the peak of the wet season, characterized by heavy rainfall in May and June, which often reach the highest monthly totals of 260 mm and 322 mm, respectively. As the region transitions into autumn, the rainfall tapers off significantly compared to the summer months. Interestingly, while September sees a decrease in precipitation, the consistent rainfall throughout the previous months prepares the landscape for a gradual cooling and a lush, vibrant fall. This shift not only marks the end of the heaviest rainfalls but also hints at the upcoming dry season in October, where precipitation further drops to 40 mm.
In September, humidity in Yunnan, China, dips to 62%, marking a refreshing transition as the summer heat wanes. This decrease follows a peak in the sweltering months of July and August, where humidity levels soared to 89% and 86%, respectively. The trend throughout the year shows a steady increase from January through August, reaching its highest point during the summer, before finally retreating in September and October to match winter's early crispness. As the year progresses, the humidity rises in early months, peaking during the summer months, only to gracefully decline, setting the stage for a more temperate autumn.
In September, Yunnan, China, sees a UV Index of 11, categorizing it as extreme and requiring caution for outdoor activities. As the summer months transition into autumn, the UV levels slightly decrease from the peak observed in July, yet still demand vigilance since the burn time remains a short 10 minutes. This trend reflects the region's overall high UV exposure throughout the year, peaking in the summer with indices soaring to 13 in July. It's essential to stay informed and protected, especially in September, as the intensity of sunlight remains significant. For further details on the UV Index throughout the year, check out Yuannan UV Index.
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September in Yunnan, China, offers a delightful blend of warm days and ample sunshine, with an impressive 263 hours of sunlight—the second highest for the month. This follows the peak summer months of July and August, which bask in 293 and 316 hours respectively, creating a vibrant atmosphere perfect for outdoor adventures. As the year progresses, sunlight hours gradually decrease after September, leading into the milder days of October with 197 hours. Overall, the sunlight trend showcases a distinct shift from the lengthy summer days to the cozy fall ambiance, making September a cherished month for visitors and locals alike to embrace the region's natural beauty.
As September arrives in Yunnan, China, the likelihood of sunny weather significantly increases, boasting a promising 65% chance of sunshine. This notable upswing follows a summer of lower probabilities, where peak months like June and July struggled to reach even 40%. In contrast to the spring transition, marked by notably low sunshine rates—dipping as low as 14% in April—September emerges as a beacon of brightness, setting the tone for the approaching autumn months. With this favorable forecast, travelers and locals alike can look forward to enjoying the natural beauty and outdoor activities that Yunnan has to offer in this vibrant early fall month.
As summer fades in Yunnan, China, September ushers in a notable shift in daylight duration, offering approximately 12 hours of sunlight. This marks a gradual transition from the peak of summer, where daylight lingers for up to 13 hours from May through August. Following the vibrant days of summer, daylight steadily declines into the cooler months, reaching 11 hours in October before settling back to 10 hours in November and December. This gentle ebb of light hints at the approaching winter, yet still provides ample opportunity to bask in the lingering warmth of late summer days.
In September, Yunnan, China experiences a gentle breeze with an average wind speed of 1.6 m/s (3 mph), reflecting a return to the calmer conditions typical of late summer. This marks a subtle shift from the more dynamic winds of July, which peak at 2.0 m/s (5 mph), and the declining gusts of August. The consistency of wind speeds across the months shows a pattern, with January through April generally remaining subdued, hovering around 1.6 to 1.8 m/s. As autumn sets in, October witnesses a slight uptick to 1.9 m/s (4 mph), hinting at the transitional nature of the season. Thus, September stands as a serene moment in Yunnan’s climatic rhythm—a time when the air carries the promise of change, yet remains tranquil enough to savor the lingering warmth of summer.
Weather in Yuannan varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in Yuannan, focusing on differences in temperature, rainfall, humidity, and UV levels.
September and January showcase stark contrasts in weather. In September, temperatures range from a mild 16°C (62°F) to a scorching maximum of 37°C (99°F), averaging around 26°C (79°F). The month also experiences considerable humidity at 62%, along with 80 mm (3.1 in) of precipitation over 12 days. In contrast, January brings a much colder climate, with temperatures dipping as low as -4°C (25°F) and peaking at 22°C (72°F), averaging a frigid 7°C (45°F). Precipitation decreases to 49 mm (1.9 in) over just 8 days, while humidity rises slightly to 65%. For more detailed weather information on January, visit Yuannan weather in January.
September and February present contrasting weather patterns. In September, temperatures range from a minimum of 16°C (62°F) to a maximum of 37°C (99°F), with an average temperature of 26°C (79°F). The month experiences 80mm of precipitation over 12 days, accompanied by a humidity level of 62%. In stark contrast, February showcases much colder weather, with temperatures dipping to a minimum of -3°C (27°F) and peaking at 26°C (80°F), averaging only 9°C (48°F). Similar to September, February also sees 80mm of precipitation but maintains a slightly higher humidity of 69%. For more details on February weather, you can visit Yuannan weather in February.
September and March present distinct weather contrasts. September typically enjoys warmer temperatures, with averages around 26°C (79°F), peaking at a high of 37°C (99°F). However, it also experiences moderate rainfall, accumulating about 80 mm over approximately 12 days, with humidity levels hovering around 62%. In contrast, March is notably cooler, with average temperatures of 14°C (57°F) and maximum highs reaching 30°C (86°F). It also sees significantly more precipitation, totaling 192 mm over roughly 20 days, accompanied by a higher humidity of 81%. For a detailed look at the weather patterns in March, you can refer to Yuannan weather in March.
When comparing the weather in September and April, notable differences emerge in temperature and precipitation patterns. September typically enjoys warmer temperatures, with a minimum of 16°C (62°F) and an average high of 37°C (99°F), creating a generally more summery feel. In contrast, April has cooler temperatures, ranging from a minimum of 6°C (44°F) to a maximum of 33°C (91°F), marking a transition into spring.
Precipitation is another significant factor, as April experiences higher rainfall with 182 mm (7.2 in) over 18 days, compared to September's 80 mm (3.1 in) over 12 days. Additionally, April's humidity is slightly higher at 82%, compared to September's 62%, which may contribute to a more muggy atmosphere. For more detailed information, check out Yuannan weather in April.
September and May offer distinct weather experiences, with May typically being wetter and more humid. In September, temperatures range from a minimum of 16°C (62°F) to a maximum of 37°C (99°F), with an average of 26°C (79°F) and precipitation reaching 80 mm (3.1 in) over 12 days. In contrast, May has cooler temperatures, with a minimum of 11°C (51°F) and a maximum of 36°C (96°F), averaging 23°C (73°F). However, it sees a significant increase in rainfall, totaling 260 mm (10.3 in) over 19 days, contributing to a higher humidity level of 86%. For a more detailed look at the weather in May, check out Yuannan weather in May.
In comparing September and June weather, both months exhibit similar average temperatures, hovering around 26°C (79°F), with June slightly warmer at a minimum of 17°C (64°F) compared to September's 16°C (62°F). However, June brings significantly more rainfall, with a total precipitation of 322 mm (12.7 in) over 20 days, while September sees a much lighter 80 mm (3.1 in) over just 12 days. Additionally, humidity levels are higher in June at 86%, compared to September's 62%. For more detailed insights, you can refer to Yuannan weather in June.
In comparing the weather between September and July, September tends to be slightly cooler, with minimum temperatures around 16°C (62°F) and average highs of 26°C (79°F), while July experiences warmer temperatures, with minimums at 20°C (69°F) and averages of 29°C (84°F). July also features a higher maximum temperature of 38°C (100°F) compared to September's peak of 37°C (99°F). Additionally, July is characterized by significantly more rainfall, with a total of 224 mm (8.8 in) over 14 days, while September sees only 80 mm (3.1 in) across 12 days. The humidity levels are higher in July at 89%, compared to September's 62%, making July feel more humid and oppressively warm. For more detailed information, you can check Yuannan weather in July.
In comparing the weather patterns of September and August, it's evident that September experiences slightly cooler temperatures overall, with a minimum of 16°C (62°F) and an average of 26°C (79°F), compared to August's warmer minimum of 22°C (72°F) and average of 29°C (84°F). Both months have the same maximum temperature of 37°C (99°F), but August sees more humidity at 86%, compared to September’s 62%. Additionally, September has less precipitation with 80 mm (3.1 in) over 12 days compared to August's 110 mm (4.3 in) over 14 days. This can lead to a more comfortable feel in September, especially for those looking to avoid the heavier summer rains. For more details on the weather in August, you can check Yuannan weather in August.
In September, the weather is notably warmer, with average temperatures around 26°C (79°F) and highs reaching up to 37°C (99°F). This month also experiences higher precipitation, totaling 80 mm (3.1 in) over 12 rainy days. In contrast, October sees a significant drop in temperatures, averaging 19°C (67°F) with a minimum of 9°C (49°F) and a maximum of 36°C (97°F). Rainfall decreases to 40 mm (1.6 in), falling over just 8 days, while humidity remains consistent at 62%. For more detailed insights on the weather in October, you can check out Yuannan weather in October.
In September, the weather is warm with average temperatures reaching 26°C (79°F) and highs soaring up to 37°C (99°F), making it a hot and humid month with a humidity level of 62%. The month is also marked by considerable rainfall, with about 80 mm (3.1 in) of precipitation spread over 12 days. In contrast, November brings a cooler climate, with average temperatures dropping to 14°C (58°F) and a maximum of 29°C (85°F). Although the total precipitation decreases slightly to 67 mm (2.6 in) over 9 days, the humidity rises to 71%, giving an entirely different feel to the month. For more details on the weather specifics, check out Yuannan weather in November.
September and December present contrasting weather experiences. In September, temperatures range significantly from a minimum of 16°C (62°F) to a maximum of 37°C (99°F), with an average of 26°C (79°F), creating a warm and humid environment, marked by 80 mm (3.1 in) of precipitation over 12 days. In contrast, December features much cooler temperatures, with a minimum of -2°C (29°F) and an average of 9°C (48°F), peaking at 23°C (74°F). The month also sees less rainfall, totaling 51 mm (2.0 in) over 9 days, though humidity is slightly higher at 75%. For more detailed insights on December weather in this region, check Yuannan weather in December.
As September unfolds in Yuannan, it brings a unique blend of warmth and moisture that sets it apart from the cooler months preceding it. The average temperature hovers comfortably around 26°C, providing a pleasant reprieve from the summer heat, although brief periods of soaring temperatures can still reach as high as 37°C. Rainfall becomes more pronounced, with about 12 days of precipitation contributing to a total of 80 mm, creating a humid atmosphere that encourages lush greenery. This combination of warmth and increased humidity shapes September into a transitional month, making it ideal for enjoying the vibrant outdoor scenery. For a deeper dive into the weather patterns of Yuannan, check out Yuannan Climate.