Last updated: August 21, 2025
In September, Yunnan, China experiences warm weather characterized by maximum temperatures reaching 35°C (96°F) and an average temperature of 28°C (82°F), creating a pleasing yet humid climate with approximately 75% humidity. As the month progresses, residents and visitors can expect frequent rain, with 18 days experiencing a cumulative precipitation of 136 mm (5.4 in), contributing to the region's lush landscapes. This mix of warmth and moisture not only enhances the vibrant natural scenery but also invites travelers to enjoy a refreshing escape amidst the breathtaking beauty of Yunnan.
In Yunnan, China, September marks the transition into fall, bringing pleasantly mild temperatures that make it a delightful time to visit. With a minimum of 18°C (65°F) and an average of 28°C (82°F), the weather remains warm, yet cooler than the sweltering summer months. As the month progresses, daytime highs can reach up to 35°C (96°F), allowing for plenty of outdoor exploration. This gradual decrease in temperature, compared to the peak summer heat, hints at the approaching autumn, creating a comfortable climate for travelers looking to enjoy the region's stunning landscapes and diverse cultures. The overall trend shows September as a perfect midpoint, balancing warmth with a hint of the crispness that fall brings.
In September, Yunnan experiences a noticeable decrease in precipitation compared to the summer months, with an average of 136 mm (5.4 in) of rain over 18 days. This reduction marks a significant drop from August's 246 mm (9.7 in), signaling a gradual transition towards drier weather as autumn approaches. While September still retains a healthy amount of rainfall, it is a clear contrast to the earlier, more intense rainy season, which peaks in June. As the year progresses into October, precipitation is expected to decline further to 59 mm (2.3 in), indicating a shift toward the region's cooler and drier months, making September a pivotal time for both flora and fauna as they adjust to the changing climate.
In September, the humidity in Yunnan, China, settles at a comfortable 75%, reflecting a gradual decline from the peak levels experienced during the sweltering summer months. After a July and August dominated by intense humidity at 88%, the air begins to lose some of its moisture as it transitions into autumn. This decrease from the late summer highs signifies a shift towards more moderate conditions, making September a month of pleasant weather. The overall trend showcases a seasonal fluctuation, with humidity levels rising steadily from January's 64% moving up to the summer months, before tapering off again into early fall, providing a refreshing change for residents and visitors alike.
As September rolls into Yuannan, China, the UV Index remains notably high at 12, categorizing it as extreme with a burn time of just 10 minutes. This trend follows a summer of intense UV exposure, with the index peaking at 14 in May and 13 in June through August. With a gradual decline expected as October approaches, where the index drops to 10 and the exposure category shifts to very high, September serves as a reminder of the need for sun protection. Anticipating outdoor activities? Be mindful of your exposure, as the intense rays are still impactful. For more details on the UV index throughout the year, visit Yuannan UV Index.
UV Risk Categories
September shines brightly in Yunnan, China, boasting an impressive 280 hours of sunshine that aligns perfectly with the end of summer. This month mirrors the sun-soaked days of August, both offering abundant light and warmth. As the year unfolds, there's a noticeable upward trend in daylight from January’s 209 hours, peaking during the sun-drenched July, where hours reach a remarkable 304. Following the summer peak, sunshine slightly tapers off into October but maintains a robust count, highlighting Yunnan’s reputation as a bastion of sun even as autumn approaches. With such vibrant sunshine, September serves as a beautiful transition, ensuring outdoor enthusiasts and nature lovers bask in the stunning light and invigorating energy of this enchanting region.
September in Yunnan, China, offers a refreshing wave of sunshine as the summer heat wanes, with a 49% chance of sunny weather. This marks a notable increase compared to the dreary summer months of June and August, where the odds dipped significantly to 11% and 15%, respectively. While early spring months like January and February boast higher probabilities of sun, September stands out as a transitional period, bridging the bright days of late summer and the crisp air of autumn. As the region prepares for the cooler months of October and November, which hover around 38% and 63% for clear skies, September emerges as a delightful opportunity to bask in the warmth of the fading season.
In Yunnan, China, September marks a notable transition in daylight duration, continuing the trend set throughout the warmer months. With 12 hours of daylight, September mirrors the length seen in April and August, indicating a stable period just before the daylight hours begin to wane. The year kicks off with shorter days in January, gradually extending as spring approaches, peaking at 13 hours during the lush months of May, June, and July. This gradual ascent and subsequent contraction in daylight create a rhythmic pattern, inviting residents to bask in the sun while the days still linger warmly before giving way to shorter autumn and winter hours. Overall, September serves as a gentle reminder of the changing seasons, making the most of the daylight before the descent into the cozy, shorter days of fall.
As September rolls into Yunnan, China, a distinct shift in wind patterns is evident. With an average wind speed of just 1.2 m/s (3 mph), the breezes become notably calmer compared to the preceding months. This gentle zephyr signifies the transition from the warm summer months, where winds reached up to 2.2 m/s (5 mph), to the upcoming autumn. As the temperature cools, a gradual uptick in wind speed is anticipated in October, with averages returning to 2.8 m/s (6 mph). This trend highlights how the region's wind dynamics ebb and flow throughout the year, creating a unique atmosphere that complements Yunnan's stunning natural beauty.
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 patterns. In September, temperatures range from a minimum of 18°C (65°F) to a scorching maximum of 35°C (96°F), with an average of 28°C (82°F). This month also experiences significant rainfall, totaling 136 mm (5.4 in) over 18 days, paired with high humidity levels of 75%. In contrast, January offers much cooler temperatures, with a minimum of 0°C (33°F) and a maximum of 28°C (82°F), averaging only 14°C (58°F). Precipitation decreases substantially to 33 mm (1.3 in) across just 4 days, along with a lower humidity of 64%. For a more detailed view of January weather, visit Yuannan weather in January.
September and February present strikingly different weather patterns. In September, the climate is notably warmer, with minimum temperatures around 18°C (65°F) and average highs reaching up to 35°C (96°F), alongside high humidity levels of 75%. The month also experiences considerable rainfall, totaling 136 mm (5.4 in) over approximately 18 days. In contrast, February showcases a cooler environment, with minimum temperatures dipping to 2°C (36°F) and an average high of 29°C (85°F). Precipitation is significantly lower at 53 mm (2.1 in) across just 8 days, and the humidity decreases to 68%. For a closer look at February's weather specifics, you can visit Yuannan weather in February.
In comparing the weather between September and March, September tends to be significantly warmer, with average temperatures peaking at 28°C (82°F) and going as high as 35°C (96°F). This month also experiences higher humidity levels at 75% and more frequent rain, averaging 136 mm (5.4 in) over 18 days. In contrast, March is cooler, with average temperatures around 19°C (67°F) and maximums reaching 32°C (89°F). Precipitation is slightly lower in March, totaling 127 mm (5.0 in) over 14 days, and humidity is marginally less at 73%. For more detailed insights, you can check Yuannan weather in March.
In September, the weather tends to be warmer, with average temperatures around 28°C (82°F) compared to April's average of 22°C (72°F). September experiences higher maximum temperatures, peaking at 35°C (96°F), while April's maximum reaches 33°C (92°F). Additionally, September sees more significant rainfall, accumulating 136 mm (5.4 in) over approximately 18 days, compared to April's 122 mm (4.8 in) across 13 days. Humidity levels are also slightly higher in September at 75%, versus April's 71%. For more detailed insights, check out Yuannan weather in April.
In comparing the weather of September and May, we observe notable differences in temperature and precipitation patterns. September typically experiences a minimum temperature of 18°C (65°F) and an average of 28°C (82°F), reaching a maximum of 35°C (96°F). In contrast, May starts slightly cooler with a minimum temperature of 15°C (58°F) and an average of 26°C (79°F), although it can peak at a higher maximum of 36°C (98°F). Precipitation is more pronounced in May, with a total of 177 mm (7.0 in) over 18 days, compared to September's 136 mm (5.4 in) during the same number of days. Humidity levels are similarly high, at 75% in September and 79% in May, contributing to a muggy atmosphere in both months. For a more detailed look at May weather, check out Yuannan weather in May.
When comparing the weather in September and June, both months exhibit similar average temperatures, lingering around 28°C (82°F). However, June tends to be hotter overall, with maximum temperatures reaching up to 37°C (98°F), compared to September's peak of 35°C (96°F). Precipitation is significantly higher in June, with 325 mm (12.8 in) falling over 26 days, while September sees 136 mm (5.4 in) across 18 days. Humidity levels are relatively consistent, with June at 77% and September slightly lower at 75%. For a deeper dive into June's climate specifics, check out Yuannan weather in June.
When comparing the weather in September and July, it is evident that July is typically warmer and more humid. In July, temperatures range from a minimum of 24°C (75°F) to a maximum of 37°C (98°F), with an average of 29°C (84°F). September, on the other hand, sees slightly cooler temperatures, with a minimum of 18°C (65°F), an average of 28°C (82°F), and a maximum of 35°C (96°F).
Precipitation is also more pronounced in July, with 168 mm (6.6 in) of rainfall spread over 22 days, compared to September's 136 mm (5.4 in) over 18 days. The humidity levels reflect this difference as well, with July reaching 88% while September registers at 75%. For a detailed look at Yuannan's climate in July, check out this link: Yuannan weather in July.
When comparing the weather in September to August, September generally experiences slightly cooler temperatures, with a minimum of 18°C compared to August’s warmer minimum of 23°C. Both months have similar average temperatures around 28°C, but August peaks higher with a maximum of 37°C, while September reaches a maximum of 35°C. Additionally, September sees a significant reduction in precipitation, with 136 mm over 18 days, compared to August's much higher 246 mm over 24 days. Humidity levels also decrease slightly in September to 75%, down from August's 88%. For more details on August weather, you can check Yuannan weather in August.
In September, the weather is typically warm, with average temperatures around 28°C (82°F) and a maximum reaching up to 35°C (96°F). This month sees significant rainfall, with precipitation totaling 136 mm (5.4 in) over 18 days and a humidity level of 75%. In contrast, October presents milder conditions with a minimum temperature of 14°C (57°F) and an average of 24°C (75°F), while still peaking at 35°C (95°F). The month experiences considerably less rainfall, with only 59 mm (2.3 in) spread over just 7 days, and a lower humidity level of 65%. For more detailed insights on weather patterns, you can check Yuannan weather in October.
September and November present distinctly different weather patterns. In September, temperatures typically range from a warm minimum of 18°C (65°F) to a scorching maximum of 35°C (96°F), with an average temperature of 28°C (82°F). This month is also characterized by significant precipitation, totaling 136 mm (5.4 in) over 18 days, contributing to a higher humidity level of 75%. In contrast, November sees a much cooler climate with temperatures dipping to a minimum of 10°C (50°F) and peaking at 30°C (87°F), averaging around 20°C (68°F). Precipitation decreases significantly to just 24 mm (0.9 in) over 4 days, and humidity falls to a more comfortable 64%. For a more detailed overview, you can visit Yuannan weather in November.
September offers a warm climate with temperatures ranging from a minimum of 18°C (65°F) to a scorching maximum of 35°C (96°F), averaging around 28°C (82°F). The month is marked by high humidity at 75% and significant precipitation, with 136 mm (5.4 in) spread across 18 rainy days. In stark contrast, December brings much cooler temperatures, with a minimum of 4°C (39°F) and an average of 15°C (59°F), reaching a maximum of 29°C (84°F). The rainfall in December is significantly lower, totaling only 19 mm (0.8 in) over just 4 days, and the humidity decreases slightly to 69%. For more details, check out Yuannan weather in December.
As September unfolds in Yuannan, the weather marks a transition that distinctly contrasts with the peak of summer. With temperatures edging up to a maximum of 35°C but averaging around 28°C, the month tends to be warmer yet more temperate than the extreme heat of July and August. Coupled with 75% humidity, the air feels both tropical and heavy, prompting a notable increase in precipitation over 18 days, totaling 136 mm. This shift not only brings a refreshing change but also prepares the landscape for the lush beauty of autumn. For those looking to explore the unique characteristics of Yuannan's climate, you can find more information here: Yuannan Climate.