Last updated: August 21, 2025
September in Beijing offers a dynamic weather experience, where temperatures can soar to a maximum of 36°C (98°F), providing plenty of warmth, while the average temperature sits comfortably at 22°C (72°F). As the month progresses, evenings can be cooler, with minimum temperatures dipping to 8°C (47°F). Rainfall is moderate, with an average precipitation amount of 63 mm (2.5 in) spread over approximately 5 days, contributing to the crisp autumn air. With humidity levels around 66%, the weather can feel fairly muggy, particularly during the warmer days. Overall, September marks a transition into fall, offering a blend of late-summer heat and refreshing breezes.
As September unfolds in Beijing, a noticeable shift in temperatures heralds the arrival of autumn. With minimums hovering around 8°C (47°F) and averaging 22°C (72°F), the city enjoys a mild climate that invites locals and tourists alike to explore its vibrant streets. The maximum temperature can reach up to 36°C (98°F), making it a transitional month where the lingering warmth of summer meets the crispness of fall. This blend creates a perfect opportunity to partake in outdoor activities, as clear skies and pleasant afternoons become the norm. As the month progresses, the cooler nights hint at the approaching chill of October, but for now, September offers the ideal balance of warmth and comfort.
In September, Beijing experiences a notable transition in its rainfall patterns, receiving 63 mm (2.5 in) of precipitation over the month, spread across 5 rainy days. This significant amount marks a decline from the intense summer rains, with July peaking at 202 mm (8.0 in) and August following closely at 128 mm (5.0 in). As the city shifts from the peak of the wet season, September serves as a bridge into the drier autumn months, setting the stage for October's expected precipitation decrease to 31 mm (1.2 in). Overall, the decrease in both the volume and frequency of rainfall highlights the end of the monsoon-like conditions that dominate Beijing’s summer, ushering in a period of cooler and more stable weather.
September in Beijing reveals a notable shift in humidity, as it settles at 66%, representing a slight dip from the sweltering heights of 78% seen in the preceding months of July and August. This decrease marks a transition towards the drier fall season, reflecting trends from the summer months where humidity levels were consistently high. However, September retains a level of moisture that is still significantly higher than the winter months, which typically hover around 40%. As the city prepares for October's average of 70%, the gradual decline in humidity serves as a reminder of the seasonal changes ahead, ushering in a crisper and more refreshing atmosphere.
As summer transitions to autumn in September, Beijing experiences a drop in the UV Index to 7, placing it in the high exposure category. This is a noteworthy shift from the peak summer months, where the index reached a maximum of 10 in July. With a burn time of just 25 minutes, the need for sun protection remains crucial, despite the slight alleviation in UV intensity compared to the previous months. This trend of decreasing UV levels continues into October, where the index reduces further to 6. As you enjoy the cooler days of September, be mindful to protect your skin during those sunlit hours. For more detailed insights, visit Beijing UV Index.
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In September, Beijing basks in a delightful 279 hours of sunshine, marking a gradual decline from the sun-drenched peak of 326 hours in May. As summer transitions to autumn, this decrease in daylight mirrors a broader trend throughout the year: hours of sunshine tend to peak in late spring and early summer before settling into a more moderate rhythm. While still brighter than the winter months, September’s light offers a gentle warmth, inviting residents and visitors alike to enjoy the city's vibrant parks and historical sites before the cooler temperatures set in. The shift in sunlight not only enhances the city's stunning fall foliage but also signals a time of reflection and preparation for the cozy months ahead.
In September, Beijing's likelihood of sunny weather stands at a moderate 42%, reflecting a transition towards the drier autumn months. This figure follows a summer of diminishing sunshine, where peaks in July dip the chances significantly to 30%. However, as the scorching heat of the summer recedes, September marks a recovery that leads to October's more favorable 60% likelihood of sun. Overall, the sun's presence is on the rise in this month, hinting at the beautiful autumn days ahead while still being somewhat overshadowed by the lingering humidity of summer.
As summer fades into autumn, September in Beijing witnesses a gradual decline in daylight, offering around 12 hours of sunshine each day. This month marks a subtle transition from the prolific sunlight of July and August, when the city basked in a generous 14 hours of daylight. The trend continues as daylight decreases further into the cooler months of October and November, both slipping down to 11 hours and 9 hours respectively. Throughout the year, daylight duration showcases a rhythmic ebb and flow, with the longest days occurring in late spring and summer, while the winter months bring shorter days. This natural cycle not only influences daily life but also paints a vivid picture of the changing seasons in this vibrant metropolis.
As September arrives in Beijing, the wind begins to whisper the transition from the sweltering summer to the cooler autumn months. With an average wind speed of 1.7 m/s (4 mph), the breeze is gentle and subdued, a notable dip compared to the preceding months of May through July, which experienced stronger gusts. July and August saw a low of 1.6 m/s (4 mph) and 1.8 m/s (4 mph)**, respectively, making September one of the calmer months in terms of wind. This slight uptick from August indicates a subtle shift, hinting at the approaching seasonal changes. As the city starts to embrace the crispness of autumn, the serene winds are a reminder of the tranquil beauty that is characteristic of Beijing in September.
Weather in Beijing varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in Beijing, focusing on differences in temperature, rainfall, humidity, and UV levels.
September and January present starkly contrasting weather patterns. In September, temperatures soar, with averages around 22°C (72°F) and highs reaching up to 36°C (98°F), accompanied by a moderate level of humidity at 66%. This month experiences about 63 mm (2.5 in) of rainfall spread over five days, making it a relatively wet period. In contrast, January is characterized by frigid temperatures, with minimums plummeting to -19°C (-2°F) and an average of only -4°C (26°F). This winter month remains dry, recording just 1 mm (0.0 in) of precipitation over zero days and a lower humidity level of 40%. For more detailed insights on January conditions, visit Beijing weather in January.
September and February present stark contrasts in weather. September enjoys warm temperatures, with a minimum of 8°C (47°F) and an average high of 36°C (98°F), alongside a moderate humidity level of 66%. Precipitation is relatively higher during this month, averaging 63 mm (2.5 in) over about 5 days. In contrast, February is characterized by much colder conditions, featuring a minimum temperature of -12°C (10°F) and an average of 0°C (31°F), while reaching a maximum of 23°C (74°F). Precipitation is minimal, with only 7 mm (0.3 in) expected over just a single day, and lower humidity at 41%. For more detailed insights, you can check Beijing weather in February.
In comparing the weather between September and March, September boasts warmer temperatures with a pleasant average of 22°C (72°F) and maximum highs reaching up to 36°C (98°F). However, it also sees higher humidity at 66% and more precipitation, totaling 63 mm (2.5 in) over about 5 days. In contrast, March experiences much cooler weather, with an average temperature of only 8°C (46°F) and minimum lows plunging to -6°C (21°F). This month has relatively low precipitation at 15 mm (0.6 in) across just 3 days, along with lower humidity levels at 48%. For more detailed insights on weather during this month, you can check Beijing weather in March.
When comparing the weather in September and April, we see distinct differences in temperature and precipitation. September enjoys warmer temperatures, with a minimum of 8°C (47°F) and an average high of 36°C (98°F), while April starts off quite cool with a minimum of -2°C (29°F) and an average high of 35°C (95°F). September also experiences more rainfall, averaging 63 mm (2.5 in) over about 5 days, compared to April's lighter precipitation of 19 mm (0.8 in) spread over just 2 days. Humidity levels are relatively similar, with September at 66% and April at 61%. For more details on April weather, check out Beijing weather in April.
When comparing the weather in September and May, both months feature an average temperature of 22°C (72°F), creating a similar overall feel. However, September reaches higher peaks, with maximum temperatures soaring up to 36°C (98°F), while May can escalate even further to 39°C (103°F). In terms of precipitation, September is significantly wetter, with 63 mm (2.5 in) over 5 days, compared to May's light 19 mm (0.7 in) spread across 4 days. Additionally, September has a higher humidity level at 66%, versus May's more comfortable 58%. For more detailed insights into May weather, you can visit Beijing weather in May.
In comparing the weather of September and June, we notice some notable differences and similarities. September typically experiences lower minimum temperatures, averaging at 8°C (47°F) compared to June's minimum of 13°C (55°F). However, June boasts a higher average temperature of 27°C (81°F) versus September's 22°C (72°F). When it comes to maximum temperatures, June can reach up to 42°C (107°F), while September's peak is a more moderate 36°C (98°F). Precipitation is slightly higher in September, with 63 mm (2.5 in) over 5 days, compared to June's 43 mm (1.7 in) over 7 days. Humidity levels are quite similar, with September at 66% and June at 64%. For more details on June weather specifically, you can check Beijing weather in June.
September in Beijing experiences a notable shift in weather compared to the sweltering heat of July. The average temperature in September hovers around 22°C (72°F), with a maximum reaching 36°C (98°F), significantly lower than July's average of 27°C (82°F) and peak of 40°C (105°F). Additionally, September sees a decrease in humidity to 66%, making the air feel more comfortable than July's higher humidity levels at 78%. While September receives 63 mm (2.5 in) of rain over just 5 days, July is much wetter, with 202 mm (8.0 in) falling over 14 days. For a more detailed look at July's climate conditions, visit Beijing weather in July.
When comparing the weather in September to that of August, a noticeable shift in temperature and precipitation occurs. September's temperatures range from a minimum of 8°C (47°F) to a maximum of 36°C (98°F), with an average of 22°C (72°F). In contrast, August tends to be warmer, with temperatures varying from a minimum of 15°C (59°F) to a maximum of 38°C (101°F), averaging at 26°C (79°F). Precipitation also differs significantly; September experiences 63 mm (2.5 in) over 5 days, while August sees a much higher total of 128 mm (5.0 in) over 11 days, indicating a wetter month. Additionally, August has a higher humidity level at 78%, compared to September's 66%. For more details on the weather patterns in August, check out Beijing weather in August.
September and October exhibit notable differences in weather patterns. In September, temperatures range from a minimum of 8°C (47°F) to a maximum of 36°C (98°F), with an average of 22°C (72°F), while October sees a significant drop, with temperatures ranging from -1°C (31°F) to a maximum of 32°C (90°F) and an average of just 13°C (56°F). Precipitation also varies, with September experiencing 63 mm (2.5 in) over 5 days, compared to October's 31 mm (1.2 in) over just 3 days. Humidity increases slightly from 66% in September to 70% in October, contributing to the cooler and more stable conditions of the latter month. For more detailed insights, visit Beijing weather in October.
September and November exhibit starkly different weather patterns. September boasts a mild average temperature of 22°C (72°F), with highs reaching up to 36°C (98°F) and relatively high humidity at 66%. In contrast, November brings a noticeable chill, featuring an average temperature of just 5°C (41°F), with minimum temperatures plunging to -9°C (16°F). Precipitation decreases significantly in November, dropping to 14 mm (0.6 in) over only 2 days compared to September's 63 mm (2.5 in) spread across 5 days. For more information on November weather in Beijing, you can visit Beijing weather in November.
The weather in September presents a warm contrast to December, featuring a temperature range from a mild 8°C (47°F) to a sweltering 36°C (98°F) with an average of 22°C (72°F). In this month, precipitation occurs on about five days, accumulating to 63 mm (2.5 in) and maintaining a relative humidity of 66%. In stark contrast, December experiences much colder conditions, with temperatures dipping as low as -14°C (8°F) and averaging -2°C (28°F). The maximum temperature in December reaches only 13°C (55°F), and the month is notably dry, with just 2 mm (0.1 in) of precipitation over no rainy days. Additionally, the humidity lowers to 51%, making the air feel crisp and cold. For further details, you can visit Beijing weather in December.
As September rolls in, Beijing experiences a notable transition in weather, marking a shift from the sweltering heat of summer to a more comfortable and refreshing climate. With temperatures averaging a pleasant 22°C and a dip in humidity to 66%, it's a fantastic time to explore the city. Unlike the scorching highs of July and August, September's maximum reaches a more manageable 36°C, while nights can become quite cool, dropping to around 8°C. This month also sees a slight uptick in precipitation, averaging 63 mm over just five days, hinting at the approach of autumn. Whether you're strolling through historical sites or enjoying the city's vibrant culture, the September weather offers a perfect backdrop for outdoor adventures. For more insights into the distinct weather patterns throughout the year, visit Beijing Climate.