Last updated: August 21, 2025
In September, Longmen, China experiences a notable transition in weather, with temperatures ranging from a maximum of 15°C (59°F) to a minimum of -16°C (4°F), averaging around 0°C (33°F). This month typically sees about 99 mm (3.9 in) of precipitation over roughly 15 days, contributing to a high humidity level of 83%. These conditions create a distinct, brisk atmosphere, highlighting the blend of crisp air and the onset of autumnal changes in the region.
In September, Longmen, China transitions towards cooler weather, marking a significant shift in temperatures. With a minimum of −16°C (4°F) and an average hovering around 0°C (33°F), this month offers a respite from the extreme cold of winter, yet still clings to some chill. Daytime temperatures manage to reach a maximum of 15°C (59°F), hinting at the gradual embrace of autumn. Compared to the preceding months, where temperatures have lingered around slightly more moderate levels, September signals a notable drop, paving the way for the icy grip of winter that follows in October. This transitional phase showcases Longmen's characteristic climatic fluctuations, presenting visitors with an opportunity to experience its unique seasonal ambiance.
September in Longmen, China, marks a notable transition within the region's yearly precipitation pattern. With 99 mm (3.9 in) of rainfall spread over 15 days, this month represents a significant decrease from the torrential downpours of July and August, which saw 185 mm (7.3 in) and 184 mm (7.3 in) respectively. As summer gives way to autumn, the rainfall becomes more moderate yet still substantial, reflecting the tail end of the wet season. This shift not only signals the gradual reduction in precipitation but also sets the stage for the dryer months ahead, as October typically brings only 32 mm (1.3 in) of rain. Thus, September serves as a bridge, balancing between the remnants of summer showers and the upcoming fall dryness.
In September, Longmen, China, experiences a notable shift in humidity, recorded at 83%. This level, while slightly lower than the intense peak of 85% seen in August, reflects the region's ongoing transition towards autumn. As summer wanes, the humidity remains relatively high compared to the earlier months of the year, such as January's 70% and February's 74%. The trend throughout the year indicates a gradual rise in humidity reaching its climax in the heart of summer, followed by a gentle decline into the cooler months. As October approaches, with humidity expected to fall to 82%, the air retains a lingering warmth, signaling the slow embrace of autumn’s crispness.
In September, Longmen, China, experiences a UV Index of 12, categorizing it as extreme exposure. This marks a slight decrease from the peak of 18 in June, but it still warrants caution as the burn time is approximately 10 minutes. Throughout the summer months, the UV levels remained alarmingly high, with a consistent trend towards more extreme ratings, particularly during May to August. As the year progresses into autumn, the UV Index begins to taper off, yet September stands as a reminder of the lingering intensity of the sun's rays. Residents and visitors alike should remain vigilant in their sun protection strategies during this time. For detailed and updated UV information, check out Longmen UV Index.
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September in Longmen, China, enjoys a delightful 312 hours of sunshine, marking a transition toward the cooler months. This month is part of a serene trend in sunlight hours, where the summer peaks of July (352 hours) and August (345 hours) gradually give way to the more temperate autumn days. While September sees a slight decline from the summer highs, it remains comfortably above the winter months, such as January (237 hours) and February (287 hours), showcasing that the warmth of summer lingers in the air. As daylight begins to mellow, September offers a perfect blend of warmth and respite, making it an ideal time to explore the scenic beauty of Longmen.
In Longmen, China, September offers a refreshing uptick in sunshine, with a 54% chance of clear skies that marks a pleasant contrast to the summer months. This increase follows a notably lower likelihood of sun during June, July, and August, which sees only 24% to 32% of sunny days. As the seasons shift, September serves as a transition point, bridging the humid summer to the crisp autumn chill. Interestingly, the likelihood of sunny weather remains relatively stable into October at 53%, hinting that the region enjoys a lingering warmth before the onset of winter, characterized by higher chances of sun in the months leading up to December. Overall, September stands out as a delightful opportunity for outdoor activities, bathed in gradually brightening days.
As September unfolds in Longmen, China, residents experience a shift in daylight duration, with the sun gracing the skies for 12 hours, a slight decline from the 14 hours observed during the summer months. This transition hints at the gradual onset of autumn, following a trend that sees daylight hours steadily decreasing from the peak of summer. May through August enjoys the longest days, making way for a more balanced 12-hour light in September before dipping to 11 hours in October. As the year progresses, it’s clear that Longmen is on a captivating journey, trading summer’s vibrant daylight for the cozy charm of fall.
As September arrives in Longmen, the average wind speed sees a modest rise to 2.7 m/s (6 mph), a gentle increase after the calmer summer months. This slight uptick signals the transition into autumn, where winds begin to regain some strength compared to the preceding months. From a peak of 4.6 m/s in January, the winds gradually taper down to their annual lows in the heart of summer, notably around 2.3 m/s from May to July. However, as temperatures cool and nature prepares for the colder months, the winds pick up slightly once more, reflecting the cyclical rhythm of the seasons. With October following closely on the heels of September at 2.8 m/s, it's evident that the blustery character of Longmen's fall emerges, inviting a refreshing change in the air.
Weather in Longmen varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in Longmen, 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 chilly -16°C (4°F) at their lowest to a pleasant 15°C (59°F) at their peak, with an average temperature of 0°C (33°F). The month sees considerable precipitation, with about 99 mm (3.9 in) falling over 15 days, resulting in a high humidity level of 83%. On the other hand, January is significantly colder, with temperatures plummeting to a minimum of -37°C (-34°F) and averaging -19°C (-2°F), only reaching a maximum of -1°C (31°F). This month experiences minimal precipitation, around 5 mm (0.2 in), over just one day, along with a lower humidity of 70%. For more insights into the weather during this month, check out Longmen weather in January.
In September, the weather is significantly milder, with average temperatures around 0°C (33°F) and highs reaching up to 15°C (59°F). This month experiences more precipitation, with about 99 mm (3.9 in) spread over 15 days, resulting in higher humidity levels of 83%. In contrast, February showcases a much harsher climate, with average temperatures dropping to -16°C (3°F) and maximums only reaching 4°C (40°F). Precipitation is sparse at just 10 mm (0.4 in) over 3 days, contributing to a lower humidity of 74%. For a more detailed look at February's weather, visit Longmen weather in February.
September and March exhibit stark contrasts in weather patterns. In September, temperatures range from a minimum of -16°C (4°F) to a maximum of 15°C (59°F), with an average of 0°C (33°F). This month experiences higher levels of precipitation at 99 mm (3.9 in) over approximately 15 days, accompanied by a humidity of 83%. In contrast, March is significantly colder, with temperatures dropping to a minimum of -32°C (-25°F) and peaking at 7°C (44°F), averaging -11°C (12°F). Precipitation in March is considerably less, at just 23 mm (0.9 in) over 7 days, with a humidity slightly lower at 79%. For more details on March weather, you can check Longmen weather in March.
Comparing the weather in September and April reveals notable differences. In September, the temperatures range from a low of -16°C (4°F) to a comfortable high of 15°C (59°F), with an average of 0°C (33°F). This month typically sees around 99 mm (3.9 in) of precipitation over 15 days and maintains a humidity level of 83%. In contrast, April presents a colder climate, with temperatures dipping down to a minimum of -23°C (-10°F) and peaking at just 8°C (47°F), resulting in a higher average low of -7°C (19°F). Precipitation in April is less, at 45 mm (1.8 in) over 9 days, and humidity is slightly lower at 77%. For more detailed information, visit Longmen weather in April.
September and May present contrasting weather conditions. In September, temperatures fluctuate between a minimum of -16°C (4°F) and a maximum of 15°C (59°F), with an average of 0°C (33°F). The month experiences significant precipitation, totaling 99 mm (3.9 in) over 15 days, along with high humidity at 83%. In contrast, May features colder temperatures, with a minimum of -24°C (-11°F) and a maximum of 8°C (48°F), averaging -4°C (25°F). Although May has lower precipitation at 72 mm (2.8 in) across 12 days, the humidity is slightly less at 75%. For a deeper look at the weather patterns in May, you can check out Longmen weather in May.
In September, the weather showcases a wide temperature range from a chilly minimum of -16°C (4°F) to a maximum of 15°C (59°F), with an average hovering around 0°C (33°F). The month experiences a significant amount of precipitation, totaling 99 mm (3.9 in) over approximately 15 days, coupled with high humidity at 83%. Conversely, June sees slightly milder temperatures, with a minimum of -11°C (12°F) and a maximum of 15°C (60°F), while the average is slightly warmer at 1°C (35°F). Additionally, June is wetter, with 128 mm (5.0 in) of rain over 19 days and a slightly lower humidity level at 80%. For more detailed weather insights, you can explore Longmen weather in June.
In comparison to July, September experiences a notable drop in temperatures, with minimums reaching -16°C (4°F) and an average temperature of around 0°C (33°F). July, on the other hand, sees milder conditions with minimums of -8°C (19°F) and an average temperature of 5°C (42°F). Precipitation is more pronounced in July, totaling 185 mm (7.3 in) over 22 days, compared to September’s 99 mm (3.9 in) spread over 15 days. Interestingly, the humidity remains fairly consistent between the two months, with September at 83% and July slightly lower at 82%. For a closer look at July's weather specifics, you can check this Longmen weather in July.
In comparing the weather of September and August, it is evident that September experiences a significant drop in average temperatures, with a minimum of -16°C (4°F) compared to August's minimum of -7°C (19°F). Both months have a maximum temperature of 15°C (59°F), but September's average is lower at 0°C (33°F) versus August's 5°C (41°F). Moreover, September witnesses less precipitation, totaling 99 mm (3.9 in) over 15 days, while August has a heavier rainfall accumulation of 184 mm (7.3 in) over 23 days, exhibiting a wetter month overall. Humidity levels remain comparable, with September at 83% and August slightly higher at 85%. For more detailed insights into August weather, you can visit Longmen weather in August.
In comparing the weather between September and October, one can observe a notable drop in temperatures as autumn progresses. September boasts a minimum of -16°C (4°F) and an average of 0°C (33°F), with maximum temperatures reaching 15°C (59°F). The month also sees considerable precipitation, totaling 99 mm (3.9 in) over 15 days, accompanied by a humidity level of 83%. In contrast, October brings even colder conditions, with minimum temperatures plummeting to -23°C (-9°F) and an average of -7°C (19°F), while the maximum temperature does not exceed 10°C (51°F). Precipitation significantly decreases to 32 mm (1.3 in) over just 7 days, and humidity remains similar at 82%. For more detailed information, please visit Longmen weather in October.
In September, the weather is relatively mild, with temperatures ranging from a chilly -16°C (4°F) at night to a maximum of 15°C (59°F) during the day, and an average temperature around 0°C (33°F). The month sees a significant amount of precipitation, totaling 99 mm (3.9 in) over about 15 days, contributing to high humidity levels at 83%. In contrast, November brings much colder conditions, with temperatures dropping significantly to a minimum of -34°C (-29°F) and an average of -15°C (5°F), with daytime highs barely reaching 3°C (38°F). Precipitation is minimal, with only 7 mm (0.3 in) expected over 2 days and a decrease in humidity to 74%. For a closer look at November's weather, you can check Longmen weather in November.
In September, temperatures in Longmen range from a chilly minimum of -16°C (4°F) to a pleasant maximum of 15°C (59°F), with an average around 0°C (33°F). The month experiences significant precipitation, totaling 99 mm (3.9 in) over approximately 15 days, coupled with high humidity levels at 83%.
In contrast, December brings much colder temperatures, with a minimum of -34°C (-29°F) and an average of -19°C (-2°F), reaching a maximum of just -1°C (30°F). Additionally, December is remarkably dry, recording only 3 mm (0.1 in) of precipitation over the course of the month and experiencing no rainy days, with a drop in humidity to 66%. For more insights into December weather specifics, you can check this link: Longmen weather in December.
As September unfolds in Longmen, the weather presents a dramatic transition from the warm summer months. With lower temperatures settling in and significant daily fluctuations, the crisp September air contrasts sharply with the heat of previous months. This is paired with heightened humidity levels and increased rainfall, marking a shift toward a more autumnal climate. The 15 days of precipitation serve as a reminder that while summer may have bid adieu, the region prepares for the cooler days ahead. For a more detailed look at how September weather shapes the overall climate of Longmen, visit Longmen Climate.