September Weather in Changchun, China

Last updated: August 21, 2025

In September, Changchun, China, experiences a dynamic shift in weather, marked by a maximum temperature soaring to 30°C (86°F) and a more moderate average temperature of 17°C (63°F). With lows dipping to 2°C (36°F), the month brings a refreshing chill as summer transitions to autumn. Rainfall plays a significant role, contributing 98 mm (3.9 in) over approximately 9 days, while humidity levels hover around a moist 84%. This blend of warmth, coolness, and precipitation creates a unique atmospheric experience, ideal for enjoying the changing seasons.

September Temperature in Changchun

In September, Changchun begins to transition from the sweltering heat of summer to the crispness of autumn. With minimum temperatures rising to 2°C (36°F) and an average hover of 17°C (63°F), this month enjoys a refreshing climate perfect for outdoor activities. The warmest days can reach up to 30°C (86°F), offering a delightful contrast to the chilly winters that lie ahead. Compared to the sweltering peak of August, where temperatures can soar to 37°C (99°F), September brings a welcome shift, making it an ideal time to explore the city's vibrant parks and get a taste of the upcoming harvest season.

September Weather in Changchun: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in Changchun, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Changchun, September typically has an average temperature of {2}°C ({3}°F), with highs reaching up to {4}°C ({5}°F) and lows dropping to around {6}°C ({7}°F).
JanFebMarAprMayJunJulAugSepOctNovDec71433496270787363472811
Data source: Temperature data for Changchun generated using information from the Copernicus Climate Change Service.
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The average of daily temperatures (24 hours) calculated across all days in the month.

September Precipitation in Changchun

In September, Changchun experiences a notable transition in its weather patterns, with precipitation levels reaching 98 mm (3.9 in) over approximately 9 days. This marks a significant drop from the peak rainfall of August, which recorded 193 mm (7.6 in) over 16 days. As summer fades, the sporadic rain in September helps to sustain the lush greenery that has flourished during the preceding months. The rainfall begins to wane dramatically moving into October, where it plummets to a mere 22 mm (0.9 in), signaling the onset of autumn and a shift toward drier conditions. Overall, September serves as a bridge between the wet summer months and the drier fall, showcasing the region's dynamic climate.

September Precipitation Trends in Changchun

The chart displays monthly precipitation patterns in Changchun, with values for each month alongside September’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how September’s conditions compare to those of other months. In Changchun, September typically receives around {2} mm ({3} inches) of precipitation spread over approximately {4} days.
JanFebMarAprMayJunJulAugSepOctNovDec56151555971481939823287
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Changchun

In September, Changchun experiences a notable shift in humidity, with levels reaching 84% as summer's warmth begins to wane. This slight decrease from the peak summer months of July and August, when humidity levels soar to 87% and 88% respectively, indicates a transition towards the drier autumn months. The humidity in September remains elevated compared to the earlier months of the year, where levels dipped to around 63% in April. As the year progresses, humidity trends show a general decrease from the sticky highs of summer, ultimately settling back to drier conditions by late fall. This gradual decline offers a refreshing change for residents and visitors alike, making September a particularly transitional month in Changchun's climatic pattern.

September Average Humidity in Changchun

This chart illustrates the average monthly humidity levels in Changchun, with September’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In September, average humidity in Changchun is approximately {2}%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec78%72%65%64%70%80%87%88%84%84%69%65%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Changchun

As summer gives way to autumn in September, Changchun experiences a shift in its UV Index, which drops to 7, categorizing it as high exposure. This notable change signals a safer outdoor experience compared to the sweltering summer months when the UV Index peaked at 9. With a burn time of 25 minutes, residents and visitors alike can enjoy the outdoors while still needing to take precautions against the sun's rays. This month serves as a transition, setting the stage for milder weather in the coming months, where the UV Index will continue to decrease. For more information on UV levels throughout the year, check out the Changchun UV Index.

Maximum UV Index Levels in Changchun for September

The chart shows the monthly maximum UV Index (UVI) for Changchun in September, representing the highest UV radiation level. The UVI measures the intensity of ultraviolet radiation from the sun, indicating the potential risk of sunburn and UV-related health issues. In September, the maximum UV index in Changchun typically reaches {2}, which falls under the {3} exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec235789997432
Data source: Changchun September UVI data generated using information from the Copernicus Climate Change Service.

UV Risk Categories

  •  Extreme (11+): Avoid the sun, stay in shade.
  •  Very High (8-10): Limit sun exposure.
  •  High (6-7): Use SPF 30+ and protective clothing.
  •  Moderate (3-5): Midday shade recommended.
  •  Low (0-2): No protection needed.

September Sunshine in Changchun

As the warmth of September settles in Changchun, the city basks in a delightful 277 hours of sunshine, marking a gentle descent from the summer peak. This month offers a lovely transition, sitting snugly between the vibrant brightness of July's 342 hours and the soft hues of October's 261 hours. Notably, September retains a generous amount of sunlight compared to the earlier months, especially with the steady climb seen from February's 237 hours to May's 312 hours. While the days begin to cool, the lingering warmth of late summer remains, casting golden rays that invite both locals and visitors to enjoy the outdoors before autumn’s chill sets in.

Monthly Sunshine Duration in Changchun: September Highlighted

The September sunshine duration represents the total number of hours Changchun experiences direct sunlight during the month of September, excluding cloudy or obstructed periods. This chart compares the sunshine duration of September with the other months of the year.
JanFebMarAprMayJunJulAugSepOctNovDec196h237h291h294h312h330h342h284h277h261h223h231h
Data source: Changchun September Sunshine duration data generated using information from the Copernicus Climate Change Service.

Chance of Sun in Changchun During September

As September rolls in, the chance of sunny weather in Changchun, China, dips to 37%, reflecting a broader trend of decreasing sunshine during the late summer months. This decline follows a peak earlier in the year, where January enjoys a notable 63% chance of sun, gradually diminishing through the summer. Despite this drop, September still offers a contrast to the cloudier months that follow, such as October, which rebounds to 61% sunshine likelihood. As autumn approaches, while sunny days become less frequent, they remain a welcome reprieve before the harsher winter sets in.

Percentage of Sunny Days in September in Changchun

The chart illustrates the percentage of sunny days in Changchun throughout the year, with September highlighted. It highlights the variation in sunshine across each month and provides an overview of the typical frequency of sunny days, offering insights into how often Changchun experiences clear skies throughout the year.
JanFebMarAprMayJunJulAugSepOctNovDec63%54%60%52%43%43%36%33%37%61%49%72%
Data source: Changchun September chance of sun data, generated using information from the Copernicus Climate Change Service.

Daylight Hours in Changchun in September

As September rolls into Changchun, China, the city experiences a moderate 12 hours of daylight, marking a gentle transition towards the shorter days of autumn. The daylight duration peaks in the summer months, reaching a high of 15 hours in June and July, before gradually receding. With the vibrant energy of summer fading, September offers a balanced mix of light and shadow, setting the stage for the stunning fall foliage. This decrease in daylight is part of a broader trend, as the region shifts from 14 hours of daylight in May to a notable decline, ultimately reaching just 8 hours by December. Observing these transitions not only highlights the beauty of seasonal change but also serves as a reminder of nature's rhythmic cycles.

Average Daylight Hours in Changchun for September

The chart illustrates the variation in daylight duration in Changchun throughout the year, with September highlighted. It shows the monthly changes in daylight hours, calculated by summing the hours between sunrise and sunset.
JanFebMarAprMayJunJulAugSepOctNovDec9h 18m10h 27m11h 56m13h 26m14h 44m15h 23m15h 3m13h 55m12h 28m10h 58m9h 38m8h 57m
Data source: Changchun daylight hours, calculated by summing the hours between sunrise and sunset for each day.

September Winds in Changchun

As September arrives in Changchun, China, the transition into autumn is marked by a gentle whisper of wind, averaging 2.7 m/s (6 mph)—the calmest of the year. This decline contrasts sharply with the seasonal highs experienced in spring and early summer, where wind speeds peak around 4.8 m/s (11 mph) in May. The shift to russet-hued landscapes is accompanied by a noticeable decrease in breeze, reflecting the tranquil pause before the chill of autumn deepens. Interestingly, this softening signifies not only the turn of the season but also highlights a pattern: following the vigor of April and May, nature invites moments of stillness, allowing residents to savor the crisp air and the gradual forthcoming chill of winter.

Average September Wind Speed in Changchun

The chart displays monthly wind speed patterns in Changchun, with values for each month shown alongside September's data, which is highlighted for easy comparison. It illustrates the average wind speed, offering insights into how September's wind conditions compare to the rest of the year.
JanFebMarAprMayJunJulAugSepOctNovDec3.54.24.34.64.83.53.13.12.7 m/s3.64.03.9
Data source: Changchun September wind data, generated using information from the Copernicus Climate Change Service.

How September Weather in Changchun Compares to Other Months

Weather in Changchun varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in Changchun, focusing on differences in temperature, rainfall, humidity, and UV levels.

September and January present strikingly different weather conditions. In September, temperatures range from a mild minimum of 2°C (36°F) to a warm maximum of 30°C (86°F), with an average temperature of 17°C (63°F). This month typically experiences 98 mm (3.9 in) of precipitation spread over nine days, accompanied by high humidity at 84%. In contrast, January is characterized by far harsher weather, with temperatures plummeting to a frigid minimum of -30°C (-22°F) and a maximum of only 2°C (36°F). The average temperature drops significantly to -14°C (7°F), and the month sees little precipitation, totaling just 5 mm (0.2 in) over only one day, with lower humidity at 78%. For more detailed insights on January weather, visit Changchun weather in January.

In comparing the weather between September and February, there is a stark contrast. September experiences temperatures ranging from a minimum of 2°C (36°F) to a maximum of 30°C (86°F), with an average of 17°C (63°F), and is characterized by higher humidity at 84% and moderate precipitation of 98 mm over 9 days. In sharp contrast, February is much colder, with temperatures plummeting to a minimum of -27°C (-16°F) and averaging -10°C (14°F), peaking at a milder 11°C (52°F). February also sees significantly less precipitation, only 6 mm over just 1 day, and lower humidity at 72%. This dramatic seasonal shift highlights the transition from warm, humid weather in September to the frigid conditions typical of February. For more specific insights, you can check Changchun weather in February.

September and March present stark contrasts in weather patterns. In September, temperatures range from a mild 2°C (36°F) at night to a warm 30°C (86°F) during the day, with an average of 17°C (63°F). The month sees a significant amount of rainfall, totaling 98 mm (3.9 in) over approximately 9 days, accompanied by high humidity levels at 84%.

In contrast, March experiences much colder temperatures, with a minimum of -19°C (-3°F) and an average temperature of 0°C (33°F), peaking at 22°C (72°F). The precipitation is minimal, amounting to just 15 mm (0.6 in) over 4 days, and humidity levels are lower at 65%. For more details on the weather during this month, you can refer to Changchun weather in March.

In September, weather conditions in the region reflect the transition into autumn, with temperatures ranging from a cool minimum of 2°C (36°F) to an average of 17°C (63°F) and a high of 30°C (86°F). The month experiences considerable humidity at 84% and sees an average of 98 mm (3.9 in) of precipitation over approximately 9 days. In contrast, April brings a more variable climate, with temperatures dipping as low as -7°C (19°F), averaging 9°C (49°F), and peaking at 29°C (85°F). This month is notably drier, with only 15 mm (0.6 in) of rainfall over 3 days and lower humidity at 63%. For a detailed look at April's weather patterns, visit Changchun weather in April.

In comparing the weather of September and May, both months showcase an average temperature of around 17°C (63°F), although September can experience hotter days with a maximum temperature reaching 30°C (86°F), compared to May's peak of 36°C (97°F). Precipitation levels also differ, with September averaging 98 mm (3.9 in) over 9 days, indicating a wetter month, while May sees lower rainfall at 55 mm (2.2 in) over just 8 days. Additionally, September has higher humidity at 84%, making it feel more sultry, whereas May maintains a more comfortable level at 70%. For more insights on May's weather specifics, you can check Changchun weather in May.

In September, the weather exhibits a wider temperature range, with minimums dipping to a chilly 2°C (36°F) and maximums reaching a warm 30°C (86°F), while the average temperature settles around 17°C (63°F). This month experiences 98 mm (3.9 in) of precipitation over 9 days and boasts high humidity at 84%. In contrast, June presents milder temperatures, starting at a minimum of 8°C (47°F), averaging 21°C (70°F), and peaking at 35°C (95°F). It has slightly less precipitation at 97 mm (3.8 in), but rain falls over 13 days, with humidity a bit lower at 80%. For more detailed insights on June weather, you can check Changchun weather in June.

September weather shows a notable transition into cooler temperatures, with a minimum of 2°C (36°F) and an average of 17°C (63°F), compared to July's warmer range that features a minimum of 13°C (56°F) and an average of 25°C (78°F). While July experiences higher maximum temperatures peaking at 35°C (95°F), September's maximum of 30°C (86°F) indicates a gradual shift towards autumn. Additionally, precipitation is more frequent in July, with 148 mm (5.8 in) over 14 days, versus September's 98 mm (3.9 in) across 9 days. Humidity levels are also slightly lower in September at 84%, compared to July’s 87%. For more detailed insights, check out Changchun weather in July.

In comparing the weather between September and August, a noticeable shift occurs. September sees a significant decrease in average temperatures, with minimums dropping to 2°C (36°F) and averages around 17°C (63°F), while August experiences milder conditions with minimums at 6°C (42°F) and an average of 23°C (73°F). Additionally, August is marked by higher maximum temperatures reaching up to 37°C (99°F), compared to September’s peak of 30°C (86°F). Precipitation also varies considerably; September records 98 mm (3.9 in) over 9 days, whereas August has much heavier rainfall of 193 mm (7.6 in) across 16 days, contributing to a more humid environment in August at 88%, compared to September’s 84%. For a detailed look at August weather, you can visit Changchun weather in August.

September and October present a noticeable shift in weather conditions. September enjoys a warmer average temperature of 17°C (63°F) with highs reaching up to 30°C (86°F), while October sees a cooler average of 8°C (47°F), with minimum temperatures dipping to -6°C (21°F). Precipitation is significantly higher in September, totaling 98 mm (3.9 in) across 9 days compared to October's much lower 22 mm (0.9 in) over just 4 days. Despite the drop in temperature, both months share the same humidity level of 84%, contributing to a similar feel in terms of moisture in the air. For a detailed climate description, you can refer to Changchun weather in October.

September and November present a stark contrast in weather patterns. In September, temperatures range from a minimum of 2°C (36°F) to a maximum of 30°C (86°F), with an average of 17°C (63°F). This month also sees relatively high humidity at 84% and about 98 mm (3.9 in) of precipitation over 9 days. In stark contrast, November experiences much colder weather, with temperatures dropping to a minimum of -16°C (3°F) and an average of -2°C (29°F), peaking at just 17°C (62°F). Precipitation is significantly lower at 28 mm (1.1 in), spread over only 4 days, and the relative humidity decreases to 69%. For more detailed information, you can visit Changchun weather in November.

In comparing the weather between September and December, notable contrasts emerge. September typically sees a range of temperatures from a minimum of 2°C (36°F) to a maximum of 30°C (86°F), with an average of 17°C (63°F). The month experiences significant precipitation, totaling 98 mm (3.9 in) over about 9 days, accompanied by high humidity levels at 84%. In stark contrast, December's weather is characterized by a much colder climate, featuring minimum temperatures plunging to -27°C (-16°F) and a maximum of only 7°C (45°F), resulting in an average of -12°C (11°F). Precipitation drops dramatically to just 7 mm (0.3 in), occurring on only 1 day, and humidity decreases to 65%. For more detailed insights, you can check Changchun weather in December.

Compare Changchun's Climate with Cities Worldwide

Conclusion: What to Expect From September Weather in Changchun

As summer gently fades, September in Changchun offers a delightful transition marked by milder temperatures and an increased chance of rain. With an average temperature around 17°C (63°F), it contrasts sharply with the warmer months, bringing a refreshing coolness, especially in the mornings and evenings. The month sees a fair amount of precipitation, making it one of the wetter periods of the year, as the city experiences about nine rainy days. This rise in humidity to 84% adds a subtle complexity to the air, setting the stage for the vibrant autumn foliage. For more detailed insights into Changchun's climate, visit Changchun Climate.