September Weather in Bohai, China

Last updated: August 21, 2025

In September, Bohai, China experiences a delightful mix of warmth and refreshing breezes, with maximum temperatures reaching up to 33°C (92°F). The average temperature hovers around a comfortable 19°C (67°F), while nights can dip to a cool 5°C (41°F), offering a pleasant range for visitors. The month also sees about 75 mm (2.9 in) of precipitation over 8 days, contributing to its lush landscapes. With a humidity level of 74%, the air feels pleasantly balmy, ideal for outdoor exploration and enjoying the natural beauty of the region.

September Temperature in Bohai

In Bohai, China, September ushers in a pleasant transition from the sweltering summer heat, as temperatures begin to dip. With a minimum of 5°C (41°F) and an average of 19°C (67°F), the month features comfortable days ideal for outdoor activities. The maximum temperature peaks at 33°C (92°F), providing just enough warmth to enjoy the lingering summer sun. As the month progresses, the warmth of summer gradually yields to the crispness of autumn, marking a significant shift in the climate. This seasonal change reflects a broader trend in Bohai's weather patterns, where September acts as a gateway to cooler months, inviting residents and visitors alike to embrace the beauty of nature as it transforms.

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

The chart illustrates September temperature patterns in Bohai, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Bohai, 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).
JanFebMarAprMayJunJulAugSepOctNovDec212741546674767566513624
Data source: Temperature data for Bohai 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 Bohai

In September, Bohai, China experiences a significant shift in precipitation patterns, with 75 mm (2.9 in) of rain over 8 days marking the transition to autumn. This amount reflects a notable decrease from the preceding months of intense rainfall, such as July and August, when storms brought 262 mm (10.3 in) and 197 mm (7.8 in), respectively. However, September's rainfall is still substantial, indicating the tail end of the wet season, as days grow shorter and temperatures begin to cool. The gradual drop in precipitation from almost daily summer downpours underscores the region’s climate transition, highlighting a balanced interplay between the lingering effects of summer moisture and the onset of drier autumn conditions.

September Precipitation Trends in Bohai

The chart displays monthly precipitation patterns in Bohai, 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 Bohai, September typically receives around {2} mm ({3} inches) of precipitation spread over approximately {4} days.
JanFebMarAprMayJunJulAugSepOctNovDec28192229632621977537183
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Bohai

September marks a noticeable transition in humidity patterns for Bohai, China, with levels averaging around 74%. This month sits comfortably between the sweltering peak of 83% in August and the relatively drier conditions of 74% in October, indicating a gradual winding down of summer’s oppressive moisture. Throughout the year, humidity typically rises from a modest 52% in March to a peak in mid-summer, reflecting the region's humid subtropical climate. Autumn arrives with an inviting drop, providing a sweet relief from the summer's humidity, while the overall trend highlights the significant influence of seasonal shifts on local weather conditions.

September Average Humidity in Bohai

This chart illustrates the average monthly humidity levels in Bohai, 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 Bohai is approximately {2}%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec65%59%52%56%56%68%78%83%74%74%58%60%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Bohai

As September rolls in Bohai, China, the UV Index remains at a very high level of 8, signaling the need for caution during outdoor activities. This month continues the trend of high UV exposure, consistent with the summer months, though slightly less intense than July's peak at 10. With a burn time of just 15 minutes, it's crucial for sun-seekers to protect their skin, especially following the intensifying UV levels observed from April through August. As the season transitions into autumn, the UV Index will gradually decrease in the following months, but for now, staying sun-safe is essential. For more details on UV levels throughout the year, check out Bohai UV Index.

Maximum UV Index Levels in Bohai for September

The chart shows the monthly maximum UV Index (UVI) for Bohai 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 Bohai typically reaches {2}, which falls under the {3} exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec2458991098632
Data source: Bohai 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 Bohai

September in Bohai, China, offers a delightful blend of warm days and ample sunshine, with 280 hours of sunlight gracing the skies. This month marks a slight decrease in sunlight compared to the vibrant summer months of May and August, which recorded peaks of 329 and 311 hours respectively. However, September maintains a solid standing within the annual trend, outshining earlier months like January and February, which see far less sunshine. As the year transitions into autumn, the sunlight begins to taper off, yet September remains a cherished month, bridging the joy of summer with the gentler embrace of fall, making it a perfect time for outdoor activities under the golden rays.

Monthly Sunshine Duration in Bohai: September Highlighted

The September sunshine duration represents the total number of hours Bohai 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.
JanFebMarAprMayJunJulAugSepOctNovDec215h259h298h300h329h322h291h311h280h266h244h259h
Data source: Bohai September Sunshine duration data generated using information from the Copernicus Climate Change Service.

Chance of Sun in Bohai During September

In Bohai, China, the likelihood of sunny weather experiences distinct seasonal shifts, with September showing a moderate 40% chance of sunshine. As summer transitions into autumn, the sunniest months are behind, with July boasting just a 24% likelihood, highlighting a significant drop in sunny days during the peak of summer. Conversely, the year begins on a brighter note, with January leading at an impressive 82% chance of sun. Following this peak, the chances gradually decline through spring and summer, before recovering in late autumn, with October bringing a 58% likelihood. Overall, while September offers a tempered chance for sunny weather, the trends suggest a gradual return to gloomier days as the year progresses.

Percentage of Sunny Days in September in Bohai

The chart illustrates the percentage of sunny days in Bohai 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 Bohai experiences clear skies throughout the year.
JanFebMarAprMayJunJulAugSepOctNovDec82%68%49%56%53%45%24%46%40%58%75%84%
Data source: Bohai September chance of sun data, generated using information from the Copernicus Climate Change Service.

Daylight Hours in Bohai in September

In Bohai, China, daylight duration exhibits a clear seasonal rhythm that reflects the changing months. January starts off the year with only 9 hours of light, but as February rolls in, you gain an extra hour that hints at the approaching spring. By March, daylight extends to 11 hours, while April ushers in a significant boost to 13 hours, signaling the full bloom of spring. May and June offer the longest days of the year, peaking at 14 and 15 hours respectively, providing ample time for outdoor activities. However, this abundance begins to wane in July and August, as daylight gradually retreats to 14 and 13 hours. September marks a noticeable drop to 12 hours, foreshadowing the arrival of fall. As the days shorten further into October and November, culminating in a return to 9 hours by December, the cycle of daylight in Bohai embodies the enchanting transformations of each season.

Average Daylight Hours in Bohai for September

The chart illustrates the variation in daylight duration in Bohai throughout the year, with September highlighted. It shows the monthly changes in daylight hours, calculated by summing the hours between sunrise and sunset.
JanFebMarAprMayJunJulAugSepOctNovDec9h 37m10h 38m11h 56m13h 17m14h 26m15h14h 43m13h 43m12h 25m11h 5m9h 55m9h 18m
Data source: Bohai daylight hours, calculated by summing the hours between sunrise and sunset for each day.

September Winds in Bohai

As summer fades into autumn, September winds in Bohai, China, shift to their calmest, with average wind speeds dropping to a gentle 1.5 m/s (3 mph). This decline continues the trend observed throughout the warmer months, where winds were relatively light, particularly in July and August, with speeds of 1.5 m/s and 1.6 m/s, respectively. The cooler prelude to October doesn't bring a stark increase, as the winds gently pick back up to 1.8 m/s. Overall, the data reflects a pattern of light breezes during the late summer to early fall transition, perfect for those seeking tranquility along Bohai's serene shores.

Average September Wind Speed in Bohai

The chart displays monthly wind speed patterns in Bohai, 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.
JanFebMarAprMayJunJulAugSepOctNovDec2.12.12.02.42.62.01.51.61.5 m/s1.82.32.1
Data source: Bohai September wind data, generated using information from the Copernicus Climate Change Service.

How September Weather in Bohai Compares to Other Months

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

September and January present stark contrasts in weather conditions. In September, temperatures can range from a cool 5°C (41°F) at night to a warm 33°C (92°F) during the day, with an average of 19°C (67°F). This month also sees considerable precipitation, averaging 75 mm (2.9 in) with rain on about 8 days, accompanied by relatively high humidity at 74%. In contrast, January experiences much colder temperatures, with a minimum of -23°C (-10°F) and a maximum of 9°C (49°F), leading to an average of -6°C (21°F). Additionally, January is quite dry, receiving only 2 mm (0.1 in) of precipitation over the month and typically having no rainy days, with a lower humidity of 65%. For more details on January weather in the Bohai region, you can check Bohai weather in January.

September and February offer starkly contrasting weather conditions. In September, temperatures range from a minimum of 5°C (41°F) to a maximum of 33°C (92°F), with an average of 19°C (67°F). This month also experiences significant precipitation, totaling 75 mm (2.9 in) over about 8 days, and a relatively high humidity of 74%. In contrast, February features much colder temperatures, with a minimum of -17°C (1°F) and a maximum of 21°C (69°F), averaging -3°C (27°F). This month is much drier, with only 8 mm (0.3 in) of precipitation on just 1 day and lower humidity at 59%. For more detailed insights on the February climate, check out this resource: Bohai weather in February.

In September, temperatures range from a cool 5°C (41°F) at night to a warm 33°C (92°F) during the day, with an average of 19°C (67°F). The month sees a significant amount of precipitation, totaling 75 mm (2.9 in) over approximately 8 days, contributing to a high humidity level of 74%. In contrast, March experiences much colder conditions, with temperatures dipping as low as -10°C (14°F) at night and reaching a maximum of 24°C (76°F) during the day, averaging just 5°C (42°F). The winter month is relatively dry, with only 19 mm (0.7 in) of precipitation over 4 days and lower humidity at 52%. For a more detailed look at March weather, you can visit Bohai weather in March.

September and April exhibit contrasting weather patterns that reflect the transition between seasons. In September, temperatures range from a minimum of 5°C (41°F) to a maximum of 33°C (92°F), with an average of 19°C (67°F). This month experiences higher humidity at 74% and more precipitation, totaling 75 mm over about 8 days. In contrast, April offers a cooler climate, with temperatures ranging from a minimum of -3°C (27°F) to a maximum of 32°C (89°F) and an average of 12°C (55°F). The precipitation is significantly lower in April, totaling just 22 mm over 2 days, and the humidity is at 56%. For more details on April weather, you can explore Bohai weather in April.

In September, temperatures are generally more variable, ranging from a cool 5°C (41°F) at night to a warm 33°C (92°F) during the day, with an average of 19°C (67°F). The month experiences higher humidity at 74% and sees more precipitation, with about 75 mm (2.9 in) falling over 8 days. In contrast, May offers slightly cooler nights with a minimum of 2°C (35°F) and a maximum temperature peaking at 34°C (94°F), maintaining a similar average of 19°C (66°F). May is significantly drier, with only 29 mm (1.1 in) of rainfall over 5 days and lower humidity at 56%. This makes May a more comfortable month overall, as indicated in Bohai weather in May.

In comparing September and June weather, September tends to be slightly cooler and more variable, with average temperatures ranging from a minimum of 5°C (41°F) to a maximum of 33°C (92°F) and an overall average of 19°C (67°F). It also sees more precipitation, with 75 mm (2.9 in) falling over about 8 days, resulting in higher humidity levels at 74%. In contrast, June is warmer, with temperatures ranging from a minimum of 10°C (50°F) to a peak of 37°C (98°F) and an average of 23°C (74°F). June experiences slightly less rainfall, totaling 63 mm (2.5 in) over 10 days, accompanied by a lower humidity of 68%. For a closer look at June weather specifics, you can visit Bohai weather in June.

In comparing September and July weather, September offers a more moderate climate with temperatures ranging from a minimum of 5°C (41°F) to a maximum of 33°C (92°F) and an average of 19°C (67°F). In contrast, July is significantly warmer, featuring higher temperatures with a minimum of 15°C (58°F), an average of 25°C (77°F), and a peak at 36°C (97°F). Additionally, July experiences much heavier rainfall, totaling 262 mm (10.3 in) over 18 days, while September sees considerably less precipitation at 75 mm (2.9 in) across 8 days. Both months display high humidity levels, with July slightly higher at 78% compared to September's 74%. For a detailed look at July conditions, please visit Bohai weather in July.

In comparison to August, September experiences a noticeable drop in temperatures, with average highs of 33°C (92°F) compared to August's peak of 35°C (95°F). The minimum temperatures in September are significantly cooler, starting at 5°C (41°F) compared to August’s 12°C (54°F). Precipitation also decreases in September, with only 75 mm (2.9 in) over 8 days, whereas August sees a much higher total of 197 mm (7.8 in) spread over 15 days. However, humidity levels remain relatively high, with September averaging 74%, close to August's 83%. For more detailed insights about August's weather conditions, you can check Bohai weather in August.

September tends to be warmer, with temperatures ranging from a minimum of 5°C (41°F) to a maximum of 33°C (92°F) and an average of 19°C (67°F), making it a month filled with summer-like heat. The month also sees more precipitation, totaling 75 mm (2.9 in) over 8 days, contributing to a humid atmosphere at 74%. In contrast, October marks a distinct transition into cooler weather, with temperatures dropping to a minimum of -2°C (28°F) and averaging 10°C (51°F) while still peaking at a comfortable 27°C (81°F). This month experiences significantly less rainfall, accumulating only 37 mm (1.5 in) across just 4 days, yet maintaining the same humidity level of 74%. For more information about the weather in October, visit Bohai weather in October.

September and November present starkly contrasting weather conditions. In September, temperatures range significantly with a minimum of 5°C (41°F) and an average of 19°C (67°F), peaking at a warm 33°C (92°F). This month also experiences moderate precipitation at 75 mm (2.9 in) over about 8 days, accompanied by relatively high humidity at 74%. In contrast, November sees much cooler temperatures, with a minimum dropping to -10°C (14°F) and an average of just 2°C (37°F), while the maximum only reaches 22°C (71°F). Precipitation decreases substantially to 18 mm (0.7 in) spread over 3 days, and humidity levels fall to 58%. For more detailed information, you can check out Bohai weather in November.

In September, the weather is warm and varies significantly, with temperatures ranging from a cool 5°C (41°F) at night to a hot 33°C (92°F) during the day. The month experiences moderate precipitation with about 75 mm (2.9 in) of rain over 8 days, accompanied by a relatively high humidity level of 74%. In contrast, December brings much colder conditions, with minimum temperatures dropping to -18°C (0°F) and an average of -5°C (24°F). The maximum temperature reaches only 10°C (50°F), and precipitation is minimal, amounting to just 3 mm (0.1 in) over a single day, while humidity decreases to around 60%. For more detailed information about December weather, you can visit Bohai weather in December.

Compare Bohai's Climate with Cities Worldwide

Conclusion: What to Expect From September Weather in Bohai

As September unfolds in Bohai, it showcases a remarkable transition in weather, setting it apart from the sweltering summer months. The temperatures begin to drop, offering a pleasant average that is ideal for outdoor activities. While the maximum warmth can still reach up to 33°C, the nights become cooler, inviting a refreshing change with lows dipping down to 5°C. This month also brings increased humidity and a modest amount of precipitation, creating a balanced climate that supports the region's lush landscapes. In contrast to the dryness of preceding months, the occasional rain—spanning about eight days—nourishes the earth, making September a delightful time to experience Bohai's unique charm. For more insights on this captivating weather pattern, check out Bohai Climate.