September Weather in Bremen, Germany

Last updated: February 26, 2025

Bremen, Germany, in September offers a captivating transition into autumn, showcasing a temperature range from a refreshing 3°C (38°F) at night to a sun-kissed 31°C (89°F) during the day. With an average temperature hovering around 15°C (59°F), visitors can enjoy the crisp air of early fall. Precipitation is moderate, totaling 54 mm (2.1 in) over 10 days, contributing to the region's lush greenery. The humidity is notably high at 81%, adding a slight chill to the warm days and making it a unique month for exploring the vibrant culture and scenic beauty of Bremen.

September Temperature in Bremen

In September, Bremen transitions into cooler days as summer begins to fade. With minimum temperatures hovering around 3°C (38°F), the city showcases a gentle decline from the highs of summer. However, the average temperature climbs to a pleasant 15°C (59°F), making it an inviting time to explore the outdoors. Peak temperatures can reach up to 31°C (89°F), offering a final taste of warmth before autumn fully sets in. This month serves as a bridge, where you can bask in the last rays of summer sunshine while enjoying the crispness of early fall air, creating a perfect blend for outdoor activities and cultural festivals.

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

The chart illustrates September temperature patterns in Bremen, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends.
JanFebMarAprMayJunJulAugSepOctNovDec383942485564656659534440
Data source: Temperature data for Bremen 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 Bremen

September in Bremen, Germany, marks a transition in weather as summer gives way to autumn. With an average precipitation of 54 mm (2.1 in), September experiences a noticeable dip compared to the preceding months, particularly August, which sees 77 mm (3.0 in) of rain. This decrease is also reflected in the number of rainy days, with September recording just 10 days of precipitation. The overall trend hints at a gradual shift toward wetter conditions in October, which typically brings more robust rainfall at 87 mm (3.4 in) and 14 days of rain. The mild drop in September’s precipitation might encourage outdoor enthusiasts to enjoy the lingering warmth before the heavier rains of fall set in.

September Precipitation Trends in Bremen

The chart displays monthly precipitation patterns in Bremen, 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.
JanFebMarAprMayJunJulAugSepOctNovDec616064495875747754874976
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Bremen

In September, Bremen, Germany experiences a notable shift in humidity, with levels resting at 81%. This increase follows a gradual decline from the peak of 91% in January, showcasing a clear trend of decreasing humidity through the spring and summer months, where it reaches its lowest point at 66% in both June and July. However, as autumn approaches, humidity begins to rise again, hinting at the inevitable return of the wetter conditions typical of the region. Compared to August's 67%, September’s figure signifies a return to more familiar, high-humidity levels, setting the stage for the incoming cooler season. As the year progresses into October and November, humidity will continue to climb, reinforcing Bremen’s reputation for a damp, overcast autumn.

September Average Humidity in Bremen

This chart illustrates the average monthly humidity levels in Bremen, with September's data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, allowing you to see how September's humidity levels compare to other months.
JanFebMarAprMayJunJulAugSepOctNovDec91%89%87%82%73%66%66%67%81%86%90%90%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Bremen

As summer transitions into autumn, September in Bremen, Germany, presents a moderate UV Index of 5. This marks a notable decrease from the peak summer months, with August's high levels reflecting a lingering warmth. During this time, burn time is estimated at 30 minutes, allowing for safe outdoor enjoyment, but caution is still warranted. With this gradual drop, September encourages outdoor activities with the assurance of lower sun exposure risks compared to the height of summer. For more detailed insights on UV levels throughout the year, visit Bremen UV Index.

Maximum UV Index Levels in Bremen for September

The chart shows the monthly maximum UV Index (UVI) for Bremen 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.
JanFebMarAprMayJunJulAugSepOctNovDec124578775321
Data source: Bremen 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 Bremen

As September arrives in Bremen, the city basks in the glow of 303 hours of sunshine, a delightful transition from the vibrant summer months. This bountiful light marks a notable dip from the peak of summer, where June and July dazzled with nearly 400 hours, yet it remains a significant sun-kissed conclusion to the season. The gradual decline in sunlight from the lush light of early summer through to the cooler days of autumn is a familiar trend, but September's rays still offer a cheerful embrace before the gloomier months set in. After a warm and bright summer, this month serves as a reminder of nature's rhythm, heralding the cozy fall ahead while still gifting ample opportunities to relish the outdoor beauty of Bremen.

Monthly Sunshine Duration in Bremen: September Highlighted

The September sunshine duration represents the total number of hours Bremen 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.
JanFebMarAprMayJunJulAugSepOctNovDec101h180h255h345h386h394h392h379h303h237h163h111h
Data source: Bremen September Sunshine duration data generated using information from the Copernicus Climate Change Service.

Chance of Sun in Bremen During September

In Bremen, Germany, September enjoys a 31% chance of sunny weather, making it a favorable transition month as summer wanes. This likelihood matches that of August, suggesting a pattern of consistent sunshine as the year progresses, particularly when compared to the more dreary winter months. Notably, the chances of clear skies begin to decline in October, plummeting to 25%, which highlights September's importance as a last hurrah for sun-seekers. While the weather may not be as reliably bright as the peak summer months, September still offers a welcome opportunity for outdoor activities against a backdrop of fading summer warmth.

Percentage of Sunny Days in September in Bremen

The chart illustrates the percentage of sunny days in Bremen 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 Bremen experiences clear skies throughout the year.
JanFebMarAprMayJunJulAugSepOctNovDec14%25%36%39%29%30%27%31%31%25%16%18%
Data source: Bremen September chance of sun data, generated using information from the Copernicus Climate Change Service.

Daylight Hours in Bremen in September

As summer fades, September in Bremen, Germany marks a notable transition in daylight duration, settling at 12 hours. Following the sun-drenched months of June and July, which basked in 16 hours of daylight, the days start to shorten gradually. While September still enjoys a respectable amount of light, it’s a clear signal of the approaching autumn. This month serves as a bridge, blending the lingering warmth of summer with the crispness of fall, as daylight dwindles from August's 14 hours to October's 10 hours. The changing light not only influences the landscape but also sets the tone for a cozy shift in atmosphere, inviting residents to embrace the beauty of the season.

Average Daylight Hours in Bremen for September

The chart illustrates the variation in daylight duration in Bremen throughout the year, with September highlighted. It shows the monthly changes in daylight hours, calculated by summing the hours between sunrise and sunset.
JanFebMarAprMayJunJulAugSepOctNovDec8h 11m9h 51m11h 54m14h15h 50m16h 48m16h 17m14h 38m12h 36m10h 32m8h 39m7h 39m
Data source: Bremen daylight hours, calculated by summing the hours between sunrise and sunset for each day.

September Winds in Bremen

As summer fades into autumn, September in Bremen brings a subtle shift in the air, marked by an average wind speed of 2.9 m/s (6 mph). This gentle breeze contrasts with the more robust winds of previous months, suggesting a hint of calmfulness as nature prepares for the cooler seasons. The trend of decreasing wind speeds from June to September reflects a gradual transition from summer's lively gusts to the more tranquil atmosphere of autumn. However, as October approaches, anticipation builds for a resurgence, with the average wind speed expected to rise to 4.1 m/s (9 mph), reviving the lively charm that Bremen is known for.

Average September Wind Speed in Bremen

The chart displays monthly wind speed patterns in Bremen, 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.
JanFebMarAprMayJunJulAugSepOctNovDec3.73.63.83.53.72.53.03.42.9 m/s4.13.53.7
Data source: Bremen September wind data, generated using information from the Copernicus Climate Change Service.

How September Weather in Bremen Compares to Other Months

The weather in Bremen changes throughout the year, offering a unique experience in each season. Below is a month-by-month comparison of September's weather with other months, highlighting differences in temperature, precipitation, and other key factors. Click on each section to discover seasonal trends in Bremen and find detailed weather information for every month.

September typically experiences a wider temperature range, with minimums around 3°C (38°F) and highs reaching up to 31°C (89°F), resulting in an average temperature of 15°C (59°F). In contrast, January's weather is much colder, with temperatures ranging from a minimum of -10°C (15°F) to a maximum of 14°C (57°F), giving it a significantly lower average of 3°C (38°F). While both months see considerable precipitation, September averages 54 mm over about 10 days, whereas January has slightly more precipitation at 61 mm, spread over 13 days. The humidity levels are also quite high in both months, with January reaching 91% and September at 81%. For more detailed information, you can visit Bremen weather in January.

In September, weather conditions tend to be warmer, with temperatures ranging from a chilly 3°C (38°F) at night to a pleasantly warm 31°C (89°F) during the day, along with an average temperature of 15°C (59°F). The month experiences about 54 mm (2.1 in) of precipitation over approximately 10 days, with humidity levels around 81%. In contrast, February brings much colder temperatures, with lows plummeting to -15°C (5°F) and daytime highs averaging only 18°C (65°F), leading to an average of 4°C (39°F). Despite slightly higher precipitation at 60 mm (2.4 in) across about 12 days, humidity is higher at 89%. For more information, you can check the detailed forecast at Bremen weather in February.

In comparing the weather of September and March, notable differences emerge in temperature and conditions. September boasts a much warmer average temperature of 15°C (59°F), with highs reaching up to 31°C (89°F), while March is significantly cooler, with an average of just 6°C (43°F) and minimum temperatures dipping to -12°C (11°F). While both months experience precipitation—54 mm (2.1 in) in September and 64 mm (2.5 in) in March—the number of rainy days is similar, with September seeing rain on 10 days compared to March's 11 days. Humidity tends to be slightly higher in March at 87%, compared to 81% in September. For more details, you can check Bremen weather in March.

September and April present contrasting weather patterns. In September, temperatures range from a cool 3°C (38°F) to a warm 31°C (89°F), with an average of 15°C (59°F). The month experiences a total of 54 mm (2.1 in) of precipitation over approximately 10 days, alongside a humidity level of 81%. In contrast, April's temperatures are generally lower, with a minimum of -4°C (25°F) and a maximum of 26°C (80°F), averaging at 9°C (48°F). The precipitation in April is slightly less at 49 mm (1.9 in), occurring over about 9 days, and humidity is marginally higher at 82%. For more detailed information on April weather, visit Bremen weather in April.

In comparing the weather between September and May, we see distinct differences in temperature and humidity. September boasts a warmer average temperature of 15°C (59°F) with highs reaching up to 31°C (89°F), while May has a slightly cooler average of 13°C (56°F) and can peak at 32°C (90°F). Interestingly, May experiences colder nights, with minimum temperatures dipping to -1°C (30°F), compared to September's milder minimum of 3°C (38°F). Additionally, while both months see a fair amount of precipitation, September has an average of 54 mm (2.1 in) over about 10 days, while May has slightly more at 58 mm (2.3 in) over 12 days, yet with lower humidity of 73% compared to September's 81%. For more detailed information, you can check out Bremen weather in May.

September and June present distinct weather patterns, reflecting the transition from summer to autumn. In June, the temperatures are generally warmer, with average highs reaching 33°C (92°F) compared to September's peak of 31°C (89°F). However, September showcases a slightly broader range, with minimum temperatures dropping to 3°C (38°F), whereas June begins at a higher minimum of 5°C (41°F). Precipitation is more pronounced in June, totaling 75 mm (2.9 in) over 10 days, while September sees less rainfall at 54 mm (2.1 in) across the same number of days. Additionally, humidity levels are higher in September at 81%, compared to June's 66%. For those interested in further insights about June weather, check the detailed information here: Bremen weather in June.

When comparing the weather in September and July, it's evident that July tends to be warmer overall. With minimum temperatures starting at 7°C (45°F) and highs reaching 37°C (99°F), July offers an average temperature of 18°C (65°F). In contrast, September's temperatures are cooler, with lows of 3°C (38°F) and maxes hitting 31°C (89°F), resulting in an average temperature of 15°C (59°F). Additionally, July experiences more precipitation, totaling 74 mm (2.9 in) over 14 days, compared to September's 54 mm (2.1 in) over 10 days. Notably, July also has lower humidity levels at 66%, while September sees a higher humidity of 81%. For more details on July weather, you can check Bremen weather in July.

September weather brings cooler temperatures compared to August, featuring a minimum of 3°C (38°F) and an average of 15°C (59°F), while August enjoys a milder minimum of 6°C (43°F) and an average of 19°C (66°F). The maximum temperatures in September peak at 31°C (89°F), which is slightly lower than August’s maximum of 35°C (96°F). Additionally, September experiences more precipitation with 54 mm (2.1 in) over 10 days, compared to August's 77 mm (3.0 in) spread over 14 days. Interestingly, September also has higher humidity levels at 81%, contrasting with August’s 67%. For more details on August weather, check out Bremen weather in August.

September and October present a noticeable shift in weather conditions. In September, temperatures range from a mild 3°C (38°F) at night to a warm 31°C (89°F) during the day, with an average of 15°C (59°F). The month sees moderate rainfall, totaling 54 mm (2.1 in) over about 10 days, with humidity levels at 81%. In contrast, October experiences cooler temperatures, with nighttime lows dipping to -4°C (26°F) and daytime highs reaching 27°C (81°F). The average temperature decreases to 12°C (53°F). Additionally, October is wetter, accumulating 87 mm (3.4 in) of precipitation over around 14 days, accompanied by a slight increase in humidity to 86%. For more detailed insights, check Bremen weather in October.

In September, the weather is warm and variable, with temperatures ranging from a brisk 3°C (38°F) at night to a balmy high of 31°C (89°F) during the day, averaging around 15°C (59°F). The month sees around 54 mm (2.1 in) of precipitation over approximately 10 days, with humidity levels at 81%, making it feel quite humid for late summer.

In contrast, November brings a noticeable chill, with temperatures dipping to a minimum of -3°C (27°F) and peaking at 19°C (67°F), averaging 7°C (45°F). Although November receives slightly less rainfall at 49 mm (1.9 in) across about 12 days, the humidity increases to 90%, contributing to a damp and crisp atmosphere. For more detailed weather insights, check out Bremen weather in November.

In September, the weather is generally mild, with temperatures ranging from a minimum of 3°C (38°F) to a maximum of 31°C (89°F), averaging around 15°C (59°F). This month experiences moderate precipitation at 54 mm (2.1 in) over about 10 days, with humidity levels at 81%. In contrast, December brings a significant drop in temperature, with lows reaching -9°C (15°F) and highs averaging just 5°C (41°F), peaking at 14°C (57°F). Precipitation increases to 76 mm (3.0 in) spread over 15 days, and humidity rises to 90%. Such a shift indicates a notable transition from the warmth of early fall to the chill of winter, as winter conditions set in. For a more detailed overview, you can check Bremen weather in December.

Compare Bremen's Climate with Cities Worldwide

Conclusion: What to Expect From September Weather in Bremen

As summer gives way to autumn, September in Bremen showcases a dynamic shift in weather. With average temperatures settling around a mild 15°C (59°F), the month can occasionally surprise with warmth, peaking at 31°C (89°F), yet also brings brisker days, dipping to 3°C (38°F). Rainfall is moderately spread, with about 54 mm (2.1 in) accumulated over roughly 10 days, and humidity remains relatively high at 81%. This combination of cooler nights and occasional warm days offers a unique charm, making September a transitional month that beautifully bridges the warmth of summer with the crispness of fall. For a deeper understanding of what to expect throughout the seasons, explore the detailed insights on Bremen Climate.