September Weather in Bremerhaven, Germany

Last updated: February 26, 2025

In Bremerhaven, Germany, September presents a unique blend of weather characteristics that define the transition into autumn. With a maximum temperature reaching 28°C (83°F) and an average of 15°C (59°F), the month gradually shifts to cooler days, where the minimum temperature can drop to 6°C (43°F). Visitors should prepare for occasional rain, as the city experiences approximately 57 mm (2.3 in) of precipitation across 11 days. The air is often humid, lingering around 81%, creating a vibrant atmosphere as the summer warmth gives way to the crispness of fall. Whether you're exploring the waterfront or enjoying local attractions, September in Bremerhaven offers a captivating weather experience.

September Temperature in Bremerhaven

In September, Bremerhaven begins to transition from the warmth of summer to the coolness of autumn. With daytime temperatures ranging from a pleasant 15°C (59°F) on average, peaking at a comfortable 28°C (83°F), the weather remains inviting for outdoor activities. However, the nights start to cool down, dipping to a minimum of 6°C (43°F), signaling the approach of fall. This month showcases a delightful blend of lingering summer warmth and the crispness of autumn, making it a perfect time to explore the scenic beauty of this coastal city. As the days grow shorter, the charm of Bremerhaven in September captivates visitors with its mild temperatures and stunning sunsets.

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

The chart illustrates September temperature patterns in Bremerhaven, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends.
JanFebMarAprMayJunJulAugSepOctNovDec383942485563646559534540
Data source: Temperature data for Bremerhaven 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 Bremerhaven

In September, Bremerhaven experiences a shift in precipitation patterns, with an average of 57 mm (2.3 in) of rain over approximately 11 days. This marks a decrease from the wetter months of July and August, which typically see rainfall amounts peaking at 80 mm (3.1 in) and 86 mm (3.4 in) respectively. The transition into autumn is evident as the cumulative rainfall starts to decline, though it maintains a healthy presence in the early fall. As temperatures begin to cool, September offers a slightly drier respite before the more substantial rains of October, which often brings 91 mm (3.6 in). Overall, this month serves as a gentle precursor to the wetter season ahead, with its moderate precipitation and a mix of lingering warmth—a perfect time for enjoying the early autumn scenery in this coastal city.

September Precipitation Trends in Bremerhaven

The chart displays monthly precipitation patterns in Bremerhaven, 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.
JanFebMarAprMayJunJulAugSepOctNovDec656167546578808657915676
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Bremerhaven

In Bremerhaven, Germany, September experiences a notable shift in humidity, settling at 81%. This is a significant rise from the summer months, where humidity was notably lower at around 66% in both June and July. As the warmth of summer gives way to the onset of autumn, humidity begins to climb again. This trend continues through October, reaching 86%, and further into winter, where levels peak at 90% in both November and December. Thus, September marks a transitional period, as the lingering warmth draws to a close and the air begins to thicken with moisture, preparing for the wetter months ahead.

September Average Humidity in Bremerhaven

This chart illustrates the average monthly humidity levels in Bremerhaven, 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 Bremerhaven

As summer transitions to autumn in Bremerhaven, Germany, the UV Index takes a downward turn in September, settling at a moderate level of 5. This marks a shift from the high and very high indices seen in the previous months of June, July, and August, where sun-seekers had to be particularly cautious with a burn time as short as 15 minutes. With the UV Index now resulting in a burn time of 30 minutes, outdoor enthusiasts can enjoy the fresh fall air with a bit more time under the sun, though caution is still advised. As the days grow shorter, it's a reminder to stay mindful of UV exposure even as the temperatures cool. For more detailed insights on UV levels throughout the year, visit Bremerhaven UV Index.

Maximum UV Index Levels in Bremerhaven for September

The chart shows the monthly maximum UV Index (UVI) for Bremerhaven 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.
JanFebMarAprMayJunJulAugSepOctNovDec123578775321
Data source: Bremerhaven 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 Bremerhaven

As summer begins to fade, September in Bremerhaven, Germany, offers a delightful transition with an impressive 311 hours of sunshine. This month stands out as a sweet continuation of the sunny season, notably following July's peak of 414 hours and August's generous 389 hours. While the daylight hours may begin to wane as autumn approaches, September still showcases a significant amount of bright weather, contributing to a total reminiscent of the spring months—yet distinctly warmer. As nature's vibrant colors start to shift, the lingering sunshine creates an inviting atmosphere for outdoor activities and leisurely strolls along the waterfront, allowing residents and visitors alike to savor the last golden rays of summer.

Monthly Sunshine Duration in Bremerhaven: September Highlighted

The September sunshine duration represents the total number of hours Bremerhaven 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.
JanFebMarAprMayJunJulAugSepOctNovDec102h187h270h357h406h408h414h389h311h240h172h116h
Data source: Bremerhaven September Sunshine duration data generated using information from the Copernicus Climate Change Service.

Chance of Sun in Bremerhaven During September

In September, Bremerhaven, Germany, experiences a 30% chance of sunny weather, which marks a slight decline from the warmer months of summer. Notably, this percentage remains consistent with August's 31%, suggesting that while the month transitions into autumn, there’s still a respectable amount of sunshine to enjoy. The trend in sunlit days throughout the year indicates a peak in late spring, with April reaching 41%, before gradually decreasing through the summer months. As the year progresses into October, the likelihood of sunshine further dips to 27%, highlighting September as a brief window where residents and visitors can still soak up some rays before fall settles in. Overall, while sunny days might be fewer, September offers a delightful balance of gentle warmth and a hint of autumn's charm.

Percentage of Sunny Days in September in Bremerhaven

The chart illustrates the percentage of sunny days in Bremerhaven 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 Bremerhaven experiences clear skies throughout the year.
JanFebMarAprMayJunJulAugSepOctNovDec16%27%35%41%26%33%30%31%30%27%17%18%
Data source: Bremerhaven September chance of sun data, generated using information from the Copernicus Climate Change Service.

Daylight Hours in Bremerhaven in September

As autumn approaches, September in Bremerhaven, Germany, marks a noticeable shift in daylight hours, offering around 12 hours of light. This decline follows the peak of summer in July and June, when days stretch to a generous 16 hours. While the increase from 8 hours in January to 15 hours in May captures the growing intensity of spring and summer, the gradual tapering in September foreshadows the shorter days of fall. The transition is smooth, with September still enjoying a fair share of daylight compared to the dwindling hours that December will bring, when just 7 hours of daylight remain. This rhythm of light and dark not only defines the seasons but also shapes the experiences of those who inhabit this vibrant coastal city.

Average Daylight Hours in Bremerhaven for September

The chart illustrates the variation in daylight duration in Bremerhaven throughout the year, with September highlighted. It shows the monthly changes in daylight hours, calculated by summing the hours between sunrise and sunset.
JanFebMarAprMayJunJulAugSepOctNovDec8h 5m9h 48m11h 54m14h 2m15h 56m16h 55m16h 23m14h 41m12h 37m10h 30m8h 34m7h 32m
Data source: Bremerhaven daylight hours, calculated by summing the hours between sunrise and sunset for each day.

September Winds in Bremerhaven

As the summer winds down, September in Bremerhaven presents a noticeable shift in wind patterns, with an average speed of 3.3 m/s (7 mph). This marks a dip from the slightly breezier months of August and July, reflecting a seasonal transition towards calmer conditions. Looking at the year overall, September's gentle breeze is among the softest, following the holiday bustle of summer. However, the increase in wind speeds that typically emerges in October looms on the horizon, suggesting that while September may usher in a serene ambiance, the vibrant gusts of autumn are just around the corner, inviting moments of introspection or leisurely strolls along the waterfront.

Average September Wind Speed in Bremerhaven

The chart displays monthly wind speed patterns in Bremerhaven, 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.
JanFebMarAprMayJunJulAugSepOctNovDec4.24.34.44.24.13.03.53.93.3 m/s4.74.04.2
Data source: Bremerhaven September wind data, generated using information from the Copernicus Climate Change Service.

How September Weather in Bremerhaven Compares to Other Months

The weather in Bremerhaven 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 Bremerhaven and find detailed weather information for every month.

September and January present strikingly different weather conditions. In September, temperatures range from a mild 6°C (43°F) at night to a warm 28°C (83°F) during the day, with an average of 15°C (59°F). The month sees moderate rainfall with 57 mm (2.3 in) over about 11 days and a humidity level of 81%. In contrast, January is much colder, with temperatures dropping to a minimum of -7°C (19°F) and a maximum of just 13°C (56°F), averaging around 4°C (39°F). Additionally, January experiences slightly more precipitation at 64 mm (2.5 in) over about 13 days, accompanied by higher humidity at 91%. For more detailed insights on January weather, you can refer to Bremerhaven weather in January.

September and February present striking contrasts in weather. In September, temperatures range from a mild 6°C (43°F) at night to a warm 28°C (83°F) during the day, with an average of 15°C (59°F). The humidity is relatively high at 81%, and rainfall of 57 mm (2.3 in) occurs across about 11 days. Conversely, February experiences much colder temperatures, with a minimum of -11°C (12°F) and a maximum of 16°C (61°F), leading to a chilling average of 4°C (39°F). Despite slightly higher precipitation at 61 mm (2.4 in) and the same number of rainy days (11), the humidity in February is even higher at 89%. For a more detailed look at February conditions, you can refer to Bremerhaven weather in February.

In September, the weather in Bremerhaven typically features a comfortable average temperature of 15°C (59°F), with maximum temperatures reaching up to 28°C (83°F), making it a pleasant month overall. However, it also experiences notable humidity at 81% and sees around 57 mm (2.3 in) of precipitation over approximately 11 days. In contrast, March brings cooler conditions, with average temperatures dropping to around 6°C (42°F) and minimums plunging to -11°C (13°F). While March has slightly higher precipitation at 67 mm (2.6 in) over 13 days, the humidity also increases to 87%. For a detailed overview of March weather, you can check Bremerhaven weather in March.

When comparing the weather in September and April, notable differences emerge. September boasts warmer temperatures, with a minimum of 6°C (43°F) and an average of 15°C (59°F), peaking at a comfortable 28°C (83°F). In contrast, April experiences cooler conditions, starting at a minimum of -1°C (30°F) and averaging 9°C (48°F), while the maximum temperature reaches only 24°C (76°F). Precipitation levels are similar, with September receiving 57 mm (2.3 in) and April slightly less at 54 mm (2.1 in), both occurring over approximately 11 days. Humidity levels remain relatively high in both months, with September at 81% and April at 82%. For more detailed insights, check out Bremerhaven weather in April.

In comparing the weather of September and May, we find notable differences in temperature and precipitation patterns. September boasts a wider temperature range, with minimums of 6°C (43°F) and maximums reaching up to 28°C (83°F) on average, while May starts off cooler, with minimums around 3°C (38°F) and max temperatures peaking at 30°C (86°F). Precipitation is also slightly higher in May at 65 mm (2.6 in) over 12 days, compared to September's 57 mm (2.3 in) over 11 days. Additionally, humidity levels are notably higher in September at 81% compared to 73% in May, resulting in a generally more humid atmosphere in the early autumn. For more specifics about May weather, you can check Bremerhaven weather in May.

When comparing the weather in September and June, we see notable differences in temperature and precipitation levels. September typically experiences a minimum temperature of 6°C (43°F), an average of 15°C (59°F), and a maximum of 28°C (83°F), accompanied by 57 mm (2.3 in) of precipitation spread over 11 days and a relatively high humidity of 81%. In contrast, June boasts slightly milder conditions with minimum temperatures around 7°C (46°F), an average of 17°C (64°F), and maximum temperatures peaking at 32°C (89°F). June also sees a higher precipitation level of 78 mm (3.1 in) over the same 11 days but with significantly lower humidity at 66%. For more details on June weather patterns, you can check Bremerhaven weather in June.

In comparing the weather between September and July, we see distinct differences in temperature and precipitation patterns. September experiences a lower temperature range, with minimums around 6°C (43°F) and maximums reaching 28°C (83°F), while July boasts milder lows of 10°C (50°F) and highs peaking at 33°C (91°F). Additionally, September has a higher average humidity of 81% compared to July's 66%. Precipitation is slightly lower in September, with 57 mm (2.3 in) over 11 days, whereas July sees more rainfall at 80 mm (3.1 in) over 13 days. For a closer look at July's conditions, you can refer to Bremerhaven weather in July.

In comparing the weather of September and August, September tends to be cooler and wetter. While August offers warmer temperatures with a minimum of 9°C (49°F) and an average of 18°C (65°F), September features lower temperatures, with a minimum of 6°C (43°F) and an average of 15°C (59°F). Additionally, August experiences higher maximum temperatures, reaching 31°C (88°F), compared to September's peak of 28°C (83°F). Precipitation also differs between the two months, with August recording 86 mm (3.4 in) over 14 days, whereas September sees slightly less rain at 57 mm (2.3 in) but spread across 11 days. Humidity levels are higher in September at 81%, compared to August's 67%. For more detailed information, check Bremerhaven weather in August.

September and October present a notable shift in weather conditions. In September, temperatures typically range from a mild minimum of 6°C (43°F) to a warm maximum of 28°C (83°F), with an average of 15°C (59°F). The month experiences about 57 mm (2.3 in) of precipitation over 11 days, coupled with a relative humidity of 81%. In contrast, October sees a drop in the minimum temperature to -1°C (30°F), with an average of 12°C (53°F) and a maximum of 24°C (76°F). Precipitation increases to 91 mm (3.6 in) over 14 days, and humidity rises slightly to 86%. This transition reflects the onset of autumn, as indicated in more detail in the Bremerhaven weather in October.

September and November present a stark contrast in weather conditions. September boasts a milder climate, with temperatures ranging from a minimum of 6°C (43°F) to a maximum of 28°C (83°F) and an average of 15°C (59°F). The month experiences about 57 mm (2.3 in) of precipitation over 11 days, accompanied by a relatively moderate humidity of 81%. In contrast, November ushers in cooler temperatures, with a chilling minimum of -2°C (29°F) and an average of 7°C (45°F), peaking at 18°C (65°F). The month sees a similar amount of rainfall at 56 mm (2.2 in) over 12 days, but the humidity rises to 90%, making it feel much colder. For more detailed information, you can check Bremerhaven weather in November.

In September, the weather is generally milder, with temperatures ranging from a minimum of 6°C (43°F) to a maximum of 28°C (83°F) and an average of 15°C (59°F). This month experiences approximately 57 mm (2.3 in) of precipitation over 11 days, making for a comfortable outdoor environment with 81% humidity. In contrast, December brings a significant drop in temperatures, with a minimum of -8°C (17°F) and a maximum of 12°C (54°F), resulting in an average temperature of just 5°C (41°F). December sees a higher precipitation level of 76 mm (3.0 in) over 16 days, along with increased humidity at 90%. For a closer look at the weather specifics, visit Bremerhaven weather in December.

Compare Bremerhaven's Climate with Cities Worldwide

Conclusion: What to Expect From September Weather in Bremerhaven

As September settles in, Bremerhaven experiences a noticeable transition from the warmth of summer to the cool embrace of autumn. Though temperatures can peak at a pleasant 28°C, the average dips to a brisk 15°C, inviting a refreshing change that contrasts sharply with the sultry heights of July and August. Rainfall is also more frequent, with approximately 57 mm spread over 11 days, making it a month where umbrella usage becomes essential. With an increased humidity level of 81%, the air feels richer, adding to the character of the season. For those looking to understand more about how September fits into the broader climatic patterns of the region, you can explore further details at Bremerhaven Climate.