September Weather in Baltrum, Germany

Last updated: February 26, 2025

In September, Baltrum, Germany experiences a delightful transition into autumn, with maximum temperatures reaching up to 25°C (77°F) and an average of 16°C (61°F), offering a mild and enjoyable climate. However, the island also sees a minimum temperature of 11°C (51°F), reminding visitors to pack accordingly. With precipitation amounting to 92 mm (3.6 in) over 13 days, the month brings a refreshing blend of sunshine and occasional showers, contributing to the region's lush scenery. Humidity levels hover around 83%, creating a pleasantly crisp atmosphere that is perfect for exploring the island's natural beauty. Baltrum in September promises a captivating experience for those seeking the charm of early autumn by the sea.

September Temperature in Baltrum

In September, Baltrum, Germany, welcomes the early whispers of autumn, with temperatures comfortably ranging from a minimum of 11°C (51°F) to a maximum of 25°C (77°F). This month sees an average temperature of around 16°C (61°F), marking a gentle transition from the warmth of summer. As the days begin to shorten, the balmy evenings linger, providing a perfect backdrop for outdoor activities. The pleasant climate is a stark contrast to the biting cold of winter that follows, making September an inviting time for visitors to experience the island’s charm before it retreats into the chill of October.

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

The chart illustrates September temperature patterns in Baltrum, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends.
JanFebMarAprMayJunJulAugSepOctNovDec414042465260636561554743
Data source: Temperature data for Baltrum generated using information from the Copernicus Climate Change Service.
Choose your preferred temperature unit
The average of daily temperatures (24 hours) calculated across all days in the month.

September Precipitation in Baltrum

In September, Baltrum experiences a notable precipitation level of 92 mm (3.6 in) over 13 days, marking a continuation of a wetter season following August's peak of 108 mm (4.3 in). This time of year, while still relatively humid, transitions towards the heavier rainfall seen in October with 121 mm (4.7 in). The consistent increase in precipitation from the drier months earlier in the year, such as April's 44 mm and May's 54 mm, highlights a shift towards the autumn pattern, characterized by middle-of-the-road temperatures and frequent rain. Overall, September serves as a bridge, gently ushering in the wetter months while still retaining some warmth from summer, making it a dynamic time for Baltrum’s weather.

September Precipitation Trends in Baltrum

The chart displays monthly precipitation patterns in Baltrum, 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.
JanFebMarAprMayJunJulAugSepOctNovDec77727144546789108921217795
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
Choose your preferred precipitation unit

September Humidity in Baltrum

In September, Baltrum, Germany, experiences a significant shift in humidity levels, with an average of 83%. This marks a slight increase from the drier summer months of July and August, which maintain a consistent 75% humidity. Overall, the trend throughout the year showcases a gradual decline in moisture levels from the chilly, damp conditions of January and February—both at 88%—to the more balanced levels seen in late summer and early fall. As autumn approaches, humidity levels begin to rise again, hinting at the return of cooler, wetter weather typical of the region. This cyclical pattern underscores Baltrum's distinctive climate, where high humidity tends to dominate the cooler months.

September Average Humidity in Baltrum

This chart illustrates the average monthly humidity levels in Baltrum, 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.
JanFebMarAprMayJunJulAugSepOctNovDec88%88%86%84%80%75%75%75%83%86%87%86%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Baltrum

As summer wanes, Baltrum, Germany experiences a noticeable shift in its UV Index during September, with a moderate level of 5. This decrease from the peak intensity seen in the height of summer—where UV Index values reached as high as 8—indicates a more manageable sun exposure situation. With a burn time of 30 minutes, it remains essential to take precautions, especially as outdoor activities continue to entice residents and visitors alike. September's UV Index reflects the gradual transition into autumn while maintaining a comfortable balance for sun lovers. Stay informed and protect your skin with the latest updates on the Baltrum UV Index.

Maximum UV Index Levels in Baltrum for September

The chart shows the monthly maximum UV Index (UVI) for Baltrum 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: Baltrum 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 Baltrum

In Baltrum, Germany, September offers a delightful blend of summer's warmth and the crispness of autumn, boasting 316 hours of sunshine. This month showcases a slight decline from the sun-drenched heights of summer, peaking in July with an impressive 418 hours. As the days shorten, September serves as a gentle reminder of the upcoming colder months, following a vibrant summer where sunshine flourished with 412 hours in May and 407 hours in June. The cooler transition into October, with its 245 hours of sunlight, sets the stage for a cozy autumn, but September remains a cherished golden hour, bridging the sunlit joys of summer with the serene beauty of fall.

Monthly Sunshine Duration in Baltrum: September Highlighted

The September sunshine duration represents the total number of hours Baltrum 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.
JanFebMarAprMayJunJulAugSepOctNovDec100h195h281h359h412h407h418h394h316h245h182h129h
Data source: Baltrum September Sunshine duration data generated using information from the Copernicus Climate Change Service.

Chance of Sun in Baltrum During September

In September, Baltrum, Germany experiences a 33% chance of sunny weather, maintaining a trend that is typical for the late summer months. This percentage reflects a slight decrease compared to the sunnier months of April (46%) and May (30%), highlighting the seasonal transition as fall approaches. Interestingly, as summer wanes, the likelihood of sunny days remains more favorable than autumn months like October (28%) and November (19%). Thus, visitors can still expect pleasant sunny spells in September, making it a lovely time to enjoy the island's natural beauty before winter sets in.

Percentage of Sunny Days in September in Baltrum

The chart illustrates the percentage of sunny days in Baltrum 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 Baltrum experiences clear skies throughout the year.
JanFebMarAprMayJunJulAugSepOctNovDec22%25%36%46%30%39%33%35%33%28%19%21%
Data source: Baltrum September chance of sun data, generated using information from the Copernicus Climate Change Service.

Daylight Hours in Baltrum in September

As summer wanes, September in Baltrum, Germany, welcomes a gentle transition from the vibrant long days of July and August to the shorter daylight hours of autumn. With approximately 12 hours of daylight, this month marks a noticeable decline as the days begin to shorten, yet still offers plenty of sunshine for outdoor activities. The gradual decrease from a peak of 16 hours in the height of summer reflects the changing seasons, inviting a sense of change and tranquility. With fall's arrival on the horizon, September serves as a bridge, blending the warmth of summer's glow with the crispness of the forthcoming months.

Average Daylight Hours in Baltrum for September

The chart illustrates the variation in daylight duration in Baltrum throughout the year, with September highlighted. It shows the monthly changes in daylight hours, calculated by summing the hours between sunrise and sunset.
JanFebMarAprMayJunJulAugSepOctNovDec8h 4m9h 48m11h 54m14h 3m15h 57m16h 57m16h 25m14h 42m12h 37m10h 29m8h 34m7h 31m
Data source: Baltrum daylight hours, calculated by summing the hours between sunrise and sunset for each day.

September Winds in Baltrum

As September unfolds in Baltrum, Germany, the average wind speed settles at a gentle 5.5 m/s (12 mph), marking a transition from the brisk summer breezes of August. This slight dip in wind intensity reflects the shift toward the milder autumn months, where the winds tend to calm after a peak in May and June. Interestingly, September's breezes are a precursor to an increase in windiness as the colder months approach, with October poised to bring a more invigorating 7.9 m/s (18 mph). Overall, the wind patterns in Baltrum not only enhance its coastal charm but also signal the seasonal rhythms experienced by its inhabitants and visitors alike.

Average September Wind Speed in Baltrum

The chart displays monthly wind speed patterns in Baltrum, 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.
JanFebMarAprMayJunJulAugSepOctNovDec6.97.36.76.86.04.65.36.65.5 m/s7.97.07.0
Data source: Baltrum September wind data, generated using information from the Copernicus Climate Change Service.

How September Weather in Baltrum Compares to Other Months

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

September and January present strikingly different weather patterns. September enjoys a milder climate, with average temperatures ranging from a minimum of 11°C (51°F) to a maximum of 25°C (77°F), complemented by higher humidity levels at 83%. In contrast, January experiences much colder temperatures, with averages plummeting to a minimum of -4°C (25°F) and a maximum of only 11°C (52°F). Both months see notable rainfall, though September receives slightly more at 92 mm (3.6 in) over 13 days compared to January's 77 mm (3.0 in) over 15 days. For more information, check out Baltrum weather in January.

In September, temperatures are notably milder, with averages around 16°C (61°F) and highs reaching up to 25°C (77°F), while February experiences much chillier conditions, with average temperatures dropping to just 4°C (40°F) and maximums of 12°C (54°F). Precipitation levels are relatively similar in both months, with September receiving 92 mm (3.6 in) over 13 days and February slightly less at 72 mm (2.8 in), yet both months experience the same number of rainy days. Additionally, humidity is higher in February at 88%, compared to September's 83%, contributing to a crisp, cold atmosphere during the winter month. For a detailed look at February’s weather patterns, check out Baltrum weather in February.

September and March present contrasting weather patterns. In September, temperatures are significantly milder, with an average of 16°C (61°F) and highs reaching up to 25°C (77°F), making it a more pleasant month. However, it also brings higher precipitation, averaging 92 mm (3.6 in) over 13 days, coupled with a humidity level of 83%. In contrast, March is much colder, with an average temperature of just 5°C (42°F) and maximums only reaching 13°C (56°F). The month sees less precipitation, totaling 71 mm (2.8 in) over 12 days, but has a slightly higher humidity level at 86%. For more detailed insights, visit Baltrum weather in March.

When comparing the weather in September and April, notable differences emerge in temperature and precipitation levels. September tends to be warmer, with average temperatures ranging from a minimum of 11°C (51°F) to a maximum of 25°C (77°F), while April is cooler, with temperatures fluctuating between 2°C (35°F) and 17°C (63°F). Additionally, September experiences more rainfall, with a total of 92 mm (3.6 in) spread over 13 days, compared to April’s 44 mm (1.7 in) over just 9 days. Both months have similar humidity levels, hovering around 83% in September and 84% in April. For more detailed insights, you can check Baltrum weather in April.

September weather is generally milder and wetter compared to May. With average temperatures ranging from a minimum of 11°C (51°F) to a maximum of 25°C (77°F), September offers warmer days but also sees higher precipitation levels, averaging 92 mm (3.6 in) over 13 rainy days and maintaining a humidity level of 83%. In contrast, May features cooler conditions with temperatures that range from a minimum of 4°C (40°F) to a maximum of 21°C (70°F). Although May experiences less rainfall, averaging 54 mm (2.1 in) over 12 days, the overall humidity is slightly lower at 80%. For a more detailed overview, you can check out Baltrum weather in May.

In comparing the weather of September and June, both months display similar average temperatures, hovering around 16°C (61°F). However, September tends to be slightly warmer with maximum temperatures reaching 25°C (77°F), while June also peaks at 25°C (78°F). Precipitation is more frequent in September, with 92 mm (3.6 in) recorded over 13 days, compared to June's 67 mm (2.6 in) over 11 days. Additionally, September exhibits higher humidity levels at 83%, compared to June's 75%. For a detailed look at June's weather conditions, you can visit Baltrum weather in June.

When comparing the weather in September and July, we notice that September tends to be slightly cooler, with average temperatures ranging from a minimum of 11°C (51°F) to a maximum of 25°C (77°F), as opposed to July's warmer range of 13°C (55°F) to 26°C (80°F). Both months experience similar levels of precipitation, with September receiving 92 mm (3.6 in) and July slightly less at 89 mm (3.5 in), both spread over 13 rainy days. Additionally, September has a higher humidity level at 83%, compared to July's 75%, contributing to a more muggy feel during the month. For a more detailed overview, you can check the specifics at Baltrum weather in July.

In comparing the weather between September and August, September tends to have slightly cooler temperatures, with a minimum of 11°C compared to August's 13°C. The average temperature in September is also lower at 16°C, while August averages 18°C. Interestingly, both months see a maximum temperature reaching around 25°C. Precipitation levels are a bit lower in September, with 92 mm over 13 days, as opposed to August’s 108 mm over 17 days. Additionally, September experiences higher humidity at 83%, compared to 75% in August. For a more detailed look at August weather, you can check out Baltrum weather in August.

September typically experiences warmer temperatures, with an average of 16°C (61°F) and a maximum reaching up to 25°C (77°F), while October sees a drop in temperatures, averaging 13°C (55°F) and peaking at 21°C (71°F). Precipitation increases in October, with 121 mm (4.7 in) over 18 days compared to September’s 92 mm (3.6 in) over 13 days. Humidity slightly rises as well, from 83% in September to 86% in October. For a detailed look at the weather specifics, you can check out Baltrum weather in October.

September and November present notable differences in weather patterns. In September, temperatures range from a minimum of 11°C (51°F) to a maximum of 25°C (77°F), with an average temperature of 16°C (61°F). The month experiences moderate precipitation, totaling 92 mm (3.6 in) over 13 days, and humidity levels are relatively high at 83%. In contrast, November sees a significant drop in temperatures, with a minimum of 1°C (34°F) and an average of 9°C (48°F), while the maximum only reaches 17°C (62°F). Although the total precipitation is slightly lower at 77 mm (3.0 in), it occurs over more days, with 17 days of rain contributing to an even higher humidity level of 87%. For more detailed insights, you can explore Baltrum weather in November.

September and December present stark contrasts in weather conditions. In September, temperatures range from a mild 11°C (51°F) to a comfortable 25°C (77°F), with an average of 16°C (61°F). This month experiences significant rainfall, totaling 92 mm (3.6 in) over approximately 13 days, alongside a high humidity level of 83%. In contrast, December brings a chillier climate, with temperatures dipping as low as -2°C (29°F) and peaking at just 11°C (52°F), averaging at 6°C (43°F). While precipitation sees a slight increase to 95 mm (3.8 in) spread over 18 days, humidity also rises modestly to 86%. For those interested in more specific details about winter weather, check out Baltrum weather in December.

Compare Baltrum's Climate with Cities Worldwide

Conclusion: What to Expect From September Weather in Baltrum

As summer gently transitions into autumn, September in Baltrum offers a unique blend of mild temperatures and refreshing coastal breezes. With an average warmth that hovers around a comfortable 16°C, the island welcomes cooler days, making it a perfect time for scenic walks along the shore. While rain is more frequent, with 13 days of precipitation, the landscape flourishes with lush greenery, contrasting beautifully against the seaside backdrop. The humidity levels may feel higher, yet they contribute to the enchanting atmosphere that characterizes this time of year. For detailed insights on the island's climate throughout the year, explore Baltrum Climate.