September Weather in Grainau, Germany

Last updated: February 26, 2025

In September, the charming village of Grainau, Germany, experiences a delightful range of temperatures, peaking at a maximum of 24°C (75°F) and dipping to a minimum of -2°C (28°F), with an average of 11°C (53°F). This month sees a generous 158 mm (6.2 in) of precipitation spread across 16 rainy days, contributing to the region's lush landscape. Coupled with a high humidity of 83%, the weather creates a refreshing atmosphere perfect for outdoor adventures and exploring the breathtaking fall foliage that envelops this scenic alpine backdrop.

September Temperature in Grainau

In September, Grainau, Germany begins to transition from the warm embrace of summer to the coolness of autumn. The temperatures showcase this shift, with minimums dipping to -2°C (28°F), signaling the onset of cooler nights. Daytime averages settle at a comfortable 11°C (53°F), making it an ideal time for outdoor adventures amidst stunning fall foliage. The maximum temperatures, reaching up to 24°C (75°F), still offer a taste of lingering warmth, encouraging visitors to savor the beauty of the changing seasons. Overall, September is marked by a delightful blend of crisp air and moderate days, perfect for exploring everything Grainau has to offer.

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

The chart illustrates September temperature patterns in Grainau, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends.
JanFebMarAprMayJunJulAugSepOctNovDec253035434958606052453629
Data source: Temperature data for Grainau 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 Grainau

September in Grainau, Germany, continues the trend of significant precipitation seen throughout the summer months, accumulating 158 mm (6.2 in) over 16 days. This marks a slight decrease from August's peak of 212 mm (8.3 in) but maintains the region's reputation for wet weather as it transitions into autumn. With rainfall remaining robust, this month showcases the lingering influence of summer storms while hinting at the upcoming seasonal shift. As the days grow shorter and cooler, the steady rain contributes to the lush greenery that Grainau is known for, making it a picturesque scene even under cloudy skies.

September Precipitation Trends in Grainau

The chart displays monthly precipitation patterns in Grainau, 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.
JanFebMarAprMayJunJulAugSepOctNovDec10584989319919119921215912385123
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Grainau

In September, Grainau, Germany, experiences a modest rise in humidity with levels at 83%, slightly up from the summer months. This trend reflects the transition into autumn, where humidity values typically increase again as the cooler temperatures set in. While the late summer brought a dip to 80% in August, the September humidity marks a reversion to more substantial moisture in the air, hinting at the approaching chill of autumn. This gradual shift in humidity is characteristic of the seasonal cycle in Grainau, as the year winds down into the wetter months of October and December, both registering higher humidity levels of 90%.

September Average Humidity in Grainau

This chart illustrates the average monthly humidity levels in Grainau, 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.
JanFebMarAprMayJunJulAugSepOctNovDec93%89%86%83%78%79%82%80%83%90%89%90%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Grainau

As September rolls into Grainau, Germany, the UV Index shows a notable decline from the peak summer months, settling at 6 in this transitional month. This places the exposure risk in the high category, with a recommended burn time of 25 minutes for unprotected skin. Unlike the very high levels experienced in July and August, September's index signifies a slight easing, but vigilance remains crucial. As the days shorten and temperatures cool, outdoor enthusiasts should still be aware of the sun's intensity, especially during midday hours. For those planning outdoor activities, understanding these trends is essential for safe sun exposure. Stay informed about the UV Index by visiting Grainau UV Index.

Maximum UV Index Levels in Grainau for September

The chart shows the monthly maximum UV Index (UVI) for Grainau 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.
JanFebMarAprMayJunJulAugSepOctNovDec235789986432
Data source: Grainau 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 Grainau

September in Grainau, Germany, shines brightly with 299 hours of sunshine, marking a notable transition as summer begins to wane. After the sun-soaked peak of July, which boasts an impressive 398 hours, September’s luminosity reflects a gradual descent while still offering delightful days. This month serves as a vibrant bridge, retaining a significant amount of sun compared to the earlier months of the year, with an increase from the bleak winter light seen in January at just 160 hours. As the days grow shorter and autumn approaches, the sunshine continues to linger, providing a warm farewell to summer and inviting residents and visitors alike to bask in the lingering warmth of the season.

Monthly Sunshine Duration in Grainau: September Highlighted

The September sunshine duration represents the total number of hours Grainau 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.
JanFebMarAprMayJunJulAugSepOctNovDec160h225h291h341h346h374h398h359h299h273h219h180h
Data source: Grainau September Sunshine duration data generated using information from the Copernicus Climate Change Service.

Chance of Sun in Grainau During September

September in Grainau, Germany, marks a noticeable uplift in the likelihood of sunny weather, boasting a 45% chance of sunshine that surpasses many previous months. This increase suggests a gradual transition from the summer's peak sunshine days into the gentle embrace of autumn. Compared to the preceding months, like August and July with their 31% and 32% chances respectively, September’s warmth and brightness can be a delightful surprise for visitors and locals alike. As the days grow shorter, this month stands out as a perfect time to enjoy the lingering sun before the cooler autumn weather settles in.

Percentage of Sunny Days in September in Grainau

The chart illustrates the percentage of sunny days in Grainau 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 Grainau experiences clear skies throughout the year.
JanFebMarAprMayJunJulAugSepOctNovDec20%43%42%40%29%35%32%31%45%38%34%33%
Data source: Grainau September chance of sun data, generated using information from the Copernicus Climate Change Service.

Daylight Hours in Grainau in September

As the summer fades in Grainau, Germany, September marks a gentle transition with approximately 12 hours of daylight, a noticeable reduction from August's generous 14 hours. This gradual shortening of days highlights the changing seasons, as daylight hours begin to taper off from their summer peaks. Following a steady climb from January's 8 hours, daylight reached its zenith in the vibrant months of May through July, each basking in 15 hours of light. However, September's decrease signals the onset of autumn, reminding us of nature's rhythm as the days continue to shorten leading into the cooler months of October and November. Embrace the beauty of this month, where the lingering warmth of summer still meets the crispness of fall.

Average Daylight Hours in Grainau for September

The chart illustrates the variation in daylight duration in Grainau throughout the year, with September highlighted. It shows the monthly changes in daylight hours, calculated by summing the hours between sunrise and sunset.
JanFebMarAprMayJunJulAugSepOctNovDec8h 54m10h 15m11h 55m13h 39m15h 8m15h 54m15h 29m14h 10m12h 31m10h 48m9h 16m8h 29m
Data source: Grainau daylight hours, calculated by summing the hours between sunrise and sunset for each day.

September Winds in Grainau

As September graces Grainau, Germany, the gentle whispers of the wind decline to an average speed of 1.3 m/s (3 mph), marking the slowest winds of the year. This subtle decrease reflects a broader trend seen throughout the summer months, where wind speeds gradually taper off from July's peak of 1.4 m/s. The transition into autumn not only brings cooler temperatures but also a serene calmness in the air, encouraging peaceful moments of reflection amidst the stunning alpine backdrop. As the year progresses, particularly in October and November, the winds show a slight resurgence, suggesting a cyclical nature to Grainau's breezes that mirrors the changing seasons.

Average September Wind Speed in Grainau

The chart displays monthly wind speed patterns in Grainau, 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.
JanFebMarAprMayJunJulAugSepOctNovDec1.81.61.61.61.71.51.41.41.3 m/s1.51.41.7
Data source: Grainau September wind data, generated using information from the Copernicus Climate Change Service.

How September Weather in Grainau Compares to Other Months

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

September and January display stark contrasts in weather conditions. In September, temperatures fluctuate between a minimum of -2°C (28°F) and a maximum of 24°C (75°F), with an average of 11°C (53°F). The month experiences significant precipitation, totaling 158 mm (6.2 in) over 16 days, coupled with a moderate humidity of 83%. In contrast, January's chill brings much harsher conditions, with temperatures ranging from a frigid -30°C (-23°F) to a maximum of 11°C (53°F) and an average of -4°C (26°F). This month sees less precipitation, accumulating 105 mm (4.1 in) over 12 days, but humidity remains higher at 93%. For a closer look at January's weather specifics, check out Grainau weather in January.

September and February present stark contrasts in weather. In September, temperatures range from a chilly -2°C (28°F) to a warm 24°C (75°F), with an average of 11°C (53°F), accompanied by relatively high humidity at 83%. This month also sees significant rainfall, totaling 158 mm (6.2 in) over 16 days, contributing to a generally damp atmosphere. In contrast, February is much colder, with temperatures plummeting to a minimum of -25°C (-13°F) and peaking at 14°C (58°F), averaging around -1°C (30°F). This winter month experiences less precipitation, totaling 84 mm (3.3 in) over 12 days, while humidity levels rise slightly to 89%. For a detailed look at February's climate, you can check out Grainau weather in February.

September and March showcase distinct differences in weather patterns. September enjoys a milder temperature range, with minimums around -2°C (28°F) and averages reaching 11°C (53°F), peaking at a pleasant 24°C (75°F). Conversely, March experiences much chillier conditions, with minimum temperatures dropping to -22°C (-7°F) and an average of only 2°C (35°F), although it can rise to a maximum of 17°C (64°F). Both months see precipitation on approximately 16 days, but September receives significantly more rainfall at 158 mm (6.2 in) compared to March's 98 mm (3.9 in). Additionally, humidity levels are slightly higher in March at 86%, compared to 83% in September. For a deeper look at the weather specifics in March, you can visit Grainau weather in March.

September and April present notable contrasts in weather conditions. In September, average temperatures reach a comfortable 11°C (53°F), with highs touching 24°C (75°F) on the warmer days, while precipitation levels are higher at 158 mm (6.2 in) over approximately 16 days. In contrast, April tends to be chillier, with average temperatures around 6°C (43°F) and a maximum of 22°C (71°F). Despite having less total rainfall at 93 mm (3.7 in) over 14 days, April still maintains the same humidity level of 83%. For those seeking more specific insights on April weather, you can refer to this link: Grainau weather in April.

In comparing September and May weather, September generally presents a milder climate with average temperatures around 11°C (53°F) and a maximum of 24°C (75°F), while May has a slightly lower average of 9°C (49°F) but can reach up to 27°C (81°F). In terms of precipitation, September records 158 mm over 16 days, whereas May is wetter, with 199 mm spread across 22 days. Humidity levels in September are higher at 83%, compared to May's 78%. For a detailed view of May weather patterns, you can visit Grainau weather in May.

September and June showcase distinct differences in weather patterns. In September, temperatures range from a chilly minimum of -2°C (28°F) to a comfortable maximum of 24°C (75°F), averaging around 11°C (53°F). The month is characterized by significant rainfall, with 158 mm (6.2 in) of precipitation spread over 16 days and a humidity level of 83%. In contrast, June enjoys warmer temperatures, with a minimum of 1°C (34°F) and a pleasantly warm maximum of 30°C (87°F), averaging 15°C (59°F). However, June tends to be wetter, featuring 191 mm (7.5 in) of rainfall over 19 days and slightly lower humidity at 79%. For more details on the June weather, you can visit Grainau weather in June.

September weather tends to be cooler than July, with minimum temperatures dropping to -2°C (28°F) compared to July's minimum of 6°C (42°F). The average temperature in September is 11°C (53°F), significantly lower than July's average of 15°C (60°F), while maximum temperatures reach 24°C (75°F) in September, contrasted with July's high of 31°C (87°F). Both months experience considerable precipitation, with September receiving 158 mm (6.2 in) over 16 days and July slightly wetter at 199 mm (7.8 in) over 19 days. Humidity levels are similar, with September at 83% and July at 82%. For more details on July weather, visit Grainau weather in July.

In comparing the weather between August and September, we see a notable shift in temperature and precipitation. August typically experiences warmer temperatures, with a minimum of 4°C (40°F), an average of 15°C (60°F), and a maximum of 29°C (85°F). In contrast, September is cooler, featuring a minimum of -2°C (28°F) and a lower average of 11°C (53°F), though it can still reach a maximum of 24°C (75°F).

Precipitation levels are also noteworthy; August sees about 212 mm (8.3 in) of rain over 20 days, while September has 158 mm (6.2 in) spread across 16 days. Humidity remains relatively high in both months, although September's average humidity slightly increases to 83% compared to August's 80%. For more specific insights into August weather, you can visit Grainau weather in August.

September and October display notable differences in weather patterns. September typically experiences a broader temperature range, with minimums around -2°C and maximums peaking at 24°C, averaging 11°C. In contrast, October's temperatures drop further, with minimums falling to -5°C and an average of 7°C, while the maximums decrease to 20°C. Precipitation is also less frequent in October, totaling 123 mm over 13 days, compared to September's 158 mm over 16 days. Furthermore, October tends to be slightly more humid, with humidity levels reaching 90% compared to September's 83%. For a closer look at specific weather details, you can visit Grainau weather in October.

In comparing the weather between September and November, September stands out with a wider temperature range, featuring minimums of -2°C (28°F) and maximums reaching 24°C (75°F), resulting in an average of 11°C (53°F). The month sees considerable precipitation, totaling 158 mm (6.2 in) over 16 days, but maintains a lower humidity of 83%. In contrast, November experiences colder temperatures, with minimums dropping to -12°C (11°F) and a notable decrease in average temperature to 2°C (37°F), even though maximums can still reach 18°C (64°F). November's precipitation is less frequent and totals 85 mm (3.3 in) over 11 days; however, humidity rises to 89%. For more insights on the specifics of November weather, you can visit Grainau weather in November.

September and December display stark contrasts in weather conditions. In September, temperatures range from a minimum of -2°C (28°F) to a maximum of 24°C (75°F), with an average of 11°C (53°F), allowing for a more temperate environment. This month also experiences considerable rainfall, accumulating 158 mm (6.2 in) over about 16 days, coupled with a humidity level of 83%. In contrast, December is much colder, with temperatures dropping to a minimum of -19°C (-1°F) and peaking at only 10°C (51°F), resulting in an average of -2°C (29°F). Despite less precipitation at 123 mm (4.9 in) over 18 days, the humidity reaches a higher level of 90%. For a more detailed look at December weather conditions, you can check Grainau weather in December.

Compare Grainau's Climate with Cities Worldwide

Conclusion: What to Expect From September Weather in Grainau

As September unfolds in Grainau, the transition from summer to autumn is clearly marked by a noticeable drop in temperature and increased precipitation. With an average temperature hovering around a crisp 11°C (53°F), the days can still be pleasantly warm, offering a maximum of 24°C (75°F), but nights can dip to chilly levels. This month experiences more rain, with precipitation occurring on nearly half the days, contributing to the 83% humidity that envelops the area. Such weather contrasts sharply with the warmth of summer, inviting locals and visitors alike to enjoy the breathtaking landscapes painted in rich autumn hues. To further explore what to expect throughout the seasons, check out Grainau Climate.