September Weather in Flachau, Austria

Last updated: February 26, 2025

In September, Flachau, Austria, experiences a transitional month characterized by mild temperatures and varied weather patterns. With maximum highs reaching 24°C (76°F) and a chilly average of 9°C (49°F), the landscape begins its shift from summer warmth to autumn coolness, sometimes plunging to a brisk minimum of -9°C (16°F). Visitors can expect around 140 mm (5.5 in) of precipitation spread across approximately 15 days, contributing to the region's lush greenery and vibrant fall foliage. The humidity levels remain relatively high at 74%, adding a slight chill to the air, making this month an enchanting time to explore the mountainous terrain and its breathtaking scenery.

September Temperature in Flachau

September in Flachau, Austria, marks a transitional phase, where the summer warmth begins to wane and the chill of autumn creeps in. With temperatures ranging from a minimum of -9°C (16°F) to a maximum of 24°C (76°F), the month showcases a remarkable warming from the previous few months, peaking around pleasant highs that invite outdoor activities. The average temperature settles at a comfortable 9°C (49°F), indicating that while the mornings may carry a fresh bite, afternoons still bask in the lingering warmth of late summer. This blend of cool and mild weather creates an ideal backdrop for enjoying the stunning alpine scenery as nature prepares for the cooler months ahead.

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

The chart illustrates September temperature patterns in Flachau, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends.
JanFebMarAprMayJunJulAugSepOctNovDec202530374455565648413223
Data source: Temperature data for Flachau 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 Flachau

In September, Flachau experiences a significant shift in precipitation patterns, recording 140 mm (5.5 in) of rain over 15 days. This marks a transition from the peak summer rainfall seen in August, which brought a hefty 199 mm (7.9 in) across 20 days. Compared to the preceding months, September's precipitation is notably reduced, yet it remains one of the wetter months of the year, reflecting the region's characteristic autumnal showers. As the landscape prepares for the colder months ahead, the relatively mild September rains play a crucial role in nourishing the earth, setting the stage for the vibrant colors of fall in the Austrian Alps.

September Precipitation Trends in Flachau

The chart displays monthly precipitation patterns in Flachau, 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.
JanFebMarAprMayJunJulAugSepOctNovDec95879787171134158199140119112142
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Flachau

In Flachau, Austria, September marks a transition in humidity levels, maintaining a moderate humidity of 74%. This figure represents a slight increase from the summer months, where August recorded the lowest humidity of the year at 68%. As the seasons change, the air begins to feel more saturated, signaling the approach of autumn. The shift is also evident when compared to the peak winter months, where humidity levels soar to around 91% in January and hover around 90% in November and December. Overall, September’s humidity is part of a downward trend from the earlier months, yet still hints at the increasing moisture that characterizes the later part of the year.

September Average Humidity in Flachau

This chart illustrates the average monthly humidity levels in Flachau, 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%87%82%79%74%75%74%69%74%88%90%89%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Flachau

As September unfolds in Flachau, Austria, the UV Index reflects a transition towards autumn, settling at a moderate 7, which classifies the exposure as high. While the burn time increases to 25 minutes, the lingering warmth of summer still invites outdoor explorers to bask in the sun. This month marks a decline from the peak summer levels of 10 in July and June, where precautions were paramount to avoid sunburn in just 15 minutes. Interestingly, the UV Index in September is notably lower than August’s 9, indicating a shift in solar intensity. The gentle easing of UV radiation not only offers a more forgiving outdoor experience but also signals the onset of fall adventures. To stay informed about the UV levels throughout the year, check out the detailed guide at Flachau UV Index.

Maximum UV Index Levels in Flachau for September

The chart shows the monthly maximum UV Index (UVI) for Flachau 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.
JanFebMarAprMayJunJulAugSepOctNovDec24689101097532
Data source: Flachau 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 Flachau

In September, Flachau, Austria, basks in 302 hours of sunshine, signaling a gentle transition from the peak summer warmth of July with its impressive 406 hours to the cooler autumn months. As the lay of the land shifts, September's sun still shines brightly, encapsulating the charming hues of early fall while outshining the diminishing daylight of October, which boasts 283 hours. This decrease from the summer highs indicates a seasonal rhythm, yet September’s ample sunlight allows visitors to soak in the stunning alpine scenery and embrace the lingering warmth, making it an ideal time for outdoor adventures before winter's embrace arrives. With sunshine hours steadily declining towards the winter months, September stands out as a perfect balance of lingering summer light and the crispness of fall.

Monthly Sunshine Duration in Flachau: September Highlighted

The September sunshine duration represents the total number of hours Flachau 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.
JanFebMarAprMayJunJulAugSepOctNovDec184h240h304h343h349h383h406h367h302h283h220h211h
Data source: Flachau September Sunshine duration data generated using information from the Copernicus Climate Change Service.

Chance of Sun in Flachau During September

In Flachau, Austria, the likelihood of sunny weather peaks in September, where the chance of sunshine rises to a cheerful 44%. This delightful shift in weather follows the summer months, which show more variability with July and August experiencing lower probabilities of sunny days at 33% and 27%, respectively. Interestingly, September aligns with the sunnier vibes of February and June, both also with a 44% chance, hinting at a pleasant transition into autumn. As the year progresses, the chances decline towards winter, with January's gloomy 19% feeling like a distant memory. Therefore, September presents a golden opportunity for outdoor enthusiasts to enjoy the stunning alpine landscape bathed in sunlight before the colder months set in.

Percentage of Sunny Days in September in Flachau

The chart illustrates the percentage of sunny days in Flachau 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 Flachau experiences clear skies throughout the year.
JanFebMarAprMayJunJulAugSepOctNovDec19%44%41%35%25%42%33%27%44%33%30%27%
Data source: Flachau September chance of sun data, generated using information from the Copernicus Climate Change Service.

Daylight Hours in Flachau in September

As summer gently transitions into autumn, September in Flachau, Austria, offers a noticeable shift in daylight duration, with approximately 12 hours of light each day. This marks a gradual decline from the sun-drenched days of July and June, which bask in 15 hours of daylight, and serves as a reminder of the approaching cooler months. While May shines at its peak with 15 hours of daylight, September's softer glow hints at the changing seasons, beautifully balancing the lingering warmth of summer with the onset of fall. As the days shorten, the vibrant colors of autumn begin to emerge, creating a stunning backdrop for outdoor adventures.

Average Daylight Hours in Flachau for September

The chart illustrates the variation in daylight duration in Flachau throughout the year, with September highlighted. It shows the monthly changes in daylight hours, calculated by summing the hours between sunrise and sunset.
JanFebMarAprMayJunJulAugSepOctNovDec8h 57m10h 16m11h 56m13h 38m15h 5m15h 50m15h 26m14h 8m12h 30m10h 49m9h 19m8h 32m
Data source: Flachau daylight hours, calculated by summing the hours between sunrise and sunset for each day.

September Winds in Flachau

As autumn begins to whisper through the valleys of Flachau, Austria, September brings a gentle breeze with an average wind speed of just 1.4 m/s (3 mph). This marks a subtle decline from the summer months, reflecting a shift in the seasonal rhythm. Interestingly, the wind has been relatively calm throughout the summer, hovering around similar speeds, making September's slight dip just a continuation of the trend. As the year progresses, October typically sees a slight uptick to 1.7 m/s (4 mph), suggesting an awakening of the winds as winter approaches. Overall, September's breeziness is a reminder of nature's graceful transition, echoing the quiet tranquility of early fall in the Alpine landscape.

Average September Wind Speed in Flachau

The chart displays monthly wind speed patterns in Flachau, 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.
JanFebMarAprMayJunJulAugSepOctNovDec1.61.61.71.91.81.51.61.41.4 m/s1.71.51.7
Data source: Flachau September wind data, generated using information from the Copernicus Climate Change Service.

How September Weather in Flachau Compares to Other Months

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

September and January present stark contrasts in weather conditions. In September, temperatures range from a chilly minimum of -9°C (16°F) to a warm maximum of 24°C (76°F), with an average of 9°C (49°F). The month sees about 140 mm (5.5 in) of precipitation over 15 days, coupled with a humidity level of 74%. In contrast, January experiences much colder temperatures, with a minimum of -23°C (-9°F) and a maximum of just 6°C (42°F), leading to an average temperature of -7°C (21°F). While precipitation decreases to 95 mm (3.7 in) over 13 days, the humidity rises to 91%, creating a distinctly frigid atmosphere. For more details on the weather in January, visit Flachau weather in January.

In September, temperatures vary considerably, with a minimum of -9°C (16°F) and a maximum of 24°C (76°F), resulting in an average of 9°C (49°F). The month sees significant precipitation, amounting to 140 mm (5.5 in) over about 15 days, alongside a humidity level of 74%. In contrast, February is much colder, with temperatures ranging from a minimum of -26°C (-15°F) to a maximum of 10°C (50°F), yielding an average temperature of -4°C (25°F). While February experiences less precipitation at 87 mm (3.4 in) over 12 days, it has a higher humidity of 87%. For a detailed look at February weather, you can visit Flachau weather in February.

In comparing the weather of September and March, notable differences emerge in temperature and precipitation patterns. September boasts a milder climate, with average temperatures ranging from a chilly minimum of -9°C (16°F) to a pleasant maximum of 24°C (76°F), while March experiences much colder conditions, with temperatures dipping as low as -23°C (-10°F) and peaking at 14°C (57°F). Additionally, September has a higher average temperature of 9°C (49°F) compared to March’s average of -1°C (30°F). Precipitation is fairly consistent in both months, with September receiving 140 mm (5.5 in) over 15 days and March recording 97 mm (3.8 in) across 16 days. Humidity levels are slightly higher in March at 82%, compared to September’s 74%. For a closer look at the specific weather conditions in March, visit Flachau weather in March.

When comparing the weather in September and April, several notable differences emerge. September tends to be milder, with temperatures ranging from a minimum of -9°C (16°F) to a maximum of 24°C (76°F), resulting in a comfortable average of 9°C (49°F). In contrast, April experiences cooler temperatures, with a minimum of -16°C (4°F) and a maximum of 19°C (66°F), leading to a lower average of 3°C (37°F). Additionally, while September sees more precipitation at 140 mm (5.5 in) over 15 days, April has less with 87 mm (3.4 in) over 14 days. Humidity is slightly higher in April at 79%, compared to 74% in September, reflecting the transition from winter to spring. For more details on April weather, visit Flachau weather in April.

In comparing the weather between September and May, we observe that both months experience similar maximum temperatures, reaching up to 24°C (76°F). However, September tends to be slightly warmer overall, with an average temperature of 9°C (49°F) compared to May's average of 7°C (44°F). In terms of precipitation, May is wetter, with 171 mm (6.7 in) over 23 days, compared to September's 140 mm (5.5 in) across 15 days. Notably, both months share a consistent humidity level of 74%. For more details on May weather, you can refer to Flachau weather in May.

When comparing the weather in September to that in June, notable differences emerge in both temperature and precipitation patterns. September experiences a wider temperature range, with minimums dropping to -9°C (16°F) and maximums reaching 24°C (76°F), averaging around 9°C (49°F). In contrast, June tends to be milder, with temperatures ranging from -2°C (29°F) to a warmer maximum of 29°C (84°F) and an average of 13°C (55°F). Both months see considerable rainfall, but September has a slightly higher total precipitation of 140 mm (5.5 in) over 15 days, while June sees 134 mm (5.3 in) across 19 days. Humidity levels are relatively similar, with September at 74% and June at 75%. For a closer look at June weather specifics, you can visit Flachau weather in June.

When comparing the weather of July and September, one can observe some notable differences. July tends to be warmer, with average temperatures ranging from a minimum of 3°C (37°F) to a maximum of 29°C (85°F), while September sees a broader range with a minimum of -9°C (16°F) and a maximum of 24°C (76°F). Precipitation is slightly higher in July, with 158 mm (6.2 in) over 21 days, compared to September's 140 mm (5.5 in) over 15 days. Humidity levels remain constant at 74% for both months, indicating a similar moisture content in the air. For a detailed look at July's weather, you can visit Flachau weather in July.

In comparing the weather between August and September, September tends to be cooler, with average temperatures ranging from a minimum of -9°C (16°F) to a maximum of 24°C (76°F), whereas August experiences slightly higher temperatures, with a minimum of -5°C (23°F) and a maximum of 27°C (81°F). Precipitation is also more prevalent in August, with 199 mm (7.9 in) over 20 days, compared to September's 140 mm (5.5 in) across 15 days. Additionally, September boasts a higher humidity level at 74%, compared to the 68% humidity typically experienced in August. For more detailed information about weather patterns, you can refer to Flachau weather in August.

September and October exhibit noticeably different weather patterns. In September, temperatures range from a minimum of -9°C (16°F) to a maximum of 24°C (76°F), with an average of 9°C (49°F). The month receives about 140 mm (5.5 in) of precipitation over 15 days, accompanied by a relatively moderate humidity of 74%. In contrast, October sees a drop in average temperatures to 5°C (41°F), with a range from -8°C (18°F) to 19°C (66°F). The precipitation in October is slightly lower at 119 mm (4.7 in) but is spread over fewer days (12), and humidity increases to 88%. It is a transition month that marks the shift from the warmth of early autumn to the brisk chill of approaching winter. For more detailed information about October weather, visit Flachau weather in October.

September generally features milder temperatures, with lows around -9°C (16°F) and highs reaching up to 24°C (76°F), providing an average of 9°C (49°F). In contrast, November sees much colder conditions, with temperatures dipping as low as -17°C (2°F) and averaging around 0°C (32°F). While September experiences more precipitation, totaling 140 mm (5.5 in) over 15 days, November has slightly less at 112 mm (4.4 in) and rain spread across 12 days. Additionally, the humidity levels rise in November to 90%, compared to September's 74%, making the latter month feel relatively more comfortable. For more detailed insights, visit Flachau weather in November.

In September, the weather is considerably milder, with average temperatures around 9°C (49°F) and maximums reaching 24°C (76°F). The month sees frequent precipitation, occurring on about 15 days, with a total of 140 mm (5.5 in) of rainfall, and humidity levels at 74%. In contrast, December brings much colder conditions, with average temperatures dropping to -5°C (23°F) and maximums only reaching 5°C (42°F). The month experiences slightly higher precipitation at 142 mm (5.6 in) over about 18 days, contributing to a more humid environment at 89%. For more detailed insights into December weather, you can visit Flachau weather in December.

Compare Flachau's Climate with Cities Worldwide

Conclusion: What to Expect From September Weather in Flachau

As September arrives in Flachau, the weather shifts noticeably from the summer's warmth to the crisp embrace of early autumn. With temperatures reflecting a significant dip, the highs are comfortably warm, but the cool nights hint at the winter chill to come. The month sees a rise in precipitation, with rain more frequent across approximately half the days, contributing to the vibrant fall foliage that characterizes this beautiful season. The humidity level remains relatively high, adding a refreshing layer to the mountain air. For a deeper understanding of how Flachau's September weather compares to the rest of the year, explore the details at Flachau Climate.