September Weather in Mellau, Austria

Last updated: February 26, 2025

Mellau, Austria, in September offers a temperate climate that invites outdoor exploration, with maximum temperatures reaching 22°C (72°F) against a refreshing average of 10°C (50°F). Visitors can expect the occasional chill, as minimum temperatures can drop to -5°C (23°F). The month is characterized by moderate rainfall, accumulating around 156 mm (6.1 in) over approximately 16 days, contributing to the region's lush landscapes. With an overall humidity level of 83%, September in Mellau balances crisp mountain air with gentle warmth, making it an appealing destination for both adventure seekers and those looking for a peaceful retreat.

September Temperature in Mellau

In Mellau, Austria, September marks a transition from the warmth of summer to the crispness of autumn. As temperatures begin to cool, the average rises to a temperate 10°C (50°F), with highs reaching a comfortable 22°C (72°F), making it ideal for outdoor adventures amidst vibrant fall foliage. The nights, however, can be chilly, dipping down to -5°C (23°F), hinting at the impending winter ahead. This month stands out as a bridge between the balmy days of summer and the colder months that follow, showcasing a delightful blend of lingering warmth and the fresh, invigorating air of early autumn. As nature starts to change, September in Mellau offers a perfect opportunity to embrace the stunning Alpine landscape before the snow blankets the region.

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

The chart illustrates September temperature patterns in Mellau, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends.
JanFebMarAprMayJunJulAugSepOctNovDec232832394555575750433325
Data source: Temperature data for Mellau 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 Mellau

In September, Mellau experiences a notable transition as the summer warmth begins to wane, reflected in the precipitation amount of 156 mm (6.1 in) over 16 days of rain. This marks a slight decrease from the preceding months, particularly August's 207 mm; however, it remains among the higher totals of the year. As students return to school and autumn unfolds, the moisture is crucial for the region's lush landscapes and helps prepare the ground for winter. The consistent rainfall pattern observed in the late summer suggests a smooth shift into October, when precipitation levels typically moderate further, with 140 mm (5.5 in) expected over 13 days.

September Precipitation Trends in Mellau

The chart displays monthly precipitation patterns in Mellau, 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.
JanFebMarAprMayJunJulAugSepOctNovDec1451051379621119419420715614090176
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
Choose your preferred precipitation unit

September Humidity in Mellau

September in Mellau, Austria, reflects a transitional moment in its humidity patterns, with levels sitting at 83%. This month marks a slight rise from the summer average of 80% in both July and August, suggesting a return to the more humid conditions typically seen in the beginning of the year. Following this September peak, humidity is set to climb once again, reaching 90% in October, which hints at the onset of autumn’s chill and the approaching winter. Overall, Mellau’s humidity tends to be notably high throughout the year, with the peak months being January and December, maintaining a consistent moisture level that enriches the region's lush landscapes.

September Average Humidity in Mellau

This chart illustrates the average monthly humidity levels in Mellau, 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.
JanFebMarAprMayJunJulAugSepOctNovDec92%89%87%84%80%82%83%80%83%90%89%90%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Mellau

In September, Mellau, Austria experiences a noticeable shift in UV exposure compared to the peak summer months. With a UV Index of 7, categorized as high, residents and visitors can anticipate a burn time of 25 minutes — a slight moderation from the intense UV levels of July and June, which both reached a maximum of 10. As the days grow shorter and the sun's angle lowers, this reduction highlights a trend of decreasing UV strength as summer fades into autumn. However, caution is still advised, especially during midday hours. For those looking to plan outdoor activities, it remains essential to be aware of the UV levels throughout the month. For a detailed overview, check out Mellau UV Index.

Maximum UV Index Levels in Mellau for September

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

In September, Mellau, Austria basks in a delightful 316 hours of sunshine, transitioning gracefully from the vibrant summer months into the crispness of autumn. This total reflects a notable decrease from July's peak of 409 hours, yet it remains significantly high compared to the lower winter months that follow. The weeks of September benefit from the lingering warmth of summer, making them perfect for outdoor activities against a backdrop of stunning fall foliage. With both daylight and delightful weather, September offers a unique blend, allowing visitors to embrace the last golden days of the year before the shorter days set in.

Monthly Sunshine Duration in Mellau: September Highlighted

The September sunshine duration represents the total number of hours Mellau 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.
JanFebMarAprMayJunJulAugSepOctNovDec173h239h310h357h372h392h409h376h316h286h230h195h
Data source: Mellau September Sunshine duration data generated using information from the Copernicus Climate Change Service.

Chance of Sun in Mellau During September

In Mellau, Austria, the likelihood of enjoying sunny weather in September is a promising 43%, aligning with the sunniness observed in both April and October. As the summer months wind down, September offers a delightful transition with a significant chance of sunshine, comparable to the peaks seen earlier in the year. Interestingly, this suggests a trend where early autumn can rival late spring for sunny days, providing an ideal backdrop for outdoor activities and exploration. As you plan your visit, you can look forward to clear skies and pleasant weather during this beautiful time in the Alps.

Percentage of Sunny Days in September in Mellau

The chart illustrates the percentage of sunny days in Mellau 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 Mellau experiences clear skies throughout the year.
JanFebMarAprMayJunJulAugSepOctNovDec21%43%39%43%31%33%31%32%43%42%36%36%
Data source: Mellau September chance of sun data, generated using information from the Copernicus Climate Change Service.

Daylight Hours in Mellau in September

As summer fades into autumn, September in Mellau, Austria, brings a gradual decline in daylight, featuring about 12 hours of sunlight. This marks a shift from the height of summer when daylight peaks at 15 hours in June, July, and early August. With daylight hours steadily decreasing as the year progresses, September’s light still holds onto the lingering warmth of summer while hinting at the crispness of fall. The transition becomes more pronounced as October approaches, with daylight dipping to 10 hours, indicating the inevitable arrival of shorter days and the enchanting changes of the autumn landscape.

Average Daylight Hours in Mellau for September

The chart illustrates the variation in daylight duration in Mellau throughout the year, with September highlighted. It shows the monthly changes in daylight hours, calculated by summing the hours between sunrise and sunset.
JanFebMarAprMayJunJulAugSepOctNovDec8h 56m10h 16m11h 56m13h 38m15h 6m15h 51m15h 27m14h 9m12h 30m10h 48m9h 18m8h 31m
Data source: Mellau daylight hours, calculated by summing the hours between sunrise and sunset for each day.

September Winds in Mellau

In Mellau, Austria, the winds tell a gentle story as summer transitions to fall. September brings a slight reduction in average wind speed to 1.3 m/s (3 mph), mirroring the calming breezes of July and August. This month marks a departure from the higher speeds seen earlier in the year, with April’s 1.6 m/s (3 mph) being the peak for spring. Throughout the year, the wind tends to fluctuate modestly, maintaining a serene atmosphere that invites contemplation and appreciation for the stunning alpine landscapes. As October approaches, a subtle increase to 1.6 m/s (4 mph) hints at the cooler months ahead, creating a perfect balance between the lingering warmth of summer and the crispness of autumn.

Average September Wind Speed in Mellau

The chart displays monthly wind speed patterns in Mellau, 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.
JanFebMarAprMayJunJulAugSepOctNovDec1.71.81.51.61.71.31.31.41.3 m/s1.61.41.7
Data source: Mellau September wind data, generated using information from the Copernicus Climate Change Service.

How September Weather in Mellau Compares to Other Months

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

September and January present starkly contrasting weather conditions. In September, temperatures range from a chilly -5°C (23°F) at night to a pleasant 22°C (72°F) during the day, with an average of 10°C (50°F). The month experiences considerable rainfall, with 156 mm (6.1 in) spread over 16 days, and humidity levels at 83%. In comparison, January is much colder, with temperatures ranging from a frigid -29°C (-20°F) to a maximum of 8°C (46°F), averaging -5°C (23°F). Precipitation is slightly lower at 145 mm (5.7 in) over 12 days, and humidity rises to 92%. These figures highlight the drastic seasonal changes, making September feel warmer and more humid than the bitter cold of January. For more details about the weather in January, check out Mellau weather in January.

September and February present distinctly different weather patterns. In September, temperatures range from a chilly -5°C (23°F) at night to a comfortable 22°C (72°F) during the day, with an average of 10°C (50°F). The month experiences significant precipitation, totaling 156 mm (6.1 in) across about 16 days, and maintains a humidity level of 83%. In contrast, February is much colder, with minimum temperatures plunging to -20°C (-4°F) and a daytime maximum of only 12°C (54°F), averaging -2°C (28°F). Although February has less precipitation at 105 mm (4.1 in) spread over 12 days, the humidity is slightly higher at 89%. For more detailed information on February weather in Mellau, you can check out Mellau weather in February.

September and March present contrasting weather patterns, reflecting the transition from late summer to early spring. In September, temperatures range from a minimum of -5°C (23°F) to a maximum of 22°C (72°F), with an average temperature of 10°C (50°F), while March is colder, with a minimum of -21°C (-5°F) and a maximum of 14°C (58°F), averaging around 0°C (32°F). Precipitation levels are relatively similar, with September experiencing 156 mm over 16 days and March at 136 mm across 17 days, although humidity is slightly higher in March at 87% compared to September's 83%. For more detailed information on March weather, you can refer to Mellau weather in March.

In comparing the weather between September and April, we find distinct differences in temperature and precipitation patterns. September boasts a milder average temperature of 10°C (50°F), with highs reaching up to 22°C (72°F), while April begins with much cooler temperatures, averaging around 4°C (39°F) and dipping as low as -18°C (-1°F). Although September experiences more rainfall, with a total of 156 mm (6.1 in) over 16 days, April also sees significant precipitation at 96 mm (3.8 in) across 13 days, contributing to the slightly higher humidity at 84%. For a more detailed look at the weather in this month, you can explore Mellau weather in April.

In comparing the weather between September and May, notable differences emerge. September typically enjoys milder temperatures with a minimum of -5°C (23°F) and an average of 10°C (50°F), peaking at 22°C (72°F). Conversely, May begins with cooler minimum temperatures at -9°C (16°F) but can soar to a maximum of 25°C (77°F), showcasing a wider temperature range. Precipitation is also more pronounced in May, averaging 211 mm (8.3 in) over 23 days, while September sees less rain at 156 mm (6.1 in) across 16 days. Humidity is slightly higher in September at 83% compared to May's 80%, which can influence the overall comfort level during these months. For more detailed information, you can explore Mellau weather in May.

September typically experiences a milder range of temperatures compared to June, with minimums around -5°C (23°F) and maximums reaching 22°C (72°F), while June enjoys slightly warmer averages, featuring a minimum of -1°C (31°F) and a high of 29°C (84°F). Both months see significant precipitation, but June has a higher average at 194 mm (7.7 in) across 21 days, compared to September’s 156 mm (6.1 in) spread over 16 days. Interestingly, humidity levels remain relatively similar, hovering at 83% in September and slightly lower at 82% in June. For more details on June weather, you can visit Mellau weather in June.

In comparison to September, July experiences warmer temperatures, with minimums around 3°C (39°F) and maximums reaching up to 28°C (83°F), compared to September's minimum of -5°C (23°F) and maximum of 22°C (72°F). While both months share similar humidity levels at 83%, July sees slightly higher precipitation, totaling 194 mm (7.6 in) over 20 days, whereas September receives 156 mm (6.1 in) across 16 days. For more detailed climate information, check out Mellau weather in July.

In comparing the weather between August and September, we notice a significant drop in average temperatures. While August boasts a milder average of 14°C (57°F) with maximums reaching up to 28°C (82°F), September experiences cooler conditions with an average temperature of 10°C (50°F) and maximums peaking at 22°C (72°F). Furthermore, September also brings more frequent rain, with precipitation occurring on 16 days and totaling 156 mm (6.1 in), compared to August's 20 days of rain and higher cumulative precipitation of 207 mm (8.1 in). Humidity remains quite high in both months, with September at 83% and August slightly lower at 80%. For a more detailed look at August's weather, you can visit Mellau weather in August.

September and October present a notable shift in weather patterns. In September, temperatures range from a minimum of -5°C (23°F) to a maximum of 22°C (72°F), with an average of 10°C (50°F) and significant precipitation of 156 mm (6.1 in) over 16 days. Humidity is relatively high at 83%. In contrast, October brings slightly cooler temperatures, with a minimum of -7°C (19°F) and a maximum of 19°C (66°F), leading to an average of 6°C (43°F). Precipitation decreases to 140 mm (5.5 in) over 13 days, and humidity rises to 90%. For more details, you can check out Mellau weather in October.

September and November present notable differences in weather conditions. In September, temperatures range from a chilly minimum of -5°C (23°F) to a comfortable maximum of 22°C (72°F), with an average of 10°C (50°F). The month sees significant rainfall, totaling 156 mm (6.1 in) over 16 days, and a high humidity level of 83%. In contrast, November experiences lower temperatures, featuring a minimum of -19°C (-2°F) and an average high of only 17°C (62°F), leading to an overall average of just 1°C (33°F). Although November has less precipitation at 90 mm (3.6 in) over 10 days, the humidity slightly increases to 88%, creating a distinctly colder and more humid atmosphere. For further details on specific weather conditions, you can visit Mellau weather in November.

September and December present stark contrasts in weather conditions. In September, temperatures range from a minimum of -5°C (23°F) to a comfortable maximum of 22°C (72°F), with an average of 10°C (50°F). The month sees a fair amount of rainfall, tallying 156 mm (6.1 in) over 16 days, and maintains a humidity level of 83%. In contrast, December brings a much colder climate, with temperatures plunging to a minimum of -23°C (-10°F) and averaging -4°C (25°F). The maximum temperature is limited to 9°C (48°F), and precipitation slightly increases to 176 mm (6.9 in) across 18 days, accompanied by a higher humidity level of 90%. For more detailed information on December weather, you can check out Mellau weather in December.

Compare Mellau's Climate with Cities Worldwide

Conclusion: What to Expect From September Weather in Mellau

As September unfolds in Mellau, the weather transitions into a refreshing fall ambiance, making it stand out from the warmer summer months. Temperatures begin to cool, with pleasant days giving way to crisp evenings, ideal for outdoor activities amidst the stunning autumn foliage. While occasional rainfall occurs, with a notable number of precipitation days, the overall atmosphere remains invigorating, complemented by relatively high humidity levels. This combination creates a unique climate, setting the stage for a picturesque autumn experience. To learn more about how September weather fits into Mellau's overall climate patterns, visit Mellau Climate.