September Weather in Graz, Austria

Last updated: February 26, 2025

September in Graz, Austria, offers a vibrant transition from the warmth of summer to the coolness of autumn. With maximum temperatures reaching 30°C (86°F), the days can still feel quite warm, while the average temperature hovers around 16°C (60°F), providing a comfortable backdrop for outdoor activities. However, locals and visitors alike should be prepared for a touch of rain, as the month sees approximately 102 mm (4.0 in) of precipitation spread over 12 days. The humidity levels at 65% contribute to a fresh and crisp atmosphere, ideal for enjoying the stunning fall foliage and picturesque landscapes of this charming city.

September Temperature in Graz

September in Graz, Austria, marks a vibrant transition into autumn, with temperatures reflecting a comfortable coolness. The month begins with a minimum of 1°C (34°F) and peaks at a pleasant 30°C (86°F), offering a balmy average of 16°C (60°F). This temperate climate invites locals and visitors alike to enjoy the outdoors as summer’s warmth lingers before giving way to cooler October days. While the evenings start to chill, the lingering warmth of the afternoons is perfect for exploring Graz’s beautiful parks and historic sites. Notably, the gradual decrease in temperatures from August signals the onset of fall, creating a picturesque backdrop for the changing leaves and harvest festivities.

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

The chart illustrates September temperature patterns in Graz, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends.
JanFebMarAprMayJunJulAugSepOctNovDec313742505868696960514133
Data source: Temperature data for Graz 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 Graz

In September, Graz experiences a notable transition in its weather, with precipitation reaching 102 mm (4.0 in), closely mirroring the previous month’s totals. This increase marks a continuation of the wet summer, as August also recorded a substantial 101 mm (4.0 in), emphasizing the region's role as a lush hotspot during this time of year. With 12 days of rainfall, September maintains a similar pattern to August, allowing for a gradual winding down of the wetter months into the fall. Following the peak precipitation in May at 112 mm, Graz's rainfall levels hint at a subtle decline as the year progresses, making September a pivotal month for residents transitioning their outdoor activities. Overall, the monthly precipitation amounts illustrate Graz's climate rhythm, bridging late summer warmth with the cooler, drier days that October will bring.

September Precipitation Trends in Graz

The chart displays monthly precipitation patterns in Graz, 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.
JanFebMarAprMayJunJulAugSepOctNovDec253838571127791101102457354
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
Choose your preferred precipitation unit

September Humidity in Graz

As summer draws to a close in September, Graz, Austria experiences a noticeable shift in humidity levels. After months of drier air, with August boasting a low of 60%, September sees a slight increase, with humidity rising to 65%. This transition marks the beginning of a trend where the humidity levels gradually climb, peaking in the colder months of October through December, with values reaching as high as 89%. The overall pattern reveals how Graz's climate cycles through a range of moisture, where the relative comfort of late summer gives way to the crisp, damp chill of autumn and winter, underscoring the city's diverse seasonal climate.

September Average Humidity in Graz

This chart illustrates the average monthly humidity levels in Graz, 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.
JanFebMarAprMayJunJulAugSepOctNovDec90%84%78%73%71%73%70%60%65%84%89%89%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Graz

In September, Graz, Austria, experiences a UV Index of 6, categorized as high. This indicates that while sunburn risks are reduced compared to the peak summer months, caution is still warranted, especially during midday. With a burn time of just 25 minutes, residents and visitors are encouraged to take protective measures when outdoors. This month marks a gradual decline from the summer's extreme UV levels, reflecting a trend of decreasing sun intensity as autumn approaches. As you enjoy the changing scenery, remember it's still essential to be mindful of UV exposure. For detailed insights on UV levels throughout the year, check out the Graz UV Index.

Maximum UV Index Levels in Graz for September

The chart shows the monthly maximum UV Index (UVI) for Graz 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.
JanFebMarAprMayJunJulAugSepOctNovDec235689986431
Data source: Graz 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 Graz

September in Graz, Austria, brings a delightful blend of warmth and brightness, with 313 hours of sunshine illuminating the city. As summer transitions to autumn, the sun’s rays begin to soften, yet this month still showcases a robust amount of daylight, sitting comfortably higher than October's 284 hours. It's a time when the vibrant hues of falling leaves compete with the lingering warmth of the sun, creating a picturesque backdrop for outdoor activities. After reaching its peak in July with 419 hours, sunshine begins to gradually wane, but September still offers plenty of opportunities to bask in the glow before winter settles in. Visitors and residents alike can savor this golden month, enjoying both the pleasant weather and the enchanting scenery that Graz has to offer.

Monthly Sunshine Duration in Graz: September Highlighted

The September sunshine duration represents the total number of hours Graz 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.
JanFebMarAprMayJunJulAugSepOctNovDec171h230h306h345h359h397h419h382h313h284h213h199h
Data source: Graz September Sunshine duration data generated using information from the Copernicus Climate Change Service.

Chance of Sun in Graz During September

As September arrives in Graz, Austria, residents can look forward to a moderate increase in sunny days, marked by a 51% chance of sunshine. This trend continues the upward movement seen from the summer months, where July and August exhibited chances of 45% and 41%, respectively. While early autumn might signal a decline in sunshine compared to peak summer, September's outlook is notably brighter than the preceding months of April and May. With a greater likelihood of sunny weather than in several earlier months, September in Graz presents an appealing opportunity for outdoor activities and enjoying the beautiful fall scenery.

Percentage of Sunny Days in September in Graz

The chart illustrates the percentage of sunny days in Graz 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 Graz experiences clear skies throughout the year.
JanFebMarAprMayJunJulAugSepOctNovDec31%48%54%39%35%50%45%41%51%40%28%34%
Data source: Graz September chance of sun data, generated using information from the Copernicus Climate Change Service.

Daylight Hours in Graz in September

As September arrives in Graz, Austria, the days begin to shorten, offering approximately 12 hours of daylight. This marks a gentle decline from the 15 hours enjoyed in the peak summer months of June and July. With the lush greenery of late summer still vibrant, September serves as a transitional month, where daylight wanes but the warmth of longer days lingers. The gradual decrease in brightness hints at the approaching autumn, reminding us of the seasonal rhythm that shapes Graz throughout the year. As the month unfolds, the golden hues of early fall become more pronounced, inviting both reflection and appreciation for the beauty of change.

Average Daylight Hours in Graz for September

The chart illustrates the variation in daylight duration in Graz throughout the year, with September highlighted. It shows the monthly changes in daylight hours, calculated by summing the hours between sunrise and sunset.
JanFebMarAprMayJunJulAugSepOctNovDec8h 58m10h 17m11h 56m13h 37m15h 4m15h 48m15h 25m14h 7m12h 30m10h 49m9h 20m8h 34m
Data source: Graz daylight hours, calculated by summing the hours between sunrise and sunset for each day.

September Winds in Graz

In September, Graz experiences a gentle breeze with an average wind speed of 1.5 m/s (3 mph), marking one of the calmest months of the year. This subtle decline in wind speed follows a mildly breezy summer, where gusts reached around 2.0 m/s (4 mph) in July and May. As autumn approaches, the winds begin to slow down, reflecting a broader trend of gradually decreasing wind speeds from the lively early months of spring to the more tranquil late summer and early autumn. With November expected to follow with only 1.3 m/s (3 mph), September serves as a serene transition into the quieter winds of the coming season, inviting residents and visitors alike to enjoy the crisp air and picturesque landscapes of Graz.

Average September Wind Speed in Graz

The chart displays monthly wind speed patterns in Graz, 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.
JanFebMarAprMayJunJulAugSepOctNovDec1.71.71.92.12.01.72.01.61.5 m/s1.71.31.5
Data source: Graz September wind data, generated using information from the Copernicus Climate Change Service.

How September Weather in Graz Compares to Other Months

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

September weather is characterized by a wide temperature range, with minimums around 1°C (34°F) and maximums reaching up to 30°C (86°F). This month typically sees an average temperature of 16°C (60°F) and experiences 102 mm (4.0 in) of precipitation over about 12 days, combined with a humidity level of 65%. In contrast, January presents a stark chill, with minimum temperatures plummeting to -19°C (-1°F) and average temperatures hovering at 0°C (32°F). The maximum temperature in January is significantly lower at 15°C (59°F), and the month records only 25 mm (1.0 in) of precipitation across approximately 5 days, alongside a high humidity of 90%. For more detailed information about January weather, visit Graz weather in January.

In September, the weather is considerably warmer, with temperatures ranging from a cool minimum of 1°C (34°F) to a comfortable maximum of 30°C (86°F) and an average of 16°C (60°F). This month also sees a fair amount of rainfall, with 102 mm (4.0 in) spread over 12 days, contributing to a humidity level of 65%. In contrast, February experiences much colder temperatures, with a minimum of -14°C (7°F) and a more moderate maximum of 20°C (68°F), yielding an average temperature of just 3°C (37°F). This month has significantly less precipitation, totaling 38 mm (1.5 in) over 8 days, but the humidity rises to 84%. For more details on February’s climate, you can check Graz weather in February.

September and March present starkly contrasting weather patterns. In September, temperatures range from a chilly minimum of 1°C (34°F) to a warm maximum of 30°C (86°F), with an average of 16°C (60°F). The month is also characterized by moderate precipitation, totaling 102 mm (4.0 in) over about 12 days, accompanied by a humidity level of 65%. In contrast, March experiences noticeably colder temperatures, with a minimum of -20°C (-4°F) and a maximum of 23°C (73°F), averaging just 5°C (42°F). Precipitation in March is relatively low at 38 mm (1.5 in) over 8 days, but humidity is higher at 78%. The comparison highlights how September leans toward warmer, wetter conditions, whereas March typically remains cold and drier. For more details on March weather, visit Graz weather in March.

When comparing the weather in September and April, notable differences emerge in temperature and precipitation. September boasts a wider temperature range, with a minimum of 1°C (34°F) and a warm maximum of 30°C (86°F), leading to an average of 16°C (60°F). In contrast, April starts cooler, with temperatures ranging from a minimum of -5°C (24°F) to a maximum of 27°C (80°F), averaging 10°C (51°F). Precipitation levels also differ; September experiences more rain, totaling 102 mm (4.0 in) over 12 days, while April has 57 mm (2.3 in) spread across 10 days. Additionally, humidity is slightly higher in April at 73%, compared to September’s 65%. For a more detailed look at April's weather specifics, you can check Graz weather in April.

In September, the weather offers a wide range of temperatures, with minimums dipping to 1°C (34°F) and maximums reaching up to 30°C (86°F), resulting in an average temperature of 16°C (60°F). In contrast, May experiences slightly cooler average temperatures at 14°C (58°F) but still has notable highs of 29°C (85°F) and very similar lows of 1°C (34°F). Both months receive significant rainfall, with September recording 102 mm (4.0 in) over 12 days, while May sees 112 mm (4.4 in) across 18 days, contributing to a higher humidity level of 71% in May compared to 65% in September. For more specifics about May weather, you can check Graz weather in May.

When comparing the weather in September and June, September often presents a broader temperature range, with minimums dropping to 1°C (34°F) and maximums reaching up to 30°C (86°F). In contrast, June tends to be warmer overall, with temperatures ranging from a minimum of 5°C (42°F) to a maximum of 35°C (95°F). September experiences more precipitation, totaling 102 mm (4.0 in) over about 12 days, compared to June’s 77 mm (3.0 in) over 14 days. Additionally, September's humidity is slightly lower at 65% compared to June's higher humidity of 73%. For more specific details about June weather, you can check Graz weather in June.

When comparing the weather in September to that of July, we see distinct differences in temperature and humidity. September experiences a broader temperature range, with minimums dropping to 1°C (34°F) and maximums reaching up to 30°C (86°F), while July maintains a warmer climate with minimums of 10°C (49°F) and maximums peaking at 34°C (94°F). Additionally, September tends to be slightly wetter, with 102 mm (4.0 in) of precipitation over 12 days compared to July's 91 mm (3.6 in) over 14 days. Both months have relatively high humidity, with September averaging 65% and July slightly higher at 70%. For more details, you can check out Graz weather in July.

In comparing the weather between September and August, September tends to be cooler with a minimum temperature of 1°C (34°F) and an average of 16°C (60°F), while August enjoys milder temperatures ranging from a minimum of 7°C (45°F) and an average of 21°C (69°F). The maximum temperature in September reaches 30°C (86°F), which is lower than August's peak of 36°C (97°F). Precipitation levels are quite similar, with September recording 102 mm over 12 days and August slightly ahead at 101 mm over 13 days. Additionally, September's humidity is slightly higher at 65% compared to August's 60%. For more detailed insights, you can check this link: Graz weather in August.

In September, temperatures showed a wider range, with minimums reaching 1°C (34°F) and maximums soaring up to 30°C (86°F), averaging around 16°C (60°F). The month also saw about 102 mm (4.0 in) of rainfall over 12 days, accompanied by 65% humidity. In contrast, October brings cooler temperatures, with a minimum of -1°C (30°F) and a maximum of 25°C (77°F), averaging 11°C (51°F). Rainfall significantly decreases to 45 mm (1.8 in) over just 8 days, while humidity rises to 84%. This shift towards cooler and wetter conditions highlights the transition from late summer to early autumn. For more detailed information, check out Graz weather in October.

In September, the weather is generally warmer with temperatures ranging from a minimum of 1°C (34°F) to a maximum of 30°C (86°F) and an average of 16°C (60°F). The month also experiences moderate precipitation, accumulating 102 mm (4.0 in) over approximately 12 days, alongside a humidity level of 65%. In contrast, November ushers in cooler temperatures, with a minimum of -6°C (22°F) and an average of 5°C (42°F), peaking at 20°C (68°F). Precipitation decreases to 73 mm (2.9 in) over 10 days, but humidity rises significantly to 89%. For more detailed insights, you can check out Graz weather in November.

In September, the weather is much warmer, featuring a minimum temperature of 1°C (34°F), an average of 16°C (60°F), and a maximum reaching up to 30°C (86°F). This month also experiences relatively high precipitation levels of 102 mm (4.0 in) across approximately 12 days, with humidity averaging around 65%. In contrast, December brings much cooler conditions, with a minimum temperature dropping to -7°C (19°F) and an average of just 1°C (34°F), peaking at a maximum of 13°C (55°F). Additionally, December sees lower precipitation at 54 mm (2.1 in) spread over 8 days, but the humidity is notably higher at 89%. For more detailed insights about the weather in December, you can refer to Graz weather in December.

Compare Graz's Climate with Cities Worldwide

Conclusion: What to Expect From September Weather in Graz

As summer transitions to autumn, September in Graz presents a captivating mix of warm days and cool nights. With temperatures peaking at a pleasant 30°C, it feels like a gentle farewell to the sun, while the average drops to a more comfortable 16°C. This month also brings an uptick in precipitation, with about 102 mm spread over 12 days, making the air feel fresh but humid at around 65%. Unlike the sweltering peaks of July and August, September's weather is a delightful blend, inviting both locals and visitors to enjoy outdoor activities while relishing the vibrant fall scenery. For a deeper understanding of the seasonal shifts, check out the detailed Graz Climate.