September Weather in Jena, Germany

Last updated: February 26, 2025

September in Jena, Germany, showcases a dynamic climate as the summer warmth wanes into autumn. With maximum temperatures reaching up to 32°C (91°F), the month offers warm days, while average temperatures hover around 15°C (59°F), giving a gentle transition. In contrast, chilly nights can drop to a brisk 2°C (35°F). During this month, expect approximately 48 mm (1.9 in) of rainfall over 7 days, contributing to the region's high humidity of 83%. This vibrant mix of warmth and moisture sets the stage for the stunning foliage of fall, making September an intriguing time to experience Jena's natural beauty.

September Temperature in Jena

As summer fades into autumn, Jena, Germany experiences a noticeable transition in temperatures during September. The month opens with a mild average of 15°C (59°F), supported by minimum temperatures of 2°C (35°F) and daytime highs reaching up to 32°C (91°F). This significant warmth marks a distinct farewell to the peak summer heat, as September stands out with its blend of warm days and crisp evenings. Despite this gradual cooling trend, the weather remains pleasantly inviting, making it an ideal time for outdoor activities and exploring the vibrant autumn foliage. With a temperature pattern that shifts from the lingering summer warmth to the beginnings of fall, September in Jena beautifully encapsulates the transition of seasons.

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

The chart illustrates September temperature patterns in Jena, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends.
JanFebMarAprMayJunJulAugSepOctNovDec353741485666676759524238
Data source: Temperature data for Jena 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 Jena

In September, Jena, Germany experiences a moderate precipitation level of 48 mm (1.9 in) over the course of 7 days, reflecting a slight dip compared to the wetter summer months of July and August. This decline in rainfall signals the transition into autumn, where precipitation generally becomes less frequent yet remains essential for the changing landscapes. While September's rainfall is lower than May's peak of 67 mm (2.6 in), it still contributes to the overall annual totals that characterize the region’s temperate climate. As the leaves begin to turn, the milder rains of this month complement the crisp air, creating a picturesque backdrop for the transition into fall.

September Precipitation Trends in Jena

The chart displays monthly precipitation patterns in Jena, 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.
JanFebMarAprMayJunJulAugSepOctNovDec494256346752647348544058
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Jena

September in Jena, Germany, sees a slight uptick in humidity, averaging 83%. This marks a subtle shift from the more humid summer months, which lingered around 79% from June through August. As the warmth of summer gives way to the briskness of autumn, the overall humidity begins to rise again. This trend is echoed in the upcoming months, where October will increase to 87%, followed by a notable jump in November to 90%. Therefore, September acts as a transitional month, signaling the onset of wetter conditions that characterize the region as it moves deeper into the fall season.

September Average Humidity in Jena

This chart illustrates the average monthly humidity levels in Jena, 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%90%88%83%75%79%79%79%83%87%90%92%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Jena

As summer fades and autumn approaches, September in Jena, Germany sees a moderate UV Index of 5, which indicates a step down from the very high ratings of July and June. With a burn time of 30 minutes, it's still wise to take precautions during sunny days. This month's UV exposure is comparable to the preceding April but much lower than the peaks of summer. The transition to cooler months is evident, yet it serves as a reminder to remain mindful of sun safety as the sun remains a potent force. For a detailed look at UV levels throughout the year, check out Jena UV Index.

Maximum UV Index Levels in Jena for September

The chart shows the monthly maximum UV Index (UVI) for Jena 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.
JanFebMarAprMayJunJulAugSepOctNovDec224578875421
Data source: Jena 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 Jena

In Jena, Germany, September reveals a delightful transition into autumn, boasting 312 hours of sunshine—a remarkable contrast to the winter months. As summer peaks in July with a dazzling 411 hours, the sunlight begins to taper off, yet September still shines bright compared to the year's earlier months. The gradual decline from summer to autumn is evident, with the month showcasing more sun than the upcoming October, which holds only 256 hours. This trend emphasizes the lingering warmth of late summer, making September a cherished time when the days still glimmer with golden rays before the cooler, cloudier days of fall set in. As the sunlight gently fades, it paints a picturesque picture of change, encapsulating the essence of seasonal transition in this charming city.

Monthly Sunshine Duration in Jena: September Highlighted

The September sunshine duration represents the total number of hours Jena 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.
JanFebMarAprMayJunJulAugSepOctNovDec105h194h269h341h383h402h411h375h312h256h176h136h
Data source: Jena September Sunshine duration data generated using information from the Copernicus Climate Change Service.

Chance of Sun in Jena During September

September in Jena, Germany, brings a 36% chance of sunshine, making it one of the more favorable months for clear skies as summer transitions into fall. This likelihood is on par with March, reflecting a gradual increase in sunny days as compared to the earlier months of the year. Notably, as we move from the cool depths of winter to the vibrant autumn, September stands out in its potential for pleasant weather, especially when viewed alongside the more overcast months like November and December. With this trend, September offers a delightful opportunity to enjoy the outdoors before the colder weather sets in.

Percentage of Sunny Days in September in Jena

The chart illustrates the percentage of sunny days in Jena 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 Jena experiences clear skies throughout the year.
JanFebMarAprMayJunJulAugSepOctNovDec12%27%36%31%33%28%30%30%36%32%18%13%
Data source: Jena September chance of sun data, generated using information from the Copernicus Climate Change Service.

Daylight Hours in Jena in September

As summer fades into autumn, September in Jena, Germany marks a gentle transition in daylight duration. With an average of 12 hours of daylight, the month showcases a slight decline from the sun-drenched days of July and August, which boasted up to 16 and 14 hours, respectively. This gradual decrease signals the approach of shorter days, a trend that will continue into the fall months. Reflecting back on the year, one can see a steady increase in daylight from the deep winter months of January and November, where only 8 hours are offered, to the peak summer brightness of June. September thus stands as a pivotal month, balancing the lingering warmth of summer with the early hints of autumn, creating a beautiful interplay of light and shadow in the landscape.

Average Daylight Hours in Jena for September

The chart illustrates the variation in daylight duration in Jena throughout the year, with September highlighted. It shows the monthly changes in daylight hours, calculated by summing the hours between sunrise and sunset.
JanFebMarAprMayJunJulAugSepOctNovDec8h 28m10h 1m11h 55m13h 51m15h 33m16h 26m15h 58m14h 27m12h 34m10h 38m8h 54m7h 59m
Data source: Jena daylight hours, calculated by summing the hours between sunrise and sunset for each day.

September Winds in Jena

As September rolls into Jena, Germany, the gentle whisper of the wind slows down, with average speeds dipping to 2.4 m/s (5 mph). This marks the lowest wind speed of the year, signaling a shift from the breezier days of summer. While the spring months danced with more spirited gusts, peaking at 3.7 m/s in May, the summer months settled into a calmer rhythm, culminating in August's 2.8 m/s. As autumn approaches, the trend indicates a gradual increase in wind speeds, with October expected to return to a more invigorating 3.3 m/s. This transition not only reflects the changing seasons but also enhances the serene atmosphere of Jena, inviting both locals and visitors to enjoy the crisp air and vibrant fall colors.

Average September Wind Speed in Jena

The chart displays monthly wind speed patterns in Jena, 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.
JanFebMarAprMayJunJulAugSepOctNovDec3.42.93.23.13.72.22.52.82.4 m/s3.33.13.2
Data source: Jena September wind data, generated using information from the Copernicus Climate Change Service.

How September Weather in Jena Compares to Other Months

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

September and January present stark contrasts in weather conditions. In September, temperatures range from a cool 2°C (35°F) at night to a warm 32°C (91°F) during the day, with an average of 15°C (59°F). The month sees about 48 mm (1.9 in) of precipitation over approximately 7 days, along with an average humidity of 83%. In contrast, January is much colder, with temperatures dropping to a frigid -11°C (12°F) at night and peaking at 14°C (57°F) during the day, leading to an average of just 2°C (36°F). The precipitation is slightly higher at 49 mm (1.9 in) but occurs over 12 days, and humidity rises to 91%. For more detailed insights about the weather during this time, check out Jena weather in January.

In September, the weather in Jena features a mild climate with temperatures ranging from a chilly 2°C (35°F) at night to a warm 32°C (91°F) during the day, while the average temperature settles around 15°C (59°F). With about 48 mm (1.9 in) of rainfall over approximately 7 days, humidity remains high at 83%. In stark contrast, February brings much colder conditions, where temperatures can dip as low as -19°C (-2°F), with an average of just 3°C (37°F) and a maximum of 18°C (65°F). Despite slightly lower precipitation at 42 mm (1.7 in) over about 9 days, humidity peaks at 90%. For a detailed look at February weather, visit Jena weather in February.

September weather features a warm climate, with temperatures ranging from a cool minimum of 2°C (35°F) to a maximum of 32°C (91°F), averaging around 15°C (59°F). With an average rainfall of 48 mm (1.9 in) spread over 7 days, humidity levels sit at a moderate 83%. In contrast, March conditions are much chillier, seeing lows of -13°C (10°F) and highs reaching 21°C (71°F), with an average temperature of 5°C (41°F). March is slightly wetter, with 56 mm (2.2 in) of precipitation occurring over 15 days, and a higher humidity of 88%. For a more detailed comparison, check out Jena weather in March.

September and April exhibit notable differences in weather patterns. In September, temperatures range from a chilly 2°C (35°F) to a warm high of 32°C (91°F), with an average temperature of 15°C (59°F), making it a month that can experience considerable heat. In contrast, April sees cooler temperatures, with a minimum of -6°C (21°F) and an average of 9°C (48°F), peaking at 27°C (81°F). Both months feature similar humidity levels at 83%, but September receives slightly more precipitation, totaling 48 mm (1.9 in) over 7 days, compared to April's 34 mm (1.4 in) across 8 days. For more detailed information on April weather, you can visit Jena weather in April.

When comparing the weather in September and May, several notable differences emerge. September generally experiences a broader temperature range, with minimums around 2°C (35°F) and maximums reaching up to 32°C (91°F), while May starts with slightly cooler minimums at -1°C (30°F) and has a maximum of 30°C (86°F). Additionally, September tends to be drier, with only 48 mm (1.9 in) of precipitation over roughly 7 days compared to May's higher precipitation of 67 mm (2.6 in) over 12 days. The humidity levels are also noteworthy, with September averaging 83% and May at a lower 75%. For more detailed insights, you can visit Jena weather in May.

September and June offer distinct weather experiences. In September, temperatures range from a chilly 2°C (35°F) to a warm 32°C (91°F), with an average of 15°C (59°F). The month sees an average of 7 rainy days, totaling around 48 mm (1.9 in) of precipitation, and humidity levels hover at a high 83%. In contrast, June typically has milder temperatures, with a minimum of 5°C (41°F), an average of 19°C (66°F), and a maximum reaching up to 36°C (97°F). Precipitation is slightly higher at 52 mm (2.0 in), spread over about 10 days, and humidity is lower at 79%. For more details on June weather specifically in Jena, check out Jena weather in June.

When comparing the weather in September and July, notable differences emerge. September experiences a wider temperature range, with minimums dropping to 2°C (35°F) and maximums reaching up to 32°C (91°F), while the average temperature settles around 15°C (59°F). Conversely, July is warmer overall, with minimum temperatures at 7°C (46°F) and maximums soaring to 37°C (98°F), averaging 19°C (67°F). Precipitation in September totals 48 mm (1.9 in) over about 7 days, making it slightly drier than July, which sees 64 mm (2.5 in) across 10 days. Humidity levels are comparable, with September at 83% and July at 79%. For a more detailed look at July's climate, check out Jena weather in July.

September weather is characterized by a wider temperature range, with minimums dropping to 2°C (35°F) and maximums reaching 32°C (91°F), compared to August, which has milder minimums at 7°C (45°F) and higher maximums peaking at 36°C (98°F). The average temperature in September is cooler at 15°C (59°F) versus 20°C (68°F) in August. Rainfall is slightly less in September, totaling 48 mm (1.9 in) over 7 days, while August experiences more precipitation at 73 mm (2.9 in) over 10 days. Overall, September feels more transitional with higher humidity at 83%, albeit slightly more comfortable than August's 79%. For more details on August weather, check out Jena weather in August.

September typically experiences warmer temperatures, with a minimum of 2°C (35°F) and an average high of 32°C (91°F), while October sees cooler conditions, dropping to a minimum of -1°C (31°F) and an average high of 26°C (79°F). Additionally, precipitation increases slightly in October to 54 mm (2.1 in), compared to September's 48 mm (1.9 in), and the number of rainy days rises from 7 to 11. Humidity also tends to be higher in October at 87%, compared to 83% in September, creating a more damp atmosphere as the month progresses. For more detailed insights, you can check Jena weather in October.

In September, the weather is characterized by a warmer temperature range, with minimums around 2°C (35°F) and maximums reaching up to 32°C (91°F), resulting in an average of 15°C (59°F). The month sees moderate rainfall, totaling 48 mm (1.9 in) over about 7 days, and humidity levels are quite high at 83%. In contrast, November brings cooler temperatures, with a min of -5°C (24°F) and a max of 20°C (68°F), averaging just 6°C (42°F). While precipitation is slightly lower at 40 mm (1.6 in), it occurs more frequently over 10 days, and humidity rises to 90%. For more detailed insights, check out Jena weather in November.

September and December exhibit notably contrasting weather patterns. In September, temperatures range from a minimum of 2°C (35°F) to a maximum of 32°C (91°F), with an average of 15°C (59°F). The month experiences moderate precipitation of 48 mm (1.9 in) over about 7 days, accompanied by a humidity level of 83%. In stark contrast, December's temperatures are significantly cooler, with a minimum of -12°C (11°F), an average of 3°C (38°F), and a maximum of 14°C (57°F). This month also sees increased precipitation of 58 mm (2.3 in) spread over 14 days and higher humidity at 92%. For more details, you can check Jena weather in December.

Compare Jena's Climate with Cities Worldwide

Conclusion: What to Expect From September Weather in Jena

As September unfolds in Jena, the weather transitions from the hot summer peak, offering a delightful mix of warm days and cooler nights. With an average temperature settling at a mild 15°C, this month is a refreshing break from the intense heat of August. Although rainfall is quite manageable, with only a handful of rainy days, the high humidity adds a touch of mugginess to the air. This blend of warmth and moisture creates an inviting atmosphere perfect for enjoying the vibrant fall scenery. For a deeper dive into how Jena’s climate shapes this unique month, explore Jena Climate.