Last updated: August 27, 2025
September in Ljubljana, Slovenia showcases a delightful transition into autumn, with maximum temperatures reaching a warm 29°C (85°F) while the average settles at a comfortable 16°C (61°F). Crisp mornings can surprise with lows dipping to 2°C (35°F). Expect a generous 159 mm (6.3 in) of rainfall spread across 12 days, adding a refreshing touch to the lush greenery. With humidity around 64%, visitors can enjoy the city's stunning architecture and vibrant culture amidst pleasantly mild conditions.
As September arrives in Ljubljana, Slovenia, the city basks in the warmth of late summer, with temperatures gradually shifting from the heights of August. The month showcases a pleasant average temperature of 16°C (61°F), making it an inviting time for outdoor activities. Daily highs can reach up to 29°C (85°F), while the nights cool down to a comfortable 2°C (35°F). This transition signals the start of autumn, as the vibrant summer days begin to fade, yet there's still ample opportunity to enjoy the lingering warmth before cooler months set in. Overall, September in Ljubljana is marked by a refreshing balance of warmth and crispness, setting the stage for the enchanting colors of fall.
In September, Ljubljana experiences a significant uptick in precipitation, with 159 mm (6.3 in) of rainfall over the month, making it one of the wettest periods of the year. This is particularly notable as it marks a peak in precipitation, following the relatively drier summer months. With 12 rainy days, September averages about half the days drenched, setting the stage for the transition into autumn. This trend indicates that as summer wanes, the city prepares for its lush, verdant foliage, fueled by the increased moisture. It's a vivid reminder of nature's cyclical patterns, where the lushness of spring and summer gives way to the richer, darker tones of fall, all while the rain nurtures the landscape in a vibrant display.
As summer transitions into autumn, September in Ljubljana experiences a noticeable shift in humidity levels. Following the warm and relatively dry months of July and August, where humidity dipped to a refreshing 63% and a low of 51% respectively, September sees a modest resurgence with humidity rising to 64%. This gradual increase hints at the approach of cooler months, setting the stage for the higher humidity typical of late autumn, with October peaking once again at 83%. Thus, September serves as a bridge, where lingering warmth is accompanied by a slight dampness, creating a perfect prelude to the atmospheric changes ahead.
As September rolls into Ljubljana, Slovenia, the UV Index reflects a gradual transition from summer's intense rays towards the softer autumnal sunlight. With a UV Index of 7, categorized as high, residents and visitors can expect a burn time of 25 minutes—a decrease from the peak summer months. This shift signifies that while it's still essential to protect your skin, the urgency to seek shade isn't as critical as in July and August, where the index hit a notable 9. September offers an inviting balance, perfect for outdoor activities while reminding us to remain vigilant against UV exposure. For more details on daily UV levels, check out Ljubljana UV Index.
UV Risk Categories
As summer fades into autumn, September in Ljubljana embraces a delightful blend of warmth and light with 318 hours of sunshine. This month, while offering a softer glow compared to the sun-drenched days of July, still holds plenty of bright moments, attracting both locals and visitors to enjoy the city's charming outdoor cafés and picturesque landscapes. Comparatively, September's sunshine lingers comfortably above the more subdued tones of October and the drastically lower hours in the colder months that follow, setting the stage for a serene transition into fall. With the sun still shining brightly, September stands as a beautiful reminder of the lingering summer days while hinting at the cozy comforts of the approaching season.
As September arrives in Ljubljana, Slovenia, the chance of sunny weather significantly brightens up the horizon, boasting a promising 51% likelihood of sunshine. This marks a slight increase compared to the preceding summer months, such as July (46%) and August (44%), indicating that the early autumn days often offer a delightful balance of warmth and pleasant skies. Furthermore, September stands out as it approaches the more unpredictable months ahead, illustrating a trend where the chances of sun gradually decline as the year progresses. With the vivid colors of fall beginning to emerge, September in Ljubljana beckons visitors to relish both the sunshine and the stunning scenery.
As summer transitions to autumn in Ljubljana, Slovenia, September brings a gentle decline in daylight, offering approximately 12 hours of sun. This marks a noticeable shift from the height of summer, where daylight peaked at 15 hours in June and July. The gradual reduction in daylight hours is reflective of the changing seasons, as the city bids farewell to the warmth of summer and welcomes the crisp air of fall. With September's luminous days, residents can still enjoy the balanced beauty of early autumn, as the evenings gradually draw in, paving the way for the shorter days of October and November ahead.
As the vibrant month of September arrives in Ljubljana, the city's atmosphere is gently stirred by an average wind speed of 1.8 m/s (4 mph), marking a slight increase from the summer's calm breezes. This refreshing air, while still mild, signals the transition towards autumn, reflecting a subtle uptick in wind activity compared to the languid July and August months. The consistency of the wind speeds in the warmer months—hovering around 1.6 to 1.8 m/s—suggests a stable climate, providing a pleasant backdrop for outdoor activities. As September unfolds, residents and visitors alike can relish in the serene yet invigorating winds, perfect for leisurely strolls through the enchanting streets of Slovenia's capital.
Weather in Ljubljana varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in Ljubljana, focusing on differences in temperature, rainfall, humidity, and UV levels.
September's weather is characterized by a wider temperature range, with minimums around 2°C (35°F) and maximums reaching 29°C (85°F), creating a pleasant average of 16°C (61°F). However, the month is also quite rainy, receiving 159 mm (6.3 in) of precipitation over 12 days, while humidity hovers at 64%. In contrast, January experiences much colder temperatures, with minimums plummeting to -12°C (11°F) and an average temperature of just 1°C (34°F). The winter month sees less rainfall, recording only 51 mm (2.0 in) over 7 days, though it has a higher humidity level of 88%. For more detailed information about January weather, you can visit Ljubljana weather in January.
In September, temperatures in Ljubljana range from a brisk minimum of 2°C (35°F) to a warm maximum of 29°C (85°F), with an average of 16°C (61°F). The month sees considerable rainfall, averaging 159 mm (6.3 in) over about 12 days, and humidity levels hover around 64%. Conversely, February presents a stark contrast with much colder temperatures, dipping to a minimum of -11°C (13°F) and peaking at 19°C (67°F), averaging only 4°C (39°F). Although February has less precipitation at 88 mm (3.5 in) over 9 days, the humidity is notably higher at 82%. For more detailed information, you can explore Ljubljana weather in February.
In comparing September and March weather, September showcases a broader temperature range with a minimum of 2°C (35°F) and a pleasant average of 16°C (61°F), reaching up to a warm 29°C (85°F). Precipitation is relatively high at 159 mm (6.3 in) over 12 days, accompanied by a humidity level of 64%. Conversely, March experiences colder temperatures, with a minimum of -14°C (8°F) and an average of 6°C (43°F), peaking at 22°C (71°F). Although March has lower total precipitation of 71 mm (2.8 in) spread over 10 days, it also features slightly higher humidity at 73%. For more detailed insights about weather conditions, check out Ljubljana weather in March.
When comparing the weather between September and April, notable differences emerge in both temperature and precipitation. September typically enjoys milder weather with average temperatures ranging from a minimum of 2°C (35°F) to a maximum of 29°C (85°F), resulting in a comfortable average of 16°C (61°F). In contrast, April experiences colder conditions, with temperatures ranging from a minimum of -11°C (13°F) to a peak of 26°C (79°F) and an average of only 10°C (51°F).
Precipitation levels also vary, as September sees 159 mm (6.3 in) over 12 days, while April has a lower total of 94 mm (3.7 in) across the same number of days. Additionally, humidity is generally higher in April at 73%, compared to 64% in September. For more details on April weather in Ljubljana, visit Ljubljana weather in April.
September and May offer distinct weather characteristics, though both months experience mild temperatures. In September, the minimum temperature hovers around 2°C (35°F), with an average of 16°C (61°F) and a maximum reaching 29°C (85°F). This month typically sees about 159 mm (6.3 in) of precipitation over 12 days, with humidity averaging 64%. In contrast, May features slightly cooler temperatures, with a minimum of 1°C (34°F), an average of 14°C (58°F), and a maximum of 28°C (82°F). While precipitation is slightly higher at 166 mm (6.5 in), it spans over more days, totaling 19 days, contributing to a higher humidity level of 70%. For those curious about what to expect during May, further details can be found at Ljubljana weather in May.
September weather tends to be cooler compared to June, with temperatures ranging from a minimum of 2°C (35°F) to a maximum of 29°C (85°F), averaging around 16°C (61°F). In contrast, June enjoys warmer temperatures, with a range from a minimum of 6°C (43°F) to a maximum of 34°C (94°F), averaging 20°C (68°F). While both months experience precipitation over 12 days, September sees more rainfall at 159 mm (6.3 in) compared to June's 84 mm (3.3 in). Additionally, humidity levels in June are slightly higher at 69%, compared to September's 64%. For more details, check out Ljubljana weather in June.
September generally experiences cooler temperatures compared to July, with average lows of 2°C (35°F) rising to a maximum of 29°C (85°F), while July enjoys milder nights and warmer days, with temperatures ranging from a minimum of 10°C (51°F) to a maximum of 34°C (93°F). Both months experience significant precipitation; however, September is wetter with 159 mm (6.3 in) over 12 days, compared to July's 98 mm (3.9 in) over 13 days. Humidity levels remain similar, around 64% in September and 63% in July. For a more detailed look at July's climate specifics, check out Ljubljana weather in July.
In September, the weather features a broader temperature range with minimums dropping to 2°C (35°F) and maximums reaching up to 29°C (85°F), compared to August, which has milder minimums at 8°C (47°F) and higher maximums of 35°C (96°F). While September experiences more frequent rainfall, totaling 159 mm (6.3 in) over 12 days, August sees less precipitation at 100 mm (3.9 in) over the same number of days. Additionally, humidity rises significantly in September to 64%, compared to the more comfortable 51% experienced in August. For those interested in detailed weather patterns, more information can be found at Ljubljana weather in August.
September and October exhibit notable differences in weather patterns. In September, temperatures range from a minimum of 2°C (35°F) to a maximum of 29°C (85°F), with an average of 16°C (61°F), reflecting the warmth of late summer. The month also sees significant precipitation of 159 mm (6.3 in) over 12 days, with a humidity level of 64%. In contrast, October experiences cooler temperatures, ranging from a minimum of 0°C (31°F) to a maximum of 24°C (76°F), averaging 11°C (52°F). Additionally, precipitation declines to 98 mm (3.9 in) over 9 days, alongside an increase in humidity to 83%. For more detailed insights, you can check Ljubljana weather in October.
September weather is characterized by milder temperatures, with averages around 16°C (61°F) and a maximum of 29°C (85°F), creating a warm and pleasant atmosphere. In contrast, November brings cooler temperatures, with an average of 6°C (44°F) and nighttime lows dipping to -6°C (22°F), indicating the onset of winter. Despite slightly less precipitation in November at 131 mm (5.2 in) compared to September's 159 mm (6.3 in), the increased humidity of 89% in November adds to the brisk chill in the air. For more detailed information, visit Ljubljana weather in November.
September and December present stark contrasts in weather. In September, temperatures range from a cool 2°C (35°F) at night to a warm 29°C (85°F) during the day, with an average of 16°C (61°F). The month sees a fair amount of precipitation with 159 mm (6.3 in) over about 12 days, and humidity levels at a comfortable 64%. In contrast, December brings much colder conditions, with temperatures dropping to a minimum of -15°C (6°F) and only reaching a maximum of 14°C (58°F), resulting in an average of just 2°C (36°F). Although December has less precipitation at 121 mm (4.8 in) over 10 days, the humidity rises to a notable 88%. For more detailed insights on December weather, you can visit Ljubljana weather in December.
As September arrives in Ljubljana, the city begins to transition from the warmth of summer into the crisp embrace of autumn. Temperatures gradually cool down, with pleasant days that can still reach a maximum of 29°C (85°F), while the nights start to hint at the chill to come. This month sees a notable increase in precipitation, with September experiencing more rainy days compared to the dry summer months, leading to an average of 159 mm over approximately 12 days. The humidity remains comfortable at around 64%, making it a lovely time to explore the city's stunning scenery. For a deeper understanding of how Ljubljana's weather shifts throughout the year, visit Ljubljana Climate.