Last updated: August 27, 2025
In September, Slovenia experiences a delightful transition from the warmth of summer to the cooler embrace of autumn. The month can see maximum temperatures soaring up to 29°C (85°F), while the average settles at a comfortable 16°C (61°F). As night falls, temperatures may dip to a brisk 2°C (35°F). With 159 mm (6.3 in) of precipitation over approximately 12 days, the lush landscapes are nourished, contributing to Slovenia's stunning natural beauty. The humidity levels, around 64%, add a refreshing touch, making September an inviting time to explore the scenic wonders of this enchanting country.
In September, Slovenia experiences a delightful transition from the summer heat to the crispness of autumn. The temperatures range from a minimum of 2°C (35°F) to a maximum of 29°C (85°F), with a comfortable average of 16°C (61°F). This month marks a noticeable drop from the sweltering heights of August, where temperatures can soar to 35°C (96°F), yet still maintains a pleasant warmth during the day. As summer’s last warm embrace fades, the cooler evenings offer a refreshing contrast, inviting you to explore Slovenia's stunning landscapes and vibrant autumn foliage. With such favorable conditions, September stands out as a perfect time to experience the country’s natural beauty before the chill of winter sets in.
September in Slovenia marks a significant shift in precipitation patterns, with rainfall peaking at 159 mm (6.3 in) across 12 days. This is notable as it follows the drier summer months of July and August, both averaging around 100 mm. The increase in precipitation not only signals the onset of autumn but also contributes to the lush landscapes that Slovenia is known for. Such substantial rainfall in September hints at a transition, as the region prepares for the wetter months ahead, with October and November both averaging over 130 mm of rain. Overall, the trend reflects Slovenia's dynamic climate, where vibrant autumn colors are frequently accompanied by generous rain showers.
As summer transitions into autumn, September in Slovenia witnesses a noticeable shift in humidity, averaging 64%. This marks an increase from the drier August, which boasted a significantly lower humidity level of 51%. While still relatively comfortable, September's humidity begins to inch upwards, hinting at the wetter months ahead. In fact, the trend for the rest of the year sees a steady rise, culminating in the more saturated conditions of October, which spikes back up to 83%. Thus, September serves as a pivotal point, bridging the dry warmth of summer and the damp chill that characterizes Slovenia’s later months.
As summer gives way to autumn in Slovenia, September sees a notable UV Index of 7, classifying the sun exposure as high. This marks a gentle decline from the peak months of July and August, both of which boasted a UV Index of 9, categorizing them as very high, with a minimal burn time of just 15 minutes. Interestingly, the burn time in September extends back to 25 minutes, highlighting an opportunity for outdoor activities while still being mindful of sun safety. As the sun’s intensity begins to wane heading into October, with a subsequent drop to an Index of 5, it's essential to stay informed and prepared by checking the daily UV exposure trends. For further details, visit UV Index.
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September in Slovenia is a delightful transition from the summer's brilliance, basking in 318 hours of sunshine. This month sees a graceful tapering from the peak sunlight of July, where the sun illuminates for an impressive 427 hours. As the gentle warmth of summer begins to fade, September offers a perfect blend of bright days and cooler evenings, making it an ideal time for outdoor adventures. Interestingly, the sunshine hours in September still outshine the earlier months of January through April, reflecting a lingering vibrancy before autumn sets in. As the days grow shorter and the sun dips lower in the sky, the landscape transforms into a tapestry of rich autumn hues, inviting visitors to experience its serene beauty.
September in Slovenia offers a 51% chance of sunny weather, marking a delightful transition from the summer months. As the year progresses, there is a noticeable increase in sunny days from the dreary winter months, with March kicking off the trend at 58% and June following closely at 53%. While July and August see slightly lower percentages, September maintains a respectable level of sunshine, making it an ideal time for outdoor activities and exploration. This uptick in pleasant weather aligns with nature’s gradual shift from the vibrant warmth of summer towards the cooler embrace of autumn, inviting locals and tourists alike to bask in the lingering sun before the seasonal changes take hold.
As summer gives way to autumn in Slovenia, September brings a gentle transition in daylight duration, offering around 12 hours of natural light each day. This marks a noticeable decrease from the sun-drenched days of July and August, which boast up to 15 hours of daylight. The gradual shift from the long days of summer highlights the progression toward shorter daylight hours, a trend that continues into October with only 10 hours remaining. Although September's daylight is less than the enchanting summer months, it still captures the beauty of early fall, where the vibrant landscapes start to transform in preparation for the quieter months ahead.
As September unfolds in Slovenia, the average wind speed settles at a gentle 1.8 m/s (4 mph), slightly higher than the preceding summer months. This calmness reflects a subtle transition from the mellow breezes of summer, gradually paving the way for autumn’s arrival. Notably, the wind speeds during this month are consistent with the patterns observed in July and August, indicating a seasonal lull before stronger gusts re-emerge in October at 2.2 m/s (5 mph). Overall, September serves as a serene bridge, where the refreshing winds whisper the promise of the vibrant fall season ahead.
Weather in varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in , focusing on differences in temperature, rainfall, humidity, and UV levels.
September and January present stark contrasts in weather conditions. In September, temperatures range from a mild 2°C (35°F) at night to a pleasant maximum of 29°C (85°F) during the day, with an average of 16°C (61°F). The month experiences around 159 mm (6.3 in) of precipitation over about 12 days, while humidity hovers at 64%. In stark contrast, January sees much colder temperatures, with a minimum of -12°C (11°F), averaging just 1°C (34°F), and peaking at 12°C (54°F). Precipitation is significantly lower, at 51 mm (2.0 in) over 7 days, yet humidity rises to 88%. For a detailed look into January's weather conditions, you can refer to the following link: weather in January.
September offers a more moderate climate with temperatures ranging from a cool 2°C (35°F) to a warm 29°C (85°F) and an average of 16°C (61°F). The month experiences substantial precipitation at 159 mm (6.3 in) over about 12 days, coupled with a comfortable humidity level of 64%. In contrast, February brings a chillier atmosphere, with temperatures dropping to a minimum of -11°C (13°F) and peaking at 19°C (67°F), averaging around 4°C (39°F). Although precipitation is lower at 88 mm (3.5 in) over 9 days, the humidity is notably higher at 82%, contributing to a brisk feel. For more details, you can check the weather in February.
September and March present quite contrasting weather conditions. In September, temperatures range from a chilly 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 is marked by 159 mm (6.3 in) of rainfall spread over 12 days, accompanied by a relative humidity of 64%. In contrast, March experiences much colder conditions, with temperatures dipping as low as -14°C (8°F) and peaking at 22°C (71°F), averaging around 6°C (43°F). Precipitation is significantly lower at 71 mm (2.8 in) over 10 days, though humidity is slightly higher at 73%. For a more detailed look into the weather patterns, you can check the weather in March.
When comparing the weather in September and April, notable differences emerge in temperature and precipitation. September typically experiences milder temperatures, ranging from a minimum of 2°C (35°F) to a maximum of 29°C (85°F), with an average temperature of 16°C (61°F). In contrast, April is cooler, with temperatures dipping as low as -11°C (13°F) and reaching highs of 26°C (79°F), averaging around 10°C (51°F). Although both months see about 12 days of precipitation, September accumulates more rain at 159 mm (6.3 in) compared to April's 94 mm (3.7 in). Additionally, April has higher humidity levels at 73% versus September's 64%. For a closer look at April's specific conditions, check out weather in April.
In September, the weather typically sees a wider temperature range, with a minimum of 2°C (35°F) and an average high of 29°C (85°F), making it generally warmer than May. In contrast, May has a slightly lower temperature range, with a minimum of 1°C (34°F) and an average high of 28°C (82°F). Both months experience significant precipitation, but September has 159 mm over 12 days, while May records 166 mm over 19 days, indicating that May experiences wetter conditions more often. Additionally, May tends to be more humid, with humidity levels at 70%, compared to 64% in September. For more detailed information, check out the weather in May.
September weather tends to offer a more varied temperature range compared to June, with minimums dipping to around 2°C (35°F) and maximums reaching 29°C (85°F). In contrast, June has relatively milder nights, with minimum temperatures of 6°C (43°F) and daytime highs soaring up to 34°C (94°F). Precipitation in September is significantly higher, accumulating to 159 mm (6.3 in) over 12 days, while June experiences less rain, totaling 84 mm (3.3 in) across the same number of days. Humidity levels are slightly higher in June at 69%, compared to September's 64%. For more insights, check the detailed weather in June.
In comparing the weather of September and July, September tends to be cooler with temperatures ranging from a minimum of 2°C (35°F) to a maximum of 29°C (85°F) and an average of 16°C (61°F). In contrast, July is warmer, featuring temperatures that range from a minimum of 10°C (51°F) to a maximum of 34°C (93°F) and an average of 21°C (70°F). Additionally, September experiences more precipitation, totaling 159 mm (6.3 in) over 12 days, while July receives 98 mm (3.9 in) across 13 days. Both months exhibit similar humidity levels, with September at 64% and July at 63%. For more details on July weather, visit weather in July.
In comparing the weather of September to August, notable differences emerge. September sees a considerable drop in minimum temperatures, with lows of 2°C (35°F) compared to August's milder 8°C (47°F). While September offers a maximum temperature of 29°C (85°F), it is significantly cooler than August's peak of 35°C (96°F), resulting in an average temperature of 16°C (61°F) in September versus 21°C (70°F) in August. Additionally, September experiences more precipitation, accumulating 159 mm (6.3 in) over 12 days, in contrast to August's 100 mm (3.9 in) over the same number of days. The humidity also rises in September to 64%, compared to August's 51%. For a detailed look at August's weather patterns, you can check the weather in August.
September tends to be warmer than October, with average temperatures ranging from a minimum of 2°C (35°F) to a maximum of 29°C (85°F), while October sees a drop to a minimum of 0°C (31°F) and a maximum of 24°C (76°F). September also experiences higher average temperatures at around 16°C (61°F) compared to October's 11°C (52°F). In terms of precipitation, September is wetter, receiving 159 mm (6.3 in) across 12 days, whereas October has only 98 mm (3.9 in) over 9 days. Additionally, October has a higher humidity level of 83%, compared to September’s 64%. For more details, check out the weather in October.
September typically showcases a wider temperature range, with minimums around 2°C (35°F) and maximums reaching up to 29°C (85°F), averaging around 16°C (61°F). This month also experiences relatively lower humidity at 64% and more pleasant weather, despite receiving 159 mm (6.3 in) of precipitation over 12 days. In contrast, November presents cooler temperatures, with lows dipping to -6°C (22°F) and an average of only 6°C (44°F). While November sees slightly less precipitation at 131 mm (5.2 in) over 11 days, it compensates with significantly higher humidity levels at 89%. For more details, check the weather in November.
September and December present a stark contrast in weather conditions. 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). The month experiences about 159 mm (6.3 in) of precipitation over 12 days, and humidity levels sit at a comfortable 64%. In contrast, December is much colder, with temperatures dropping to a minimum of -15°C (6°F) and peaking at 14°C (58°F), averaging just 2°C (36°F). Despite slightly lower precipitation at 121 mm (4.8 in) over 10 days, the humidity notably increases to 88%. For a closer look at what December has to offer, check out the detailed weather in December.
As summer gently fades into autumn, September showcases a unique blend of warmth and cooling breezes. With average temperatures hovering around a comfortable 16°C, it offers a pleasant respite compared to the hotter months. However, the sky often graces us with clouds and rain, as the month sees about 12 days of precipitation, totaling 159 mm. This rainfall enhances the lushness of the landscape, making the scenery particularly vibrant. With a humidity level of 64%, the air carries the refreshing scent of approaching fall, setting the stage for the colorful transformations ahead. For more insights into how these patterns influence the local climate, visit Climate.