Last updated: August 27, 2025
Kostanjevica na Krki experiences a vibrant September, where temperatures range from a balmy maximum of 33°C (92°F) to a refreshing minimum of 3°C (38°F), highlighting the seasonal transition. The average temperature settles at a comfortable 17°C (63°F), making it an inviting time for outdoor activities. However, visitors should be prepared for the 120 mm (4.7 in) of precipitation that typically graces the region over 10 days, contributing to the lush landscapes. With a humidity level of 62%, the air feels pleasantly crisp, making September a balanced month for both exploration and relaxation in this picturesque Slovene locale.
September in Kostanjevica na Krki marks a delightful transition as summer wanes and autumn approaches. With temperatures ranging from a low of 3°C (38°F) to a comfortable high of 33°C (92°F), this month offers a perfect blend of warmth and cooler breezes. The average temperature settles at 17°C (63°F), providing ideal conditions for outdoor activities and exploration of the stunning natural surroundings. As the summer heat gently recedes, the vibrant colors of the early autumn begin to emerge, making September a picturesque time to experience the charm and beauty of Slovenia's enchanting landscapes.
In September, Kostanjevica na Krki experiences a notable uptick in precipitation, with 120 mm (4.7 in) recorded over 10 days of rainfall. This surge marks a peak for the summer, highlighting the transition into autumn's wetter climate. The increase in rainfall compared to August's 89 mm suggests a shift in weather patterns, as the region gears up for the cooler months ahead. This seasonal variation is consistent with the overall trend observed throughout the year, where spring and early summer see less precipitation, but late summer and early autumn witness a significant rise, culminating in a lush landscape poised for the changing season.
As summer gives way to autumn, September in Kostanjevica na Krki experiences a noticeable shift in humidity, settling at 62%. This marks a slight increase from the low of 51% in August, signaling the return of moisture to the air. Throughout the year, humidity levels typically range from a high of 89% in January to a low of 64% in July, showcasing a clear seasonal pattern. As temperatures begin to cool, September serves as a gentle precursor to the wetter months ahead, with October projected to rise significantly to 81%. Overall, the transition from summer's dryness to the more humid conditions of fall reflects the dynamic climate of this charming Slovenian town.
As September unfolds in Kostanjevica na Krki, Slovenia, outdoor enthusiasts can expect a high UV Index of 6, indicating a significant need for sun protection despite the seasonal transition. This marks a decline from the peak summer months, where UV levels hit a very high 9 in July and June, leading to shorter burn times of just 15 minutes. September’s conditions allow for a more generous 25 minutes of safe sun exposure, aligning more closely with the moderate levels observed in the earlier months of the year. The gradual decrease in UV intensity suggests that while summer's bold sunlight may be fading, it’s still essential to take precautions when basking under Kostanjevica's clear skies. For further details on UV levels throughout the year, check out the Kostanjevica na Krki UV Index.
UV Risk Categories
In Kostanjevica na Krki, Slovenia, September stands out as a remarkable month, showcasing the beauty of late summer with an impressive 323 hours of sunshine. This not only indicates a slight decline from the sun-drenched peak of July but also maintains a robust amount of sunlight that rivals the energetic months of spring. The trend reveals a gradual transition into autumn, as the hours of sunshine begin to taper off after the summer highs, yet still provide ample opportunity to bask in the warmth. With each passing month, the amount of sunlight gently decreases, reminding us of the cyclical nature of the seasons, yet September's glow lingers, ushering in the golden hues of fall.
In Kostanjevica na Krki, the likelihood of sunny weather in September stands at a promising 53%, making it one of the more favorable months for sunshine compared to the latter half of the year. As summer transitions into fall, this percentage reflects a noticeable consistency, particularly when juxtaposed with the sunniest months of June (56%) and July (49%). September's sunshine likelihood slightly dips but remains favorable, unlike the dramatic decreases in likelihood seen in October (36%) and the winter months, which generally hover in the low twenties. This trend suggests that while September marks the beginning of autumn, the warm and inviting days linger just long enough for residents and visitors to enjoy the beauty of Slovenia's landscape under a radiant sun.
As summer fades into autumn in Kostanjevica na Krki, Slovenia, the cheerful daylight hours witness a gradual decline in September, offering around 12 hours of sunlight each day. This marks a gentle transition from the longer days of the vibrant summer months, which peak at 15 hours in June and July. Following September, daylight continues to dwindle into October, where it dips to 10 hours, ultimately trailing into the winter months. This rhythmic ebb and flow of daylight not only reflects the changing seasons but also invites the community to embrace the cozy charm of fall as they prepare for the shorter days ahead.
As September rolls into Kostanjevica na Krki, the gentle whispers of the wind continue to weave a tranquil atmosphere, with average speeds dipping to 1.5 m/s (3 mph). This month reflects a consistent pattern observed throughout the warmer seasons, where the winds are generally softer, contrasting the slightly brisker breezes of earlier months like October and March. With summer’s embrace lingering, September brings a serene calmness, mirroring the idyllic landscapes and historical charm of this picturesque Slovenian town. As the days grow shorter, the subtle winds invite both locals and visitors alike to savor these peaceful moments, marking the transition into autumn with grace.
Weather in Kostanjevica na Krki varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in Kostanjevica na Krki, focusing on differences in temperature, rainfall, humidity, and UV levels.
September and January present starkly contrasting weather conditions. In September, temperatures range from a minimum of 3°C (38°F) to a pleasant average of 17°C (63°F), peaking at a maximum of 33°C (92°F) on warmer days, accompanied by 120 mm (4.7 in) of precipitation over about 10 days and a humidity level of 62%. In contrast, January's climate is decidedly colder, with temperatures plummeting to a minimum of -15°C (6°F), creeping up to an average of 1°C (34°F) and a high of only 16°C (61°F). This month sees significantly less precipitation, totaling 45 mm (1.8 in) across 8 days, and a notably higher humidity of 89%. For a more detailed look at the January weather in this region, you can explore Kostanjevica na Krki weather in January.
In September, temperatures in Kostanjevica na Krki range from a cool 3°C (38°F) to a warm 33°C (92°F), with an average of 17°C (63°F). This month experiences around 120 mm (4.7 in) of precipitation over 10 days and has a relatively moderate humidity level of 62%. In contrast, February brings much colder conditions, with temperatures dipping as low as -11°C (12°F) and peaking at 21°C (69°F), averaging just 4°C (40°F). The month sees less precipitation at 70 mm (2.7 in) over 9 days, but a higher humidity level of 83%. For a detailed look at February weather, visit Kostanjevica na Krki weather in February.
The weather in September is generally warmer compared to March, with average temperatures ranging from a mild 17°C (63°F) to a hot 33°C (92°F), while March experiences cooler averages of around 7°C (45°F), with lows dipping to -15°C (6°F). September also sees significantly more precipitation, totaling 120 mm (4.7 in) over about 10 days, while March has a considerably lighter rainfall of 56 mm (2.2 in) during the same number of days. Additionally, humidity is slightly lower in September at 62%, compared to the higher levels of 75% experienced in March. For more detailed information on the weather in this month, you can check out Kostanjevica na Krki weather in March.
When comparing the weather of September and April, we notice a significant contrast in temperatures and conditions. In September, the temperatures range from a minimum of 3°C (38°F) to a maximum of 33°C (92°F), with an average of 17°C (63°F). This month experiences higher humidity at 62% and more precipitation, totaling 120 mm (4.7 inches) over approximately 10 days. In contrast, April is much cooler, with temperatures ranging from a low of -9°C (16°F) to a high of 28°C (83°F) and an average of 12°C (53°F). Though April has less total rainfall at 76 mm (3.0 inches) over the same number of days, it features a slightly higher humidity level of 72%. For more details on April's climate, you can find additional information here: Kostanjevica na Krki weather in April.
When comparing the weather between September and May, a few notable differences emerge. In September, temperatures can range from a minimum of 3°C (38°F) to a maximum of 33°C (92°F), with an average of 17°C (63°F). The month typically experiences about 120 mm (4.7 in) of precipitation over 10 days, with a humidity level of 62%. In contrast, May features slightly cooler temperatures, with a minimum of 2°C (36°F) and a maximum of 31°C (88°F), averaging around 16°C (61°F). This month tends to be wetter, seeing approximately 140 mm (5.5 in) of rain over 18 days, coupled with higher humidity at 70%. For more details about May weather specifics, you can visit Kostanjevica na Krki weather in May.
In comparing the weather of September and June, June tends to be warmer overall, with average temperatures reaching 21°C (70°F) compared to September's average of 17°C (63°F). June also sees a higher maximum temperature, peaking at 36°C (97°F) versus September's maximum of 33°C (92°F). However, September experiences more significant rainfall, accumulating 120 mm (4.7 in) over approximately 10 days, while June has 93 mm (3.7 in) spread over 12 days. Humidity levels are slightly higher in June at 69%, compared to 62% in September. For a detailed look at how these weather patterns play out, you can check Kostanjevica na Krki weather in June.
When comparing the weather in September to that of July, distinct differences emerge. September typically experiences a wider range of temperatures, with minimums dropping to 3°C (38°F) and maximums reaching up to 33°C (92°F), while the average temperature is a mild 17°C (63°F). In contrast, July boasts warmer temperatures, with minimums around 10°C (50°F), average highs of 22°C (72°F), and peaks at 36°C (96°F). Additionally, September receives more precipitation, totaling 120 mm (4.7 in) over about 10 days, compared to July's 93 mm (3.7 in) over 12 days. Humidity levels are relatively similar, with September at 62% and July slightly higher at 64%. For more details, you can visit Kostanjevica na Krki weather in July.
In comparing the weather conditions of September and August, September is characterized by a significant drop in minimum temperatures, with lows around 3°C (38°F) compared to August's 8°C (48°F). The average temperature also declines from 22°C (73°F) in August to 17°C (63°F) in September. While maximum temperatures in August can reach as high as 39°C (103°F), September sees a peak of 33°C (92°F), indicating a gradual transition into cooler weather. Additionally, September experiences more precipitation, totaling 120 mm (4.7 in) over 10 days, compared to August's 89 mm (3.5 in) over 11 days. Humidity levels are also higher in September at 62%, contrasting with August’s 51%. For a detailed look at weather specifics in August, you can visit Kostanjevica na Krki weather in August.
September's weather presents a wide range of temperatures, with nighttime lows reaching 3°C (38°F) and daytime highs soaring up to 33°C (92°F), resulting in an average temperature of 17°C (63°F). In contrast, October experiences cooler conditions, with temperatures dropping further to a minimum of 0°C (32°F) and an average of 12°C (54°F), peaking at a maximum of 26°C (78°F). While September sees 120 mm (4.7 in) of precipitation over 10 days, October brings a slightly lower total of 93 mm (3.7 in) across 9 days, accompanied by higher humidity at 81%. For more details on October's climate, refer to Kostanjevica na Krki weather in October.
September and November present striking contrasts in weather. In September, temperatures range from a mild 3°C (38°F) at night to a warm 33°C (92°F) during the day, with an average of 17°C (63°F). The month sees about 120 mm (4.7 in) of precipitation over approximately 10 days, and humidity sits at a moderate 62%. In contrast, November brings a notable chill, with nighttime temperatures dropping to -4°C (25°F) and daytime highs reaching only up to 21°C (69°F), averaging around 7°C (45°F). Although November has slightly less precipitation at 99 mm (3.9 in), it comes over 12 days, and the humidity is significantly higher at 87%. For more details on the specific weather patterns in November, you can refer to Kostanjevica na Krki weather in November.
September and December exhibit striking differences in weather patterns. In September, temperatures range from a minimum of 3°C (38°F) to a maximum of 33°C (92°F), with an average of 17°C (63°F). This month sees relatively moderate precipitation of 120 mm (4.7 in) over about 10 days, accompanied by a humidity level of 62%. In contrast, December brings much colder temperatures, with minimums dropping to -9°C (16°F) and maximums reaching only 18°C (65°F), resulting in an average temperature of just 3°C (38°F). While precipitation is slightly lower at 96 mm (3.8 in) over 11 days, humidity rises significantly to 88%. For more details, you can check Kostanjevica na Krki weather in December.
As September unfolds in Kostanjevica na Krki, the weather begins to shift, marking a transition towards the cooler months. With an average temperature significantly lower than the peak summer months, the warmth still lingers, allowing residents and visitors to enjoy pleasant days. However, the increased precipitation and a notable number of rainy days suggest a more variable climate, distinct from the drier summer. This blend of mild temperatures and occasional showers contributes to the region's lush scenery, enhancing the beauty of early autumn. For a deeper insight into what to expect throughout the year, explore the detailed information at Kostanjevica na Krki Climate.