Last updated: August 27, 2025
In January, Postojna, Slovenia experiences a chilly climate characterized by an average temperature of 0°C (33°F), with maximums reaching 11°C (52°F) and minimums dropping to a frigid -14°C (7°F). The month sees a substantial 72 mm (2.8 in) of precipitation over approximately 8 days, contributing to a high humidity level of 88%. This blend of cold temperatures and moisture creates a distinct winter atmosphere, making it a unique time to experience the natural beauty and charm of Postojna.
In January, Postojna, Slovenia, experiences a considerable chill, with temperatures plunging to a minimum of -14°C (7°F), while averaging around 0°C (33°F) and peaking at a maximum of 11°C (52°F). This month stands out as the coldest of the year, setting the stage for a gradual warming trend as the seasons transition. February sees slightly milder temperatures, with lows of -12°C (10°F) and an average rising to 3°C (38°F). By March, winter's grip begins to loosen further, as temperatures fluctuate from a low of -17°C (2°F) to a high of 21°C (70°F), hinting at the arrival of spring. Overall, while January is marked by its stark cold, the subsequent months reflect a clear trajectory towards warmer conditions, allowing nature to awaken from its winter slumber.
In January, Postojna, Slovenia experiences moderate precipitation with an average of 72 mm (2.8 in) spread over approximately 8 days of rainfall. This sets the stage for a wetter trend as the year progresses, with precipitation increasing significantly in February to 128 mm (5.0 in), marking the start of the peak wet season. Following that, March and April maintain substantial rainfall, averaging 97 mm and 115 mm, respectively. The precipitation peaks in May, reaching 206 mm (8.1 in) over 20 days, which is indicative of the region's lush summer bloom. As the months roll into late summer and fall, Postojna’s rainfall remains consistent, with September seeing similar high amounts at 205 mm. Overall, January's modest start transitions into a month-to-month increase, reflecting the dynamic and lush climate that defines Postojna throughout the year.
January in Postojna, Slovenia, is characterized by high humidity levels, averaging a notable 88%. This moisture-laden air sets the tone for winter, as the region experiences some of its most humid days. Following January, a gradual decline is observed in February, where humidity decreases to 82%, continuing to drop through the spring months to 73% in both March and April. As the year progresses into the summer, humidity further decreases, hitting its annual low of 51% in August, which brings a slight reprieve from the dampness. However, as autumn approaches, humidity rises again, climbing to 89% by November. The cycle of humidity in Postojna underscores a clear seasonal pattern, highlighting the region's transition from a moist winter to a drier summer before returning to a more humid state in fall and winter. Each month tells a story of shifting weather patterns and the influence of seasonal changes on local climate.
In January, Postojna, Slovenia experiences a low UV Index of 2, allowing for nearly 45 minutes of safe sun exposure before any risk of skin damage occurs. As the month progresses into February and March, the UV Index rises modestly to 3 and 5 respectively, indicating a transition into a more moderate exposure category with a reduced burn time of 30 minutes. This gradual increase continues into the spring months, where April sees the UV Index peak at 7, requiring more diligent sun protection as burn time drops to 25 minutes. The trend intensifies from May through August, with UV levels soaring to very high values of 8 and 9, drastically shortening burn time to just 15 minutes. As summer fades into fall, the UV Index starts to decline again, ranging from high to moderate in the subsequent months. By the end of the year, December returns to a low UV Index of 2, echoing the conditions seen in January. This cyclical pattern underscores the importance of sun safety throughout the year, especially during the peak months. For more details on the UV Index in Postojna, visit Postojna UV Index.
UV Risk Categories
In Postojna, Slovenia, January marks the beginning of the year with 179 hours of sunshine, setting the stage for gradual growth in brightness as the seasons shift. As we transition into February, the sun graces the region for 224 hours, hinting at the approaching spring. By March, the sunshine flourishes, reaching 313 hours, while April continues the trend with 337 hours, embedding the promise of longer days. This upward trajectory peaks in the summer months, with July basking in a radiant 429 hours. However, as autumn rolls in, the numbers begin to recede, with sunlight tapering off to 322 hours in September and further down to 211 hours by December. This rhythm of increasing and decreasing daylight not only signifies the changing seasons but also paints a vibrant picture of Postojna's yearly evolution under the sun.
In Postojna, Slovenia, January offers a modest 22% chance of sunny weather, making it one of the cloudier months of the year. This trend of limited sunshine begins to shift dramatically in February as the likelihood increases to 33%, suggesting a gradual transition toward brighter days. By March, the sun shines significantly more often, with a 58% chance, heralding the arrival of spring. This upward trajectory continues through the months, peaking in September with a 54% chance, before tapering off again into the cooler, cloudier seasons. Thus, while January is relatively drab in terms of sunshine, it sets the stage for a hopeful progression toward sunnier conditions as winter unfolds into spring.
In Postojna, Slovenia, January marks the beginning of gradual daylight expansion, with approximately 9 hours of sunlight that gradually increases as the months progress. By February, the daylight stretches to 10 hours, paving the way for the more generous hours of spring. March welcomes 11 hours, while April shines with 13 hours, hinting at the vibrant life that blooms with increasing warmth. May and June delight with 14 and 15 hours of long, sun-soaked days, epitomizing the essence of summer. This peak in daylight continues into July before a gentle decline begins in August, dropping back to 14 hours. As fall sets in, daylight diminishes, tapering to 12 hours in September and further retreating to 10 hours by October. The year closes with January returning to 9 hours, a cycle that beautifully reflects the seasonal rhythms of Postojna’s picturesque landscape.
In Postojna, Slovenia, January brings an average wind speed of 2.5 m/s (5 mph), perfectly in line with the calmer atmosphere of late autumn and early winter. As winter wears on, February sees a slight uptick to 2.9 m/s (6 mph), hinting at a playful breeze that complements the chilly air. This trend fizzles out in March, where winds drop again to 2.3 m/s (5 mph), before stabilizing at 2.5 m/s (6 mph) through the spring months. Interestingly, the summer months bring a slight lull, with June dipping to its lowest at 1.8 m/s (4 mph), creating a serene environment. Come October, however, winds pick up noticeably to 3.0 m/s (7 mph), signaling the onset of autumn. This fluctuation throughout the year showcases Postojna’s dynamic weather, with January serving as a gentle start to the seasonal dance of winds.
Weather in Postojna varies notably across the year, with each month offering distinct climate conditions. This page compares January’s weather to other months in Postojna, focusing on differences in temperature, rainfall, humidity, and UV levels.
January and February exhibit notable differences in weather patterns. While January sees a frigid minimum temperature of -14°C (7°F) and an average of 0°C (33°F), February experiences slightly milder conditions with a minimum of -12°C (10°F) and an average of 3°C (38°F). In terms of maximum temperatures, February reaches up to 19°C (67°F), compared to January's peak of 11°C (52°F). Precipitation is also more abundant in February, with 128 mm (5.0 in) over 10 days, compared to January's 72 mm (2.8 in) over 8 days. Despite the higher precipitation, February has a slightly lower humidity level at 82%, compared to January's 88%. For more detailed information on February weather, check out Postojna weather in February.
In January, the weather can be quite cold, with temperatures ranging from a minimum of -14°C (7°F) to a maximum of 11°C (52°F) and an average of 0°C (33°F). The month experiences about 72 mm (2.8 in) of precipitation over approximately 8 days, coupled with high humidity at 88%.
In contrast, March brings a noticeable increase in temperatures, with nighttime lows dropping to -17°C (2°F) and daytime highs reaching up to 21°C (70°F), giving an average of 5°C (42°F). Precipitation also rises to 97 mm (3.8 in) over 11 days, but humidity decreases to 73%. For more detailed insights on March weather, you can check out Postojna weather in March.
January and April present contrasting weather patterns. In January, temperatures can drop to a minimum of -14°C (7°F), with an average around 0°C (33°F) and a maximum reaching 11°C (52°F). The month experiences about 72 mm (2.8 in) of precipitation over 8 days, accompanied by high humidity levels of 88%. In contrast, April brings a significant warming trend, with temperatures ranging from -10°C (14°F) to a pleasant maximum of 25°C (78°F) and an average of 10°C (50°F). However, it is also wetter, recording 115 mm (4.5 in) of precipitation across 12 days and lower humidity at 73%. To learn more about how the weather trends change in April, you can visit Postojna weather in April.
In January, temperatures in Postojna can be quite frigid, ranging from a minimum of -14°C (7°F) to a pleasant maximum of 11°C (52°F), with an average temperature around 0°C (33°F). This month sees an average humidity of 88% and experiences about 72 mm (2.8 in) of precipitation spread over 8 days. In contrast, May brings a significant warming trend, with average temperatures rising to 14°C (57°F) and highs reaching up to 26°C (79°F). Although May's weather is milder, it also experiences more rainfall, totaling 206 mm (8.1 in) over 20 days, and lower humidity at 70%. For more details on May weather, check out this link: Postojna weather in May.
January and June present starkly contrasting weather conditions. In January, temperatures can plunge to a minimum of -14°C (7°F), with an average of around 0°C (33°F) and a maximum of 11°C (52°F). The month is characterized by high humidity at 88% and relatively low precipitation of 72 mm (2.8 in) over approximately eight days. In contrast, June enjoys significantly warmer weather, with minimum temperatures of 6°C (44°F), an average of 19°C (67°F), and peaks reaching up to 35°C (95°F). Although June experiences more precipitation at 110 mm (4.3 in) over about twelve days, the humidity is notably lower at 69%. For more details on the weather in June, you can check Postojna weather in June.
January and July present stark contrasts in weather conditions. In January, temperatures can plunge to as low as -14°C (7°F), with an average around 0°C (33°F) and a maximum reaching only 11°C (52°F). This cold month also experiences significant humidity at 88% and receives about 72 mm (2.8 in) of precipitation over 8 days. Conversely, July boasts a much warmer climate, with temperatures ranging from a minimum of 9°C (48°F) to a maximum of 33°C (91°F), averaging 20°C (68°F). Rainfall is more abundant in July, totaling 130 mm (5.1 in) over 14 days, but the humidity drops to a comfortable 63%. For a more detailed look at July weather in Postojna, visit Postojna weather in July.
January and August represent stark contrasts in weather. In January, temperatures can plummet to a minimum of -14°C (7°F), with an average of 0°C (33°F) and a maximum of 11°C (52°F). The month is characterized by high humidity at 88%, and it experiences about 72 mm (2.8 in) of precipitation over 8 days. In contrast, August sees much warmer temperatures, with a minimum of 9°C (48°F), an average of 20°C (69°F), and a peak of 34°C (93°F). The humidity drops to 51%, and the month accumulates 126 mm (5.0 in) of precipitation over 13 days. For more detailed insights, check out Postojna weather in August.
In January, temperatures are quite frigid, with a minimum of -14°C (7°F) and an average around freezing at 0°C (33°F), while the maximum only reaches 11°C (52°F). The month experiences fairly low humidity at 88% and precipitation amounting to 72 mm (2.8 in) over about 8 days. In contrast, September offers a significant warming, with temperatures ranging from a minimum of 2°C (36°F) to a maximum of 28°C (83°F), and an average of 15°C (60°F). Precipitation is also higher in September, totaling 205 mm (8.1 in) over 13 days, but the humidity drops to a more comfortable 64%. For more specific details about September weather, you can check Postojna weather in September.
January and October exhibit striking differences in weather patterns. In January, temperatures can drop as low as -14°C (7°F), with an average of 0°C (33°F) and a maximum of 11°C (52°F), making it the coldest month of the year. The humidity is relatively high at 88%, and the region experiences 72 mm (2.8 in) of precipitation over about 8 days. In contrast, October offers a milder climate with minimum temperatures at 0°C (32°F) and averages reaching 11°C (52°F), peaking at 23°C (73°F). Though it is slightly wetter, with 127 mm (5.0 in) of precipitation over 10 days, the humidity is somewhat lower at 83%. This shift indicates a transition from winter's chill to the more temperate fall conditions. For more detailed insights, you can visit Postojna weather in October.
When comparing January and November weather, it is evident that January presents a colder and less humid climate. In January, temperatures range from a minimum of -14°C (7°F) to a maximum of 11°C (52°F), with an average of 0°C (33°F), while November enjoys slightly milder temperatures ranging from -9°C (16°F) to 18°C (65°F), averaging 6°C (43°F). Additionally, November experiences significantly higher precipitation, with 176 mm (6.9 in) over 12 days, compared to January's 72 mm (2.8 in) over just 8 days. Both months have high humidity, with January at 88% and November at 89%. For more detailed weather information in November, visit Postojna weather in November.
In December, the weather is slightly milder than in January, with average temperatures ranging from a minimum of -13°C (9°F) to a maximum of 13°C (56°F), compared to January's -14°C (7°F) to 11°C (52°F). While both months experience high humidity levels at 88%, December sees significantly more precipitation at 161 mm (6.3 in) over 11 days, versus January's 72 mm (2.8 in) over 8 days. For a more detailed look at the December climate, you can visit Postojna weather in December.
As winter reigns in Postojna during January, the weather stands out with its chilly temperatures and significant humidity. Unlike the milder months, where warmth prevails, January brings an exhilarating crispness, with contrasts between daytime highs and night-time lows that can drop into the depths of winter. Expect not just a picturesque landscape but also increased precipitation, generally taking the form of light snow or rain on several days. This month is characterized by an atmosphere that's refreshingly cold yet picturesquely serene, making it a unique time to experience the magic of Postojna. For those interested in a deeper dive into what each month has to offer, check out the details at Postojna Climate.