Last updated: August 27, 2025
In January, Koper, Slovenia experiences a notably chilly climate characterized by a maximum temperature of 13°C (56°F) and an average of 5°C (41°F). The month can dip down to a brisk -7°C (20°F), with high humidity levels averaging 88%. Rainfall is also common, with a total precipitation of 56 mm (2.2 in) over about 7 days, creating a damp atmosphere that enhances the wintery feel of this picturesque coastal town. As the new year unfolds, Koper offers a unique blend of cool temperatures and vibrant scenery, perfect for those seeking a winter getaway.
January in Koper, Slovenia, showcases a wintry charm with temperatures that hover between a chilly -7°C (20°F) at night to a pleasant 13°C (56°F) during the day. The average temperature settles around 5°C (41°F), providing a crisp backdrop for the new year. As the month progresses, the region begins to thaw, hinting at the milder days to come in February, where temperatures rise slightly. This transition illustrates a gradual warming trend, paving the way for the eventual spring bloom by April and May. January's cold, paired with lower sunlight hours, creates a serene winter landscape, inviting visitors to enjoy the quiet beauty of Koper before the vibrant colors of spring emerge.
In January, Koper, Slovenia, experiences an average precipitation of 56 mm (2.2 in) over approximately 7 days of rain, setting the stage for a season of fluctuating weather. As winter transitions into spring, February witnesses a significant jump, with rainfall nearly doubling to 118 mm (4.6 in) across 10 days. This trend of increasing precipitation continues in the following months, peaking in November with an impressive 176 mm (6.9 in) over 12 wet days. Tantalizingly, September also draws attention with 164 mm (6.4 in), suggesting a pattern of late-year storms. Overall, Koper's climate reveals a dynamic rainfall distribution, marked by relatively low January levels that pave the way for a gradual increase, emphasizing the Mediterranean's seasonal shifts.
In January, Koper, Slovenia experiences a noteworthy humidity level of 88%, setting a trend that continues into the winter months. As the year progresses, humidity gradually decreases, reaching its lowest point of 51% in August, marking a distinct shift towards drier conditions during the summer. However, as autumn approaches, humidity begins to rise again, with October and November showing increased levels of 83% and 89%, respectively. Despite the variability, January remains one of the most humid months, highlighting Koper's wet winter climate before transitioning to warmer, drier summer months.
In January, Koper experiences a relatively low UV Index of 2, indicating that sun exposure poses minimal risk, with a burn time of approximately 45 minutes. As the months progress into February and March, the index gradually rises to 3 and 5, respectively, reflecting a moderate exposure category that encourages more awareness as the days start to lengthen and the sun's intensity increases. By April, the UV Index escalates to a high level of 6, marking a noticeable shift as burn times shorten to 25 minutes. The peak intensity arrives in May and June, when the index reaches 8 and 9, categorized as very high, drastically reducing safe exposure times to 15 minutes. As summer transitions to fall, the UV Index begins to decline, with September's 7 offering a high exposure risk before tapering off again in October and November to moderate levels of 5 and 3. Finally, December returns to a low index of 2, mirroring January's conditions. This seasonal pattern highlights the dynamic nature of UV exposure in Koper, Slovenia, underscoring the importance of sun protection during the peak months. For more detailed information, visit Koper UV Index.
UV Risk Categories
In January, Koper, Slovenia enjoys 182 hours of sunshine, setting a gentle tone for the year ahead. As winter slowly gives way to spring, sunshine hours rise steadily, with February bringing an increase to 223 hours. The trend continues through the subsequent months, peaking in the summer; by July, Koper basks in a glorious 430 hours of sunlight. This vibrant energy gradually tapers off in the fall, with October seeing 293 hours before winter reclaims its place. Notably, despite a decrease during the colder months, Koper maintains a relatively bright disposition, hinting that even in chillier times, it holds a warm embrace of sunlight.
In Koper, Slovenia, the chances of enjoying sunny weather in January stand at 32%, making it one of the cloudier months of the year. As the seasons transition into February, this figure increases to 41%, signaling the gradual return of sunlight. The likelihood of clear skies continues to climb through the spring, peaking in March at 63%. Following this sunny trend, April and May see slight dips, yet they still boast respectable probabilities of around 40%. As the summer months roll in, the chances of sunshine remain steady, ranging from 51% in July to 61% in August, before tapering off in the fall. Overall, January is a modest start to the year in terms of sunshine, but the upward trajectory hints at brighter days ahead as winter gives way to spring.
In Koper, Slovenia, January ushers in a brisk 9 hours of daylight, a stark reminder of winter's grip. As the month unfolds, the days gradually lengthen, with February bringing an extra hour of light, reaching 10 hours. This trend continues into March, where daylight swells to 11 hours, hinting at the impending arrival of spring. By April, the sun shines for 13 hours, a clear sign of nature's awakening, and by May, the crescendo reaches 14 hours. The peak of summer in June and July sees an impressive 15 hours, providing ample time for outdoor adventures. However, by August, daylight begins to wane, settling at 14 hours, and the rhythm of the seasons shifts once more. As autumn approaches, September provides 12 hours before a gradual descent into shorter days—October returns to 10 hours, November dips to 9, and December wraps up the year with just 8 hours of daylight, closing the cycle of light as the days turn colder and darker once again.
In January, Koper, Slovenia welcomes a gentle breeze with an average wind speed of 3.0 m/s (7 mph), setting the tone for the winter months ahead. This moderate wind is reminiscent of the transitional nature of early spring, as February and March show a slight decline, dipping to 2.8 m/s and 2.6 m/s respectively. However, just as the seasons shift, April brings renewed vigor with wind speeds climbing back to 3.0 m/s, hinting at warmer days on the horizon. As the year progresses into the sunnier months, average winds typically range from 2.2 m/s in June to 3.6 m/s in October, creating a dynamic atmosphere. The trend of increasing wind speeds in late autumn, peaking in November, suggests a shift towards a more exhilarating feel as the year draws to a close. Overall, Koper's wind patterns reflect a vibrant seasonal rhythm, gently guiding the community through its climatic changes.
Weather in Koper varies notably across the year, with each month offering distinct climate conditions. This page compares January’s weather to other months in Koper, focusing on differences in temperature, rainfall, humidity, and UV levels.
In comparing the weather between January and February, January experiences slightly colder temperatures, with a minimum of -7°C (20°F) and an average of 5°C (41°F), while February brings a milder climate, with an average temperature of 7°C (44°F) and a maximum of 19°C (67°F). However, February sees a significant increase in precipitation, totaling 118 mm (4.6 in) over 10 days, compared to January’s 56 mm (2.2 in) across 7 days. Additionally, humidity drops slightly from 88% in January to 82% in February. For more detailed information, you can check Koper weather in February.
In January, the weather is notably colder, with average temperatures residing around 5°C (41°F) and lows dipping to -7°C (20°F). This month experiences approximately 56 mm (2.2 in) of precipitation over seven days, accompanied by high humidity levels at 88%. In contrast, March brings a gentle warmth, with average temperatures rising to 9°C (48°F) and maximums reaching up to 21°C (70°F). Although March sees slightly more precipitation at 71 mm (2.8 in) over eight days, the humidity decreases to a comfortable 73%. For more detailed insights, you can check Koper weather in March.
In January, the weather tends to be quite cold, with temperatures ranging from a minimum of -7°C (20°F) to a maximum of 13°C (56°F), resulting in an average temperature of 5°C (41°F). The month experiences considerable humidity at 88% and generally sees 56 mm (2.2 in) of precipitation over about 7 days. In contrast, April brings a significant increase in warmth, with temperatures varying from a minimum of 1°C (34°F) to a maximum of 25°C (77°F) and an average of 13°C (55°F). However, April is also wetter, receiving 103 mm (4.0 in) of rain over approximately 10 days and a decrease in humidity to 73%. For more detailed insights, you can visit Koper weather in April.
In January, the weather is markedly colder, with average temperatures ranging from a chilly -7°C (20°F) to a mild maximum of 13°C (56°F). The month experiences high humidity levels at 88%, along with 56 mm (2.2 in) of precipitation over about 7 days. In contrast, May brings a significant warming trend, with temperatures fluctuating between a minimum of 7°C (46°F) and a comfortable high of 27°C (81°F). Although May has higher precipitation at 142 mm (5.6 in) over 17 days, the humidity drops to a more comfortable 70%. For more detailed insights on the weather in May, you can check this link: Koper weather in May.
In January, the weather is significantly colder, with temperatures ranging from a frosty -7°C (20°F) at night to a mild 13°C (56°F) during the day, averaging around 5°C (41°F). The month experiences considerable humidity at 88% and sees precipitation on about 7 days, amounting to 56 mm (2.2 in). In contrast, June brings much warmer conditions, with temperatures ranging from a minimum of 11°C (53°F) to a maximum of 33°C (92°F), averaging 22°C (72°F). While June is slightly wetter, with precipitation totaling 87 mm (3.4 in) over 8 days, the humidity drops to a more comfortable 69%. For more details on Koper's June weather, visit Koper weather in June.
In January, the weather is characterized by cold temperatures, with a minimum of -7°C (20°F) and an average of just 5°C (41°F), while maxing out at 13°C (56°F). This month also experiences high humidity levels at 88% and sees about 56 mm (2.2 in) of precipitation over approximately 7 days. In contrast, July brings significantly warmer conditions, with temperatures ranging from a minimum of 16°C (61°F) to a maximum of 33°C (91°F), averaging around 24°C (75°F). The humidity drops to 63%, and precipitation increases slightly to 65 mm (2.6 in) over 8 days. For more details on the weather during this summer month, you can visit Koper weather in July.
In January, the weather is notably colder, with temperatures ranging from a minimum of -7°C (20°F) to a maximum of 13°C (56°F), and an average temperature around 5°C (41°F). This month also sees higher humidity levels at 88% and experiences about 56 mm (2.2 in) of precipitation over seven days. In contrast, August brings with it much warmer weather, with temperatures ranging from a minimum of 15°C (59°F) to a maximum of 34°C (94°F) and an average temperature of 25°C (77°F). The humidity drops significantly to 51%, and while precipitation increases slightly to 70 mm (2.7 in), it still occurs over a similar number of days. For more details, you can check out Koper weather in August.
January and September exhibit stark contrasts in weather conditions. January features chilly temperatures, with minima dropping to -7°C (20°F) and a damp atmosphere marked by high humidity levels at 88%. The average temperature hovers around 5°C (41°F), and precipitation is relatively light at 56 mm (2.2 in) over about seven days. In contrast, September boasts a much warmer climate, with minimum temperatures starting at 9°C (49°F) and soaring to a maximum of 32°C (90°F), yielding an average of 20°C (68°F). This month experiences significantly higher precipitation, totaling 164 mm (6.4 in) over ten days, but the humidity is notably lower at 64%. These differences highlight the transition from winter's chill to the warmth of late summer. For a detailed look at weather specifics in September, visit Koper weather in September.
January and October present a noticeable contrast in weather patterns. In January, temperatures range from a chilly minimum of -7°C (20°F) to a modest maximum of 13°C (56°F), with an average around 5°C (41°F). Precipitation is moderate, totaling 56 mm (2.2 in) over about 7 days, accompanied by high humidity levels at 88%. In stark contrast, October enjoys milder temperatures, with a minimum of 6°C (44°F) and a maximum reaching 23°C (74°F), averaging 15°C (59°F). The month sees increased rainfall, totaling 107 mm (4.2 in) over approximately 10 days, while humidity levels remain relatively low at 83%. For more detailed insights, you can check out Koper weather in October.
In comparing the weather between January and November, January typically experiences much colder temperatures, with a minimum of -7°C (20°F) and an average of 5°C (41°F), while November boasts a milder minimum temperature of 1°C (34°F) and an average of 11°C (52°F). Precipitation is also significantly higher in November, reaching 176 mm (6.9 in) over 12 days compared to January's 56 mm (2.2 in) over 7 days. Additionally, both months exhibit high humidity levels, with January at 88% and November slightly higher at 89%. For a detailed look at November's climate, visit Koper weather in November.
In comparing the weather between January and December, January tends to be colder with minimum temperatures dropping to -7°C (20°F) and an average of 5°C (41°F), while December experiences milder conditions, with temperatures ranging from a minimum of -1°C (30°F) to an average of 7°C (44°F). Notably, December is also much wetter, with a precipitation total of 150 mm (5.9 in) over 12 days, compared to January's 56 mm (2.2 in) spread over just 7 days. Despite both months having a humidity level of 88%, the increased precipitation in December contributes to a distinctly different atmosphere. For more detailed insights on December weather patterns, you can check Koper weather in December.
January in Koper brings a chilly embrace, with average temperatures dipping noticeably compared to the milder months of spring and summer. This period is marked by a higher frequency of rainy days, contributing to a humid atmosphere that makes the air feel colder than it truly is. While sunny spells are scarce, the cool temperatures contrast sharply with the warmth of other seasons, inviting visitors to experience a quieter, more introspective side of the region. For those considering a trip, understanding January's unique weather patterns is essential—explore more about the year-round conditions at Koper Climate.