Last updated: August 27, 2025
January in Portorož, Slovenia, showcases a chilly coastal climate, with temperatures fluctuating between a minimum of -3°C (27°F) and a maximum of 13°C (56°F), averaging around 7°C (46°F). This month is characterized by high humidity levels of 88%, making the air feel cooler than it is. Visitors can expect 58 mm (2.3 in) of precipitation across approximately 7 days, adding a touch of wintery charm to this picturesque town. Whether you're braving the brisk air or enjoying cozy indoor activities, January presents a unique experience for those exploring Portorož.
In January, Portorož experiences a chilly start to the year, with temperatures ranging from a brisk -3°C (27°F) at night to a mild 13°C (56°F) during the day, leading to an average of 7°C (46°F). This month marks a transition into slightly warmer weather, as observed in February, where the average creeps up to 8°C (47°F), maintaining a similar range in lows and highs. As spring approaches in March, temperatures further increase, showcasing a notable rise with average highs of 16°C (62°F) and lows remaining steady. These gradual shifts signal the end of winter's grip, hinting at the more pleasant and warmer months ahead in Portorož.
January in Portorož, Slovenia, marks the beginning of the year with a moderate precipitation of 58 mm (2.3 in) spread over an average of 7 days. This sets the tone for the wetter months ahead, as precipitation levels climb significantly in February, reaching 106 mm (4.2 in), showing a clear trend of increasing rainfall with the approach of spring. Notably, January’s precipitation is on par with March, but both months serve as a precursor to the heavier rains that dominate the latter part of the year, particularly in September and November, where totals soar to 171 mm (6.7 in) and 183 mm (7.2 in) respectively. As winter transitions into spring, these patterns highlight Portorož’s climate oscillation, with early months receiving less moisture before the dramatic spikes usher in the lush landscapes synonymous with the region’s late-year glow.
In January, Portoroz, Slovenia, experiences a notably high humidity level of 88%, setting the stage for a winter atmosphere that often feels lush and damp. As the months progress, humidity begins to decrease steadily, dipping to 82% in February, before dropping to a more moderate 73% in both March and April. This trend of declining moisture continues into late spring and summer, with humidity reaching its lowest point of 51% in August, perfect for enjoying the Adriatic coast. However, this dry spell is short-lived, as humidity creeps back up to 64% by September, and further rises to 83% in October—a harbinger of the approaching winter months. November and December reclaim the high humidity levels, closing the year at 89% and 88%, respectively, reminding us that while summer brings relief, winter in Portoroz is certainly characterized by a rich, velvety atmosphere.
In January, Portorož, Slovenia, experiences a UV Index of 2, categorized as low, with a burn time of about 45 minutes. This makes it a relatively safe month for outdoor activities, as strong sun exposure is minimal. However, as the year progresses, the UV Index begins to rise, notably peaking in June and July at 9, which falls under the very high exposure category, allowing for only 15 minutes before skin damage can occur. This upward trend continues into August with a UV Index of 8. As autumn approaches, the index gradually decreases, returning to a low level of 2 in December. This seasonal fluctuation highlights the importance of adjusting sun protection strategies throughout the year. For more detailed information, you can visit Portoroz UV Index.
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In Portoroz, Slovenia, the sun begins to shine with promise in January, delivering 182 hours of bright light. As winter transitions into spring, the sunshine hours steadily climb, peaking in April with 344 hours, a clear indication of nature's awakening. This upward trend continues into the summer months, with June and July basking in 417 and 430 hours of sunlight, respectively, offering perfect conditions for beachgoers and outdoor enthusiasts. However, as autumn arrives, a gentle decline follows, with sunshine hours tapering off to 326 in September and further diminishing through the end of the year. This rhythmic pattern not only highlights the beauty of seasonal change but also makes Portoroz a delightful destination to enjoy both winter's quiet charm and the exuberant glow of summer.
In Portorož, Slovenia, January brings a modest 31% chance of sunny weather, making it one of the less likely months for sunshine. This trend of limited sunshine continues into February, where the likelihood rises to 42%, hinting at the gradual shift towards brighter days as winter wanes. As spring approaches, March showcases a significant leap to 65%, heralding a more sun-drenched atmosphere. Interestingly, while April and May exhibit a decrease in sunny days with 46% and 43% chances respectively, the summer months from June to August see a resurgence, peaking at 62% in August. This gradual transition from winter's gloom to summer's vibrancy clearly illustrates the changing weather patterns, with January feeling distinctly gray compared to the sun-soaked days that lie ahead.
In Portorož, Slovenia, the daylight duration in January offers a modest 9 hours of sunlight, hinting at the gradual progression from the longer nights of winter towards the brighter days of spring. As the month transitions into February, daylight increases to 10 hours, signaling the slow awakening of nature. This upward trend continues through March, reaching 11 hours, and blossoms into April with 13 hours of daylight. May and June are the peak months, where the sun generously shines for 14 and 15 hours respectively, inviting locals and visitors alike to celebrate the vibrant coastal atmosphere. However, as summer wanes in July and August, daylight begins to taper, dropping back to 14 and ultimately 12 hours by September. The cycle continues, with October and November seeing a decrease to 10 and 9 hours of daylight, before winter descends in December, culminating in just 8 hours of sunlight. This rhythmic dance of daylight not only marks the changing seasons but also enriches the experience of life along the picturesque Slovenian coast.
In Portorož, January brings a refreshing average wind speed of 4.3 m/s (10 mph), setting the stage for a vibrant winter atmosphere. As the year unfolds, wind patterns reveal a slight upward trend in the spring months, peaking at 4.5 m/s (10 mph) in May, perfect for outdoor activities along the gorgeous coastline. However, a gentle decline is noted as summer rolls in, with wind speeds dropping to around 3.1 m/s (7 mph) in June, before experiencing a modest recovery in the fall months. Notably, October showcases the year’s highest gusts at 5.0 m/s (11 mph), with November closely following, creating a dynamic backdrop for both locals and visitors. As winter resumes, the winds calm again, reminding us of the cyclical nature of Portorož's climate.
Weather in Portoroz varies notably across the year, with each month offering distinct climate conditions. This page compares January’s weather to other months in Portoroz, focusing on differences in temperature, rainfall, humidity, and UV levels.
January and February exhibit similar temperature ranges, with both months experiencing a minimum of -3°C (27°F) and maximum temperatures peaking at 13°C (56°F). However, February tends to be slightly warmer on average, with an average temperature of 8°C (47°F) compared to January's 7°C (46°F). In terms of precipitation, February is notably wetter, accumulating 106 mm (4.2 in) over 11 days, while January sees only 58 mm (2.3 in) over 7 days. The humidity levels are also different, with January experiencing higher humidity at 88%, while February has a slightly lower level at 82%. For a detailed look at February's weather, you can visit Portoroz weather in February.
Comparing the weather between January and March reveals a noticeable shift as spring approaches. In January, temperatures range from a chilly minimum of -3°C (27°F) to an average of 7°C (46°F), peaking at a milder 13°C (56°F). The month sees approximately 58 mm (2.3 in) of precipitation spread over about 7 days, accompanied by high humidity levels reaching 88%. In contrast, March brings slightly warmer conditions, with minimum temperatures still at -3°C (27°F), but an increase in the average to 10°C (50°F) and a maximum of 16°C (62°F). Precipitation remains similar at 57 mm (2.3 in) over 7 days, yet humidity drops to a more comfortable 73%. This transition highlights the beginning of spring's influence, making March a more pleasant month overall. For more details, you can check Portoroz weather in March.
January and April present quite a contrast in weather conditions. In January, temperatures range from a chilly -3°C (27°F) at night to a mild 13°C (56°F) during the day, with an average temperature of 7°C (46°F). The month experiences notable precipitation, totaling 58 mm (2.3 in) over about 7 days, accompanied by high humidity at 88%. In contrast, April sees a warming trend, with minimum temperatures of 5°C (42°F) and maximums reaching 20°C (68°F), resulting in an average of 13°C (56°F). Precipitation also increases slightly to 86 mm (3.4 in) over 8 days, but humidity drops to a more comfortable 73%. This change in climate marks a significant transition from the cold depths of winter to the pleasant onset of spring. For more detailed information, check Portoroz weather in April.
In January, the weather is quite chilly, with temperatures ranging from a chilly -3°C (27°F) at night to a mild 13°C (56°F) during the day, accompanied by high humidity at 88%. This month typically sees around 58 mm (2.3 in) of precipitation over seven days, making it one of the cooler and wetter times of the year. In stark contrast, May ushers in a much warmer climate, with temperatures rising from a comfortable 10°C (50°F) at night to a pleasant 24°C (76°F) during the day. While May also experiences precipitation, totaling 105 mm (4.2 in) over 13 days, the humidity is significantly lower at 70%. For more details about the weather in May, check out Portoroz weather in May.
In January, the weather is significantly colder, with temperatures ranging from a chilly min of -3°C (27°F) to an average of 7°C (46°F), peaking at 13°C (56°F). The month experiences higher humidity at 88% and about 58 mm (2.3 inches) of precipitation over 7 days. In contrast, June brings much warmer conditions, with temperatures soaring from a minimum of 16°C (61°F) to an average of 23°C (73°F), and reaching a maximum of 30°C (86°F). The humidity decreases to 69%, and while precipitation rises slightly to 68 mm (2.7 inches), it falls over only 5 days. For more details on what to expect, check out Portoroz weather in June.
In January, the weather is notably chilly, with temperatures ranging from a minimum of -3°C (27°F) to a maximum of 13°C (56°F) and an average of 7°C (46°F). With 58 mm (2.3 in) of precipitation spread over about 7 days, humidity levels are quite high at 88%. In contrast, July brings a warm and pleasant atmosphere, with temperatures ranging from a minimum of 20°C (68°F) to a maximum of 29°C (85°F), averaging around 25°C (77°F). The precipitation decreases to 49 mm (1.9 in) over just 6 days, and humidity levels drop to a more comfortable 63%. For more detailed information, you can check Portoroz weather in July.
In January, the weather is characterized by cold temperatures, with minimums dropping to -3°C (27°F) and average highs reaching only 13°C (56°F). The high humidity at 88% adds to the chill, and precipitation occurs over approximately seven days, totaling 58 mm (2.3 in). In stark contrast, August brings warm and pleasant conditions, featuring minimum temperatures of 17°C (63°F) and average highs soaring to 30°C (87°F). The humidity is much lower at 51%, and while August also sees 58 mm (2.3 in) of precipitation, it occurs over just six days. For a closer look at August weather, you can visit Portoroz weather in August.
In January, the weather tends to be quite chilly, with temperatures ranging from a minimum of -3°C (27°F) to a maximum of 13°C (56°F). This month experiences an average temperature of 7°C (46°F) and is characterized by high humidity at 88%, along with about 58 mm (2.3 in) of precipitation spread over 7 days. In stark contrast, September offers much warmer conditions, with minimum temperatures of 14°C (57°F) and maximums reaching 28°C (82°F). The average temperature in September is a comfortable 22°C (71°F), though it sees more rainfall, totaling around 171 mm (6.7 in) over approximately 10 days, with a lower humidity of 64%. For more detailed insights on weather specifics, check Portoroz weather in September.
In January, temperatures can drop to a chilly minimum of -3°C (27°F), with average highs reaching only 13°C (56°F), while the month experiences significant humidity at 88%. Precipitation is moderate, totaling 58 mm (2.3 in) over about 7 days. In contrast, October brings milder conditions, with minimum temperatures around 11°C (52°F) and average highs of 23°C (73°F). The month sees increased rainfall, with 100 mm (4.0 in) spread across roughly 10 days, but humidity remains slightly lower at 83%. For more detailed insights on weather specifics, check out Portoroz weather in October.
In January, the weather is considerably cooler, with temperatures ranging from a minimum of -3°C (27°F) to a maximum of 13°C (56°F) and an average of 7°C (46°F). This month typically sees about 58 mm (2.3 in) of precipitation over around 7 days, resulting in a high level of humidity at 88%.
In contrast, November experiences milder temperatures, with a minimum of 6°C (42°F), an average of 13°C (56°F), and a maximum of 19°C (67°F). However, it is also wetter, with precipitation totaling 183 mm (7.2 in) over approximately 13 days, and humidity remains slightly higher at 89%. For a detailed look at what to expect during this month, check out Portoroz weather in November.
In January, the weather is typically colder than in December, with average temperatures ranging from a minimum of -3°C (27°F) to a maximum of 13°C (56°F), compared to December's milder range of 4°C (39°F) to 16°C (60°F). While January experiences about half the precipitation of December, receiving 58 mm (2.3 in) over 7 days, December sees significantly higher rainfall of 150 mm (5.9 in) over 13 days. Despite the differences in temperature and precipitation, both months maintain a consistent humidity level of 88%, creating a damp feel throughout. For more details, you can check Portoroz weather in December.
January in Portorož ushers in a colder atmosphere, distinct from the milder months that precede and follow it. With average temperatures dipping to a brisk 7°C and frequent cool spells, this month embraces winter's chill—often a stark contrast to the warmer summer temperatures. Amidst the increased humidity levels, expect about a week of precipitation, which adds to the atmospheric character of this coastal town. As you navigate the winter landscape, pristine views of the Adriatic remain captivating, making January a unique time to appreciate Portorož's serene beauty. For more details on the climate year-round, visit Portoroz Climate.