Last updated: August 27, 2025
In August, Koper, Slovenia experiences pleasantly warm weather, with maximum temperatures reaching 34°C (94°F) and an average of 25°C (77°F). The region enjoys a comfortable environment, as minimum temperatures seldom drop below 15°C (59°F). While the month brings a moderate precipitation amount of 70 mm (2.7 in) over approximately 7 days, the overall humidity remains at a balanced 51%, contributing to a refreshing summer ambiance. Visitors can appreciate the vibrant atmosphere amid occasional summer showers, making it an ideal time to explore this charming coastal city.
In August, Koper experiences the warm embrace of summer, with temperatures that reach their peak for the year. The minimum temperatures settle comfortably at around 15°C (59°F), while average daytime highs soar to 25°C (77°F). The heat intensifies, culminating in maximum temperatures that can hit a sizzling 34°C (94°F), making it ideal for sun-seekers and beachgoers alike. As a contrast to the cooler months preceding it, August represents a vibrant shift, where the warmth invites long outdoor activities and leisurely evenings by the Adriatic coast. As summer wanes, the transition to September offers a gradual cooling, but in August, Koper feels alive with the warmth of the season.
In August, Koper, Slovenia, experiences a moderate precipitation level of 70 mm (2.7 in) over approximately 7 days of rainfall. This marks a slight increase from the drier spells of July, where only 65 mm fell, yet remains considerably lower than the upcoming months. As summer wanes, the trend suggests a gradual rise in precipitation, leading into the wetter months of September and November. Notably, while August maintains a balance between sunny days and occasional showers, it serves as a precursor to the notable spike in precipitation that characterizes the fall season in Koper.
In Koper, Slovenia, August marks a noticeable shift in humidity levels, dropping to a comfortable 51%. This substantial decrease follows a gradual decline throughout the summer months, where humidity levels steadily fell from 63% in July. This trend highlights August as a particularly dry month, offering respite from the typically higher humidity that characterizes the beginning of the year, with levels peaking at 88% in January and remaining elevated in the subsequent months. As summer transitions into fall, the humidity starts to rise again, reaching 64% in September and climbing back to 83% in October. This cyclical pattern underscores Koper's diverse climate, making August a delightful time for those seeking milder, less humid weather.
In August, Koper, Slovenia experiences a UV Index of 8, signaling a very high exposure category that requires careful sun safety precautions, as the burn time is just 15 minutes. This trend of elevated UV levels continues from the peak reached in June and July, both maintaining a UV Index of 9. As summer transitions into autumn, the UV Index begins to decline, dropping to 7 in September. Overall, from May onward, Koper's UV Index consistently indicates the need for sun protection, reminding residents and visitors alike to stay vigilant about their skin health. For more detailed information, you can check the Koper UV Index.
UV Risk Categories
In Koper, Slovenia, the sun shines brightly throughout the summer, peaking in July with an impressive 430 hours of sunlight. This month serves as the zenith of the sun-soaked season, followed closely by June and August, which also provide generous hours of bright skies. As the warmth of summer wanes, there’s a noticeable decline in sunshine hours, with August offering 397 hours before transitioning into the cooler months. The trend highlights a gradual descent into autumn, where daylight diminishes to 326 hours in September, and further to 293 hours by October. This seasonal ebb in sunshine encapsulates the beauty of Koper's Mediterranean climate, inviting visitors to bask in the vibrant summer glow before the serene autumn sets in.
In Koper, Slovenia, the likelihood of sunny weather reaches its peak in August, with an impressive 61% chance of sun. This trend reflects a significant rise from earlier months; while January starts the year with just 32%, the sunshine percentage gradually increases, showcasing the approach of summer. March marks a notable transition with 63% sunny days, but the subsequent months, while still pleasant, display slight fluctuations. As summer progresses, the chances remain favorable, with July at 51% before August takes the crown. As autumn approaches in September, the probability of sun dips slightly to 59%, yet still highlights Koper's reputation for enjoyable weather later into the summer season.
In Koper, Slovenia, August is a vibrant month bathed in 14 hours of daylight, a slight dip from the summer peak in June and July, which both enjoy 15 hours. This gradual decrease signals the transition towards autumn, as the lush days of summer begin to wane. Notably, the month still offers ample sunlight, allowing for delightful evenings and outdoor activities amidst the lingering warmth. As daylight hours gradually taper off from this point, Koper transitions into the softer light of fall, with September bringing in 12 hours of daylight and a marked change in atmosphere. The shift in daylight duration throughout the year highlights the rhythm of nature, inviting residents and visitors alike to savor the remaining summer warmth before the cooler months approach.
In Koper, Slovenia, the average wind speed in August registers at a gentle 2.8 m/s (6 mph), a notable dip from the peak winds typically experienced in October and November. Throughout the summer months, wind speeds maintain a relatively mild range, with July slightly breezier at 2.5 m/s (6 mph). In contrast, the spring months show a gradual increase leading into summer, with April and May both reaching up to 3.2 m/s (7 mph). This pattern underscores a tendency for the coast to experience lighter winds during the height of summer, making August a calm interlude before the stronger autumn breezes begin to roll in. The overall trend reveals Koper's coastal climate as one that cradles soft summer breezes, perfect for leisurely outdoor activities.
Weather in Koper varies notably across the year, with each month offering distinct climate conditions. This page compares August’s weather to other months in Koper, focusing on differences in temperature, rainfall, humidity, and UV levels.
August and January showcase strikingly different weather patterns. In August, temperatures typically range from a mild 15°C (59°F) at night to a warm average of 25°C (77°F), peaking at a hot 34°C (94°F). The month sees about 70 mm (2.7 in) of precipitation over approximately 7 days, coupled with a moderate humidity level of 51%. Conversely, January experiences a stark contrast, with temperatures dropping to a minimum of -7°C (20°F), averaging just 5°C (41°F), and reaching a maximum of 13°C (56°F). While precipitation is slightly lower at 56 mm (2.2 in) over the same number of days, the humidity is significantly higher at 88%. For more detailed insights, you can check Koper weather in January.
In August, the weather is warm and typically pleasant, 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). With an average humidity of 51% and only about 70 mm (2.7 in) of precipitation over 7 days, August is generally dry and comfortable for outdoor activities.
In contrast, February presents a much cooler climate. The temperature ranges from a chilly minimum of -6°C (22°F) to a maximum of 19°C (67°F), with an average of only 7°C (44°F). This month is wetter, experiencing about 118 mm (4.6 in) of precipitation over 10 days, coupled with higher humidity levels at 82%, making it feel quite damp. For more insights about February weather, check out Koper weather in February.
In comparing the weather between August and March, notable differences emerge. August enjoys warmer temperatures, with minimums around 15°C (59°F) and averages reaching 25°C (77°F), peaking at 34°C (94°F). In contrast, March experiences a much cooler climate, with minimum temperatures dropping to -7°C (20°F) and an average of only 9°C (48°F), though it can reach a maximum of 21°C (70°F). Both months see similar levels of precipitation, with August recording 70 mm (2.7 in) over 7 days and March slightly higher at 71 mm (2.8 in) over 8 days. Humidity levels also vary, with August at 51% compared to March's higher humidity of 73%. For a detailed outlook on the weather during March, you can check Koper weather in March.
In comparing the weather between August and April, August typically offers warmer temperatures, with minimums around 15°C (59°F) and average highs reaching up to 34°C (94°F), while April is cooler, with temperatures ranging from a minimum of 1°C (34°F) to a maximum of 25°C (77°F). Precipitation levels also vary, as April tends to be wetter with 103 mm (4.0 in) of rain over 10 days compared to August's 70 mm (2.7 in) spread across 7 days. Furthermore, April's higher humidity at 73% contrasts with the more comfortable 51% humidity experienced in August. For a detailed overview of April weather, you can visit Koper weather in April.
In comparing the weather of August and May, August typically enjoys warmer temperatures, with an average of 25°C (77°F) and maximum highs reaching 34°C (94°F). In contrast, May's temperatures are noticeably cooler, with an average of 17°C (63°F) and highs up to 27°C (81°F). Humidity levels in August are more moderate at 51%, while May experiences a higher humidity level of 70%, contributing to a more humid feel. Precipitation is also more frequent in May, with 142 mm (5.6 in) over 17 days compared to just 70 mm (2.7 in) over 7 days in August. For a detailed view of Koper's weather in May, you can visit Koper weather in May.
When comparing the weather in June and August, there are notable differences in temperature and humidity. June temperatures range from a minimum of 11°C (53°F) to a maximum of 33°C (92°F), with an average of 22°C (72°F) and 69% humidity, contributing to a generally mild and somewhat humid atmosphere. In contrast, August experiences warmer temperatures, with a minimum of 15°C (59°F) and a maximum of 34°C (94°F), averaging 25°C (77°F) while maintaining lower humidity at 51%. Additionally, June tends to have more precipitation, with 87 mm (3.4 in) over 8 days, compared to August's 70 mm (2.7 in) over just 7 days. For more detailed weather insights, you can check Koper weather in June.
In comparing the weather between July and August, August tends to be slightly warmer with an average temperature of 25°C (77°F) compared to July's 24°C (75°F). August also experiences a maximum temperature of 34°C (94°F), just a degree higher than July's maximum of 33°C (91°F). Precipitation is relatively consistent, with August recording 70 mm (2.7 in) over 7 days, while July had 65 mm (2.6 in) across 8 days. Additionally, August has a lower humidity level at 51%, compared to July's higher humidity at 63%. For more detailed information about July's weather, you can check Koper weather in July.
August typically features warmer temperatures, with a minimum of 15°C (59°F) and an average of 25°C (77°F), peaking at a high of 34°C (94°F). The month sees moderate precipitation of 70 mm (2.7 in) over about 7 days, along with relatively low humidity at 51%. In contrast, September brings cooler weather, with a minimum temperature of 9°C (49°F) and an average of 20°C (68°F), reaching a maximum of 32°C (90°F). However, this month experiences significantly higher precipitation, totaling 164 mm (6.4 in) over approximately 10 days, and increased humidity at 64%. For more details on what to expect, check out Koper weather in September.
In comparing the weather of August and October, it's evident that August typically enjoys warmer temperatures, with averages around 25°C (77°F) and maximums reaching up to 34°C (94°F). In contrast, October sees a marked drop in temperature, averaging just 15°C (59°F) and peaking at 23°C (74°F). Additionally, October experiences higher humidity levels at 83%, compared to August's more moderate 51%. Precipitation also increases, with October recording 107 mm (4.2 in) over 10 days, while August has only 70 mm (2.7 in) across 7 days. For more detailed insights, check the Koper weather in October.
In August, the weather is warm and relatively dry, with temperatures ranging from a minimum of 15°C (59°F) to a maximum of 34°C (94°F) and an average of 25°C (77°F). The month experiences about 70 mm (2.7 in) of precipitation over approximately 7 days, accompanied by a moderate humidity level of 51%. In contrast, November brings a notable drop in temperature, with min temperatures at 1°C (34°F), an average of 11°C (52°F), and a max of 20°C (68°F). This month is much wetter, recording 176 mm (6.9 in) of precipitation across 12 days, and the humidity rises significantly to 89%. For more details on the November weather, check out Koper weather in November.
In August, temperatures in Koper are warm and pleasant, with an average of 25°C (77°F) and highs reaching up to 34°C (94°F). The weather is relatively humid, with 51% humidity and about 70 mm (2.7 in) of precipitation over approximately 7 days. In contrast, December brings a stark change, with temperatures dropping significantly; the average is only 7°C (44°F), and highs reach up to 15°C (60°F). This month experiences higher precipitation levels of 150 mm (5.9 in) over about 12 days, coupled with much greater humidity at 88%. For a more detailed look at the December conditions, check out Koper weather in December.
August in Koper is characterized by warm temperatures and a comfortable average, making it a delightful transition from the peak summer heat. With maximum highs often reaching the low 30s Celsius, this month stands out for its sunny days and only modest rainfall, typically spread across a few days. The humidity level remains manageable, contributing to a pleasant climate for outdoor activities. In contrast to the cooler and wetter months that precede it, August invites visitors to enjoy the vibrant coastal life that Koper has to offer. For more detailed information about the weather patterns, visit Koper Climate.