Last updated: August 27, 2025
In September, Izola, Slovenia, experiences a delightful transition from summer to autumn, showcasing an impressive maximum temperature of 32°C (90°F) and a pleasant average of 20°C (68°F). While temperatures can dip to a minimum of 9°C (49°F), the month remains relatively mild. With precipitation totaling 164 mm (6.4 in) over about 10 days, the atmosphere retains a comfortable humidity level of 64%, making it an ideal time for visitors to enjoy the town's unique blend of coastal charm and natural beauty.
As summer gracefully transitions into autumn, September in Izola, Slovenia, brings a delightful mix of warm days and cooler nights. With average temperatures peaking at 20°C (68°F) and highs reaching up to 32°C (90°F), it's a time when the lingering warmth of summer still embraces the Adriatic coast. The nights begin to cool down, dropping to a refreshing 9°C (49°F), signaling the upcoming change of seasons. This month exemplifies a pleasant balance, where outdoor activities remain enjoyable and the picturesque landscapes begin to take on their autumn hues, making it an ideal time for visitors to soak in the beauty of Izola before the chill of fall settles in.
In September, Izola, Slovenia, experiences a notable surge in precipitation, with a striking 164 mm (6.4 in) of rainfall falling across 10 days. This uptick marks a significant increase from the preceding months, reflecting the transition towards the wetter autumn season. While July and August typically see more subdued, summer-like patterns with mere 65 mm and 70 mm of rain, September's figures demonstrate a shift as temperatures cool and the atmosphere gains more moisture. This trend continues into autumn, with October and November also showcasing substantial rainfall, hinting at the region’s characteristic climate variability. With September setting the stage for the rainier months ahead, locals and visitors alike should prepare for the lush, vibrant landscapes that the increased rainfall fosters.
In September, Izola experiences a noticeable transition in humidity levels, settling at a comfortable 64%—a slight uptick from the summer's low of 51% in August. This change marks a shift from the dry warmth of the peak summer months, as the region begins to prepare for the cooling influences of autumn. Following the trend of decreasing humidity from January through August, September's readings signify a gradual return to the higher humidity levels typical of the earlier months in the year, reminiscent of January's 88%. As the season shifts, residents and visitors alike can enjoy a refreshing balance, making September a delightful time to experience Izola's scenic beauty.
As summer gracefully transitions into autumn, September in Izola, Slovenia experiences a notable decrease in the UV Index, which stands at 7, categorized as high. This drop from the intense levels of July and August, both hitting a UV Index of 9, signals a shift toward more moderate sun exposure. While sun-seekers still enjoy ample sunshine with a burn time of just 25 minutes, it's wise to take precautions and seek shade during peak hours. The changing UV levels throughout the year reveal a clear trend: as temperatures cool and daylight shortens, the risk of overexposure diminishes. For a comprehensive understanding of UV levels, check out the detailed guide at Izola UV Index.
UV Risk Categories
September in Izola, Slovenia, is a splendid blend of warmth and tranquility, boasting an impressive 326 hours of sunshine that perfectly encapsulates the late-summer charm. As the holiday crowds begin to thin, visitors can revel in the gentle glow of sunshine, a welcome continuation from the vibrant summer months. Although sunlight begins to wane compared to the peak of summer—July's 430 hours and August's 397 hours—September still offers a brilliant escape, standing as a beacon of brightness before the cooler days of autumn set in. With a gradual retreat from the peak sunshine of July and August, this month presents an ideal time for leisurely strolls along the Adriatic coast, basking in pleasant weather and the lingering summer vibes.
In September, Izola, Slovenia enjoys a 59% chance of sunny weather, marking a delightful transition from the bustling summer months. Following a peak in August at 61%, the slight dip in September still offers plenty of sun-soaked days, keeping the warmth alive as autumn approaches. Compared to earlier in the year, where the likelihood of sunshine fluctuated – starting at a mere 32% in January and capturing a high of 63% in March – September stands out as one of the more promising months for sun. With the summer vibe lingering, it’s an ideal time to explore this picturesque coastal town, making the most of the beautiful Mediterranean climate before the cooler months set in.
As summer fades into autumn in Izola, Slovenia, September brings a gentle transition in daylight, with the sun gracing the skies for about 12 hours each day. This marks a noticeable decrease from the sun-soaked days of July and August, where daylight peaked at 15 hours. However, September's daylight still outshines the winter months, as it stands above October's expected 10 hours and the wintery depths of November with just 9 hours. The gradual shift from longer summer days to shorter autumn nights reflects nature's rhythm, inviting residents and visitors alike to savor the last warm days before the colder months set in.
In September, Izola experiences a gentle respite as the summer winds begin to wane, with an average wind speed of 2.4 m/s (5 mph). This marks a noticeable decrease from the slightly breezier months of May and April, which see speeds of 3.2 m/s (7 mph) and 3.0 m/s (7 mph) respectively. As autumn approaches, the coastal breeze starts to mellow, creating a serene atmosphere perfect for leisurely strolls by the seaside. Notably, this trend of decreasing wind speeds through the latter summer months contrasts sharply with the invigorating gusts of the following autumn, where October and November pick up to 3.6 m/s (8 mph) and 3.7 m/s (8 mph). Thus, September in Izola embodies a transitional phase, where the remnants of summer softly give way to the crisper autumnal air.
Weather in Izola varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in Izola, focusing on differences in temperature, rainfall, humidity, and UV levels.
In September, the weather is characterized by a warm climate with temperatures ranging from a minimum of 9°C (49°F) to a maximum of 32°C (90°F), and an average of 20°C (68°F). This month sees precipitation levels around 164 mm (6.4 in) over approximately 10 days, coupled with a moderate humidity of 64%. In contrast, January brings significantly colder temperatures, with lows dropping to -7°C (20°F) and highs peaking at just 13°C (56°F), averaging a chilly 5°C (41°F). Additionally, January experiences less rainfall, totaling 56 mm (2.2 in) over 7 days, but the humidity is noticeably higher at 88%. For more details on January weather, check out Izola weather in January.
When comparing the weather in September and February, there is a stark contrast in temperatures and conditions. September enjoys mild to warm temperatures, with a minimum of 9°C (49°F), an average of 20°C (68°F), and a maximum of 32°C (90°F), making it a pleasant time for outdoor activities. In contrast, February experiences much colder conditions, with temperatures dropping to a minimum of -6°C (22°F) and an average of just 7°C (44°F); the maximum reaches only 19°C (67°F). While both months see precipitation on about 10 days, September receives more rainfall at 164 mm (6.4 in), compared to February's 118 mm (4.6 in). Additionally, February has a higher humidity level at 82%, compared to September’s 64%. For a detailed look at February weather, you can check Izola weather in February.
September and March present contrasting weather conditions. In September, the temperatures are generally warmer, with a minimum of 9°C (49°F) and an average high of 32°C (90°F), creating a more pleasant atmosphere for outdoor activities. This month also experiences significant rainfall, averaging 164 mm (6.4 in) over about 10 days, alongside a humidity level of 64%. In contrast, March is much cooler, with a minimum temperature plummeting to -7°C (20°F) and an average high of 21°C (70°F). Precipitation is lighter in March, totaling 71 mm (2.8 in) over 8 days, and the humidity is slightly higher at 73%. For a detailed look at what to expect in March, you can check Izola weather in March.
In comparing the weather between September and April, September tends to be warmer overall, featuring a minimum temperature of 9°C (49°F), an average of 20°C (68°F), and a maximum of 32°C (90°F). In contrast, April is cooler, with temperatures ranging from a minimum of 1°C (34°F) to a maximum of 25°C (77°F), resulting in an average of 13°C (55°F). Both months experience precipitation over approximately 10 days; however, September sees a significantly higher total of 164 mm (6.4 in) compared to April's 103 mm (4.0 in). Additionally, September has a slightly lower humidity level at 64%, while April has a higher humidity at 73%. For a more detailed look at the weather in April, you can visit Izola weather in April.
September and May present distinct weather patterns. In September, temperatures range from a minimum of 9°C (49°F) to a maximum of 32°C (90°F), with an average of around 20°C (68°F). This month experiences more sunshine, yet it also sees significant rainfall, totaling 164 mm (6.4 in) over about 10 days, accompanied by a humidity level of 64%. In contrast, May is generally cooler, with temperatures ranging from 7°C (46°F) to 27°C (81°F) and an average of 17°C (63°F). Although May receives slightly less precipitation at 142 mm (5.6 in), it experiences a higher number of rainy days, totaling 17, and exhibits a higher humidity level of 70%. For more details, check out Izola weather in May.
In comparing the weather of September and June, we notice that September tends to have a broader temperature range, with minimum temperatures around 9°C (49°F) and maximums reaching 32°C (90°F). In contrast, June features slightly warmer nights, with minimum temperatures at 11°C (53°F), and similar daytime highs at 33°C (92°F). Precipitation levels also differ; September experiences significantly more rainfall at 164 mm (6.4 in) over about 10 days, compared to June’s 87 mm (3.4 in) over 8 days. Humidity levels are fairly close, with September at 64% and June slightly higher at 69%. For a more detailed look at June’s weather, visit Izola weather in June.
When comparing the weather in September and July, September typically exhibits a broader temperature range, with minimums dipping to 9°C (49°F) and maximums reaching up to 32°C (90°F), while the average temperature settles at 20°C (68°F). In contrast, July has milder minimums starting at 16°C (61°F) and a slightly higher average temperature of 24°C (75°F), with maximums peaking at 33°C (91°F). Precipitation is significantly higher in September, totaling 164 mm (6.4 in) over 10 days, compared to July's 65 mm (2.6 in) over just 8 days. Both months maintain similar humidity levels, with September at 64% and July slightly lower at 63%. For a detailed look at July weather, you can visit Izola weather in July.
In comparing the weather of September to that of August, we see notable differences in temperature and precipitation. September experiences a broader temperature range, with minimums dropping to 9°C (49°F) and maximums reaching up to 32°C (90°F), averaging around 20°C (68°F). In contrast, August boasts warmer temperatures, featuring minimums of 15°C (59°F), maximums of 34°C (94°F), and an average of 25°C (77°F). Additionally, September is characterized by significantly higher precipitation, with 164 mm (6.4 in) occurring over 10 days, compared to August's 70 mm (2.7 in) over just 7 days. The humidity levels also differ, with September exhibiting a higher average of 64% compared to August’s 51%. For more specific details on August weather, you can check Izola weather in August.
September weather is typically warmer and more variable, with temperatures ranging from a low of 9°C (49°F) to a high of 32°C (90°F) and an average of 20°C (68°F). However, it also sees more rainfall, with a total of 164 mm (6.4 in) over about 10 days and a humidity level of 64%. In contrast, October brings cooler temperatures, with a minimum of 6°C (44°F) and a maximum of 23°C (74°F), averaging around 15°C (59°F). Although October has less precipitation, totaling 107 mm (4.2 in) over the same number of rainy days, the humidity increases to 83%, making the air feel a bit more damp. For more detailed information about the weather in this month, you can visit Izola weather in October.
September and November present contrasting weather patterns, with September offering a warmer climate marked by average temperatures reaching 20°C (68°F) and maximum highs of 32°C (90°F). The month sees approximately 164 mm (6.4 in) of precipitation over 10 days, with a moderate humidity level of 64%. In stark contrast, November experiences significantly cooler temperatures, with averages dropping to 11°C (52°F) and minimums dipping as low as 1°C (34°F). Precipitation increases slightly to 176 mm (6.9 in) across 12 days, combined with higher humidity levels at 89%. For a closer look at what to expect, you can visit Izola weather in November.
In September, the weather is notably warmer, with temperatures ranging from a minimum of 9°C (49°F) to a maximum of 32°C (90°F) and an average of 20°C (68°F). This month also experiences considerable rainfall, totaling 164 mm (6.4 in) over about 10 days, with a moderate humidity level of 64%. In contrast, December brings a significant drop in temperatures, with a minimum of -1°C (30°F) and a maximum of 15°C (60°F), averaging only 7°C (44°F). Although December sees slightly less precipitation at 150 mm (5.9 in) over 12 days, the humidity is notably higher at 88%. For more detailed insights about December weather in Izola, you can check Izola weather in December.
As summer gracefully transitions into autumn, September in Izola offers a unique blend of warmth and mildness. With warm maximum temperatures alongside a refreshing average, days remain pleasant but are balanced by cooler nights, setting it apart from the sweltering summer months. While September experiences a notable amount of precipitation, the rainfall is more sporadic, allowing for sunny intervals that invite exploration of the beautiful coastal landscapes. The humidity levels, though slightly higher, contribute to the fresh feel of the air, making it an ideal time for outdoor activities. For a deeper dive into what you can expect throughout the year, check out Izola Climate.