Last updated: March 17, 2025
In September, Opatija, Croatia experiences a delightful transition from summer warmth to the cooler autumn season. With maximum temperatures reaching 29°C (85°F) and an average of 19°C (66°F), visitors can enjoy pleasant weather during their stay. However, the month is also marked by 234 mm (9.2 in) of precipitation over approximately 12 days, which adds a refreshing touch to the climate. The humidity, sitting at around 64%, further enhances the experience of this picturesque coastal town. Whether soaking up the sun or enjoying the vibrant autumnal landscape, Opatija in September offers a unique and enjoyable getaway.
As September rolls into Opatija, Croatia, the temperatures begin to show a delightful transition towards autumn. With minimums of 8°C (47°F) and average highs reaching 29°C (85°F), the month retains a warm and inviting atmosphere, making it ideal for lingering beach days and scenic strolls along the coast. The warm summer heat begins to mellow, offering a comfortable average of 19°C (66°F), which is perfect for exploring the lush landscapes and cultural gems of this charming town. As the month progresses, the balmy evenings and sunny days create a picturesque backdrop, encouraging visitors to savor the last whispers of summer before the cooler months arrive.
September marks a notable transition in Opatija, Croatia, with precipitation levels peaking at an impressive 234 mm (9.2 in), making it the wettest month of the year. This uptick in rainfall is accompanied by an increase in rainy days, totaling 12. In contrast to the drier summer months—where June, July, and August receive less than 100 mm of rain each—September's deluge sets the stage for a more dramatic shift in the region's climate as autumn approaches. Following the summer heat, these early autumn rains not only revitalize the lush landscapes but also signal the onset of wetter months, as the precipitation continues to rise in October and November. Overall, the trends highlight September as a pivotal month, bridging the summer's warmth and the winter's chill with a refreshing burst of rain.
As the summer fades, September in Opatija, Croatia, welcomes a slight increase in humidity, settling at 64%. This uptick follows the notably dry summer months, where humidity levels dipped to a comfortable 51% in August. The transition from the warmth of summer toward the cooler autumn is marked by this gradual rise, reflecting the region's shift in atmospheric conditions. Interestingly, September’s humidity is a gentle precursor to the more humid months ahead, as it prepares the way for October's 83% and the winter seasons, where humidity levels soar back to 88% by December. This rhythm of fluctuating humidity illustrates Opatija’s diverse climate, making it a fascinating destination for visitors seeking to experience the region's climatic transformations.
As September arrives in Opatija, Croatia, the UV Index begins to indicate high levels of solar exposure, registering at 7. This marks a slight decline from the peak intensity of the summer months, where values reached 9 in both June and July, categorizing those periods as very high and resulting in a burn time of just 15 minutes. In September, sunbathers can enjoy a more moderate 25-minute burn time while still being mindful of sun protection. The trend leading into autumn shows a gradual decrease in UV intensity, making this month ideal for outdoor activities without the extreme caution required in summer. For a detailed overview of UV levels throughout the year, visit Opatija UV Index.
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September in Opatija, Croatia, is a delightful transition from the sun-drenched peak of summer to the gentle embrace of autumn. With 331 hours of sunshine, the month offers a generous share of bright days, though it marks a dip from the sun-soaked 432 hours of July and 401 hours of August. This trend reflects a gradual cooling as the year progresses, with the sun culminating its summer dominance in the preceding months. As one of the last opportunities to bask in warm rays before the cooler October sets in with 302 hours, September invites visitors to enjoy its milder temperatures and vibrant coastal scenery, making it an ideal time for leisurely strolls along the Adriatic. The sunlight here is not just a measure of time; it’s a catalyst for unforgettable experiences in this picturesque seaside resort.
In September, the charming coastal town of Opatija, Croatia, enjoys a 57% chance of sunny weather, making it an appealing destination for travelers seeking pleasant days. As summer transitions to autumn, the likelihood of sunshine remains high, consistent with the preceding months of June and August, which boast 57% and 60% respectively. This trend suggests a gentle shift in weather patterns; while the warm and sunny days of summer linger, there's a hint of the cooler season approaching. With the sun shining more than half the time, visitors can relish in outdoor activities, breathtaking views, and the vibrant ambiance that Opatija offers in early fall. As the percentage of sunny days declines in the coming months, September stands out as a perfect time to soak up the last rays of summer before autumn takes hold.
As summer gives way to autumn in Opatija, Croatia, September witnesses a gentle decline in daylight duration, offering approximately 12 hours of sunshine each day. Following the peak brightness of the summer months, which boast up to 15 hours in June and July, this month marks a transition towards shorter days. August retains a rich 14 hours of daylight, but by September, the diminishing light hints at the upcoming changes of fall. This shift symbolizes nature's rhythm, with each month gracefully leading into the next, ultimately wrapping up the 9 hours of daylight found in January, as daylight hours start to shorten further into autumn and winter.
As September unfolds in Opatija, Croatia, the gentle caress of the wind reflects the transitional feel of early autumn. With an average wind speed of 2.6 m/s (6 mph), this month experiences a slight decrease compared to the summer's peak breezes, which hovered around 2.9 m/s in August. This modulation in wind patterns suggests a calming shift, as summer warmth gives way to the cooler embrace of fall, inviting visitors to enjoy the stunning coastal scenery without the intensity of hotter months. As the autumnal chill begins to set in, locals and travelers alike can expect refreshing gusts that enhance the magical charm of Opatija’s shoreline.
The weather in Opatija changes throughout the year, offering a unique experience in each season. Below is a month-by-month comparison of September's weather with other months, highlighting differences in temperature, precipitation, and other key factors. Click on each section to discover seasonal trends in Opatija and find detailed weather information for every month.
September weather is marked by a mild temperature range, with minimums around 8°C (47°F) and maximums reaching up to 29°C (85°F). In contrast, January experiences much colder conditions, with minimum temperatures dropping to -9°C (16°F) and maximums only reaching 13°C (56°F). While September sees fairly significant precipitation of 234 mm (9.2 in) across 12 days, January has a reduced precipitation level of 113 mm (4.5 in) over 9 days. Additionally, January's humidity is higher at 88% compared to September's 64%. For more details about the weather in January, you can visit Opatija weather in January.
September and February present distinct weather patterns. In September, temperatures range from a mild 8°C (47°F) at night to a warm 29°C (85°F) during the day, with an average of 19°C (66°F). The month sees about 234 mm (9.2 in) of precipitation over approximately 12 days, with a humidity level of 64%. In contrast, February experiences colder conditions, with temperatures fluctuating from a low of -8°C (19°F) to a high of 21°C (71°F), averaging just 6°C (43°F). Rainfall is somewhat less, totaling 194 mm (7.6 in) over 13 days, but the humidity is higher at 82%. For a closer look at February weather specifics, you can visit Opatija weather in February.
When comparing the weather in September and March, notable differences emerge. September boasts milder temperatures, with a minimum of 8°C (47°F) and an average of 19°C (66°F), reaching a maximum of 29°C (85°F). In contrast, March is significantly chillier, with temperatures ranging from a minimum of -9°C (16°F) to an average of 8°C (46°F) and a maximum of 20°C (68°F). Additionally, September experiences higher precipitation levels at 234 mm (9.2 in) over 12 days, while March sees less rain at 133 mm (5.2 in) across 11 days. Humidity is also higher in March at 73%, compared to 64% in September. For more details on the climate, you can check Opatija weather in March.
September and April present quite contrasting weather patterns. In September, temperatures range from a mild 8°C (47°F) to a warm 29°C (85°F), with an average of 19°C (66°F). The month sees significant precipitation, totaling 234 mm (9.2 in) over approximately 12 days, and humidity levels hover around 64%. Conversely, April experiences cooler conditions, with temperatures dropping as low as -1°C (31°F) and reaching a maximum of 23°C (73°F), averaging 12°C (53°F). Precipitation is less frequent, totaling 133 mm (5.2 in) across about 10 days, but humidity is slightly higher at 73%. For more specific insights about this time of year, you might find the information about Opatija weather in April useful.
When comparing the weather between September and May, September tends to be warmer with temperatures ranging from a minimum of 8°C (47°F) to a maximum of 29°C (85°F), an average of 19°C (66°F), while May has slightly cooler temperatures, with a minimum of 6°C (43°F) and a maximum of 26°C (79°F), averaging 16°C (61°F). September also experiences higher precipitation at 234 mm (9.2 in) across 12 days, compared to May's 184 mm (7.2 in) over 18 days, making May slightly drier despite having more rainy days. Additionally, humidity levels are marginally higher in May at 70%, compared to September's 64%. For more detailed insights, you can check Opatija weather in May.
September and June present contrasting weather patterns. In September, temperatures range from a minimum of 8°C (47°F) to a maximum of 29°C (85°F), with an average of 19°C (66°F). This month experiences higher precipitation, totaling 234 mm (9.2 in) over 12 days, and a humidity level of 64%. In comparison, June welcomes warmer temperatures, with a minimum of 11°C (52°F), an average of 21°C (70°F), and a peak of 35°C (95°F). Precipitation in June is significantly lower at 85 mm (3.3 in) over 9 days, accompanied by slightly higher humidity at 69%. For more details on June weather, you can check Opatija weather in June.
In comparing the weather of September and July, it’s evident that July boasts warmer temperatures with an average of 23°C (73°F) compared to September's 19°C (66°F). July typically experiences a minimum of 15°C (59°F) and can peak at 31°C (88°F), making it the hotter month overall. Precipitation is significantly lower in July, with only 86 mm (3.4 in) over 11 days, while September sees a notable increase in rainfall at 234 mm (9.2 in) across 12 days, contributing to the month’s higher humidity at 64%. For a detailed look at July weather, check out Opatija weather in July.
September and August exhibit notable differences in weather patterns. August is generally warmer, with a minimum temperature of 14°C (58°F) and an average of 23°C (74°F), reaching highs of 32°C (90°F). In contrast, September experiences cooler temperatures, with minimums dipping to 8°C (47°F) and an average of 19°C (66°F), peaking at 29°C (85°F). Additionally, September sees significantly more precipitation, totaling 234 mm (9.2 in) over 12 days, compared to August's 92 mm (3.6 in) over 9 days. Humidity levels are also higher in September at 64%, compared to 51% in August, contributing to a more humid atmosphere. For more details, check out Opatija weather in August.
September and October exhibit notable differences in weather patterns. In September, temperatures range from a minimum of 8°C (47°F) to a maximum of 29°C (85°F), with an average of 19°C (66°F). The month experiences significant precipitation of 234 mm (9.2 in) over about 12 days, coupled with a humidity level of 64%. In contrast, October sees cooler conditions, with minimum temperatures dropping to 5°C (42°F) and maximums reaching 24°C (76°F), averaging 14°C (58°F). Although October has slightly less rainfall at 196 mm (7.7 in) over 11 days, the humidity rises to 83%. For more detailed insights into October weather, you can visit Opatija weather in October.
In September, temperatures are generally more pleasant, with minimums around 8°C (47°F) and averages peaking at 19°C (66°F), often reaching highs of 29°C (85°F). The month sees a moderate level of rainfall at 234 mm (9.2 in) over about 12 days, accompanied by a humidity level of 64%. In contrast, November brings a significant drop in temperatures, with a minimum of just 1°C (33°F) and an average of 10°C (50°F), while maximums reach only up to 19°C (66°F). The precipitation increases slightly to 254 mm (10.0 in) over roughly 14 days, and the humidity rises considerably to 89%. For more specific insights on November weather, you can check Opatija weather in November.
In September, Opatija experiences significantly warmer temperatures, with minimums around 8°C (47°F) and average highs reaching 29°C (85°F), while December sees much cooler weather, with temperatures dipping to a minimum of -2°C (30°F) and an average maximum of only 14°C (58°F). September also boasts a relatively moderate level of precipitation at 234 mm (9.2 in) over 12 days, whereas December is wetter, with 251 mm (9.9 in) falling over 14 days. Additionally, humidity is higher in December at 88%, compared to September’s more comfortable 64%. For more detailed information, you can refer to Opatija weather in December.
As summer fades, September in Opatija offers a delightful transition with mild temperatures that are perfect for outdoor activities. While the days can still reach a warm 29°C, the evenings bring a refreshing coolness, making it an ideal time to explore the coastline. With a notable increase in rainfall compared to the drier summer months, travelers should expect about 12 days of precipitation, fostering the lush scenery that Opatija is known for. Additionally, humidity levels hover around 64%, adding to the comfortable atmosphere. This unique blend of warm days and cooler nights, coupled with increased greenery from the rain, makes September a truly enchanting time to visit. To learn more about the climate nuances throughout the year, check out Opatija Climate.