September Weather in Krk, Croatia

Last updated: March 17, 2025

In September, Krk, Croatia, experiences a delightful transition into autumn with temperatures ranging from a minimum of 11°C (51°F) to a maximum of 29°C (85°F), averaging around 20°C (69°F). This month brings about a mix of warm days and cooler evenings, perfect for outdoor activities. However, travelers should prepare for potential rain, as September sees an average precipitation of 199 mm (7.8 in) over 10 rainy days, coupled with a humidity level of 64%. Whether soaking in the sun or enjoying the crisp evening air, Krk offers a charming escape in September.

September Temperature in Krk

As summer gracefully transitions to autumn, September in Krk, Croatia, showcases a delightful blend of warmth and milder breezes. With minimum temperatures settling around 11°C (51°F) and an inviting average of 20°C (69°F), days are still pleasantly warm, reaching up to 29°C (85°F) during the peak. This month often attracts those looking for a balance between sun-soaked relaxation and the enchanting serene atmosphere that early fall brings. While temperatures dip slightly from the sweltering highs of August, September retains a comfortable warmth that makes it an ideal time for exploring Krk's vibrant landscapes and azure waters before the chill of October sets in.

September Weather in Krk: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in Krk, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends.
JanFebMarAprMayJunJulAugSepOctNovDec444749556372767769615448
Data source: Temperature data for Krk generated using information from the Copernicus Climate Change Service.
Choose your preferred temperature unit
The average of daily temperatures (24 hours) calculated across all days in the month.

September Precipitation in Krk

September in Krk, Croatia, marks a significant shift in precipitation patterns, with an impressive 199 mm (7.8 in) of rainfall spread over 10 days. This surge contrasts notably with the lull of summer months, where July and August saw just 50 mm (2.0 in) and 53 mm (2.1 in) respectively. The arrival of autumn brings not only a promising increase in moisture but also sets the stage for the even wetter months ahead, as October and November receive 152 mm (6.0 in) and 213 mm (8.4 in) respectively. This seasonal transition highlights Krk's climate variability, where the refreshing rains in September prepare the landscape for the lush, vibrant colors of fall.

September Precipitation Trends in Krk

The chart displays monthly precipitation patterns in Krk, with values for each month alongside September's data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how September's conditions compare to those of other months.
JanFebMarAprMayJunJulAugSepOctNovDec11116110189127435053199152213245
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
Choose your preferred precipitation unit

September Humidity in Krk

In September, Krk, Croatia, experiences a noticeable shift in humidity, with levels averaging around 64%. Following the summer months, where humidity dipped to a pleasant 51% in August, September marks a subtle increase, reflecting the transition to autumn. This rise in moisture levels is still significantly lower than the winter peaks, with January and February showcasing much higher averages of 88% and 82% respectively. Overall, September offers a comfortable balance, as the lingering warmth of summer begins to blend with the crispness that autumn brings, making it an inviting time to enjoy the coastal beauty of the island.

September Average Humidity in Krk

This chart illustrates the average monthly humidity levels in Krk, with September's data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, allowing you to see how September's humidity levels compare to other months.
JanFebMarAprMayJunJulAugSepOctNovDec88%82%73%73%70%69%63%51%64%83%89%88%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Krk

As summer transitions to autumn, September in Krk, Croatia, showcases a UV Index of 7, placing it within the high exposure category. This means that while the sun's rays are still strong, the risk of harm from unprotected sun exposure decreases compared to the summer peaks of UV Index 9 in June and July. With a burn time of approximately 25 minutes, individuals can enjoy the pleasant early fall weather, but should remain vigilant about sun protection, especially around midday. This steady decline from the intense summer levels indicates a gradual shift, making September an ideal time for outdoor activities, all while keeping in mind the importance of sun safety. For more detailed information, check out Krk UV Index.

Maximum UV Index Levels in Krk for September

The chart shows the monthly maximum UV Index (UVI) for Krk in September, representing the highest UV radiation level. The UVI measures the intensity of ultraviolet radiation from the sun, indicating the potential risk of sunburn and UV-related health issues.
JanFebMarAprMayJunJulAugSepOctNovDec235689987532
Data source: Krk September UVI data generated using information from the Copernicus Climate Change Service.

UV Risk Categories

  •  Extreme (11+): Avoid the sun, stay in shade.
  •  Very High (8-10): Limit sun exposure.
  •  High (6-7): Use SPF 30+ and protective clothing.
  •  Moderate (3-5): Midday shade recommended.
  •  Low (0-2): No protection needed.

September Sunshine in Krk

September in Krk, Croatia, welcomes a delightful transition from the vibrant summer months, boasting 331 hours of sunshine. This marks a gentle decline from July's peak of 432 hours, yet remains impressively bright, significantly outshining the earlier months of the year. As summer fades, the sun still generously graces the island, allowing visitors to savor the warm weather and stunning landscapes. This trend of bright, sunny days continues into autumn, with October also enjoying a respectable 302 hours, making September a splendid time to explore the island's charm before cooler days set in. With each hour of sunshine, Krk remains a picturesque destination, enticing travelers to embrace the beauty of early fall.

Monthly Sunshine Duration in Krk: September Highlighted

The September sunshine duration represents the total number of hours Krk experiences direct sunlight during the month of September, excluding cloudy or obstructed periods. This chart compares the sunshine duration of September with the other months of the year.
JanFebMarAprMayJunJulAugSepOctNovDec185h232h320h349h384h420h432h401h331h302h233h223h
Data source: Krk September Sunshine duration data generated using information from the Copernicus Climate Change Service.

Chance of Sun in Krk During September

September in Krk, Croatia, boasts a reassuring 61% chance of sunny weather, making it a delightful time for those seeking warmth and outdoor activities after the peak summer months. The likelihood of sunshine slightly dips from the heights of August (65%) but still remains robust, surpassing typical early autumn averages. This transitional month showcases a gentle blend of summer's lingering glow while gradually welcoming the milder climate of fall. Visitors can enjoy pleasantly sunny days, ideal for exploring the island's stunning landscapes and rich history before the weather shifts further into winter. Overall, September stands out as a favorable choice for sun-seekers and adventure enthusiasts alike.

Percentage of Sunny Days in September in Krk

The chart illustrates the percentage of sunny days in Krk throughout the year, with September highlighted. It highlights the variation in sunshine across each month and provides an overview of the typical frequency of sunny days, offering insights into how often Krk experiences clear skies throughout the year.
JanFebMarAprMayJunJulAugSepOctNovDec30%42%66%45%44%62%57%65%61%51%32%40%
Data source: Krk September chance of sun data, generated using information from the Copernicus Climate Change Service.

Daylight Hours in Krk in September

As summer gracefully transitions into autumn, September in Krk, Croatia, offers a delightful blend of warmth and diminishing daylight. With approximately 12 hours of sunlight, September marks a gentle decline from the 15 hours enjoyed in the peak of July and June. This shift signals the arrival of fall, as daylight gradually wanes into October's 10 hours. The month strikes a perfect balance, allowing visitors to relish the lingering summer vibes while embracing the early signs of the seasonal change. It's a time when outdoor activities are still vibrant, yet the crowds begin to thin, making for a more serene experience on this stunning Adriatic island.

Average Daylight Hours in Krk for September

The chart illustrates the variation in daylight duration in Krk throughout the year, with September highlighted. It shows the monthly changes in daylight hours, calculated by summing the hours between sunrise and sunset.
JanFebMarAprMayJunJulAugSepOctNovDec9h 12m10h 24m11h 56m13h 30m14h 51m15h 32m15h 10m13h 59m12h 28m10h 55m9h 32m8h 49m
Data source: Krk daylight hours, calculated by summing the hours between sunrise and sunset for each day.

September Winds in Krk

As summer transitions to autumn, September in Krk, Croatia, experiences a gentle shift in its winds, with an average wind speed of 3.2 m/s (7 mph). This slight decrease from the summer months reflects a calming of the breezes that once danced across the Adriatic coastline. Notably, the wind speeds during September remain steady compared to the previous months, but it's a precursor to the forthcoming increase in wind activity as October approaches. With an uptick to 4.8 m/s (11 mph), the winds will soon usher in the crisp feel of fall, illustrating a dynamic interplay between the warm summer air and the cooler autumn atmosphere. This month serves as a beautiful transition, where the lingering warmth of summer meets the refreshing breath of autumn.

Average September Wind Speed in Krk

The chart displays monthly wind speed patterns in Krk, with values for each month shown alongside September's data, which is highlighted for easy comparison. It illustrates the average wind speed, offering insights into how September's wind conditions compare to the rest of the year.
JanFebMarAprMayJunJulAugSepOctNovDec4.24.13.73.73.62.63.03.63.2 m/s4.84.83.8
Data source: Krk September wind data, generated using information from the Copernicus Climate Change Service.

How September Weather in Krk Compares to Other Months

The weather in Krk 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 Krk and find detailed weather information for every month.

September and January present stark contrasts in weather conditions. In September, temperatures range from a minimum of 11°C (51°F) to a pleasant average of 20°C (69°F), peaking at a warm 29°C (85°F). The month experiences around 199 mm (7.8 in) of rainfall spread over 10 days, with humidity hovering around 64%. In contrast, January brings much colder weather, with temperatures dropping to a minimum of -6°C (21°F) and averaging only 7°C (44°F), reaching a maximum of 14°C (58°F). Precipitation is lower at 111 mm (4.4 in) across 9 days, while humidity rises significantly to 88%. For a closer look at the winter weather conditions, you can check Krk weather in January.

September and February present contrasting weather conditions. In September, temperatures range from a minimum of 11°C (51°F) to a maximum of 29°C (85°F), offering a pleasant average of 20°C (69°F). The month experiences considerable rainfall, with 199 mm (7.8 in) of precipitation over approximately 10 days, and a relative humidity of 64%. In contrast, February brings much colder temperatures, with a minimum of -5°C (23°F) and a maximum of 20°C (68°F), leading to an overall average of 8°C (47°F). Despite slightly less precipitation at 161 mm (6.4 in) across 13 days, February is characterized by higher humidity at 82%. For more details, check out Krk weather in February.

When comparing the weather in September and March, significant differences are evident. September experiences warmer temperatures, with averages of 20°C (69°F) and highs reaching up to 29°C (85°F), creating a pleasant early autumn ambiance. In contrast, March has much cooler temperatures, with an average of only 9°C (49°F) and lows dipping to -6°C (21°F), indicating the lingering chill of early spring. Precipitation is more pronounced in September, totaling 199 mm (7.8 in) over about 10 days, whereas March sees lower precipitation at 101 mm (4.0 in) over roughly 11 days. Humidity levels are higher in March at 73%, compared to 64% in September. For more detailed weather information, you can check out Krk weather in March.

September and April present quite different weather profiles. In September, temperatures range from a mild 11°C (51°F) to a warm 29°C (85°F), averaging around 20°C (69°F), while April offers cooler temperatures with a minimum of 1°C (35°F) and a maximum of 22°C (72°F), averaging 13°C (55°F). Notably, September experiences significantly more precipitation, totaling 199 mm (7.8 in) over 10 days, compared to April's 89 mm (3.5 in) over 9 days. Additionally, humidity is slightly lower in September at 64%, compared to April's 73%. For more details on weather patterns in April, you can check Krk weather in April.

In comparing the weather of September and May, September tends to be warmer with average temperatures reaching 20°C (69°F) and highs of 29°C (85°F), while May has a cooler average temperature of 17°C (63°F) and maximums of 26°C (79°F). Precipitation is more significant in September, totaling 199 mm (7.8 in) over 10 days compared to May's 127 mm (5.0 in) spread across 13 days. Additionally, humidity levels are slightly lower in September at 64%, in contrast to May's higher humidity of 70%. For more detailed insights on May weather, visit Krk weather in May.

In comparing the weather between September and June, it is evident that June typically experiences warmer temperatures, with a maximum average of 33°C (92°F) compared to September's maximum of 29°C (85°F). The average temperature in June is also slightly higher at 22°C (72°F), while September averages around 20°C (69°F). Furthermore, June boasts significantly lower precipitation levels, receiving only 43 mm (1.7 in) over about 4 days, while September sees much wetter conditions with 199 mm (7.8 in) of rain spread over 10 days. The humidity is slightly higher in June at 69%, compared to 64% in September. For more specific details about the weather in June, you can visit Krk weather in June.

When comparing September and July weather, we see distinct differences in temperature and precipitation. July boasts higher temperatures, with an average of 24°C (76°F) and a maximum of 31°C (87°F), making it the warmest month. In contrast, September has a cooler average temperature of 20°C (69°F), with maximums reaching 29°C (85°F). Additionally, July experiences significantly less rainfall, with only 50 mm (2.0 in) over about four days, while September sees much heavier precipitation at 199 mm (7.8 in) across ten days. The humidity levels remain similar, with July at 63% and September at 64%. For more detailed insights about July weather specifically, you can check out Krk weather in July.

September weather is generally cooler and wetter compared to August. While September sees an average temperature of 20°C (69°F) with a maximum of 29°C (85°F), August enjoys warmer conditions with an average of 25°C (77°F) and peaks at 32°C (90°F). Additionally, September experiences significantly more precipitation, totaling 199 mm (7.8 in) over 10 days, while August is much drier, with only 53 mm (2.1 in) across 5 days. Humidity also rises in September to 64%, compared to 51% in August. For a detailed look at August weather, you can check this link: Krk weather in August.

September weather brings milder temperatures, with an average of 20°C (69°F) and highs reaching up to 29°C (85°F). In contrast, October sees a notable drop in temperatures, averaging around 16°C (61°F) and peaking at 23°C (74°F). While September experiences a bit more rain, totaling 199 mm (7.8 in) over approximately 10 days, October has slightly less precipitation at 152 mm (6.0 in) spread across 11 days. Humidity levels also rise in October to 83%, compared to September's 64%. For more details on October weather, visit Krk weather in October.

September and November exhibit contrasting weather patterns as summer fades into autumn. In September, temperatures range from a mild 11°C (51°F) at night to a warm 29°C (85°F) during the day, with an average of 20°C (69°F). The month experiences 199 mm (7.8 in) of precipitation over approximately 10 days, accompanied by a moderate humidity level of 64%. In sharp contrast, November brings cooler temperatures, with minimums dropping to 3°C (38°F) and daytime highs reaching only 19°C (67°F), averaging 12°C (54°F). Additionally, November sees increased precipitation at 213 mm (8.4 in) spread over 14 days and a notable rise in humidity to 89%. For more detailed insights on weather conditions, check Krk weather in November.

In September, the weather is considerably warmer, with average temperatures ranging from a minimum of 11°C (51°F) to a maximum of 29°C (85°F). This month sees an average humidity of 64% and experiences about 199 mm (7.8 in) of precipitation over approximately 10 days. In contrast, December brings much cooler temperatures, averaging between 2°C (35°F) and 16°C (61°F), with a significantly higher humidity level of 88%. Additionally, December experiences more precipitation, totaling 245 mm (9.7 in) across about 15 days. For a detailed look at December weather conditions, you can check Krk weather in December.

Compare Krk's Climate with Cities Worldwide

Conclusion: What to Expect From September Weather in Krk

As summer gracefully transitions into autumn, September on Krk offers a delightful blend of warm days and cooler evenings. The month typically boasts pleasant temperatures that encourage outdoor exploration, while the humidity remains manageable. Unlike the bustling heat of July and August, September brings a refreshing change, enhanced by occasional rain showers that nourish the landscape. With an average of 64% humidity and a total precipitation of around 199 mm over about 10 days, this month strikes a balance between sun-soaked days and refreshing breezes. If you're planning a visit, September is a perfect time to experience the charming beauty of Krk without the summer crowds. For more insights on what to expect throughout the year, check out Krk Climate.