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September Weather in Kostrena, Croatia

Last updated: August 23, 2025

In September, the average temperature in Kostrena, Croatia hovers around a pleasant 18°C (64°F), with monthly lows dipping to 7°C (44°F) and highs reaching up to 29°C (85°F). Be prepared for a bit of rain, as the area sees about 194 mm (7.7 in) of precipitation over 11 days. The average humidity rests at a comfortable 64%, making it a great time to explore!

September Temperature in Kostrena

In September in Kostrena, the average temperature is 18°C (64°F), with maximums reaching up to 29°C (85°F) and minimums dipping as low as 7°C (44°F). This mild climate makes it an ideal time for travelers to explore the area comfortably.

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

The chart illustrates September temperature patterns in Kostrena, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Kostrena, September typically has an average temperature of 18°C (64°F), with highs reaching up to 29°C (85°F) and lows dropping to around 7°C (44°F).
JanFebMarAprMayJunJulAugSepOctNovDec374245525969727364554841
Data source: Temperature data for Kostrena generated using information from the Copernicus Climate Change Service.
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The average of daily temperatures (24 hours) calculated across all days in the month.

September Precipitation in Kostrena

In Kostrena in September, the total precipitation amount is 194 mm (7.7 in) over the course of 11 days.

September Precipitation Trends in Kostrena

The chart displays monthly precipitation patterns in Kostrena, 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. In Kostrena, September typically receives around 194 mm (7.7 inches) of precipitation spread over approximately 11 days.
JanFebMarAprMayJunJulAugSepOctNovDec105168115110164748572195162204227
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Kostrena

In Kostrena in September humidity is 64%. With an average temperature of 18°C (64°F), this humidity feels like a pleasant yet slightly sticky embrace, making travel enjoyable but requiring a light layer to stay comfortable while exploring the sights.

September Average Humidity in Kostrena

This chart illustrates the average monthly humidity levels in Kostrena, with September’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In September, average humidity in Kostrena is approximately 64%, offering insight into how humid the weather typically is during this month.
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 Kostrena

In Kostrena in September, the maximum UV index is 7, which corresponds to the high Exposure Category. This means that the time to burn is approximately 25 minutes. For more detailed information, you can check the Hourly UV Index in Kostrena.

Maximum UV Index Levels in Kostrena for September

The chart shows the monthly maximum UV Index (UVI) for Kostrena 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. In September, the maximum UV index in Kostrena typically reaches 7, which falls under the high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec235689987532
Data source: Kostrena 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.

How September Weather in Kostrena Compares to Other Months

Weather in Kostrena varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in Kostrena, focusing on differences in temperature, rainfall, humidity, and UV levels.

This table compares monthly weather conditions in Kostrena, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather3°C (38°F)105 mm (4.1 inches)88%low
February Weather5°C (42°F)168 mm (6.6 inches)82%moderate
March Weather7°C (45°F)115 mm (4.5 inches)73%moderate
April Weather11°C (52°F)110 mm (4.3 inches)73%high
May Weather15°C (59°F)164 mm (6.5 inches)70%very high
June Weather20°C (69°F)74 mm (2.9 inches)69%very high
July Weather22°C (72°F)85 mm (3.3 inches)63%very high
August Weather23°C (73°F)72 mm (2.8 inches)51%very high
September Weather18°C (64°F)194 mm (7.7 inches)64%high
October Weather13°C (56°F)162 mm (6.4 inches)83%moderate
November Weather9°C (48°F)204 mm (8.0 inches)89%moderate
December Weather5°C (41°F)226 mm (8.9 inches)88%low

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