September Weather in Kostanje, Croatia

Last updated: August 23, 2025

In Kostanje, Croatia, the average temperature in September reaches a pleasant 20°C (69°F). Expect lows of around 10°C (50°F) and highs peaking at 30°C (86°F), making for a comfortable climate. Be prepared for 92 mm (3.6 in) of precipitation spread over 7 days, along with an average humidity of 69%. Enjoy the mild weather while exploring!

September Temperature in Kostanje

In September in Kostanje, the average temperature is 20°C (69°F), with maximums reaching 30°C (86°F) and minimums dropping as low as 10°C (50°F). This mild weather makes Kostanje an ideal destination for travelers looking to enjoy outdoor activities comfortably.

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

The chart illustrates September temperature patterns in Kostanje, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Kostanje, September typically has an average temperature of 20°C (69°F), with highs reaching up to 30°C (86°F) and lows dropping to around 10°C (50°F).

Data source: Temperature data for Kostanje generated using information from the Copernicus Climate Change Service.

September Precipitation in Kostanje

In Kostanje in September, the precipitation amount is 92 mm (3.6 in) over the course of 7 days.

September Precipitation Trends in Kostanje

The chart displays monthly precipitation patterns in Kostanje, 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 Kostanje, September typically receives around 92 mm (3.6 inches) of precipitation spread over approximately 7 days.

Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.

Choose your preferred precipitation unit

Millimeters (mm) Inches (in)

September Humidity in Kostanje

In Kostanje in September humidity is 69%. With an average temperature of 20°C (69°F), this humidity feels like a warm, enveloping embrace, making travel feel both refreshing and slightly sticky, as you navigate the vibrant atmosphere with a pleasant sheen of perspiration glistening on your skin.

September Average Humidity in Kostanje

This chart illustrates the average monthly humidity levels in Kostanje, 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 Kostanje is approximately 69%, offering insight into how humid the weather typically is during this month.

Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Kostanje

In Kostanje 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 Kostanje.

Maximum UV Index Levels in Kostanje for September

The chart shows the monthly maximum UV Index (UVI) for Kostanje 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 Kostanje typically reaches 7, which falls under the high exposure category.

Data source: Kostanje 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 Kostanje Compares to Other Months

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

This table compares monthly weather conditions in Kostanje, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	5°C (42°F)	101 mm (4.0 inches)	83%	low
February Weather	7°C (46°F)	114 mm (4.5 inches)	76%	moderate
March Weather	9°C (49°F)	100 mm (3.9 inches)	73%	high
April Weather	13°C (55°F)	89 mm (3.5 inches)	75%	high
May Weather	17°C (63°F)	84 mm (3.3 inches)	78%	very high
June Weather	22°C (71°F)	42 mm (1.6 inches)	75%	very high
July Weather	24°C (75°F)	31 mm (1.2 inches)	71%	very high
August Weather	25°C (77°F)	29 mm (1.2 inches)	65%	very high
September Weather	20°C (69°F)	92 mm (3.6 inches)	69%	high
October Weather	15°C (60°F)	109 mm (4.3 inches)	76%	moderate
November Weather	12°C (54°F)	238 mm (9.4 inches)	81%	moderate
December Weather	8°C (46°F)	230 mm (9.0 inches)	81%	low