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September Weather in Kostel, Slovenia

Last updated: August 27, 2025

In September, the average temperature in Kostel, Slovenia is a pleasant 15°C (59°F), with temperatures ranging from a chilly 1°C (34°F) to a warm 29°C (85°F). Expect about 159 mm (6.3 in) of precipitation over 12 days, contributing to an average humidity of 64%.

September Temperature in Kostel

In September in Kostel, the average temperature is 15°C (59°F). Maximums can reach 29°C (85°F) and minimums can be as low as 1°C (34°F). This makes it a great time for travelers to experience a pleasant mix of warm days and cool evenings, ideal for outdoor activities and exploration.

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

The chart illustrates September temperature patterns in Kostel, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Kostel, September typically has an average temperature of 15°C (59°F), with highs reaching up to 29°C (85°F) and lows dropping to around 1°C (34°F).
JanFebMarAprMayJunJulAugSepOctNovDec313741485666686859514335
Data source: Temperature data for Kostel 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 Kostel

In Kostel in September, the precipitation amount is 159 mm (6.3 in) spread over a period of 12 days.

September Precipitation Trends in Kostel

The chart displays monthly precipitation patterns in Kostel, 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 Kostel, September typically receives around 159 mm (6.3 inches) of precipitation spread over approximately 12 days.
JanFebMarAprMayJunJulAugSepOctNovDec7110981110183108142109159119127139
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Kostel

In Kostel in September humidity is 64%. With an average temperature of 15°C (59°F), this humidity feels like a refreshing embrace, making traveling comfortable yet slightly sticky; perfect for leisurely strolls but perhaps a bit challenging for those sensitive to heat.

September Average Humidity in Kostel

This chart illustrates the average monthly humidity levels in Kostel, 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 Kostel 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 Kostel

In Kostel 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 Kostel.

Maximum UV Index Levels in Kostel for September

The chart shows the monthly maximum UV Index (UVI) for Kostel 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 Kostel typically reaches 7, which falls under the high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec235789987532
Data source: Kostel 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 Kostel Compares to Other Months

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

This table compares monthly weather conditions in Kostel, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather0°C (32°F)71 mm (2.8 inches)88%low
February Weather3°C (37°F)109 mm (4.3 inches)82%moderate
March Weather5°C (41°F)81 mm (3.2 inches)73%moderate
April Weather9°C (49°F)110 mm (4.3 inches)73%high
May Weather13°C (56°F)183 mm (7.2 inches)70%very high
June Weather19°C (66°F)108 mm (4.3 inches)69%very high
July Weather20°C (68°F)142 mm (5.6 inches)63%very high
August Weather20°C (68°F)109 mm (4.3 inches)51%very high
September Weather15°C (59°F)159 mm (6.3 inches)64%high
October Weather10°C (51°F)119 mm (4.7 inches)83%moderate
November Weather6°C (43°F)127 mm (5.0 inches)89%moderate
December Weather2°C (36°F)139 mm (5.5 inches)88%low

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