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September Weather in Trebnje, Slovenia

Last updated: August 27, 2025

In September, the average temperature in Trebnje, Slovenia hovers around 16°C (62°F). Expect minimum temperatures dipping to 2°C (36°F) and a comfortable maximum reaching up to 31°C (89°F). During this month, you can anticipate 143 mm (5.6 in) of precipitation spread over 12 days, with an average humidity of 64%.

September Temperature in Trebnje

In September in Trebnje, the average temperature is 16°C (62°F). Maximum temperatures can reach 31°C (89°F), while the minimum can drop to as low as 2°C (36°F). This makes Trebnje a great destination for travelers looking to enjoy mild weather with the option for warm afternoons and cool evenings.

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

The chart illustrates September temperature patterns in Trebnje, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Trebnje, September typically has an average temperature of 16°C (62°F), with highs reaching up to 31°C (89°F) and lows dropping to around 2°C (36°F).
JanFebMarAprMayJunJulAugSepOctNovDec343944525969717162534437
Data source: Temperature data for Trebnje 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 Trebnje

In Trebnje in September, the total precipitation amount is 143 mm (5.6 in) over the course of 12 days.

September Precipitation Trends in Trebnje

The chart displays monthly precipitation patterns in Trebnje, 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 Trebnje, September typically receives around 143 mm (5.6 inches) of precipitation spread over approximately 12 days.
JanFebMarAprMayJunJulAugSepOctNovDec44725881145811029414389109100
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Trebnje

In Trebnje in September humidity is 64%. With an average temperature of 16°C (62°F), this humidity feels like a moderate blanket wrapping around you, making it pleasant for traveling but potentially a bit damp as you explore the sights.

September Average Humidity in Trebnje

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

In Trebnje in September, the maximum UV index is 6, which corresponds to a high Exposure Category. The time to burn is approximately 25 minutes. To find the hourly UV index in Trebnje, you can refer to this Hourly UV Index in Trebnje.

Maximum UV Index Levels in Trebnje for September

The chart shows the monthly maximum UV Index (UVI) for Trebnje 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 Trebnje typically reaches 6, which falls under the high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec235689986532
Data source: Trebnje 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 Trebnje Compares to Other Months

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

This table compares monthly weather conditions in Trebnje, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather1°C (34°F)44 mm (1.7 inches)88%low
February Weather4°C (39°F)72 mm (2.8 inches)82%moderate
March Weather7°C (44°F)57 mm (2.3 inches)73%moderate
April Weather11°C (52°F)81 mm (3.2 inches)73%high
May Weather15°C (59°F)145 mm (5.7 inches)70%very high
June Weather21°C (69°F)81 mm (3.2 inches)69%very high
July Weather22°C (71°F)102 mm (4.0 inches)63%very high
August Weather22°C (72°F)94 mm (3.7 inches)51%very high
September Weather16°C (62°F)143 mm (5.6 inches)64%high
October Weather12°C (53°F)89 mm (3.5 inches)83%moderate
November Weather7°C (44°F)109 mm (4.3 inches)89%moderate
December Weather3°C (37°F)100 mm (3.9 inches)88%low

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