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September Weather in Kostinbrod, Bulgaria

Last updated: August 22, 2025

In September, the average temperature in Kostinbrod, Bulgaria hovers around 16°C (61°F). Expect a range from a chilly -2°C (28°F) to a warm 32°C (90°F). This month also brings 25 mm (1.0 in) of precipitation spread over 4 days, contributing to an average humidity of 59%. Stay prepared for a mix of weather!

September Temperature in Kostinbrod

In September in Kostinbrod, the average temperature is 16°C (61°F). Maximum temperatures can reach 32°C (90°F), while minimums can drop as low as -2°C (28°F). Overall, this time of year offers a diverse range of weather, so travelers should be prepared for both warm days and chilly nights.

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

The chart illustrates September temperature patterns in Kostinbrod, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Kostinbrod, September typically has an average temperature of 16°C (61°F), with highs reaching up to 32°C (90°F) and lows dropping to around -2°C (28°F).
JanFebMarAprMayJunJulAugSepOctNovDec283640485764686961514234
Data source: Temperature data for Kostinbrod 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 Kostinbrod

In Kostinbrod in September, the precipitation amount is 25 mm (1.0 in) over the course of 4 days.

September Precipitation Trends in Kostinbrod

The chart displays monthly precipitation patterns in Kostinbrod, 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 Kostinbrod, September typically receives around 25 mm (1.0 inches) of precipitation spread over approximately 4 days.
JanFebMarAprMayJunJulAugSepOctNovDec554774506587683325443768
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Kostinbrod

In Kostinbrod in September, humidity is 59%. With an average temperature of 16°C (61°F), this humidity feels like a refreshing yet slightly damp embrace, making it a comfortable time for sightseeing and exploring, although you might want to carry a light jacket for the occasional chill.

September Average Humidity in Kostinbrod

This chart illustrates the average monthly humidity levels in Kostinbrod, 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 Kostinbrod is approximately 59%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec89%85%83%71%73%67%68%50%59%79%87%89%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Kostinbrod

In Kostinbrod 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 Kostinbrod.

Maximum UV Index Levels in Kostinbrod for September

The chart shows the monthly maximum UV Index (UVI) for Kostinbrod 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 Kostinbrod typically reaches 7, which falls under the high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec24779101097632
Data source: Kostinbrod 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 Kostinbrod Compares to Other Months

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

This table compares monthly weather conditions in Kostinbrod, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-2°C (29°F)55 mm (2.2 inches)89%low
February Weather2°C (36°F)47 mm (1.8 inches)85%moderate
March Weather5°C (40°F)74 mm (2.9 inches)83%high
April Weather9°C (49°F)50 mm (2.0 inches)71%high
May Weather14°C (57°F)65 mm (2.6 inches)73%very high
June Weather18°C (64°F)87 mm (3.4 inches)67%very high
July Weather20°C (68°F)67 mm (2.7 inches)68%very high
August Weather20°C (69°F)33 mm (1.3 inches)50%very high
September Weather16°C (61°F)25 mm (1.0 inches)59%high
October Weather10°C (51°F)44 mm (1.7 inches)79%high
November Weather6°C (42°F)37 mm (1.5 inches)87%moderate
December Weather1°C (34°F)68 mm (2.7 inches)89%low

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