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September Weather in Simitli, Bulgaria

Last updated: August 22, 2025

In September, the average temperature in Simitli, Bulgaria is a comfortable 18°C (64°F). However, temperatures can vary widely, dipping as low as -1°C (31°F) at night and soaring up to 32°C (90°F) during the day. Visitors can expect about 28 mm (1.1 in) of precipitation over 3 days, along with an average humidity level of 57%, creating a pleasant atmosphere for outdoor activities.

September Temperature in Simitli

In September in Simitli, the average temperature is 18°C (64°F). Maximums can reach 32°C (90°F) and minimums can be as low as -1°C (31°F). Travelers should be prepared for a wide range of temperatures, so packing layers is advisable.

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

The chart illustrates September temperature patterns in Simitli, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Simitli, September typically has an average temperature of 18°C (64°F), with highs reaching up to 32°C (90°F) and lows dropping to around -1°C (31°F).
JanFebMarAprMayJunJulAugSepOctNovDec323943505966707264534537
Data source: Temperature data for Simitli 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 Simitli

In Simitli in September, the precipitation amount is 28 mm (1.1 in) over the course of 3 days.

September Precipitation Trends in Simitli

The chart displays monthly precipitation patterns in Simitli, 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 Simitli, September typically receives around 28 mm (1.1 inches) of precipitation spread over approximately 3 days.
JanFebMarAprMayJunJulAugSepOctNovDec635593655758372328545398
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Simitli

In Simitli in September, humidity is 57%. With an average temperature of 18°C (64°F), this humidity feels like a refreshing embrace, making it pleasant for traveling as long as you stay hydrated and enjoy light, breathable clothing.

September Average Humidity in Simitli

This chart illustrates the average monthly humidity levels in Simitli, 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 Simitli is approximately 57%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec88%83%81%71%74%63%60%47%57%76%85%87%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Simitli

In Simitli in September, the maximum UV index is 8, which corresponds to a very high Exposure Category. This means that the time to burn is only 15 minutes. For more detailed information, you can refer to the Hourly UV Index in Simitli.

Maximum UV Index Levels in Simitli for September

The chart shows the monthly maximum UV Index (UVI) for Simitli 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 Simitli typically reaches 8, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec24789101098642
Data source: Simitli 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 Simitli Compares to Other Months

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

This table compares monthly weather conditions in Simitli, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather0°C (33°F)63 mm (2.5 inches)88%low
February Weather4°C (39°F)55 mm (2.2 inches)83%moderate
March Weather6°C (43°F)93 mm (3.6 inches)81%high
April Weather10°C (51°F)64 mm (2.5 inches)71%very high
May Weather15°C (59°F)57 mm (2.3 inches)74%very high
June Weather19°C (66°F)58 mm (2.3 inches)63%very high
July Weather21°C (71°F)37 mm (1.4 inches)60%very high
August Weather22°C (72°F)23 mm (0.9 inches)47%very high
September Weather18°C (64°F)28 mm (1.1 inches)57%very high
October Weather12°C (54°F)54 mm (2.1 inches)76%high
November Weather7°C (46°F)53 mm (2.1 inches)85%moderate
December Weather3°C (38°F)98 mm (3.9 inches)87%low

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