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September Weather in Siedlce, Poland

Last updated: August 27, 2025

In September, the average temperature in Siedlce, Poland hovers around 14°C (58°F). While the temperature can dip to a brisk 2°C (36°F), it can also soar to a warm 30°C (86°F). Expect about 102 mm (4.0 in) of precipitation over 12 days, contributing to the overall average humidity of 69%.

September Temperature in Siedlce

In September in Siedlce, the average temperature is 14°C (58°F). The maximum can reach 30°C (86°F), and the minimum can be as low as 2°C (36°F). This variability in temperature makes Siedlce an exciting destination to pack for a range of activities, from warm days to chilly evenings.

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

The chart illustrates September temperature patterns in Siedlce, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Siedlce, September typically has an average temperature of 14°C (58°F), with highs reaching up to 30°C (86°F) and lows dropping to around 2°C (36°F).
JanFebMarAprMayJunJulAugSepOctNovDec303439485666666758504234
Data source: Temperature data for Siedlce 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 Siedlce

In Siedlce in September, the total precipitation amount is 102 mm (4.0 in), occurring over a span of 12 days.

September Precipitation Trends in Siedlce

The chart displays monthly precipitation patterns in Siedlce, 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 Siedlce, September typically receives around 102 mm (4.0 inches) of precipitation spread over approximately 12 days.
JanFebMarAprMayJunJulAugSepOctNovDec4361476811595116125102865570
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Siedlce

In Siedlce in September, humidity is 69%. With an average temperature of 14°C (58°F), this humidity feels like a warm embrace, making it comfortable for traveling, though the air might feel a bit heavy and sticky as you explore.

September Average Humidity in Siedlce

This chart illustrates the average monthly humidity levels in Siedlce, 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 Siedlce is approximately 69%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec91%88%86%77%69%69%63%59%69%85%90%91%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Siedlce

In Siedlce 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 Siedlce, you can refer to this Hourly UV Index in Siedlce.

Maximum UV Index Levels in Siedlce for September

The chart shows the monthly maximum UV Index (UVI) for Siedlce 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 Siedlce typically reaches 6, which falls under the high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec225678876421
Data source: Siedlce 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 Siedlce Compares to Other Months

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

This table compares monthly weather conditions in Siedlce, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-1°C (30°F)43 mm (1.7 inches)91%low
February Weather1°C (34°F)61 mm (2.4 inches)88%low
March Weather4°C (39°F)47 mm (1.8 inches)86%moderate
April Weather9°C (48°F)67 mm (2.7 inches)77%high
May Weather13°C (56°F)114 mm (4.5 inches)69%high
June Weather19°C (66°F)95 mm (3.7 inches)69%very high
July Weather19°C (67°F)116 mm (4.6 inches)63%very high
August Weather19°C (67°F)125 mm (4.9 inches)59%high
September Weather14°C (58°F)102 mm (4.0 inches)69%high
October Weather10°C (50°F)86 mm (3.4 inches)85%moderate
November Weather5°C (42°F)54 mm (2.1 inches)90%low
December Weather1°C (34°F)70 mm (2.8 inches)91%low

Compare Siedlce's Climate with Cities Worldwide