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September Weather in Bialystok, Poland

Last updated: August 27, 2025

In September, the average temperature in Bialystok, Poland is a comfortable 14°C (57°F), with lows dipping to 0°C (33°F) and highs reaching up to 28°C (83°F). Expect around 68 mm (2.7 in) of precipitation spread over 11 days, and feel the closeness of the air with an average humidity of 72%.

September Temperature in Bialystok

In September in Bialystok, the average temperature is 14°C (57°F). Maximum temperatures can reach 28°C (83°F), while minimums can drop as low as 0°C (33°F). Be sure to pack layers to enjoy your travels comfortably in this variable climate!

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

The chart illustrates September temperature patterns in Bialystok, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Bialystok, September typically has an average temperature of 14°C (57°F), with highs reaching up to 28°C (83°F) and lows dropping to around 0°C (33°F).
JanFebMarAprMayJunJulAugSepOctNovDec293137465566666657494032
Data source: Temperature data for Bialystok 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 Bialystok

In Bialystok in September, the total precipitation amount is 68 mm (2.7 in) spread over a duration of 11 days.

September Precipitation Trends in Bialystok

The chart displays monthly precipitation patterns in Bialystok, 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 Bialystok, September typically receives around 68 mm (2.7 inches) of precipitation spread over approximately 11 days.
JanFebMarAprMayJunJulAugSepOctNovDec444243457560988968643956
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Bialystok

In Bialystok in September humidity is 72%. With an average temperature of 14°C (57°F), this humidity feels like a damp embrace, making outdoor activities slightly uncomfortable and requiring careful planning to stay hydrated and enjoy your travels.

September Average Humidity in Bialystok

This chart illustrates the average monthly humidity levels in Bialystok, 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 Bialystok is approximately 72%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec93%91%88%77%59%59%60%60%72%89%91%93%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Bialystok

In Bialystok in September, the maximum UV index reaches 5, which corresponds to a moderate Exposure Category. Under these conditions, the estimated time to burn is approximately 30 minutes. For more details, you can check the Hourly UV Index in Bialystok.

Maximum UV Index Levels in Bialystok for September

The chart shows the monthly maximum UV Index (UVI) for Bialystok 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 Bialystok typically reaches 5, which falls under the moderate exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec124568775321
Data source: Bialystok 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 Bialystok Compares to Other Months

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

This table compares monthly weather conditions in Bialystok, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-2°C (29°F)44 mm (1.7 inches)93%low
February Weather-1°C (31°F)42 mm (1.6 inches)90%low
March Weather3°C (37°F)42 mm (1.7 inches)88%moderate
April Weather8°C (46°F)45 mm (1.8 inches)77%moderate
May Weather13°C (56°F)75 mm (3.0 inches)59%high
June Weather19°C (66°F)60 mm (2.3 inches)59%very high
July Weather19°C (67°F)98 mm (3.9 inches)60%high
August Weather19°C (66°F)89 mm (3.5 inches)60%high
September Weather14°C (57°F)68 mm (2.7 inches)72%moderate
October Weather9°C (49°F)64 mm (2.5 inches)88%moderate
November Weather5°C (40°F)39 mm (1.5 inches)91%low
December Weather0°C (33°F)56 mm (2.2 inches)93%low

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