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September Weather in Suwalki, Poland

Last updated: August 27, 2025

The average temperature in Suwalki, Poland during September is a mild 14°C (57°F). Expect temperatures to range from a chilly 0°C (32°F) to a warm 27°C (82°F). During this period, precipitation averages 69 mm (2.7 in) over the course of 10 days, while the average humidity hovers around 72%.

September Temperature in Suwalki

In September in Suwalki, the average temperature is 14°C (57°F). Maximums can reach 27°C (82°F), while minimums can drop as low as 0°C (32°F). This makes Suwalki a great destination for travelers seeking a mild climate with the possibility of both warm days and crisp nights.

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

The chart illustrates September temperature patterns in Suwalki, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Suwalki, September typically has an average temperature of 14°C (57°F), with highs reaching up to 27°C (82°F) and lows dropping to around 0°C (32°F).
JanFebMarAprMayJunJulAugSepOctNovDec293036455465656557484032
Data source: Temperature data for Suwalki 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 Suwalki

In Suwalki in September, the precipitation amount is 69 mm (2.7 in) spread over a period of 10 days.

September Precipitation Trends in Suwalki

The chart displays monthly precipitation patterns in Suwalki, 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 Suwalki, September typically receives around 69 mm (2.7 inches) of precipitation spread over approximately 10 days.
JanFebMarAprMayJunJulAugSepOctNovDec433642457054968569624055
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Suwalki

In Suwalki 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 Suwalki

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

In Suwalki 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 Suwalki.

Maximum UV Index Levels in Suwalki for September

The chart shows the monthly maximum UV Index (UVI) for Suwalki 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 Suwalki typically reaches 5, which falls under the moderate exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec124568765321
Data source: Suwalki 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 Suwalki Compares to Other Months

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

This table compares monthly weather conditions in Suwalki, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-2°C (29°F)43 mm (1.7 inches)93%low
February Weather-1°C (30°F)36 mm (1.4 inches)90%low
March Weather2°C (36°F)42 mm (1.6 inches)88%moderate
April Weather7°C (45°F)45 mm (1.8 inches)77%moderate
May Weather12°C (54°F)70 mm (2.8 inches)59%high
June Weather18°C (65°F)54 mm (2.1 inches)59%very high
July Weather19°C (66°F)95 mm (3.8 inches)60%high
August Weather18°C (65°F)85 mm (3.3 inches)60%high
September Weather14°C (57°F)69 mm (2.7 inches)72%moderate
October Weather9°C (48°F)62 mm (2.4 inches)88%moderate
November Weather4°C (40°F)40 mm (1.6 inches)91%low
December Weather0°C (32°F)55 mm (2.2 inches)93%low

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