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September Weather in Grunwald, Poland

Last updated: August 27, 2025

In Grunwald, Poland, the average temperature in September hovers around 14°C (58°F), with a minimum of 2°C (36°F) and a maximum reaching up to 30°C (87°F). Expect about 77 mm (3.0 in) of precipitation spread over 12 days, while the average humidity is a comfortable 75%.

September Temperature in Grunwald

In September in Grunwald, the average temperature is 14°C (58°F), with maximums reaching 30°C (87°F) and minimums dropping as low as 2°C (36°F). This wide range makes it important for travelers to pack accordingly for varying weather conditions.

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

The chart illustrates September temperature patterns in Grunwald, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Grunwald, September typically has an average temperature of 14°C (58°F), with highs reaching up to 30°C (87°F) and lows dropping to around 2°C (36°F).
JanFebMarAprMayJunJulAugSepOctNovDec303137465464656557494133
Data source: Temperature data for Grunwald 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 Grunwald

In Grunwald in September, the precipitation amount is 77 mm (3.0 in) spread over 12 days.

September Precipitation Trends in Grunwald

The chart displays monthly precipitation patterns in Grunwald, 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 Grunwald, September typically receives around 77 mm (3.0 inches) of precipitation spread over approximately 12 days.
JanFebMarAprMayJunJulAugSepOctNovDec484647408870997377683751
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Grunwald

In Grunwald in September humidity is 75%. With an average temperature of 14°C (58°F), this humidity feels like a lingering blanket of warmth, making travel both refreshing and a bit stifling, as the moisture in the air may leave you feeling slightly sticky while enjoying outdoor adventures.

September Average Humidity in Grunwald

This chart illustrates the average monthly humidity levels in Grunwald, 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 Grunwald is approximately 75%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec91%90%87%79%63%61%63%65%75%85%90%93%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Grunwald

In Grunwald 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 Grunwald.

Maximum UV Index Levels in Grunwald for September

The chart shows the monthly maximum UV Index (UVI) for Grunwald 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 Grunwald typically reaches 5, which falls under the moderate exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec124568875321
Data source: Grunwald 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 Grunwald Compares to Other Months

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

This table compares monthly weather conditions in Grunwald, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-1°C (31°F)47 mm (1.9 inches)91%low
February Weather0°C (32°F)46 mm (1.8 inches)90%low
March Weather3°C (37°F)47 mm (1.9 inches)87%moderate
April Weather8°C (46°F)40 mm (1.6 inches)79%moderate
May Weather12°C (54°F)88 mm (3.5 inches)63%high
June Weather18°C (65°F)70 mm (2.8 inches)61%very high
July Weather18°C (65°F)99 mm (3.9 inches)63%very high
August Weather18°C (65°F)73 mm (2.9 inches)65%high
September Weather14°C (58°F)77 mm (3.0 inches)75%moderate
October Weather10°C (49°F)68 mm (2.7 inches)85%moderate
November Weather5°C (41°F)37 mm (1.5 inches)90%low
December Weather1°C (34°F)51 mm (2.0 inches)93%low

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