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September Weather in Sierpc, Poland

Last updated: August 27, 2025

In September, the average temperature in Sierpc, Poland hovers around 15°C (58°F), making it a pleasantly mild time of year. Expect minimums of 2°C (36°F) and delightful maximums reaching up to 31°C (88°F). With 85 mm (3.3 in) of precipitation over about 12 days, a few showers may add to the freshness of the season. Humidity is typically around 75%, contributing to that classic, cozy feeling of warmth in the air.

September Temperature in Sierpc

In September in Sierpc, the average temperature is 15°C (58°F). Maximum temperatures can reach 31°C (88°F), while the minimum can drop as low as 2°C (36°F). It's advisable to pack for both warm and cooler weather when traveling during this time.

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

The chart illustrates September temperature patterns in Sierpc, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Sierpc, September typically has an average temperature of 15°C (58°F), with highs reaching up to 31°C (88°F) and lows dropping to around 2°C (36°F).
JanFebMarAprMayJunJulAugSepOctNovDec313338475566666658504134
Data source: Temperature data for Sierpc 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 Sierpc

In Sierpc in September, the precipitation amount is 85 mm (3.3 in) over a duration of 12 days.

September Precipitation Trends in Sierpc

The chart displays monthly precipitation patterns in Sierpc, 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 Sierpc, September typically receives around 85 mm (3.3 inches) of precipitation spread over approximately 12 days.
JanFebMarAprMayJunJulAugSepOctNovDec424642358570857685633247
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Sierpc

In Sierpc in September humidity is 75%. With an average temperature of 15°C (58°F), this humidity feels like you're stepping into a warm, damp blanket, making travel a bit more challenging as the air clings to your skin, leaving you craving a refreshing breeze along the way.

September Average Humidity in Sierpc

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

In Sierpc 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 Sierpc.

Maximum UV Index Levels in Sierpc for September

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

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

This table compares monthly weather conditions in Sierpc, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather0°C (32°F)42 mm (1.6 inches)91%low
February Weather0°C (33°F)46 mm (1.8 inches)90%low
March Weather3°C (38°F)42 mm (1.6 inches)87%moderate
April Weather8°C (47°F)35 mm (1.4 inches)79%moderate
May Weather13°C (56°F)85 mm (3.4 inches)63%high
June Weather19°C (66°F)70 mm (2.7 inches)61%very high
July Weather19°C (67°F)85 mm (3.4 inches)63%very high
August Weather19°C (67°F)76 mm (3.0 inches)65%high
September Weather15°C (58°F)85 mm (3.3 inches)75%moderate
October Weather10°C (50°F)63 mm (2.5 inches)85%moderate
November Weather5°C (42°F)32 mm (1.3 inches)90%low
December Weather1°C (35°F)47 mm (1.8 inches)93%low

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