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January Weather in Sienno, Poland

Last updated: August 27, 2025

In January, the average temperature in Sienno, Poland hovers around -1°C (31°F). Expect chilly extremes, with minimum temperatures plummeting to -18°C (-1°F) and highs reaching up to 10°C (51°F). During this period, anticipate 36 mm (1.4 in) of precipitation spread over 10 days, and enjoy the crisp air with an average humidity of 91%.

January Temperature in Sienno

In January in Sienno, the average temperature is -1°C (31°F). Maximums can reach 10°C (51°F), while minimums can dip as low as -18°C (-1°F). Travelers should be prepared for cold weather and varying temperatures during their visit.

January Weather in Sienno: Daily Temperature Highs, Lows, and Averages

The chart illustrates January temperature patterns in Sienno, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Sienno, January typically has an average temperature of -1°C (31°F), with highs reaching up to 10°C (51°F) and lows dropping to around -18°C (-1°F).
JanFebMarAprMayJunJulAugSepOctNovDec313339485767686859504234
Data source: Temperature data for Sienno 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.

January Precipitation in Sienno

In Sienno in January, the precipitation amount is 36 mm (1.4 in) over a span of 10 days.

January Precipitation Trends in Sienno

The chart displays monthly precipitation patterns in Sienno, with values for each month alongside January’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how January’s conditions compare to those of other months. In Sienno, January typically receives around 36 mm (1.4 inches) of precipitation spread over approximately 10 days.
JanFebMarAprMayJunJulAugSepOctNovDec3644385685648510879693947
Data source: Precipitation data for January generated using information from the Copernicus Climate Change Service.
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January Humidity in Sienno

In Sienno in January, humidity is 91%. With an average temperature of -1°C (31°F), this humidity feels like an icy blanket that clings to your skin, making travel challenging as the cold dampness seeps into your bones, leaving you chilled and uncomfortable.

January Average Humidity in Sienno

This chart illustrates the average monthly humidity levels in Sienno, with January’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In January, average humidity in Sienno is approximately 91%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec91%89%86%76%58%56%56%55%68%84%89%91%
Data source: Humidity data for January generated using information from the Copernicus Climate Change Service.

January UV Index in Sienno

In Sienno in January, the maximum UV index is 1, which corresponds to a low Exposure Category. This means you have a time to burn of 45 minutes. For more details, you can check the Hourly UV Index in Sienno.

Maximum UV Index Levels in Sienno for January

The chart shows the monthly maximum UV Index (UVI) for Sienno in January, 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 January, the maximum UV index in Sienno typically reaches 1, which falls under the low exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec124578876321
Data source: Sienno January 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 January Weather in Sienno Compares to Other Months

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

This table compares monthly weather conditions in Sienno, showing how January’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-1°C (31°F)36 mm (1.4 inches)91%low
February Weather1°C (33°F)44 mm (1.7 inches)89%low
March Weather4°C (39°F)38 mm (1.5 inches)86%moderate
April Weather9°C (48°F)56 mm (2.2 inches)76%moderate
May Weather14°C (57°F)85 mm (3.4 inches)58%high
June Weather19°C (67°F)64 mm (2.5 inches)56%very high
July Weather20°C (68°F)85 mm (3.4 inches)56%very high
August Weather20°C (68°F)108 mm (4.2 inches)55%high
September Weather15°C (59°F)79 mm (3.1 inches)68%high
October Weather10°C (51°F)69 mm (2.7 inches)84%moderate
November Weather5°C (42°F)38 mm (1.5 inches)89%low
December Weather1°C (35°F)47 mm (1.9 inches)91%low

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