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January Weather in Herisau, Switzerland

Last updated: August 27, 2025

In Herisau, Switzerland, the average temperature in January hovers around 0°C (33°F), with a minimum dipping to -14°C (7°F) and a maximum reaching 14°C (57°F). Expect 106 mm (4.2 in) of precipitation over 12 days, and be prepared for a high average humidity of 92%.

January Temperature in Herisau

In January in Herisau, the average temperature is 0°C (33°F). Maximum temperatures can reach 14°C (57°F), while the minimum can drop as low as -14°C (7°F). Be prepared for a chilly adventure and dress accordingly to make the most of your time exploring!

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

The chart illustrates January temperature patterns in Herisau, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Herisau, January typically has an average temperature of 0°C (33°F), with highs reaching up to 14°C (57°F) and lows dropping to around -14°C (7°F).
JanFebMarAprMayJunJulAugSepOctNovDec333642495565666659514136
Data source: Temperature data for Herisau 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 Herisau

In Herisau in January, the precipitation amount is 106 mm (4.2 in), occurring over a span of 12 days.

January Precipitation Trends in Herisau

The chart displays monthly precipitation patterns in Herisau, 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 Herisau, January typically receives around 106 mm (4.2 inches) of precipitation spread over approximately 12 days.
JanFebMarAprMayJunJulAugSepOctNovDec106851007914716915919512811972135
Data source: Precipitation data for January generated using information from the Copernicus Climate Change Service.
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January Humidity in Herisau

In Herisau in January, humidity is 92%. With an average temperature of 0°C (33°F), this humidity feels like wrapping yourself in a wet, heavy blanket, making travel uncomfortable and chilly, as the damp air penetrates your clothes and makes it challenging to stay warm and dry.

January Average Humidity in Herisau

This chart illustrates the average monthly humidity levels in Herisau, 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 Herisau is approximately 92%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec92%89%87%84%80%82%83%80%83%90%89%90%
Data source: Humidity data for January generated using information from the Copernicus Climate Change Service.

January UV Index in Herisau

In Herisau in January, the maximum UV index is 2, which corresponds to a low exposure category. With this level of UV radiation, the time to burn is approximately 45 minutes. To learn more about the hourly UV index in Herisau, you can visit Hourly UV Index in Herisau.

Maximum UV Index Levels in Herisau for January

The chart shows the monthly maximum UV Index (UVI) for Herisau 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 Herisau typically reaches 2, which falls under the low exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec235689986421
Data source: Herisau 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 Herisau Compares to Other Months

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

This table compares monthly weather conditions in Herisau, showing how January’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather0°C (33°F)106 mm (4.2 inches)92%low
February Weather2°C (37°F)85 mm (3.3 inches)89%moderate
March Weather5°C (42°F)100 mm (3.9 inches)87%moderate
April Weather9°C (49°F)79 mm (3.1 inches)84%high
May Weather13°C (56°F)147 mm (5.8 inches)80%very high
June Weather18°C (65°F)168 mm (6.6 inches)82%very high
July Weather19°C (67°F)159 mm (6.3 inches)83%very high
August Weather19°C (66°F)194 mm (7.7 inches)80%very high
September Weather15°C (59°F)128 mm (5.0 inches)83%high
October Weather10°C (51°F)119 mm (4.7 inches)90%moderate
November Weather5°C (42°F)72 mm (2.8 inches)88%low
December Weather2°C (36°F)135 mm (5.3 inches)90%low

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