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September Weather in Wattwil, Switzerland

Last updated: August 27, 2025

In September, the average temperature in Wattwil, Switzerland hovers around 13°C (56°F). Expect a minimum of 1°C (34°F) and a maximum of 26°C (79°F), offering quite a range for the season. With an average precipitation of 150 mm (5.9 in) spread over 16 days, you might want to keep an umbrella handy. Additionally, the average humidity sits at a comfortable 83%, contributing to the region's unique climate.

September Temperature in Wattwil

In September in Wattwil, the average temperature is 13°C (56°F). Maximums can reach 26°C (79°F), and minimums can be as low as 1°C (34°F). This pleasant range makes Wattwil an ideal destination for travelers seeking comfortable weather and outdoor activities.

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

The chart illustrates September temperature patterns in Wattwil, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Wattwil, September typically has an average temperature of 13°C (56°F), with highs reaching up to 26°C (79°F) and lows dropping to around 1°C (34°F).
JanFebMarAprMayJunJulAugSepOctNovDec303439455261636356483933
Data source: Temperature data for Wattwil 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 Wattwil

In Wattwil in September, the precipitation amount is 150 mm (5.9 in) spread over 16 days.

September Precipitation Trends in Wattwil

The chart displays monthly precipitation patterns in Wattwil, 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 Wattwil, September typically receives around 150 mm (5.9 inches) of precipitation spread over approximately 16 days.
JanFebMarAprMayJunJulAugSepOctNovDec1361001249918020320121915013584165
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Wattwil

In Wattwil in September humidity is 83%. With an average temperature of 13°C (56°F), this humidity feels like a damp blanket wrapping around you, making travel a bit uncomfortable as the air feels heavy and the moisture clings to your skin.

September Average Humidity in Wattwil

This chart illustrates the average monthly humidity levels in Wattwil, 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 Wattwil is approximately 83%, 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 September generated using information from the Copernicus Climate Change Service.

September UV Index in Wattwil

In Wattwil in September, the maximum UV index is 6, which corresponds to a high Exposure Category. The time to burn is approximately 25 minutes. To find the hourly UV index in Wattwil, you can refer to this Hourly UV Index in Wattwil.

Maximum UV Index Levels in Wattwil for September

The chart shows the monthly maximum UV Index (UVI) for Wattwil 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 Wattwil typically reaches 6, which falls under the high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec2357810986432
Data source: Wattwil 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 Wattwil Compares to Other Months

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

This table compares monthly weather conditions in Wattwil, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-1°C (30°F)136 mm (5.4 inches)92%low
February Weather1°C (34°F)100 mm (3.9 inches)89%moderate
March Weather4°C (39°F)124 mm (4.9 inches)87%moderate
April Weather7°C (46°F)99 mm (3.9 inches)84%high
May Weather11°C (52°F)180 mm (7.1 inches)80%very high
June Weather16°C (61°F)203 mm (8.0 inches)82%very high
July Weather17°C (63°F)201 mm (7.9 inches)83%very high
August Weather17°C (63°F)219 mm (8.6 inches)80%very high
September Weather13°C (56°F)150 mm (5.9 inches)83%high
October Weather9°C (48°F)135 mm (5.3 inches)90%moderate
November Weather4°C (39°F)84 mm (3.3 inches)88%moderate
December Weather0°C (33°F)165 mm (6.5 inches)90%low

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