Unterwasser Weather & Climate: Best Time to Visit

Average temperatures, rainfall, sunshine and the best time to visit Unterwasser.

Climate overview of Unterwasser

The climate in Unterwasser, St.Gallen Canton, Switzerland, is marked by large temperature swings across the seasons, ranging from 22°C (72°F) in July to 2°C (36°F) in January.

With around 2097 mm (83 in) of annual rain/snowfall, Unterwasser has a notably wet climate. However, this rain/snowfall is not evenly distributed — the city has a distinct rainy season from May to September, with pleasant summers and cold winters. The wettest month is June. The most sunshine falls in August, with an average of 5.7 hours of daily sunshine.

Unterwasser Weather by Month

Pick a month to see the average temperature, rainfall and sunshine in Unterwasser - and find the best time to visit.

Monthly Temperature in Unterwasser

In Unterwasser, temperatures differ significantly between summer and winter months. Average daytime temperatures reach a pleasant 22°C (72°F) in July. In January, the coolest month of the year, temperatures drop to a chilly 2°C (36°F).

At night, temperatures range from around 11°C (52°F) in July to -6°C (21°F) in January.

Check out our detailed temperature page for more information.

Temperature ranges by month

Rainfall in Unterwasser

Unterwasser experiences significant rain/snowfall throughout the year, averaging 2097 mm (83 in) of precipitation annually. Unterwasser experiences moderate seasonal variation in rainfall, with monthly averages ranging from 260 mm (10 in) in June, the wettest month, and 123 mm (4.8 in) in January, the driest month. For more details, please visit our Unterwasser Precipitation page.

The mean monthly precipitation over the year, including rain, hail, and snow

Sunshine Hours in Unterwasser

Unterwasser experiences moderate variation in sunshine hours across the seasons. With 5.7 hours daily sunshine in August, it dips to 3.7 hours in December, offering a balanced mix of sunny and overcast days.

Visit our detailed sunshine hours page for more information.

Monthly hours of sunshine

Data from: Säntis (the highest mountain in the Alpstein massif), Switzerland (3 KM, 2 Miles).

Daily hours of sunshine

Data from: Säntis (the highest mountain in the Alpstein massif), Switzerland (3 KM, 2 Miles).

Humidity in Unterwasser by Month

Wind Speed in Unterwasser

Best Time to Visit Unterwasser

Compared with the rest of the year, the most comfortable conditions in Unterwasser are usually found in July and August. Conditions are generally least comfortable in January, February, March, April, May, June, September, October, November and December.

Monthly ratings reflect general weather comfort, based on daytime temperature and rainfall. Swimming and winter conditions are highlighted separately where relevant.

  • Best overall: July and August
  • Warmest weather: July and August
  • Most sunshine: April, May, July and August
  • Seasonal pattern: A distinct rainy season from May to September, with pleasant summers and cold winters
  • Coldest conditions: January, with freezing nights around -6°C (21°F).

Frequently asked questions about the climate in Unterwasser

What is the best time to visit Unterwasser?

July and August typically offer the most optimal weather in Unterwasser. In contrast, January, February, March, April, May, June, September, October, November and December tend to have less optimal conditions. Unterwasser has a distinct rainy season from May to September, with pleasant summers and cold winters.

What temperatures can I expect in Unterwasser?

Daytime highs range from 2°C (36°F) in January to 22°C (72°F) in July. Nighttime lows range from -6°C (21°F) to 11°C (52°F). Temperatures vary considerably through the year.

How much rain does Unterwasser get?

Annual rainfall is around 2097 mm (83 in). June is the wettest month with 260 mm (10 in), while January is the driest with 123 mm (4.8 in).

How sunny is Unterwasser?

Unterwasser receives around 1,786 hours of sunshine per year. August is the sunniest month with 170 hours, while December is the cloudiest with just 112 hours.

Unterwasser 3-Day Forecast

Unterwasser 3-Day Forecast

Unterwasser on the map

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