Herisau Weather in September

With daytime temperatures of 19°C (66°F) and nighttime lows of 10°C (50°F), September in Herisau brings pleasant temperatures during the day. Do keep in mind that quite a bit of rainfall is typical. Around 157 mm (6.2 in) falls on average.

Rainfall in Herisau in September

Looking at the last 30 years, the data shows about 13 days with rain, averaging 157 mm (6.2 in) for the month. Rainfall intensity is on the higher side this month. Expect more substantial showers rather than light, passing rain.

Temperature in Herisau in September

September in Herisau brings typical temperatures with highs around 19°C (66°F) and lows of 10°C (50°F). The difference between afternoon and evening temperatures is usually noticeable. At 10°C (50°F) overnight, it gets properly cold after dark. On the bright side, cold nights tend to make for excellent sleeping conditions.

Sunshine in Herisau in September

With about 155 hours of sunshine, the area enjoys a nice balance of sun and overcast, creating a pleasant environment.

If you're a fan of comfortable temperatures and drier conditions, September is a great time to visit.

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• January
• February
• March
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• May
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• August

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• October
• November
• December

For a detailed overview over the year and the best time to visit Switzerland, check out our Herisau's climate page.

Herisau Temperature in September

Min Temperature 10°C (50°F)  

Max Temperature 19°C (66°F)  

Chance of Rain 44%  

Precipitation 157 mm (6.2 in)  

Rainy days 13 days  

Humidity 78% *  

Sunshine 155 hours *  

Percentage Sunshine 44% *  

* Data from: St. Gallen, Switzerland (8 KM, 5 Miles).

What to Wear in Herisau in September

Comfortable temperatures call for an easy wardrobe in September. Pack summer basics like t-shirts and shorts, but include a light jacket for cooler moments. A pair of comfortable walking shoes is essential. It's going to pour! Pack a good poncho and prepare for very wet conditions. It won't hurt to bring your sunglasses along, as you'll see some sunny periods.

What To Do in Herisau in September

We rated the following activities from 1 (least suitable) to 10 (best) to do.

Swimming

6/10

Camping

3/10

Select a Month

Check the conditions for any month of the year.

• January
• February
• March
• April

• May
• June
• July
• August

• September
• October
• November
• December

For a detailed overview over the year and the best time to visit Switzerland, check out our Herisau's climate page.

More climate data for Herisau

Temperature Rainfall Sunshine Humidity

See the full Herisau climate overview or explore weather in Switzerland.