St. Gallen Weather in September

St. Gallen in September sees pleasant temperatures, with highs around 19°C (66°F) and overnight lows of 10°C (50°F). Rainfall is fairly high at around 145 mm (5.7 in) on average, so pack waterproofs just in case.

Rainfall in St. Gallen in September

On average, there are about 13 days with rain during this month, averaging 145 mm (5.7 in). When showers do arrive, they tend to be on the heavier side. Worth being prepared even if rain days are not that numerous.

Temperature in St. Gallen in September

Daytime temperatures in St. Gallen reach 19°C (66°F) in September, dropping to 10°C (50°F) at night. Temperatures can feel cooler in the morning and evening, so layering is often the best approach. At 10°C (50°F) overnight, it can feel quite a bit cooler after dark. Worth packing something warmer for evenings, but the cooler temperatures are ideal for sleeping.

Sunshine in St. Gallen 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
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• May
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• September
• October
• November
• December

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

St. Gallen Temperature in September

Min Temperature 10°C (50°F)  

Max Temperature 19°C (66°F)  

Chance of Rain 43%  

Precipitation 145 mm (5.7 in)  

Rainy days 13 days  

Humidity 78%  

Sunshine 155 hours  

Percentage Sunshine 44%  

What to Wear in St. Gallen in September

For St. Gallen in September, you'll want flexible clothing. It's wise to pack cotton shirts, comfortable shorts, and a pair of jeans for cooler evenings. A light sweater or jacket is useful for air-conditioned spaces (like buses) or unexpected cool moments. High rain levels are expected, so pack waterproof gear and an umbrella or poncho. It won't hurt to bring your sunglasses along, as you'll see some sunny periods.

What To Do in St. Gallen in September

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

Swimming

6/10

Cycling

9/10

Walking

9/10

Camping

6/10

Outdoor sports

9/10

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 St. Gallen's climate page.

More climate data for St. Gallen

Temperature Rainfall Sunshine Humidity

See the full St. Gallen climate overview or explore weather in Switzerland.