Sommeri Weather in September

Sommeri in September averages 19°C (66°F) during the day and 11°C (52°F) at night. Keep in mind that quite a bit of rainfall is expected this month.

Rainfall in Sommeri in September

Based on our climate data of the past 30 years, about 13 days of rain are anticipated, with 127 mm (5 in) on average. 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 Sommeri in September

Temperatures in Sommeri in September top out at 19°C (66°F) and drop to 11°C (52°F) overnight. A light jacket or extra layer can be useful, especially outside the warmest hours of the day. At 11°C (52°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 Sommeri in September

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

If you prefer dry days with pleasant temperatures, June, July and August typically offer the best circumstances. If you're seeking pleasant, dry and sunny weather somewhere else in the world, our weather planner can help you explore other options.

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 Sommeri's climate page.

Sommeri Temperature in September

Min Temperature 11°C (52°F)  

Max Temperature 19°C (66°F)  

Chance of Rain 42%  

Precipitation 127 mm (5 in)  

Rainy days 13 days  

Humidity 78% *  

Sunshine 155 hours *  

Percentage Sunshine 44% *  

* Data from: St. Gallen, Switzerland (17 KM, 10 Miles).

What to Wear in Sommeri in September

For Sommeri 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. Bring sunglasses since you'll have some sunny periods throughout the month

What To Do in Sommeri 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 Sommeri's climate page.

More climate data for Sommeri

Temperature Rainfall Sunshine Humidity

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