Koper weather in September (Slovenia)

What does the weather outlook for Koper look like in September? Thinking about a visit? Explore this page for a full overview of the weather conditions this month.

Temperatures

During September, Koper usually has high temperatures and high rainfall. Throughout the day, temperatures can rise to about 24°C. At night, they generally drop to 16°C.

Precipitation

Koper in September usually receives high rainfall, averaging around 159 mm for the month. Rain is expected on roughly 11 days.

Average sunshine

Expect sunny days throughout the month, with an estimated 223 hours of sunshine. Making it a pleasant time to visit Koper.

In case you lean more towards enjoying temperate temperatures and rain-free days June, July and August typically offer the most optimal weather. In contrast, January, February and December tend to have less optimal conditions.

For an in-depth look at the yearly conditions, visit our specialized Koper climate page with graphs.

 

Koper, monthly averages in September

Min Temperature 16°C  

Max Temperature 24°C  

Chance of Rain 37%  

Precipitation 159 mm  

Rainy days 11 days  

Humidity 57% *  

Sunshine 223 hours *  

Percentage Sunshine *  

* Data from: Portorož, Slovenia (11 KM, 7 Miles).

Where to go in Slovenia in September

Find out more about the weather in Slovenia and which places have the best travel conditions in this month.

Weather conditions Weather

Temperatures

Precipitation

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Legend perfect weather pleasant tolerable unpleasant poor

Perfect weather is subjective. On this map perfect weather has been defined with temperatures between 20°C and 29°C and not too much precipitation (less than 90 mm a month).

So, what should you wear in this month?

For visitors traveling to Koper, we recommend wearing layers. So maybe a skirt, t-shirt, shorts for during the day and jeans and a warm jacket for some days and evenings. Bring a rain jacket in case it rains during your stay. Plan on layering your clothes.

What To Do

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

Swimming

8/10

Camping

6/10

Interested in more climate information?

This site provides you with all the information you need about the climate in Koper.

Our site offers climate and forecast data for every country in the world. Are you going to Slovenia? On this website you can find historical weather averages for many cities in Slovenia. Not sure yet where to go? We now have a tool which recommends destinations that suit your ideal travel conditions. Find out where to go with our weather planner.