Postojna weather in September (Notranjska, Slovenia)

How's the weather trend in Postojna as September approaches? Find out what kind of weather to expect during this month.

Temperatures

In September, the weather in Postojna generally includes pleasant temperatures and heavy rainfall. Daytime temperatures hover around 21°C, while nights can cool down to about 11°C.

Precipitation

Postojna in September falls under the rainy season with heavy rainfall, averaging around 181 mm for the month. With the year's heaviest rain occurring this month, it's best to be equipped with a poncho to handle the frequent downpours. Rain is expected on roughly 13 days.

Average sunshine

The city usually sees around 211 hours of sunlight, indicating many sunny days.

If you prefer dry days with pleasant temperatures, May, June, July and August typically offer the best circumstances. While January, February, March, November and December tend to showcase less optimal conditions.

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

 

Postojna, monthly averages in September

Min Temperature 11°C  

Max Temperature 21°C  

Chance of Rain 43%  

Precipitation 181 mm  

Rainy days 13 days  

Humidity 67% *  

Sunshine 211 hours *  

Percentage Sunshine 54% *  

Data from: Triest, Italy (38 KM, 23 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 Postojna, 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

7/10

Camping

6/10

Interested in more climate information?

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

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.