Postojna weather in September (Notranjska, Slovenia)

How is the weather in Postojna in September? Wondering if it's the right time to visit? Browse this page for a comprehensive overview of the weather conditions for that month.

In September, Postojna typically experiences pleasant temperatures and heavy rainfall. Daytime temperatures hover around 21°C, while nights can cool down to about 11°C.

Postojna in September falls under the rainy season with heavy rainfall, averaging around 181 mm for the month. This month marks the year's heaviest rainfall, with frequent intense rainshowers. It's advisable to be prepared with appropriate rain gear to stay dry. Rain is expected on roughly 13 days.

The days are predominantly sunny, with an estimated total of around 211 hours of sunshine. This amount of sunlight does not only brightens the days but also contributes to a cheerful ambiance in the area during this month.

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 TemperatureMin Temperature 11°C  
Max TemperatureMax Temperature 21°C  
Chance of RainChance of Rain 43%  
PrecipitationPrecipitation 181 mm  
Rainy daysRainy days 13 days  
HumidityHumidity 67% *  
SunshineSunshine 211 hours *  
Percentage SunshinePercentage 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 in September and which places have the best weather conditions in this month.

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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 Postojna in September?

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 in September.

Swimming
7/10
Camping
6/10

Interested in more climate information?

Weather and Climate 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 climate conditions. Find out where to go with our weather planner.