Postojna Weather & Climate: Best Time to Visit
Average temperatures, rainfall, sunshine and the best time to visit Postojna.
Climate overview of Postojna
Postojna, in Slovenia's Inner Carniola region, experiences significant temperature changes throughout the year. Warm summers transition to cold winters, while the area receives high precipitation levels including substantial snowfall during winter months in this continental climate. In Postojna you can explore the famous underground cave system. Let's explore the climate details to provide you with a complete overview on when to visit.
Postojna Weather by Month
Pick a month to see the average temperature, rainfall and sunshine in Postojna - and find the best time to visit.
Monthly Temperature in Postojna
In Postojna, temperatures differ significantly between summer and winter months. On average, daytime temperatures range from a comfortable 26°C (79°F) in July to a chilly 5°C (41°F) in January.
Nighttime temperatures range from 15°C (59°F) in July to -2°C (28°F) in January.
Check out our detailed temperature page for more information.
Temperature ranges by month
Rainfall in Postojna
Postojna experiences significant rain/snowfall throughout the year, averaging 1651 mm (65 in) of precipitation annually. The amount of precipitation varies moderately throughout the year. The wettest month, September, sees around 181 mm (7.1 in) of rainfall, perfect for those who enjoy a bit of rain now and then. The driest month, January, still receives a respectable 89 mm (3.5 in) of snow/rainfall. For more details, please visit our Postojna Precipitation page.
The mean monthly precipitation over the year, including rain, hail, and snow
The average number of days each month with precipitation
Sunshine Hours in Postojna
In Postojna, summer days are longer and more sunny, with daily sunshine hours peaking at 9.7 hours in July. As the darker season arrives, the brightness of the sun becomes less. December sees a soft sun for only 2.8 hours per average day.
Visit our detailed sunshine hours page for more information.
Monthly hours of sunshine
Daily hours of sunshine
Daily percentage of sunshine
Humidity in Postojna by Month
The relative humidity is high throughout the year in Postojna.
The city experiences its highest humidity in October, reaching 69%. In March, the humidity drops to its lowest level at 61%. What does this mean? Read our detailed page on humidity levels for further details.
Relative humidity over the year
Best Time to Visit Postojna
Monthly ratings reflect general weather comfort, based on daytime temperature and rainfall. Swimming and winter conditions are highlighted separately where relevant.
- Best overall: May, June, July and August
- Warmest weather: July and August
- Most sunshine: July
- Seasonal pattern: A distinct rainy season from September to November, with warm summers and cold winters
- Coldest conditions: January, with freezing nights around -2°C (28°F).
Frequently asked questions about the climate in Postojna
What is the best time to visit Postojna?
May, June, July and August typically offer the most optimal weather in Postojna. In contrast, January, February, March, November and December tend to have less optimal conditions. Postojna has a distinct rainy season from September to November, with warm summers and cold winters.
What temperatures can I expect in Postojna?
Daytime highs range from 5°C (41°F) in January to 26°C (79°F) in July. Nighttime lows range from -2°C (28°F) to 15°C (59°F). Temperatures vary considerably through the year.
How much rain does Postojna get?
Annual rainfall is around 1651 mm (65 in). September is the wettest month with 181 mm (7.1 in), while January is the driest with 89 mm (3.5 in).
How sunny is Postojna?
Postojna receives around 2,117 hours of sunshine per year. July is the sunniest month with 290 hours, while December is the cloudiest with just 84 hours. Overall, Postojna enjoys abundant sunshine.
Postojna 3-Day Forecast
Postojna on the map
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