Postojna, where it's located

The climate of Postojna is moderately continental, with cold winters and warm summers.
The city is located in the Karst hills, at 530 meters (1,700 feet) above sea level, and 30 km (18 mi) north-east of Trieste.
The average temperature of the coldest month (January) is of -0.1 °C (32 °F), that of the warmest month (July) is of 19 °C (66 °F). Here are the average temperatures.
Postojna - Average temperatures
Min (°C)-4-3037111212962-2
Max (°C)46101419232625201594
Min (°F)252732374552545448433628
Max (°F)394350576673797768594839

Precipitation amounts to 1,500 millimeters (59.1 inches) per year: so, it is quite abundant. It ranges from 80 mm (3.1 in) in the driest month (February) to 165 mm (6.5 in) in the wettest (October). Here is the average precipitation.
Postojna - Average precipitation

On average, there are around 2,080 sunshine hours per year. Here are the average sunshine hours per day.
Postojna - Sunshine


Best Time

The best time to visit Postojna runs from mid-May to mid-September, since it is the warmest and sunniest period of the year. Sometimes, it can be hot in July and August, while in other circumstances, nights can be cool or even a little cold even in these months, so it can be useful to bring a sweatshirt or sweater and a light jacket for the evening.