Portoroz, where it's located

The climate of Portoroz can be described as transitional Mediterranean.
Portorož (or Portorose) is located in the short coastal stretch of Slovenian, about 20 km (12 mi) south-west of Trieste. The sea mitigates the climate, but we are in the area where the bora can blow, the cold, dry wind from the eastern European plains.
The average temperature of the coldest month (January) is of 4.6 °C (40 °F), that of the warmest month (July) is of 22.5 °C (72 °F). Here are the average temperatures.
Portoroz - Average temperatures
Min (°C)103711141616131051
Max (°C)91013172226282824191310
Min (°F)343237455257616155504134
Max (°F)485055637279828275665550

Precipitation amounts to 930 millimeters (36.6 inches) per year: so, it is at an intermediate level. It ranges from 45 mm (1.8 in) in the driest month (February) to 125 mm (4.9 in) in the wettest (September). Here is the average precipitation.
Portoroz - Average precipitation

On average, there are around 2,390 sunshine hours per year. Here are the average sunshine hours per day.
Portoroz - Sunshine

The sea temperature ranges between 11 °C (52 °F) and 25 °C (77 °F). The sea is warm enough for swimming from July to September. Here are the average sea temperatures.
Portoroz - Sea temperature
Temp (°C)121111131822242523191614
Temp (°F)545252556472757773666157


Best Time

The best periods to visit Portoroz are spring and autumn, and in particular, from mid-April to mid-June and in the month of September. However, in both periods, some rainy days are possible.
The best months to go to the beach are July and August. In June, the sea is still a little cool.